Tefzel Washer Service Bulletin ANA-002 - us.areva … Tefzel Sealing... · requirements of IEEE...

Meggitt Safety Systems Service Bulletin ANA-002

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SERVICE BULLETIN

Containment Atmosphere Monitoring System, CAMS

Part Number A23502 for 116A139 Pump Rebuild Kits

Revision A Dec 02, 2009

Meggitt Safety Systems Service Bulletin ANA-002 Revision A Dec 02, 2009

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ANALYZER MODEL: CAMS SB NO: ANA-002

SYSTEM: 116A140 Pump Motor Assemblies DATE: Nov. 25, 2009 SUBJECT: Recommended Replacement Seal for 116A139 Rebuild Kits Diaphragm

Cap Screw 1. PLANNING INFORMATION A. EFFECTIVITY:

This Service Bulletin applies to Meggitt Safety Systems Inc (MSSI) 116A139 series pump rebuild kits for 116A140 series pump motor assemblies. Per section 4.14.1 of document P-9484, 116A140 Pump Rebuild Assembly Maintenance Procedure, rebuild kits utilize RTV 3110 to create a seal at the interface between the diaphragm cap screw and diaphragm plate. The purpose of this service bulletin is to introduce tefzel washer A23502 as an acceptable replacement for RTV 3110 when applied as a seal at the diaphragm cap screw and diaphragm plate interface.

B. REASON:

Tefzel washer A23502 offers a more practical solution to pump maintenance than RTV 3110. The pieces are small and easy to store, they can be purchased in individual units as spares, there is no pre-installation preparation necessary (such as curing), material certification is provided per lot and doesn’t require additional analysis, and the shelf life considerably exceeds that of RTV 3110. The culmination of these benefits results in enhancing maintenance efficiency and process planning.

C. PARTS DISPOSITION RTV 3110 and associated catalyst are currently listed in Section 3.0

Materials of document P-9484, 116A140 Pump Rebuild Assembly Maintenance Procedure. The replacement item, tefzel washer A23502 is reflected on drawing 116A139 Rev. R and later, item 21 of the parts list with installation instructions per Note 5.

D. PARTS COMPARISON:

Tefzel washer A23502 was subjected to a complete 1E qualification program, as described in part E, for the same service conditions and environments as RTV 3110 in 116A140 pump motor assembly applications.

E. QUALIFICATION

Tefzel washer A23502 is qualified for service in 1E applications per the parameters described in ER 11209. The qualified service conditions are summarized in Tables 1 and 2.

Meggitt Safety Systems Service Bulletin ANA-002 Revision A Dec 02, 2009

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Table 1: Normal Service Conditions

Operating Time Continuous Temperature 120°F Relative Humidity 90% Pressure Atmospheric Radiation 4x104 Rad

Table 2:Design Basis Accident Conditions

Operating Time Continuous Temperature 310°F Relative Humidity 100% Pressure 65 PSIA Radiation 40x106 Rad (Gamma)

Tefzel washer A23502 remained installed with the diaphragm cap screw and diaphragm plate throughout the qualification program. Normal service vibration significantly exceeds vibration from seismic activity; as a result seismic vibration was omitted from the qualification sequence. However, the tefzel washer has since undergone seismic vibration as part of a separate qualification program with no adverse effects, as expected. Figure 1 displays the temperature/pressure graph that was profiled for the LOCA test. The dashed lines demonstrate that +10% margin was added at the peaks to develop the test profile.

0

50

100

150

200

250

300

350

1 10 100 1000 10000 100000

Time/Seconds

Tem

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/F

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Figure 1 LOCA testing Temperature and Pressure Profile


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E. REPLACEMENT SCHEDULE The recommended replacement cycle follows the recommended

maintenance schedule, as described in the Operations and Maintenance Manual (3-5 years).

G. MATERIAL COST AND AVAILABILITY: Material cost does not affect pricing of the standard 116A139 series rebuild kit and units are readily available with material certification, not requiring additional material analysis.

L: OTHER PUBLICATIONS AFFECTED: Drawing 116A139 in the Operations and Maintenance Manual should be

replaced with Rev. R (or later) for reference to the A23502 tefzel washer replacement.


