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ACADs (08-006) Covered
KeywordsChemical and volume control system, normal letdown, charging, makeup water flow paths.
Description
Supporting Material
1.2.1.1 3.1.1.1 3.1.1.2 3.1.1.3 3.1.1.4 3.1.1.5 3.1.1.6 3.1.1.7
3.1.1.8 3.1.1.9 3.1.1.10 3.1.1.11 3.1.1.12 3.1.1.13 3.1.1.14 3.1.1.15
3.1.1.16 3.1.1.17 3.1.1.18 3.1.1.19 4.2.7.3 5.2.2.3 5.2.2.7
Chemical and Volume Control System (CVCS)
2
OBJECTIVES
5
1. List the functions of the Chemical & Volume Control System (CVCS).
2. State the function of each major component in the CVCS.
3. Describe the normal letdown, charging, and makeup water flow paths.
CVCS System
• Letdown System - removes water from the RCS for filtering, chemical adjustment, and radiation monitoring
• Charging System - returns water to the Reactor Coolant System (RCS) via the charging pumps from the Volume Control tank (VCT)
6
Functions of CVCS • Regulate RCS chemistry for reactivity and
corrosion control• Maintain pressurizer water level• Maintain seal water injection to Reactor
Coolant Pump (RCP) seals• Provides a means to fill, drain, and pressure
test the RCS• Provide injection to the RCS during
Emergency Core Cooling System (ECCS) initiation
7
CVCS components are made of austenitic stainless steel
8
TV130
ACCWLTDN
HX
BTRS381B
LTDNRHHX
128
RHR
8152 8160 15214
PRT
459 460
CLLP3
REGENHX
8149A 8149B 8149C
M
8146
M
8147
CLLP1
CLLP4
RCP 18141
M
BTRS
BORONSAMPLE
BTRS
600 # FC FC
FC
FC
FCFC
FC FC
FC
FO
129VCT
TIS129
TI130
PT131
300 #
131FO
HELBA
CIA-ACIA-B
IRCORC
8145PZR
81032
3
4FI
145
OTHERRCPS
FROMHEADVENT
PRT
CIA-A CIA-B
M M
8100
F
8112
8143
RCDT
123
809881538154
FROMRCSLP4
ACCW
HUT
EXCESSLTDN HX
112A
RCSFILTER
111B
BORON SAMPLE
8133
8115
8130
CATIONBED DEMIN
B A S T
RMWST
111ABLENDER
110A
188
505
8104
M
V C T
LI185
LI112
110BSI-A
SI-B
M
M
112B
112C
8471A
M
RWSTSI-A M
112D
112E
SI-BM
SI-A
CCP-A
8471B
M
SI-B
CCP-B
M
M
8509B
8508BSI-B
M M
RWST
RWST8509A
M
M8508ASI-A
SI-BM8111ASI-B
8111B
M SI-A
8110
8485A
S
190A 8116SI-A
M8438
S
M
8485B
190B
F F
PT121
SI-A
SI-B
M
M
8106
8105
SEALWATER
HXACCW
M
8109
M
RCP
BIT
121
NCP
BATP-A
BATP-B
150 #
104
106
CHARGING FLOW
LETDOWN FLOW
SEAL INJECTION FLOW
REACTOR MAKEUP
FC FCFC
FC
FC
IRCORC
IRC ORC
IRC ORC
M
182
SI-A&
SI-B
RE-48000
9
Chemical & Volume Control System
10
REGENERATIV EHx
LETDOWN Hx
8152 8160 15214
128
TV130
TV12
9
TV129
8115
BTRS381B
459 460
FC
FC
FCFCFC
FC FC FC
FC
FC
M
M
8146
8147
8145
8149C8149B8149A
M ix ed BedD eminer aliz er
M ix ed BedD eminer aliz er
Cation Bed
Demin
A CCW
BT RS F RO MCH A RGI N G
Cold L egL oop 3
Cold L egL oop 1
Cold L egL oop 4
PZ R
PRT
RH R
T o/ F r omBT RS
VCT
T OCH A RG I N G S U CT I O N
T o L W PS
RCSF i lt er
Letdown
Major Components
• Regenerative Heat Exchanger– transfers heat from letdown flow to
charging flow– reduces temperature of letdown prior
to orifices to prevent flashing of liquid to steam
