FEPC Updates on the Japanese Nuclear Crisis, through April 19, 2011

8/7/2019 FEPC Updates on the Japanese Nuclear Crisis, through April 19, 2011

http://slidepdf.com/reader/full/fepc-updates-on-the-japanese-nuclear-crisis-through-april-19-2011 1/45

Update to Information Sheet Regarding the Tohoku Earthquake

The Federation of Electric Power Companies of Japan (FEPC) Washington DC Office

As of 10:00AM (EST), April 19, 2011

• Radiation Levelso On April 19, TEPCO announced the results of the analysis of groundwater samples

from sub-drain pits at Unit 1 to 6 of Fukushima Daiichi Nuclear Power Station. The

concentration of radioactive nuclides were as follows:

Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6

Samples

taken at4/18

10:20AM 4/18

10:30AM 4/18

10:10AM 4/18

9:45AM 4/18

10:40AM 4/18

10:45AM

Nuclides(half-life)

Concentration (Unit : Bq/cm3)

I-131(8 days)

4.3 x 101

4.5 x 102

2.6 x 100

7.9 x 100

1.0 x 10-1

5.6 x 10-2

Cs-134

(2 years)1.1 x 10

15.8 x 10

02.2 x 10

08.6 x 10

-16.6 x 10

-27.8 x 10

-2

Cs-137

(30 years)1.2 x 10

16.7 x 10

02.3 x 10

09.2 x 10

-17.1 x 10

-27.6 x 10

-2

o The concentration of radioactive nuclides from the seawater sampled at the screen

device (installed to remove waste before the intake of seawater) of Unit 2 and samplednear the seawater discharge point (south side) of Fukushima Daiichi Nuclear Station

were as follows:

Nuclides(half-life)

Concentration (Unit : Bq/cm3) Ratio

Sampled

inside the

silt fence at

the screen of

Unit 2

Sampled

outside the

silt fence at

the screen

of Unit 2

Sampled at

south side

discharge

point

Maximum

Permissible

Water

Concentration

(d)

a / d b / d c / d

4/18

7:30AM

(a)

4/18

7:25AM

(b)

4/18

2:00PM

(c)

I-131

(8 days)2.6 x 10

26.0 x 10

18.1 x 10

-24.0 x 10

-26,500 1,500 2.0

Cs-134

(2 years)7.0 x 10

11.8 x 10

12.1 x 10

-16.0 x 10

-21,200 300 3.5

Cs-137(30 years)

7.2 x 101

1.8 x 101

2.2 x 10-1

9.0 x 10-2

800 200 2.4

o At 5:00PM (JST) on April 19, radiation level at main gate (approximately 3,281 feet

from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 59 micro

Sv/hour.

o At 5:00PM on April 19, radiation level at west gate (approximately 3,609 feet from Unit

2 reactor building) of Fukushima Daiichi Nuclear Power Station: 28.0 micro Sv/hour.



o Measurement results of environmental radioactivity level around Fukushima Nuclear

Power Station announced at 4:00PM on April 19 are shown in the attached PDF file.

English version is available at:http://www.mext.go.jp/english/radioactivity_level/detail/1304082.htm

o For comparison, a human receives 2,400 micro Sv per year from natural radiation in the

form of sunlight, radon, and other sources. One chest CT scan generates 6,900 micro Sv

per scan.

• Plant Parameters


pressure inside the

reactor core (gauge

pressure, MPa)

0.430 -0.020 -0.040 - 0.007 0.010

4/19

12:00PM

4/19

12:00PM

4/19

12:00PM-

4/19

1:00PM

4/19

1:00PM

pressure inside the primary containment

vessel (absolute

pressure, MPaabs)

0.165 0.085 0.1036 - - -

4/19

12:00PM

4/19

12:00PM

4/19

12:00PM

- - -

water level inside the

reactor core (meter)*1

-1.6 -1.5 -1.85 - +2.222 +2.033

4/19

12:00PM

4/19

12:00PM

4/19

12:00PM-

4/19

1:00PM

4/19

1:00PM

temperature of the

reactor vesselmeasured at the water

supply nozzle

(degrees Fahrenheit)

334.0 277.7 214.0 - - -

4/19

12:00PM

4/19

6:00AM

4/19

12:00PM- - -

temperature of the

spent fuel pool(degrees Fahrenheit)

- 120.2 - - 99.0 77.0

-4/19

12:00PM- -

4/19

1:00PM

4/19

1:00PM

the temperature

directly above the

spent fuel pool bythermography

measurement


59.0 - 131.0 68.0 - -

4/18

7:30AM-

4/18

7:30AM

4/18

7:30AM- -

temperature directly

above the primarycontainment vessel

by thermographymeasurement(degrees Fahrenheit)

69.8 - 87.8 - - -

4/18

7:30AM-

4/18

7:30AM- - -

temperature directlyabove the second

containment building

by thermographymeasurement

- 68.0 - - - -

-4/18

7:30AM - - - -




Amount of water in

total shot/injected tothe spent fuel storage

pool (tons)

90 511 - 526 5,293 2,136 - -

as of 4/19

5:00PM

as of 4/19

5:00PM

as of 4/19

5:00PM

as of 4/19

5:00PM- -

*1: A negative figure indicates that the water level is below the top of the fuel rods.

• Fukushima Daiichi Unit 1 reactor o As of 3:00PM on April 19, injection of nitrogen gas into the primary containment vessel

to prevent an explosion by accumulated hydrogen gas continues.

o As of 3:00PM on April 19, the injection of freshwater into the reactor core continues.

• Fukushima Daiichi Unit 2 reactor

o At 10:08AM on April 19, transferring of the accumulated water at the turbine buildingto the Central Radioactive Waste Disposal Facility commenced. TEPCO plans to

transfer approximately 10,000m3

out of 25,000 m3

of accumulated water (approximately

480m

3

per day).o As of 3:00PM on April 19, the injection of freshwater into the reactor core continues.

o At 4:08PM on April 19, TEPCO began to inject freshwater into the spent fuel pool,

until 5:28PM (approximately 47 tons in total).

• Fukushima Daiichi Unit 3 reactor o As of 3:00PM on April 19, the injection of freshwater into the reactor core continues.


o At 10:17AM on April 19, TEPCO began to shoot freshwater aimed at the spent fuel

pool, with a specialized vehicle normally used for pumping concrete, until 11:35AM(approximately 40 tons in total).

• Fukushima Daiichi Unit 6 reactor o

At 11:00AM on April 19, transferring of the accumulated water at the turbine buildingto the condenser commenced, until 3:00PM.

• Fukushima Daiichi Common Spent Fuel Pool

o As of 7:30AM on April 19, the temperature of the spent fuel pool: 89.6 degrees

Fahrenheit.