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Attachment 1

116A139 Pump Rebuild Kit

C:\Documents and Settings\fibarra\Local Settings\Temp\9AEE835B-0FF5-448E-95F9-11FB4913D79B\116A139.dwg

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A 72152

C:\Documents and Settings\fibarra\Local Settings\Temp\9AEE835B-0FF5-448E-95F9-11FB4913D79B\116A139.dwg

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A 72152


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Attachment 2

ER 11209

APPROVALS CONTROLLED DISTRIBUTION

PREPARED: F.Ibarra 081202

ENG: F.Ibarra 081202

Q.A.: S.Hernandez 081205

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CAGE CODE: 25693 ER 11209

MFG: N/A

CHECKED I.Campbell 081202

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ENGINEERING DEPARTMENT

DOCUMENT

ER 11209

TITLE

QUALIFICATION REPORT

FOR TEFZEL WASHER A23502

REF. MSSI DRAWING NO. 116A140

PROPRIETARY DATA THIS DATA SHALL NOT BE TRANSFERRED, RELEASED, DUPLICATED, USED OR DISCLOSED IN WHOLE OR IN PART FOR MANUFACTURE OR PROCUREMENT WITHOUT THE EXPRESS WRITTEN PERMISSION OF MEGGITT SAFETY SYSTEMS, INC. ALL RIGHTS RESERVED.

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CAGE CODE 25693 ER 11209

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TABLE OF CONTENTS

1.0 BACKGROUND.........................................................................................................................4

2.0 SCOPE......................................................................................................................................4

3.0 REFERENCE DOCUMENTS ....................................................................................................4

4.0 TEST SPECIMEN......................................................................................................................5

5.0 TEST CONDITIONS..................................................................................................................5

6.0 TEST RESULTS........................................................................................................................7

7.0 CONCLUSIONS ........................................................................................................................8

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1.0 BACKGROUND

The 116A140 pump motor assembly is qualified for use in a safety-related application for the

nuclear power industry. The safety function performed by the pump motor assembly is to

draw in sample gas for analysis by the MSSI 1E safety related containment atmosphere

monitoring system. For this application, the pump motor assembly is in contact with in-

containment atmosphere and will therefore be exposed to the steam, radiation and pressure

conditions (see table 5.1 and 5.2) predicted within containment post accident.

Although the pump motor assembly, as it is currently designed, satisfies the qualification

requirements for 1E safety related equipment, a change in sealing material from RTV to a

Tefzel washer (A23502) at the interface between diaphragm cap screw (A19507) and the

diaphragm plate (A16505) generated the need for qualification of the Tefzel material as

described herein. Both the RTV and Tefzel washer remain valid methods for sealing the cap

screw/diaphragm plate. The reason for introducing the Tefzel washer as an alternative sealing

material is for ease of assembling; setting RTV is a much longer process. For more details on

location, see the drawings in Appendix I.

2.0 SCOPE

The test program described by this report is to qualify the Tefzel washer for use in the MSSI

CAMS pump motor assembly 116A140. The safety function of the Tefzel washer is to

maintain the seal between the cap screw and diaphragm plate. Functional testing is limited to

the ability of the Tefzel washer to maintain an adequate pressure barrier throughout the

qualification program. Qualification will be by sequential testing in accordance with the

requirements of IEEE 323-2003

3.0 REFERENCE DOCUMENTS

3.1 IEEE 323-2003 Standard for Qualifying Class 1E Equipment for Nuclear Power Generating

Stations

3.2 STP-5004, Pneumatic Leak Test

3.3 STP-2189, Standard Helium Leak For Cable/Connector Assemblies

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4.0 TEST SPECIMEN

The test specimen was ADI Tefzel washer Part Number: A23502. The test bed for qualifying

the Tefzel washer was Air Dimensions Inc. Part number:19310NAAGG5, Serial Number:

96044165, Batch: 110707, PO: SAMPLE (see material certificate on Appendix A for more

details). Throughout testing all pump components creating a pressure boundary with the

Tefzel washer remained assembled for testing to best simulate service performance

conditions. The complete pump motor assembly (pump components with motor) was only

used for LOCA testing, as this was the only test its use required. For assembly detail see

Appendix F.

5.0 TEST CONDITIONS

The tables below outline the environmental conditions that the Tefzel washer is qualified for.

Table 5.1 Normal Service Conditions Operating Time Continuous Temperature 120°F Relative Humidity 90% Pressure Atmospheric Radiation 4x104 Rad

Table 5.2 Design Basis Accident Conditions

Operating Time Continuous Temperature 310°F Relative Humidity 100% Pressure 65 PSIA Radiation 40x106 Rad (Gamma)

The following is the testing sequence for qualification of the Tefzel washer.