– preheats charging to minimize thermal stress at RCS penetration
11
Regenerative Heat Exchanger
12
557°F
260°F
520520°°FF
100100°°FF
Letdown
ChargingTemperatures are
approximate
REGENERATIVE HEAT EXCHANGER
13
Regenerative Heat Exchanger
14
Major Components
• Letdown Orifices– reduce pressure and limit flow of RCS– two 75 gpm, one 45 gpm– combinations can be used to change
letdown flow
15
PRESSURE
PERMANENT PRESSURE
LOSS
Letdown Orifices
16
2235 psig
350 psig0 psig
Letdown Orifices (Isolation Valves)
17
Letdown Orifices
18
Letdown Orifices (Leak)
19
Major Components
• Letdown Heat Exchanger– Reduces RCS temperature prior to
entering mixed bed demineralizer– Cooled by Aux Component Cooling
Water (ACCW)– Reduces temperature to 115 F
20
Letdown Heat Exchanger
21
Major Components
• Demineralizers– maintain RCS purity– remove corrosion products– remove fission products– maximum flow rate of 120 gpm– operating temperature of ≈ 115 F
22
CONNECTION FOR LOADINGION EXCHANGE RESINS
UPPERRETENTION
SCREEN
CONNECTION FOR DISCHARGINGION EXCHANGE RESIN
BED OFION EXCHANGE
RESIN BEADS
ION EXCHANGEVESSEL
INFLUENT WATER(WATER TO BEPURIFIED)
EFFLUENT WATER(PURIFIED WATER)
LOWER RETENTIONSCREEN ELEMENT
Demineralizer
23
Major Components
• Volume Control Tank (VCT) – used to add hydrogen to RCS to
scavenge oxygen• minimizes corrosion of RCS
– used to degas reactor coolant– Net Positive Suction Head (NPSH) for
charging pumps– accepts makeup water to adjust RCS
boron concentration24
V C T
Letdown flow
Charging pump suction
Hydrogen
H2
N2
PC
PI
PC
PI
Waste Gas
Volume Control Tank (VCT)
25
Chemical & Volume Control System
26
Excess Letdow n
Seal W ater
Hx
Hx
FV121
FC
FC
FC
CCP B
NCP
CCP A
104
8149A
8149A
8149A
VCT
F r omL et down
1 0 6
T o/ F r omA CCW
T o/ F r omA CCW
F
F F
RCP
T o O t herRCPs
F r om O t herRCPs
F r omRCS L p4
F r omH ead Vent
REG ENERATIVEHx
FC
M
M
8146
8147
8145
Cold L e gL oop 1
Cold L e gL oop 4
PZ R
Charging
Major Components
• Centrifugal Charging Pumps (CCP)– Two, 11-stage CCPs– Auto start on SI signal– 150 gpm at 2800 psig– Powered from emergency 4160 VAC – Can be used for normal charging, but
not typically
27
Centrifugal Charging Pump
28
Major Components
• Normal Charging Pump (NCP)– One, 12-stage centrifugal pump– Normal source of charging flow– 130 gpm at 2543 psig– Not safety related - not required by
the Final Safety Analysis Report (FSAR)
29
NORMAL CHARGING PUMP
30
NORMAL CHARGING PUMP
31
Major Components
• Excess Letdown Heat Exchanger– Can supplement normal CVCS– Allows normal CVCS to be taken out of
service, but demineralizers are bypassed (temporary only)
– Can be routed to VCT, charging pump suction, or (Reactor Coolant Drain Tank) RCDT
– Cooled by ACCW
32
Excess Letdown Heat Exchanger
33
VCT
111A
BATP-B
BATP-A
111B
110A
F r omL et down
1 0 8
5 0 5
8 1 0 4
1 1 2 D
1 1 2 E
1 1 0 B
NCP
CCP B
CCP A
M
M
M
BLEN D ERBAST
F r omRW S T
F r omRM W S T