Our official sources are:

• Office of The Prime Minister of Japan

• Nuclear and Industrial Safety Agency (NISA)

• Tokyo Electric Power Company (TEPCO) Press Releases

• Ministry of Education, Culture, Sports, Science and Technology (MEXT)

• Ministry of Defense (MOD)






• Roadmap

o On April 17, TEPCO announced “the Roadmap towards Restoration from the Accident

at Fukushima Daiichi Nuclear Power Station.” This will be sent by another email and is

also available at:http://www.tepco.co.jp/en/press/corp-com/release/11041707-e.html





Samples

taken at4/16

10:18AM 4/16

10:15AM 4/16

9:55AM 4/16

9:50AM 4/16

10:27AM 4/16

10:30AM

Nuclides

(half-life)Concentration (Unit : Bq/cm

3)

I-131

(8 days)8.4 x 10

15.4 x 10

24.7 x 10

01.3 x 10

12.0 x 10

-12.1 x 10

-1

Cs-134

(2 years)1.5 x 10

15.8 x 10

04.3 x 10

02.7 x 10

03.4 x 10

-13.5 x 10

-1

Cs-137(30 years)

1.9 x 101

7.1 x 100

4.5 x 100

2.7 x 100

3.7 x 10-1

3.9 x 10-1


device (installed to remove waste before the intake of seawater) of Unit 2 and sampled

near the seawater discharge point (south side) of Fukushima Daiichi Nuclear Station

were as follows:

Nuclides

(half-life)


Sampled

inside the

silt fence at

the screen of

Unit 2

Sampled

outside the

silt fence at

the screen

of Unit 2

Sampled at

south side

discharge

point

Maximum

Permissible

Water

Concentration

(d)

a / d b / d c / d

4/177:45AM

(a)

4/177:40AM

(b)

4/172:00PM

(c)

I-131

(8 days)2.1 x 10

21.9 x 10

21.4 x 10

-14.0 x 10

-25,300 4,800 3.5

Cs-134

(2 years)9.7 x 10

14.2 x 10

13.5 x 10

-16.0 x 10

-21,600 700 5.8

Cs-137

(30 years)1.0 x 10

24.4 x 10

13.6 x 10

-19.0 x 10

-21,100 490 4.0



o On April 17, TEPCO announced the result of the analysis of water samples from the

skimmer surge tank (installed to receive the overflowed water and floating wastes) of the spent fuel pool at Unit 2 of Fukushima Daiichi Nuclear Power Plant taken on April

16. The concentration of radioactive nuclides were as follows: Nuclides

(half-life)


Sampled on April 16(Reference) Sampled from the

spent fuel pool on February 10

I-131

(8 days)4.1 x 10

32.8 x 10

-1

Cs-134

(2 years)1.6 x 10

5Under the Detection Limit

Cs-136

(13 days)4.0 x 10

3N/A

Cs-137(30 years)

1.5 x 105

Under the Detection Limit



Sv/hour.




Power Station announced at 4:00PM on April 18 are shown in the attached PDF file.English version is available at:

http://www.mext.go.jp/english/radioactivity_level/detail/1304082.htm


form of sunlight, radon, and other sources. One chest CT scan generates 6,900 micro Sv per scan.



pressure inside the

reactor core (gauge pressure, MPa)

0.428 -0.023 -0.034 - 0.007 0.01

4/18

12:00PM

4/18

1:00PM

4/18

1:45PM-

4/18

2:00PM

4/18

2:00PM

pressure inside the

primary containment

vessel (absolute pressure, MPaabs)

0.170 0.085 0.1047 - - -

4/181:00PM

4/181:00PM

4/181:45PM

- - -

water level inside thereactor core (meter)

*1

-1.65 -1.5 -1.8 - +1.852 +2.018

4/18

12:00PM

4/18

1:00PM

4/18

1:45PM-

4/18

2:00PM

4/18

2:00PM

temperature of the

reactor vessel 338.4 285.4 214.7 - - -





o At 2:17PM on April 18, TEPCO began to shoot freshwater aimed at the spent fuel pool,

with a specialized vehicle normally used for pumping concrete, until 3:02PM

(approximately 30 tons in total).




with a specialized vehicle normally used for pumping concrete, until 9:22PM(approximately 140 tons in total).

• Fukushima Daiichi Common Spent Fuel Poolo At 2:34PM on April 17, the power supply to the spent fuel pool was temporarily

interrupted due to an electrical short circuit.

o At 5:30PM on April 17, the power supply to the spent fuel pool was restored after the

removal of the cable and checkups.

o As of 4:30AM on April 18, the temperature of the spent fuel pool: 91.4 degreesFahrenheit.

• Others

o At 9:00AM on April 15, TEPCO began to install silt barrier containing zeolite (an

absorbent of radioactive nuclides) between the screen pump rooms of Unit 1 and 2 and between the screen pump rooms of Unit 2 and 3, until 11:15AM.

o At 10:19AM on April 15, TEPCO began to transfer distribution panels of the pumps to

inject water to the reactors of Units 1 to 3 to higher ground as a countermeasure againsttsunami, until 5:00PM.

o At 2:30PM on April 15, TEPCO began to install silt barrier containing zeolite between

the screen pump rooms of the Unit 3 and Unit 4.

o At 9:00AM on April 16, the removal works of debris at the site began, with a remote

controlled excavation machine, until 4:00PM.


















Samples

taken at4/13

11:40AM 4/13

11:50AM 4/13

11:25AM 4/13

11:20AM 4/13

12:00PM 4/13

12:10PM

Nuclides(half-life)


I-131(8 days)

4.0 x 102

6.1 x 102

3.6 x 100

1.7 x 101

1.6 x 10-1

1.9 x 10-1

Cs-134

(2 years)5.3 x 10

17.9 x 10

02.4 x 10

02.7 x 10

02.7 x 10

-12.6 x 10

-1

Cs-137

(30 years)6.0 x 10

19.1 x 10

02.4 x 10

02.7 x 10

02.8 x 10

-12.8 x 10

-1

o On April 15, TEPCO announced the result of discharge of low level radioactive water

stored at the Central Radioactive Waste Disposal Facility and accumulated water at thesub-drain pits of Unit 5 and 6 to the ocean. The details are available at:

http://www.tepco.co.jp/en/press/corp-com/release/11041507-e.html

The total radioactive content of discharge: approximately 1.5 x 1011

Bq Discharge amount from the Central Radioactive Waste Disposal Facility:

approximately 9,070 tons (from 7:03PM on April 4 to 5:40PM on April 10)

Discharge amount from sub-drain pits of Unit 5 and 6: approximately 1,323 tons

(from 9:00PM on April 4 to 6:52PM on April 9) TEPCO has not detected major changes of the concentration of nuclides in the

seawater sampled at several measuring points near Fukushima Daiichi Nuclear

Power Station, compared with the samples that were taken during the week beforethe discharge.

(As reported on April 4, these discharges were performed in order to accommodate

higher level radioactive water in the Central Radioactive Waste Disposal Facilityand to prevent important equipment of Unit 5 and 6 from being submerged.)



near the seawater discharge point (south side) of Fukushima Daiichi Nuclear Stationwere as follows:

Nuclides(half-life)


Sampled at the

screen of Unit

2 at 7:40AM

Sampled at

south side

discharge point

Maximum

Permissible

Water

a / c b / c



on April 14 (a) at 2:00PM onApril 14 (b)

Concentration(c)

I-131(8 days)

4.2 x 101

1.2 x 100

4.0 x 10-2

1,100 30

Cs-134(2 years)

3.3 x 101

7.9 x 10-1

6.0 x 10-2

550 13

Cs-137(30 years)

3.3 x 101

8.1 x 10-1

9.0 x 10-2

370 9


from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 69 microSv/hour.



o Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on April 15 are shown in the attached PDF file.

English version is available at:

http://www.mext.go.jp/english/radioactivity_level/detail/1304082.htm o For comparison, a human receives 2,400 micro Sv per year from natural radiation in the


per scan.



pressure inside thereactor core (gauge

pressure, MPa)

0.430 -0.018 -0.021 - 0.003 0.009

4/15

12:00PM

4/15

12:00PM

4/15

12:00PM-

4/15

2:00PM

4/15

2:00PM

pressure inside the primary containmentvessel (absolute

pressure, MPaabs)

0.190 0.090 0.104 - - -

4/15

12:00PM

4/15

12:00PM

4/15

12:00PM- - -


reactor core (meter)

*1

-1.65 -1.5 -1.8 - +1.692 +2.230

4/15

12:00PM

4/15

12:00PM

4/15

12:00PM-

4/15

2:00PM

4/15

2:00PM

temperature of thereactor vessel

measured at the water

supply nozzle(degrees Fahrenheit)

385.5*2

298.8194.2

*2- - -

4/156:00AM

4/156:00AM

4/156:00AM

- - -

temperature of the

spent fuel pool


- 143.6 - - 95.4 77.0

-4/15

12:00PM- -

4/15

2:00PM

4/15

2:00PM

the temperature

directly above the 96.8 - 138.2 145.4 - -




measurement


4/14

7:40AM-

4/14

7:40AM

4/14

7:40AM- -


above the primary

containment vessel by thermography

measurement


91.4 - 154.4 - - -

4/14

7:40AM-

4/14

7:40AM- - -



by thermography

measurement(degrees Fahrenheit)

- 87.8 - - - -

-4/14

7:40AM - - - -

Amount of water in

total shot/injected tothe spent fuel storage

pool (tons)

90 419 - 434 5,263 1,816 - -

as of 4/15

5:00PM

as of 4/15

5:00PM

as of 4/15

5:00PM

as of 4/15

5:00PM- -

*1: A negative figure indicates that the water level is below the top of the fuel rods.