1. Baseline functional test per STP-5004

2. Thermal Aging per IEEE 323-2003

3. Baseline functional test per STP-5004

4. Radiation testing per IEEE 323-2003

5. Baseline functional testing per STP-2189

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6. LOCA testing per IEEE 323-2003

7. Baseline functional testing per STP-2189

5.1 Baseline functional test before and after thermal aging per STP 5004 consisted of a

Pneumatic Leak test of the test unit under 110 psia Nitrogen. Once taken to 70 psia pressure

was slowly increased and stabilized at 110psia. The presence of bubbles while submerged

under water would have been an indicator of failure of either the Tefzel or the diaphragm.

Functional testing before and after both the radiation and LOCA test consisted of helium leak

testing per STP-2189.

5.2 Thermal aging was determined by using the Arrhenius equation and activation energy of

Tefzel (1.57eV) to calculate time and temperature to demonstrate 40 years of service. As

such, it was determined that the test condition would be at 100oC for 100 hours.

5.3 Radiation testing conducted at 40Mrad at a dose rate of 1-2Mrad/hr gamma radiation.

Following the radiation test, baseline functional test per STP-2189 Helium Leak Test was

performed to 1x10-8cc/s. No leaks were detected. Helium leak test was used rather than

bubble test to provide a higher sensitivity leak test focusing just on the Tefzel washer. All

components remained assembled throughout testing.

5.4 LOCA testing per Figure 1 below resulted in successful performance by the Tefzel washer as

indicated by successful maintenance of the test environment shown in the chart recording in

Appendix G and established by the helium leak test data sheet in Appendix H. See the LOCA

test set-up diagram below for set-up details.

Figure 1

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*All testing, with exception of the radiation exposure, was performed at MSSI.

Note that seismic testing is not included. Basis for this decision is:

• The Tefzel washer is firmly supported on both surfaces between the cap screw and

diaphragm plate, both previously qualified for seismic use.

• Mechanical stresses that would be exerted on the washer during a seismic event are

insignificant relative to the stresses induced by the pump during regular service.

6.0 TEST RESULTS

6.1 Functional Tests. Functional test results accumulated during the test program are

summarized in Table 6-1, Reference Appendix B.

Table 6-1 Functional Test Results (See Appendix B for Data Sheets)

Test Test Test Condition

Pass/Fail

Date

Base Line STP-5004 110 psi Pass 06/20/08 Post Thermal STP-5004 110 psi Pass 06/25/08 Post Radiation STP-2189 1x10-8cc/s Pass 09/10/08 Post LOCA STP-2189 1x10-8 cc/s Pass 10/30/08

6.2 LOCA Summary. The test equipment did not initially meet our stability expectations for

pressure and temperature. Consequently, a second test was run immediately following the

first; this run successful as indicated on the chart recording in Appendix G. Both runs are

shown in Appendix G, the first is not annotated. The second test is annotated and its starting

point begins at the annotation on page two of Appendix G. Essentially, the Tefzel washer

experienced two LOCA test and passed functional testing. Figure 2 shows the profile followed

for the test.

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0

50

100

150

200

250

300

350

1 10 100 1000 10000 100000

Time/Seconds

Tem

pera

ture

/F

-5

15

35

55

75

95

115

135

155

175

Pres

sure

/PSI

A

LOCA testing Temperature and Pressure Profile

Figure 2

7.0 CONCLUSIONS

Tefzel is a suitable material for the 116A140 pump motor assembly in applications described

in paragraph1.0. Testing confirmed that radiation, thermal aging and LOCA will not alter

performance of the Tefzel material.

The test program described herein confirms the changes incorporated into the pump-motor

assembly will not alter its qualification status.

Pump Rebuild Kit 116A139 Rev. T has been altered to include the Tefzel washer and is

indicated as such in Item 21 and Note 5 of the drawing.

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Appendix A

Material Certification

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Appendix B

Baseline Functional Test Results

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Appendix C

Thermal Aging Chart Recording

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Appendix D

Post Thermal Aging Functional

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Appendix E

Irradiation Certificate

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Appendix F Post Irradiation Functional Test

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Appendix G LOCA Chart Recording

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Appendix H

Post LOCA Functional Test

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Appendix I Drawings

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