Chemical & Volume Control System
34
Makeup
Letdown / Charging Flow Path• Regenerative heat exchanger• Flow orifices• Letdown heat exchanger• Demineralizers• Volume control tank• Charging pumps• Regenerative heat exchanger
35
TV130
ACCWLTDN
HX
LV 459
LV460
CVCSLetdown CL Loop 3REGEN
HX
8149A 8149B 8149C
RCP 1
FC FC
FCFCFC
FOTI130
PT131
PV 131
FI132
IRCORC
FI145
Seal Injection to Other RCPS
HUTLV112A
V C T
SI-A
SI-B
M
M
112B
112C
FT121
SEALWATER
HXACCW
SIMPLIFIED CVCS SYSTEM
FV121
NCP CHARGING FLOW
LETDOWN FLOW
SEAL INJECTION FLOW
IRCORC
IRC
ORC
IRC ORC
HV182
FO
Total ChargingFlow – 87 gpm
SealInjectionFlow – 8 gpm
Charging Flow – 55 gpm(Total Charging Flow – TotalSeal Injection Flow)
TI127
Regen Hx Outlet Temp - 380°F
Letdown Pressure 360 - 380 psig
Letdown Flow – 75 gpm
Letdown Temperature - 115°F
Total Seal Injection Flow – 32 gpm
Charging FlowInto the RCS
Orifice IsolationValves
Seal Return From Other RCPS
Total Seal Return Flow – 12 gpm
TV130
ACCWLTDN
HX
LV 459
LV460
CVCSLetdown CL Loop 3REGEN
HX
8149A 8149B 8149C
RCP 1
FC FC
FCFCFC
FOTI130
PT131
PV 131
FI132
IRCORC
FI145
Seal Injection to Other RCPS
HUTLV112A
V C T
SI-A
SI-B
M
M
112B
112C
FT121
SEALWATER
HXACCW
SIMPLIFIED CVCS SYSTEM
FV121
NCP CHARGING FLOW
LETDOWN FLOW
SEAL INJECTION FLOW
IRCORC
IRC
ORC
IRC ORC
HV182
FO
Total ChargingFlow – 87 gpm
SealInjectionFlow – 8 gpm
Charging Flow – 55 gpm(Total Charging Flow – TotalSeal Injection Flow)
TI127
Regen Hx Outlet Temp - 380°F
Letdown Pressure 360 - 380 psig
Letdown Flow – 75 gpm
Letdown Temperature - 115°F
Total Seal Injection Flow – 32 gpm
Charging FlowInto the RCS
Orifice IsolationValves
Seal Return From Other RCPS
Total Seal Return Flow – 12 gpm
36
TV130
ACCWLTDN
HX
BTRS381B
LTDNRHHX
128
RHR
8152 8160 15214
PRT
459 460
CLLP3
REGENHX
8149A 8149B 8149C
M
8146
M
8147
CLLP1
CLLP4
RCP 18141
M
BTRS
BORONSAMPLE
BTRS
600 # FC FC
FC
FC
FCFC
FC FC
FC
FO
129VCT
TIS129
TI130
PT131
300 #
131FO
HELBA
CIA-ACIA-B
IRCORC
8145PZR
81032
3
4FI
145
OTHERRCPS
FROMHEADVENT
PRT
CIA-A CIA-B
M M
8100
F
8112
8143
RCDT
123
809881538154
FROMRCSLP4
ACCW
HUT
EXCESSLTDN HX
112A
RCSFILTER
111B
BORON SAMPLE
8133
8115
8130
CATIONBED DEMIN
B A S T
RMWST
111ABLENDER
110A
188
505
8104
M
V C T
LI185
LI112
110BSI-A
SI-B
M
M
112B
112C
8471A
M
RWSTSI-A M
112D
112E
SI-BM
SI-A
CCP-A
8471B
M
SI-B
CCP-B
M
M
8509B
8508BSI-B
M M
RWST
RWST8509A
M
M8508ASI-A
SI-BM8111ASI-B
8111B
M SI-A
8110
8485A
S
190A 8116SI-A
M8438
S
M
8485B
190B
F F
PT121
SI-A
SI-B
M
M
8106
8105
SEALWATER
HXACCW
M
8109
M
RCP
BIT
121
NCP
BATP-A
BATP-B
150 #
104
106
CHARGING FLOW
LETDOWN FLOW
SEAL INJECTION FLOW
REACTOR MAKEUP
FC FCFC
FC
FC
IRCORC
IRC ORC
IRC ORC
M
182
SI-A&
SI-B
RE-48000
37
Objectives Review
38
1. List the functions of the Chemical & Volume Control System (CVCS).
2. State the function of each major component in the CVCS.
3. Describe the normal letdown, charging, and makeup water flow paths.