*2: This figure is under investigation.









with a specialized vehicle normally used for pumping concrete.


o At 6:20AM on April 15, the temperature of the spent fuel pool: 91.4 degrees Fahrenheit.

• Others

o At 2:15PM on April 15, TEPCO installed steel plates at the ocean side of the screen

device of Unit 2 in order to contain the spread of discharged radioactive water.











As of 12:00PM (EST), April 14, 2011

• Radiation Levelso On April 13, TEPCO announced the result of the analysis of water samples from the

spent fuel pool at Unit 4 of Fukushima Daiichi Nuclear Power Plant taken on April 12.

The concentration of radioactive nuclides were as follows: o TEPCO also announced the temperature of the pool water was approximately 194

degrees Fahrenheit when the samples were taken.

Nuclides(half-life)

Concentration (Unit : Bq/cm )

Sampled on April 12 Sampled on March 4

I-131

(8 days)2.2 x 10


Cs-134

(2 years)8.8 x 10


Cs-137

(30 years)9.3 x 10

11.3 x 10

-1

o The concentration of radioactive nuclides from the seawater sampled at the screendevice (installed to remove waste before the intake of seawater) of Unit 2 and sampled

near the seawater discharge point (south side) of Fukushima Daiichi Nuclear Station

were as follows:

Nuclides(half-life)


Sampled at the

screen of Unit2 at 8:25AM

on April 13 (a)

Sampled at

south sidedischarge point

at 2:00PM on

April 13 (b)

Maximum

PermissibleWater

Concentration

(c)

a / c b / c

I-131

(8 days)1.0 x 10

29.7 x 10

-14.0 x 10

-22,500 24

Cs-134(2 years)

5.5 x 101

1.4 x 100

6.0 x 10-2

920 23

Cs-137(30 years)

5.5 x 101

1.4 x 100

9.0 x 10-2

610 16



Sv/hour.








o For comparison, a human receives 2,400 micro Sv per year from natural radiation in theform of sunlight, radon, and other sources. One chest CT scan generates 6,900 micro Sv

per scan.

• Plant ParametersUnit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6

pressure inside the

reactor core (gauge pressure, MPa)

0.423 -0.016 -0.017 - 0.003 0.010

4/14

12:00PM

4/14

12:00PM

4/14

12:00PM-

4/14

8:00AM

4/14

8:00AM

pressure inside the

primary containment

vessel (absolute pressure, MPaabs)

0.190 0.090 0.1040 - - -

4/14

12:00PM

4/14

12:00PM

4/14

12:00PM- - -


reactor core (meter)*1

-1.6 -1.5 -1.8 - +1.842 +2.268

4/14

12:00PM

4/14

12:00PM

4/14

12:00PM-

4/14

8:00AM

4/14

8:00AM

temperature of the

reactor vesselmeasured at the water

supply nozzle


392.5*2

309.4193.8

*2- - -

4/14

12:00PM

4/14

12:00PM

4/14

12:00PM- - -

temperature of thespent fuel pool


- 159.8 - - 95.9 89.6

-4/14

12:00PM- -

4/14

1:00PM

4/14

1:00PM

the temperature

directly above the


measurement


96.8 - 138.2 145.4 - -

4/14

7:40AM-

4/14

7:40AM

4/14

7:40AM- -



by thermography


91.4 - 154.4 - - -

4/14

7:40AM-

4/14

7:40AM- - -





- 87.8 - - - -

-4/14

7:40AM - - - -



Amount of water intotal shot/injected to

the spent fuel storage

pool (tons)

90 419 - 434 5,263 1,816 - -

as of 4/14

5:00PM

as of 4/14

5:00PM

as of 4/14

5:00PM

as of 4/14

5:00PM- -

*1: Minus figure means that water level is below the top of the fuel rods.



o As of 6:00PM on April 14, injection of nitrogen gas into the primary containment vessel





• Fukushima Daiichi Unit 3 reactor o At 3:56PM on April 14, TEPCO began to shoot freshwater aimed at the spent fuel pool,


(approximately 25 tons in total).o As of 6:00PM on April 14, the injection of freshwater into the reactor core continues.



• Others



o At 12:10PM on April 14, TEPCO installed a double layered silt fence at the ocean side

of the screen device of Unit 1 and 2 and near the north side of south sea wall of

Fukushima Daiichi Nuclear Power Station in order to contain the spread of dischargedradioactive water.











• Radiation Levels




Nuclides

(half-life)


Sampled at the

screen of Unit2 at 1:50PM on

April 12 (a)

Sampled atsouth side

discharge point

at 2:00PM onApril 12 (b)

MaximumPermissible

Water

Concentration(c)

a / c b / c

I-131

(8 days)1.0 x 10

21.3 x 10

04.0 x 10

-22,500 33

Cs-134

(2 years)8.3 x 10

11.4 x 10

06.0 x 10

-21,400 23

Cs-137

(30 years)8.4 x 10

11.4 x 10

09.0 x 10

-2930 16










per scan.




pressure, MPa)

0.420 -0.016 -0.023 - 0.003 0.019

4/13

12:00PM

4/13

12:00PM

4/13

12:10PM-

4/13

1:00PM

4/13

1:00PM


vessel (absolute

pressure, MPaabs)

0.190 0.095 0.1036 - - -

4/13

12:00PM

4/13

12:00PM

4/13

12:10PM- - -




*1

-1.6 -1.5 -1.75 - +1.59 +2.365

4/13

12:00PM

4/13

12:00PM

4/13

12:10PM-

4/13

1:00PM

4/13

1:00PM

temperature of the

reactor vessel

measured at the water supply nozzle


400.1*2

332.4198.0

*2- - -

4/13

12:00PM

4/13

12:00PM

4/13

12:10PM- - -

temperature of the


- 113 - - 95.2 73.4

-4/13

12:00PM- -

4/13

1:00PM

4/13

1:00PM

the temperature

directly above the

spent fuel pool by

thermography


78.8 - 138.2 98.6 - -

4/12

7:50AM -

4/12

7:50AM

4/12

7:50AM - -


above the primarycontainment vessel by thermography

measurement


62.6 - 69.8 - - -

4/12

7:50AM-

4/12

7:50AM- - -




- 82.4 - - - -

- 4/127:50AM - - - -

Amount of water in

total shot/injected to


pool (tons)

90 359 - 374 5,238 1,816 - -

as of 4/13

5:00PM

as of 4/13

5:00PM

as of 4/13

5:00PM

as of 4/13

5:00PM- -




o As of 12:00PM on April 13, injection of nitrogen gas into the primary containment

vessel to prevent an explosion by accumulated hydrogen gas continues.


• Fukushima Daiichi Unit 2 reactor o At 7:35PM on April 12, transferring of the accumulated water at the trench (concrete

tunnel which houses pipes and cables) outside the turbine building to the condenser commenced.



o At 1:15PM on April 13, TEPCO began to inject freshwater into the spent fuel pool,

until 2:55PM.




