ML20062H833

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Responds to Action Item 3 of IE Bulletin 82-02, Degradation of Threaded Fasteners in RCPB of PWR Plants. No Incidents of Leakage in Bolted Closures Evident.Maint Procedures Specify FEL-PRO-N-500 Per Westinghouse Ltr
ML20062H833
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 08/02/1982
From: Schuyler J
PACIFIC GAS & ELECTRIC CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
REF-SSINS-6820 IEB-82-02, IEB-82-2, NUDOCS 8208160178
Download: ML20062H833 (3)


Text

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l. o Bulletin Reply 82-02 56-275/323 s "1. VED PACIF'IC OAS AND E LE C T RI C; gC O M PANY TPGWIE j 77 BEALE STREET
  • SAN FRANCISCO, CAllFORNIA 94106 . (415)781 4211 T X h-372-6587 s.o.sesuvten O ! ;T ;

n .u m 8svCLf a# POeLe Gt4(D ATKes August 2, 1982 I

Mr. R. H. Engelken, Regional Administrator U.S. Nuclear Regulatory Commission, Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 Re: Docket No. 50-275, OL-DPR-76 1 Docket No. 50-323 i Diablo Canyon Units 1 and 2 Degradation of Threaded Fasteners - IEB 82-02

Dear Mr. Engelken:

In accordance with the reporting requirements of IE Bulletin 82-02, this letter contains the information required by Action Item 3 regarding bolted closure leakage and fastener lubricants.

The response required by Action Items 1 and 2 of IEB 82-02 will be submitted consistent with the requirements of the Bulletin.

Bolted Closure Leakage: The Bulletin requirements are to identify those bolted closures of the reactor coolant pressure boundary that have experienced leakage, describe inspections made and corrective measures taken. There have been no incidents of leakage in the bolted closures of the reactor coolant pressure boundary of either Unit 1 or Unit 2.

Fastener Lubricants: The Bulletin requirements are to identify closures and connections where fastener lubricants have been or are being used and report on plant experience, particularly any 4 instances of stress corrosion cracking.

A review of Plant Maintenance Procedures identified five procedures that specified the application of fastener lubricants that have been identified by IEB 82-02 as potential agents for causing stress corrosion cracking. Although no evidence of stress corrosion cracking has been observed in any of the fasteners, plant maintenance procedures have been changed in response to recent industry findings. As a result, four of the five plant 8208160178 820802 PDR ADOCK 05000275 G PDR

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Mr. R. H. Engelken August 2, 1982 Page 2 maintenance procedures that formerly specified Molykote Z, FEL-PRO-CSA or FEL-PRO-N-1000 now specify FEL-PRO-N-5000 in accordance with Westinghouse Nuclear Service Division Data Letter DL-82-01 dated January 22, 1982. The fifth maintenance procedure that addresses removal and installation of steam generator manway covers will be revised to include the use of FEL-PRO-N-5000 when Westinghouse provides new fastener torque values.

Injection Sealant Materials: The Bulletin requirements are to identify closures and connections where injection sealant materials have been or are being used and report on plant experience, particularly any instances of stress corrosion cracking. No injection sealant materials have been used in either Unit 1 or 2.

I am authorized to sign and file this submittal with the NRC, and the matters set forth herein are true and correct to the best of my knowledge and belief.

Approximately 28 man-hours were required to research and prepare this response.

Very truly yours, Subscribed and sworn to before me this 2nd day of A ust, 1982.

l SEAL l Niancy J /Lpfha'stbr.,.__ Notary Putlic in and for the City and County of San Francisco, State of California My Commission expires April 14, 1986.

i Robert Ohlbach l Philip A. Crane, Jr.

Atto e s for Pacific l

Gas Ele tric an ~

BY A > ~ W, '

Philip 7NErane, Jr l

. s* . ; -

Mr. R. H. Engelken August 2, 1982 Page 3 cc: Service List O