ML20199A883
| ML20199A883 | |
| Person / Time | |
|---|---|
| Issue date: | 11/12/1997 |
| From: | Craig C NRC (Affiliation Not Assigned) |
| To: | Essig T NRC (Affiliation Not Assigned) |
| Shared Package | |
| ML20199A888 | List: |
| References | |
| NUDOCS 9711180139 | |
| Download: ML20199A883 (5) | |
Text
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UNITED STATES ff g
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NUCLEAR REGULATORY COMMISSION I
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November 12, 1997 MEMORANDUM TO: Thomas H. Essig, Chief Generic issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation FROM:
Claudia M. Craig, Senior Project Manager g
g Genenc lasues and Environmental Projects Branch
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Division of Reactor Program Management Office of Nuclear Reactor Regulation SJBJECT:
SUMMARY
OF MEETING WITH WESTINGHOUSE TO DISCUSS REACTOR COOLANT PUMP (RCP) THERMAL BARRIER DEGRADATION The subject meeting was held at the Nuclear Regulatory Commission (NRC) offices in Rockville, Maryland on October 22,1997, between representatives of Westinghouse and the NRC staff. The NRR staff requestad Westinghouse provide additionalinformation regarding the RCP thermal barrier degradation that occurred in France and the susceptibility of RCPs in the U.S. to similar degradation. Attachment 1 is a list of meeting participants. Attachment 2 is the presentation material that Westinghouse provided after the meeting via letter dated October 29, 1997.
The meeting consisted of a summary of the information regarding the French RCP thermal barrier degradation, a comparison of the different models of RCP and the similarities and differences between the U.S. RCPs and the French model that experienced the degradation, a discussion of the cause of the degradation, the susceptibility of U.S. RCPs to simi,ar cracking, and the RCF maintenance recommendation.
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'A There are several unique features of the EDF French RCP that do not exist in the U.S. RCPs, including a single seal injection point, the material used in the pump, a machined notch, and the solami. (The sotami is the commercial name for a product of layered foil metal used to provide p( 'g' therma! Insulation between the thermal barrier housing intemal diameter and the cooling coils.)
The single sealinjection point results in nowniform flow in the RCP which results in uneven stresses. Westinghouse and EDF performed a thorough analysis of the degradation and
- [YM-determined the cause was brittle failure for one section of the degradation and fatigue loading for the other section of degradation. Because of the design and material differences between the French and the U.S. RCPs, Westinghouse does not expect a similar degradation mode in
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RCPs in the U.S.
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November 12, 1997 in a follow up telephone conversation with Westinghouse to clarify the presentation material,
- the staff inquired whether licensees with model 93 RCPs were made aware of the EDF type 3 cracking potential in response to questions regarding the applicability of Information Notice 97 31. Westinghouse responded that the meeting material was sent to the Westinghouse Owners Group, the information will be addressed in an upcoming RCP workshop, and Westinghcuse is planning to issue a Technical Service Bulletin.
Attachments: As stated cc w/atts: See next pege
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November 12, 1997
. T. E ssig-
-2 in a follow-up telephone conversation with Westinghouse to clarify the presentation material, the staff inquired whethor licensecs with model 93 RCPs were made aware o1 the EDF type 3 cracking potential in response to qucstions regarding the applicability of Inforrnation Notice 97 31. Westinghouse responded that ths meeting material was sent to the Westinghouse Owners Group, the information will be addressed in an upoming RCP workshop and Westinghouse is planning to issue a Technical Service Bulletin.
Attachments: As stated cc w/atts: See next page
- DISTRIBUTION: See next page DOCUMENT NAME: 10_22_97. MIN
- See previous concurrence OFFyE PGEBp,[glg l (A)SC:PGEB EO: EMEB NAME CCraihsIk MCase*
RWessman*
DATE 11/\\thl7 11/5 /97 11/ 12 /97 OFFICIAL RECORD COPY 5
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. DISTRIBUTJON: Mtg. Summary w/ Westinghouse Dated _flovember__12J197 Hard Copy CaritralFiles PUDLIC PGEB R/F -
MCase CCraig OGC
-ACRS E-mail SCollins/FMIRAGLIA RZimmerman -
JRoe/DMatthews BSheron GLainas/JStrosnider RWessman
. KManoly EBrown, AEOD JVora, RES FGrubelich BElliot JJackson, RES 4-m
m WESTINGHOUSE /NRC MEETING RCP THERMAL BARRIER OCTOBER 22,1997 MEETING PARTICIPANTS NAME ORGANIZATION Claudia Craig NRC/NRR/PGEB John Crane Westinghouse NSD lan Wilson Westinghouse NSD Timothy Dunn Westinghouse EMD Jerry Jackson NRC/RES/DET/EMMEB Earl Brown NRC/AEOD/SPD Jit Vora NRC/RES/DET Francis T. Grubelich NRC/NRR/EMEB Barry Elliot NRC/NRR/EMCB Kamal Manofy NRC/NRR/EMEB i
ATTACHMENT 'l l
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