• Fukushima Daiichi Unit 4 reactor o At 12:30AM on April 13, TEPCO began to shoot freshwater aimed at the spent fuel

pool, with a specialized vehicle normally used for pumping concrete, until 6:57PM


• Fukushima Daiichi Common Spent Fuel Poolo At 8:00AM on April 13, the temperature of the spent fuel pool: 84.2 degrees Fahrenheit.

• Others

o At 1:00PM on April 12 and at 10:00AM on April 13, TEPCO installed steel plates at

the ocean side of the screen device of Unit 2 in order to contain the spread of discharged

radioactive water.

o At 1:50PM on April 13, TEPCO installed a silt fence at the ocean side of the screen

device of Unit 3 and 4 in order to contain the spread of discharged radioactive water.










As of 2:00PM (EST), April 12, 2011





Nuclides

(half-life)


Sampled at the


on April 11 (a)


discharge point


MaximumPermissible

Water

Concentration(c)

a / c b / c

I-131

(8 days)1.4 x 10

29.5 x 10

-14.0 x 10

-23,500 24

Cs-134

(2 years)1.2 x 10

21.3 x 10

06.0 x 10

-22,000 22

Cs-137

(30 years)1.2 x 10

21.3 x 10

09.0 x 10

-21,300 14






Power Station announced at 10:00AM on April 12 are shown in the attached PDF file.




per scan.




pressure, MPa)

0.416 -0.023 -0.017 - 0.006 0.01

4/12

6:00AM

4/12

6:00AM

4/12

12:00PM-

4/12

1:00PM

4/12

1:00PM


vessel (absolute

pressure, MPaabs)

0.195 0.09 0.1048 - - -

4/12

6:00AM

4/12

6:00AM

4/12

12:00PM- - -




*1

-1.65 -1.5 -1.85 - +1.752 +2.368

4/12

6:00AM

4/12

6:00AM

4/12

12:00PM-

4/12

1:00PM

4/12

1:00PM

temperature of the

reactor vessel

measured at the water supply nozzle


421.2*2

330.4221.7

*2- - -

4/12

6:00AM

4/12

6:00AM

4/12

6:00AM- - -

temperature of the


- 114.8 - - 96.4 89.6

-4/12

6:00AM- -

4/12

1:00PM

4/12

1:00PM

the temperature

directly above the

spent fuel pool by

thermography


78.8 - 138.2 98.6 - -

4/12

7:50AM -

4/12

7:50AM

4/12

7:50AM - -


above the primarycontainment vessel by thermography

measurement


62.6 - 69.8 - - -

4/12

7:50AM-

4/12

7:50AM- - -




- 82.4 - - - -

- 4/127:50AM - - - -

Amount of water in



pool (tons)

90 359 - 374 5,203 1,621 - -

as of 4/12

5:00PM

as of 4/12

5:00PM

as of 4/12

5:00PM

as of 4/12

5:00PM- -




o As of 7:00PM on April 12, injection of nitrogen gas into the primary containment vessel





with a specialized vehicle normally used for pumping concrete, until 5:16PM.




• Fukushima Daiichi Unit 4 reactor o At 12:00PM on April 12, TEPCO began to take water samples from the spent fuel pool

in order to analyze radioactive nuclides to judge the condition of spent fuel assemblies

stored in the pool, until 1:04PM.


• Otherso At 6:38AM on April 12, a fire was detected at the sampling building of Unit 1-4 (for

sampling and researching the seawater) located at the ocean-side discharge canal.

o At 9:12AM on April 12, a local fire department confirmed that the fire has beenextinguished.

<INES Rating>

• On April 12, Japanese Safety Authority (NISA: Nuclear and Industrial Safety Agency)announced that the Rating of the International Nuclear and Radiological Event Scale (INES) on

the events in Fukushima Daiichi has been raised to Level 7.

o On March 18, NISA assessed the events in Fukushima Daiichi at the INES Level 5,considering information obtained before March 18.

o Based on the analysis of the status of reactors by the Japan Nuclear Energy Safety

Organization (JNES), NISA estimated the total amount of discharged radioactivematerials from the reactors of Fukushima Daiichi to the air. This estimation resulted inthe value corresponding to Level 7 of INES rating*, as listed in the following table.* The value representing radiation impact, which is converted to the amount equivalent to I-131, exceeds

several tens of thousands of tera-becquerel (of the order of magnitude as 1016 Bq).

o Although Level 7 is the highest level of INES rating, it is estimated that the amount of discharged radioactive materials to the environment at present is approximately 10

percent of the amount by the Chernobyl accident of 1986.

Assumed amount of the discharge from

Fukushima Daiichi

(Reference)

Amount of thedischarge from the

Chernobyl

AccidentEstimated by NISA

Announced by

Nuclear SafetyCommission(*)

I-131

(a)1.3 x 10

17Bq 1.5 x 10

17Bq 1.8 x 10

18Bq

Cs-1376.1 x 10

15Bq 1.2 x 10

16Bq 8.5 x 10

16Bq

(Converted

value to I-131)(b)

2.4 x 1017

Bq 4.8 x 1017

Bq 3.4 x 1018

Bq

(a) + (b) 3.7 x 1017

Bq 6.3 x 1017

Bq 5.2 x 1018

Bq



(Notes) The conversion of the values to be equivalent to radiation impact of I-131 regarding the NISA’s

estimation and the Nuclear Safety Commission’s announcement were carried out by NISA in

accordance with the INES User’s Manual.

<Effects of the aftershock which occurred at 2:07PM on April 12>

• Fukushima Daiichi Nuclear Power Station

o As of 3:30PM on April 12, pumping of freshwater into the reactor core for Unit 1, 2 and

3 continues.

o As of 3:00PM on April 12, no significant changes have been detected at monitoring posts at the site.

• Fukushima Daini Nuclear Power Station (Unit 1, 2, 3 & 4)

o Plant operation was suspended at all units when the aftershock occurred.

o As of 3:30PM on April 12, no significant changes have been detected at monitoring posts at the site and external power supply was maintained.

• Onagawa Nuclear Power Station (Unit 1,2 & 3)


o As of 3:30PM on April 12, no significant changes have been detected at monitoring

posts at the site and external power supply and cooling systems were maintained.• Tokai Daini Nuclear Power Station

o Plant operation was suspended when the aftershock occurred.


posts at the site and external power supply and cooling systems were maintained.















Nuclides

(half-life)


Sampled at the


on April 10 (a)


discharge point


MaximumPermissible

Water

Concentration(c)

a / c b / c

I-131

(8 days)2.0 x 10

24.5 x 10

04.0 x 10

-25,000 110

Cs-134

(2 years)1.6 x 10

23.6 x 10

06.0 x 10

-22,700 60

Cs-137

(30 years)1.6 x 10

23.7 x 10

09.0 x 10

-21,800 41

o At 9:00AM (JST) on April 11, radiation level at main gate (approximately 3,281 feet


o At 9:00AM on April 11, radiation level at west gate (approximately 3,609 feet from

Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 45.2 microSv/hour.


Power Station announced at 4:00PM on April 11 are shown in the attached PDF file.English version is available at:






pressure inside the

reactor core (gauge

pressure, MPa)

0.416 -0.020 -0.017 - 0.006 0.018

4/11

12:00PM

4/11

12:00PM

4/11

12:00PM-

4/11

1:00PM

4/11

1:00PM

pressure inside the

primary containment

vessel (absolute

0.195 0.095 0.1043 - - -

4/11

12:00PM

4/11

12:00PM

4/11

12:00PM- - -



pressure, MPaabs)


reactor core (meter)

*1

-1.6 -1.5 -1.9 - +1.909 +2.489

4/11

12:00PM

4/11

12:00PM

4/11

12:00PM-

4/11

1:00PM

4/11

1:00PM

temperature of thereactor vesselmeasured at the water

supply nozzle


433.2*2

308.5 207.9*2

- - -

4/11

6:00AM

4/11

6:00AM

4/11

6:00AM- - -

temperature of thespent fuel pool


- 159.8 - - 97.3 73.4

-4/11

12:00PM- -

4/11

1:00PM

4/11

1:00PM

the temperature

directly above thespent fuel pool by

thermography

measurement


60.8 - 132.8 89.6 - -

4/10

7:30AM-

4/10

7:30AM

4/10

7:30AM- -



by thermography


66.2 - 73.4 - - -

4/10

7:30AM-

4/10

7:30AM- - -





- 77 - - - -

-4/10

7:30AM - - - -

Amount of water in


the spent fuel storage pool (tons)

90 359 - 374 5,203 1,621 - -

as of 4/11

10:30AM

as of 4/11

10:30AM

as of 4/11

10:30AM

as of 4/11

10:30AM- -

*1: Minus figure means that water level is below the top of the fuel rods.*2: This figure is under investigation.




• Fukushima Daiichi Unit 2 reactor o At 10:37AM on April 10, TEPCO began to inject freshwater into the spent fuel pool,

until 12:38PM (approximately 60 tons in total).






with a specialized vehicle normally used for pumping concrete, until 7:15PM(approximately 80 tons in total).






• Others

o At 12:14PM on April 8, discharge of approximately 950 tons of low level radioactive

water which had accumulated at the sub-drain pits of Unit 5 has completed.

o At 6:52PM on April 9, discharge of approximately 373 tons of low level radioactivewater which had accumulated at the sub-drain pits of Unit 6 has completed.


controlled excavation machine, until 5:00PM.o At 8:45AM on April 11, TEPCO began to install a double layered silt fence of

approximately 120m (=394 feet) near the south sea wall of Fukushima Daiichi Nuclear

Power Station in order to contain the spread of discharged radioactive water, until10:45AM.

<Influences of the aftershock occurred at 5:16PM on April 11>

• Fukushima Daiichi Nuclear Power Station

o At 5:40PM on April 11, Unit 1 and 2 lost the external power supply and pumping of

freshwater into the reactor core was suspended.

o At 5:56PM on April 11, the external power supply was recovered at Unit 1 and 2.

o At 5:59PM on April 11, pumping of freshwater into the reactor core was suspended for Unit 3.

o At 6:04PM on April 11, pumping of freshwater into the reactor core for Unit 1, 2 and 3

was resumed.


posts at the site.

o As of 6:05PM on April 11, no abnormality has been reported in the temperature, pressure, or water levels in the reactor cores.

• Fukushima Daini Nuclear Power Station (Unit 1, 2, 3 & 4)



posts at the site and external power supply was maintained.

• Onagawa Nuclear Power Station (Unit 1,2 & 3)


o As of 5:45PM on April 11, no significant changes have been detected at monitoring posts at the site and external power supply and cooling systems were maintained.

• Higashidori Nuclear Power Station

o Plant was under periodical maintenance when the aftershock occurred.



o As of 6:54PM on April 11, external power supply and cooling systems were

maintained.

• Tokai Daini Nuclear Power Stationo Plant operation was suspended when the aftershock occurred.

o As of 5:30PM on April 11, external power supply and cooling systems were

maintained.













device (installed to remove waste before the intake of seawater) of Unit 2 of Fukushima

Daiichi Nuclear Station was as follows:The details of this report are available at:

http://www.tepco.co.jp/en/press/corp-com/release/11040506-e.html

Nuclides

(half-life)

Concentration (Unit : Bq/cm )

Sampled at

11:50AM on

April 2

Sampled at

6:25PM on

April 3

Sampled at

9:00AM on

April 4

Maximum

Permissible Water

Concentration

I-131

(8 days) 3.0 x 105

7.9 x 104

2.0 x 105

4.0 x 10-2

Cs-134

(2 years)1.2 x 10

53.5 x 10

49.6 x 10

46.0 x 10

-2

Cs-137(30 years)

1.2 x 105

3.6 x 104

9.6 x 104

9.0 x 10-2

o At 6:00PM on April 5, radiation level at main gate (approximately 3,281 feet from Unit

2 reactor building) of Fukushima Daiichi Nuclear Power Station: 112 micro Sv/hour.

o At 6:00PM on April 5, radiation level at west gate (approximately 3,609 feet from Unit2 reactor building) of Fukushima Daiichi Nuclear Power Station: 67.4 micro Sv/hour.







o At 6:00AM on April 5, pressure inside the reactor core: 0.308MPa.

o At 6:00AM on April 5, water level inside the reactor core: 1.7 meters below the top of the fuel rods.

o At 6:00AM on April 5, pressure inside the primary containment vessel: 0.15MPaabs.

o At 6:00AM on April 5, the temperature of the reactor vessel measured at the water supply nozzle: 452.3 degrees Fahrenheit.

o At 7:20AM on April 5, the temperature directly above the spent fuel pool by

thermography measurement: 64.4 degrees Fahrenheit.

o At 7:20AM on April 5, the temperature directly above the primary containment vessel by thermography measurement: 78.8 degrees Fahrenheit.




o As of 7:00PM on April 5, preparation to recover and transfer the accumulated water at

the turbine building continues.

• Fukushima Daiichi Unit 2 reactor o At 6:00AM on April 5, pressure inside the reactor core: -0.018MPa.

o At 6:00AM on April 5, water level inside the reactor core: 1.5 meters below the top of

the fuel rods.

o At 6:00AM on April 5, pressure inside the primary containment vessel: 0.10MPaabs.o At 6:00AM on April 5, the temperature of the reactor vessel measured at the water

supply nozzle: 287.1 degrees Fahrenheit.


o At 7:20AM on April 5, the temperature directly above the second containment building

by thermography measurement: 82.4 degrees Fahrenheit.

o At 2:15PM on April 5, TEPCO announced that the tracer (white colored dye) wasobserved entering the ocean through a crack on the lateral surface of the pit (a vertical

portion of an underground structure for housing electric cables) near the seawater

intake.

o At 3:07PM on April 5, TEPCO began injecting coagulator into the soil around the pit in

an attempt to stop the discharge of water.o As of 7:00PM on April 5, the injection of freshwater into the reactor core continues.

o As of 7:00PM on April 5, preparation to recover and transfer the accumulated water atthe turbine building continues.


o At 7:20AM on April 5, the temperature directly above the spent fuel pool by

thermography measurement: 132.8 degrees Fahrenheit.

o At 7:20AM on April 5, the temperature directly above the primary containment vessel

by thermography measurement: 64.4 degrees Fahrenheit.


o At 10:20AM on April 5, water level inside the reactor core: 1.85 meters below the top

of the fuel rods.o At 10:20AM on April 5, pressure inside the primary containment vessel:

0.1071MPaabs.

o At 10:20AM on April 5, the temperature of the reactor vessel measured at the water

supply nozzle: 184.5 degrees Fahrenheit. (This figure is under investigation.)

o As of 1:30PM on April 5, approximately 4,978 tons of water in total has been shot intothe spent fuel storage pool.




o At 7:20AM on April 5, the temperature directly above the spent fuel pool bythermography measurement: 122 degrees Fahrenheit.


with a specialized vehicle normally used for pumping concrete, until 6:22PM.

• Fukushima Daiichi Unit 5 reactor o At 1:00PM on April 5, the temperature of the spent fuel pool: 94.6 degrees Fahrenheit.


o At 1:00PM on April 5, the temperature of the spent fuel pool: 81.5 degrees Fahrenheit.
















o The level of concentration of radioactive nuclide I-131 (2.5 x 101 Bq/cm3) from the

seawater sampled near the seawater discharge point of Fukushima Daiichi Nuclear

Station at 1:50PM (JST) on April 3 was approximately 625 times higher than themaximum permissible water concentration (4.0 x 10

-2Bq/cm

3) set by the government.

o On April 4, TEPCO announced that it will discharge 10,000 tons of low level

radioactive water stored at the Central Radioactive Waste Disposal Facility in order toaccommodate higher level radioactive water. It will also discharge 1,500 tons of low

level radioactive water which had accumulated at the sub-drain pits of Unit 5 and 6 in

order to prevent important equipment of Unit 5 and 6 from being submerged. The

original TEPCO press release is attached and also available at:http://www.tepco.co.jp/en/press/corp-com/release/11040404-e.html

(At 9:30PM on April 4, NHK reported the discharge of water from the CentralRadioactive Waste Facility has commenced around 7:00PM and from the sub-drain pitsat 9:00PM.)

o At 6:00PM on April 4, radiation level at main gate (approximately 3,281 feet from Unit

2 reactor building) of Fukushima Daiichi Nuclear Power Station: 118 micro Sv/hour.







per scan.

• Fukushima Daiichi Unit 1 reactor o On April 2, lighting was restored at the part of the turbine building.

o At 7:20AM on April 4, the temperature of the spent fuel pool by thermography

measurement: 64.4 degrees Fahrenheit.



of the fuel rods.


o At 11:00AM on April 4, the temperature of the reactor vessel measured at the water supply nozzle: 469.0 degrees Fahrenheit.






o On April 2, monitoring cameras were set at the trench outside the turbine building and

at the basement floor of the turbine building to monitor the water levels.

o At 9:30AM on April 2, the accumulated water was found in the pit (a vertical portion of an underground structure for housing electric cables) near the seawater intake and the

radiation level of the water was over 1,000 milli Sv/hour. In addition, the water was

observed entering the ocean from a crack (about 20cm = 7.9 inches) on the lateral

surface of the pit.o At 4:25PM on April 2, concrete was injected into the pit in an attempt to stop the

discharging of water. (injected again at 7:02PM)

o At 1:47PM on April 3, polymer absorber, sawdust, and shredded newspapers were

inserted in the pit in an attempt to stop the overflow of the discharge of water, until

2:30PM.

o At 7:08AM on April 4, tracer (white colored bath agent) was inserted into the trenchoutside the turbine building to determine the route of the water leakage.

o At 11:00AM on April 4, pressure inside the reactor core: -0.018MPa.


o At 11:00AM on April 4, pressure inside the primary containment vessel: 0.10MPaabs.o At 11:00AM on April 4, the temperature of the reactor vessel measured at the water


o At 11:00AM on April 4, the temperature of the spent fuel pool: 122 degrees Fahrenheit.




o At 9:52PM on April 2, TEPCO began to shoot freshwater aimed at the spent fuel pool,with a specialized vehicle normally used for pumping concrete, until 12:54PM

(approximately 75 tons in total).o At 7:20AM on April 4, the temperature of the spent fuel pool by thermography

measurement: 134.6 degrees Fahrenheit.




o At 9:30AM on April 4, the temperature of the reactor vessel measured at the water supply nozzle: 194 degrees Fahrenheit. (This figure is under investigation.)



with a specialized vehicle normally used for pumping concrete.o As of 7:00PM on April 4, preparation to recover and transfer the accumulated water at




o On April 2, lighting was restored at the part of the turbine building.






o At 7:20AM on April 4, the temperature of the spent fuel pool by thermography

measurement: 86 degrees Fahrenheit.

o As of 7:00PM on April 4, approximately 1,473.2 tons of water in total has been shot

into the spent fuel storage pool.• Fukushima Daiichi Unit 5 reactor


• Fukushima Daiichi Unit 6 reactor o At 2:00PM on April 4, the temperature of the spent fuel pool: 70.7 degrees Fahrenheit.



• Others

o At 9:10AM on April 2, a US Military barge (No.2) carrying freshwater docked at thededicated port at Fukushima Daiichi Nuclear Power Station, towed by a vessel of the

Marine Self Defense Forces.

o At 10:20AM on April 2, transferring freshwater from the US Military barge (No.1) to afiltrate tank resumed, until 4:40PM.

o At 12:12PM on April 4, a US Military barge (No.2) carrying freshwater docked again at

the dedicated port at Fukushima Daiichi Nuclear Power Station, after refilling thefreshwater.












o On March 31, TEPCO announced that radioactive nuclides were detected from the

groundwater sampled around the turbine buildings of Fukushima Daiichi Nuclear

Station on March 30. The results of the analysis are as follows:

Nuclides(half-life)


Unit 1 Unit 2 Unit 3 Unit 5 Unit 6

I-131

(8 days)

4.3 x 102

8.0 x 101

2.2 x 101

1.6 x 100

2.0 x 101

I-132

(2 hours)

8.3 x 10 UDL 1.3 x 10 UDL 5.8 x 10-

Cs-134(2 years)

5.2 x 100

7.0 x 10-1

1.0 x 101

2.5 x 10-1

4.7 x 100

Cs-136(13 days)

3.9 x 10-1

6.5 x 10-2

9.4 x 10-1

2.7 x 10-2

3.9 x 10-1

Cs-137(30 years)

5.9 x 10 6.3 x 10-

1.0 x 10 2.7 x 10-

4.9 x 10

UDL: under the detection limit











per scan.




of the fuel rods.


o At 10:00AM on April 1, the temperature of the reactor vessel measured at the water







o As of 7:00PM on April 1, approximately 90 tons of water in total has been injected into

the spent fuel storage pool.

• Fukushima Daiichi Unit 2 reactor o At 10:00AM on April 1, the temperature of the spent fuel pool: 122 degrees Fahrenheit.

o At 10:00AM on April 1, pressure inside the reactor core: -0.007MPa.


the fuel rods.o At 10:00AM on April 1, pressure inside the primary containment vessel: 0.11MPaabs.




o At 4:30PM on March 31, TEPCO began to shoot freshwater aimed at the spent fuel

pool, with a specialized vehicle normally used for pumping concrete, until 7:33PM(approximately 105 tons in total).



the fuel rods.o At 11:45AM on April 1, pressure inside the primary containment vessel:

0.1068MPaabs.






o At 8:28AM on April 1, TEPCO began to shoot freshwater aimed at the spent fuel pool,


(approximately 180 tons in total).o As of 7:00PM on April 1, approximately 1,278 tons of water in total has been shot into








• Others

o At 3:42PM on March 31, a US Military barge carrying freshwater docked at the

dedicated port at Fukushima Daiichi Nuclear Power Station, towed by a vessel of Marine Self Defense Forces.

o At 3:00PM on April 1, anti-scattering agent was dispersed on a trial basis around the

Fukushima Daiichi Common Spent Fuel Pool.

o At 3:58PM on April 1, transferring the freshwater from the US Military barge to a

filtrate tank commenced.





As of 11:00AM (EST), March 31, 2011


o At 8:51AM (JST) on March 31, it was announced that radioactive nuclide I-131 was

detected from the seawater sampled near the seawater discharge point (south side) of

Fukushima Daiichi Nuclear Station at 1:55PM on March 30. The level of concentrationwas approximately 4,385 times higher than the maximum permissible water

concentration set by the government.

o At 2:00PM on March 31, radiation level at main gate (approximately 3,281 feet fromUnit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 157 micro

Sv/hour.

o At 2:00PM on March 31, radiation level at west gate (approximately 3,609 feet from


o Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on March 31 are shown in the attached PDF file.English version is available at:



per scan.

• Fukushima Daiichi Unit 1 reactor o At 8:00AM on March 31, pressure inside the reactor core: 0.329MPa.

o At 8:00AM on March 31, water level inside the reactor core: 1.65 meters below the top

of the fuel rods.

o At 8:00AM on March 31, pressure inside the primary containment vessel: 0.21MPaabs.o At 8:00AM on March 31, the temperature of the reactor vessel measured at the water

supply nozzle: 480.9 degrees Fahrenheit

o At 9:20AM on March 31, transferring of the accumulated water at the trench (concrete

tunnel which houses pipes and cables) outside the turbine building commenced, until11:25AM. As a result, the water level at the trench was reduced from 0.14 meters to

1.14 meters below the top of the trench.

o At 1:03PM on March 31, TEPCO began to shoot freshwater aimed at the spent fuel pool, with a specialized vehicle normally used for pumping concrete.

o As of 3:00PM on March 31, the injection of freshwater into the reactor core continues.

o As of 3:00PM on March 31, preparation to recover and transfer the accumulated water

at the turbine building continues.• Fukushima Daiichi Unit 2 reactor

o As of 3:00PM on March 29, the water level at the trench was 1.04 meters below the top

of the trench.

o At 8:00AM on March 31, the temperature of the spent fuel pool: 131 degrees

Fahrenheit.

o At 8:00AM on March 31, pressure inside the reactor core: -0.016MPa.



o At 8:00AM on March 31, water level inside the reactor core: 1.5 meters below the top

of the fuel rods.

o At 8:00AM on March 31, pressure inside the primary containment vessel: 0.11MPaabs.


o As of 3:00PM on March 31, approximately 96 tons of water in total has been injected

into the spent fuel storage pool.

o As of 3:00PM on March 31, preparation to recover and transfer the accumulated water at the turbine building continues.

• Fukushima Daiichi Unit 3 reactor o As of 3:00PM on March 29, the water level at the trench was 1.55 meters below the top

of the trench.

o At 9:40AM on March 31, pressure inside the reactor core: 0.016MPa.

o At 9:40AM on March 31, water level inside the reactor core: 1.85 meters below the topof the fuel rods.

o At 9:40AM on March 31, pressure inside the primary containment vessel:

0.1066MPaabs.


o As of 3:00PM on March 31, approximately 4,697 tons of water in total has been shot tothe spent fuel storage pool.

o As of 3:00PM on March 31, preparation to recover and transfer the accumulated water at the turbine building continues.


o As of 3:00PM on March 31, approximately 1,098 tons of water in total has been shot to



o At 11:00AM on March 31, the temperature of the spent fuel pool: 86 degrees

Fahrenheit.

• Fukushima Daiichi Unit 6 reactor o At 11:00AM on March 31, the temperature of the spent fuel pool: 78.8 degrees

Fahrenheit.


o At 8:20AM on March 30, the temperature of the spent fuel pool: 89.6 degreesFahrenheit.


to the spent fuel storage pool.












o On March 30, it was announced that radioactive nuclide I-131 was detected from the

seawater sampled near the seawater discharge point of Fukushima Daiichi Nuclear

Station at 1:55PM on March 29. The level of concentration was approximately 3,355times higher than the maximum permissible water concentration set by the government.

o At 6:30PM on March 30, radiation level at main gate (approximately 3,281 feet from

Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 159 microSv/hour.


Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 106.3 micro

Sv/hour.


Power Station announced at 7:00PM on March 30 are shown in the attached PDF file.English version is available at:http://www.mext.go.jp/english/radioactivity_level/detail/1304082.htm




o At 7:30AM on March 29, transferring the water found at the turbine building to the

condenser was suspended because the water level of the condenser became almost full.(Correction of the previous day’s report that stated as of 3:00PM on March 29,

transferring the water found at the turbine building to the condenser continues.)

o At 1:00PM on March 30, pressure inside the reactor core: 0.34MPa.o At 1:00PM on March 30, water level inside the reactor core: 1.6 meters below the top of

the fuel rods.

o At 1:00PM on March 30, pressure inside the primary containment vessel: 0.23MPaabs.

o At 1:00PM on March 30, the temperature of the reactor vessel measured at the water supply nozzle: 518.2 degrees Fahrenheit


• Fukushima Daiichi Unit 2 reactor o At 4:45PM on March 29, preparation work to recover and transfer the water found at

the turbine commenced.

o At 1:00PM on March 30, the temperature of the spent fuel pool: 118.4 degrees

Fahrenheit.o At 1:00PM on March 30, pressure inside the reactor core: -0.023MPa.

o At 1:00PM on March 30, water level inside the reactor core: 1.5 meters below the top of

the fuel rods.



o As of 7:00PM on March 30, approximately 96 tons of water in total has been injectedinto the spent fuel storage pool.




o At 1:30PM on March 30, pressure inside the reactor core: 0.018MPa.

o At 1:30PM on March 30, water level inside the reactor core: 1.85 meters below the topof the fuel rods.

o At 1:30PM on March 30, pressure inside the primary containment vessel:

0.1064MPaabs.

o As of 4:00PM on March 30, the injection of freshwater into the reactor core continues.o As of 7:00PM on March 30, approximately 4,697 tons of water in total has been shot to


• Fukushima Daiichi Unit 4 reactor o At 2:04PM on March 30, TEPCO began to shoot water aimed at the spent fuel pool,

with a specialized vehicle normally used for pumping concrete.

o As of 7:00PM on March 30, approximately 960 tons of water in total has been shot to




Fahrenheit.

• Fukushima Daiichi Unit 6 reactor o At 2:00PM on March 30, the temperature of the spent fuel pool: 79.7 degrees

Fahrenheit.

• Fukushima Daiichi Common Spent Fuel Poolo At 8:30AM on March 29, the temperature of the spent fuel pool: 89.6 degrees

Fahrenheit.














o At 11:45PM (JST) on March 28, TEPCO announced that plutonium 238, 239 and 240

were detected in the soil sampled on March 21st and 22nd at five spots in Fukushima

Daiichi Nuclear Power Station. Concentration of detected plutonium 238, 239 and 240are the same level of the fallout observed in Japan at the atmospheric nuclear tests in the

past and poses no major impact on human health.

o At 6:30PM on March 29, radiation level at main gate (approximately 3,281 feet fromUnit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 177 micro

Sv/hour.



o Measurement results of environmental radioactivity level around Fukushima Nuclear Power Station announced at 7:00PM on March 29 are shown in the attached PDF file.English version is available at:



per scan.

• Fukushima Daiichi Unit 1 reactor o At 1:00PM on March 29, pressure inside the reactor core: 0.371MPa.

o At 1:00PM on March 29, water level inside the reactor core: 1.65 meters below the top

of the fuel rods.

o At 1:00PM on March 29, pressure inside the primary containment vessel: 0.265MPaabs.o At 1:00PM on March 29, the temperature of the reactor vessel measured at the water

supply nozzle: 570.9 degrees Fahrenheit

o As of 3:00PM on March 29, transferring the water found at the turbine building to the

condenser continues.



Fahrenheit.

o At 1:00PM on March 29, pressure inside the reactor core: -0.025MPa.


the fuel rods.o At 1:00PM on March 29, pressure inside the primary containment vessel: 0.1MPaabs.








of the fuel rods.

o At 12:00PM on March 29, pressure inside the primary containment vessel:0.1075MPaabs.

o At 2:17PM on March 29, TEPCO began to shoot freshwater aimed at the spent fuel

pool, with a specialized vehicle normally used for pumping concrete, until 6:18PM

(approximately 100 tons in total).o As of 4:00PM on March 29, the injection of freshwater into the reactor core continues.



o At 11:50AM on March 29, lighting was restored in the Central Control Room.

o As of 7:00PM on March 29, approximately 960 tons of water in total has been shot tothe spent fuel storage pool.



Fahrenheit.


Fahrenheit.


o At 3:10PM on March 28, the temperature of the spent fuel pool: 95 degrees Fahrenheit.












As of 12:30PM (EST), March 28, 2011


o At 6:00PM (JST) on March 28, radiation level at main gate (approximately 3,281 feet


Sv/hour.


Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 121.6 micro

Sv/hour.

o As of 7:00PM on March 28, the results of the radioactive nuclides detected from the

sample of waterhole at the turbine building of each unit of Fukushima Daiichi are as

follows:

Unit 1 Unit 2 Unit 3 Unit 4

Date of Samples

taken

March 26 March 26 March 26 March 26

Radiation Level on

the Surface

60 milli

Sv/hour

more than

1,000 milliSv/hour

750 milli

Sv/hour

0.50 milli

Sv/hour

Nuclides (half-life) Concentration (Unit : Bq/cm3)

I-131 (8 days) 1.5 x 105

1.3 x 107

3.2 x 105

3.6 x 102

I-132 (2 hours) UDL UDL UDL 1.3 x 101

I-134 (53 minutes) UDL UDL UDL UDL

Cs-134 (2 years) 1.2 x 105

2.3 x 105

5.5 x 104

3.1 x 101

Cs-136 (13 days) 1.1 x 10

4

2.5 x 10

5

6.5 x 10

3

3.7 x 10

0

Cs-137 (30 years) 1.3 x 10 2.3 x 10 5.6 x 10 3.2 x 10

UDL: under the detection limit


Power Station announced at 7:00PM on March 28 are shown in the attached PDF file.




per scan.


o At 2:30PM on March 26, it was announced that radioactive nuclide I-131 was detected

from the sampling of seawater near the seawater discharge point The level of

concentration was approximately 1,850 times higher than the maximum permissiblewater concentration set by the government and it was approximately 1.5 times higher

than the previous day’s figure.

o As of 3:10PM on March 27, recovery and transfer work of the waterhole at the turbine building to the condenser by using three pumps was underway.



o At 3:30PM on March 27, it was announced that 0.4milli (400,000 micro) Sv/hour was

detected on the surface of the waterhole at the trench (concrete tunnel in which the

pipes are laid down) outside turbine building.



of the fuel rods.

o At 12:30PM on March 28, pressure inside the primary containment vessel:0.270MPaabs.

• Fukushima Daiichi Unit 2 reactor o At 10:10AM on March26, injection of freshwater in place of seawater into the reactor

core started.

o At 4:46PM on March 26, lighting was restored in the Central Control Room.

o As of 7:30AM on March 27, transfer work of the waterhole at the turbine building tothe condenser was under preparation.

o At 3:30PM on March 27, it was announced that more than 1,000 milli (1,000,000

micro) Sv/hour was detected on the surface of the waterhole at the trench outside

turbine building.

o At 12:30PM on March 28, the temperature of the spent fuel pool: 121.1 degreesFahrenheit.



of the fuel rods.





• Fukushima Daiichi Unit 3 reactor o As of 7:30AM on March 27, transfer work of the waterhole at the turbine building to

the condenser was under consideration.o At 12:34PM on March 27, TEPCO began to shoot water aimed at the spent fuel pool,



o At 3:30PM on March 27, it was announced that the waterhole was found at the trench

outside turbine building, but TEPCO couldn’t measure the radiation level on the surfacedue to rubbles.


o At 10:30AM on March 28, water level inside the reactor core: 1.85 meters below thetop of the fuel rods.


0.1076MPaabs.o As of 7:00PM on March 28, approximately 4,597 tons of water in total has been shot to







o As of 7:30AM on March 27, transfer work of the waterhole at the turbine building to

the condenser was under consideration.


o As of 7:00PM on March 28, external power generation is connected and the

functionality of the electric devices is being checked.


Fahrenheit.


Fahrenheit.

• Fukushima Daiichi Common Spent Fuel Poolo At 8:00AM on March 27, the temperature of the spent fuel pool: 102.2 degrees

Fahrenheit.















from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 199.5 micro

Sv/hour.






per scan.


o At 11:00AM on March 25, activities for the injection of freshwater in place of seawater

into the reactor core started and at 3:37PM, the injection of freshwater into the reactor

core started.



of the fuel rods.



o At 10:00AM on March 25, the temperature of the spent fuel pool: 82.4 degrees

Fahrenheit.

o At 10:30AM on March25, TEPCO began to inject seawater into the spent fuel pool

via cooling and purification line, until at 12:19PM (approximately 38 tons in total).

o At 11:00AM on March 25, activities for the injection of freshwater in place of seawater into the reactor core started.


o At 2:00PM on March 25, water level inside the reactor core: 1.4 meters below the top of the fuel rods.






o As of 7:30PM on March 25, the injection of seawater into the reactor core continues.

• Fukushima Daiichi Unit 3 reactor o At 11:00AM on March 25, activities for the injection of freshwater in place of seawater

into the reactor core started and at 6:02PM, the injection of freshwater into the reactor

core started.



o At 1:28PM on March 25, Kawasaki City Fire Department began to shoot water aimed at

the spent fuel pool until 4:00PM (approximately 450 tons in total).


o At 2:00PM on March 25, pressure inside the primary containment vessel:

0.1089MPaabs.


the fuel rods.o As of 7:00PM on March 25, approximately 4,497 tons of water in total has been shot to


• Fukushima Daiichi Unit 4 reactor o At 6:05AM on March25, TEPCO began to inject seawater into the spent fuel pool via

cooling and purification line, until at 10:20APM.

o At 7:05PM on March 25, TEPCO began to shoot water aimed at the spent fuel pool,with a specialized vehicle normally used for pumping concrete.

o As of 7:00PM on March 25, approximately 685 tons of water in total has been shot to



functionality of the electric devices is being checked.• Fukushima Daiichi Unit 5 reactor


Fahrenheit.

o At 3:00PM on March 25, the temperature of the water in the reactor core: 129.0 degrees

Fahrenheit.


Fahrenheit.

• Fukushima Daiichi Common Spent Fuel Poolo As of 7:00PM on March 25, approximately 130 tons of water in total has been injected














from Unit 2 reactor building) of Fukushima Daiichi Nuclear Power Station: 204.5 micro

Sv/hour.






per scan.


o At 10:50AM on March 24, hazy white steam was emitted from the top of the second

containment building.

o At 11:30AM on March 24, lighting was restored in the Central Control Room.



the fuel rods.



• Fukushima Daiichi Unit 2 reactor o At 1:00PM on March 24, pressure inside the reactor core: -0.023MPa.


of the fuel rods.


o At 1:00PM on March 24, the temperature of the spent fuel pool: 113 degrees

Fahrenheit.






o At 11:30PM on March 23, it was confirmed that the emission of black smoke had

ceased (confirmed again at 4:50AM on March 24).

o At 5:35AM on March 24, TEPCO began to inject seawater into the spent fuel pool viacooling and purification line, until at 4:05PM (approximately 120 tons in total).


o At 10:20AM on March 24, water level inside the reactor core: 1.9 meters below the topof the fuel rods.


0.107MPaabs.



o At 2:25PM on March 24, the radiation level near the power panel of the 1st

basement

floor of turbine building was measured as 200 milli Sv per hour.










Fahrenheit.

o At 1:00PM on March 24, the temperature of the water in the reactor core: 197.6 degrees

Fahrenheit.• Fukushima Daiichi Unit 6 reactor


Fahrenheit.


o At 3:37PM on March 24, the external power started to be supplied.



o As of 6:05PM on March 24, cooling of the spent fuel pool began.


Fahrenheit.






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FEPC Updates on the Japanese Nuclear Crisis, through April 19, 2011

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