ML20010H521

Second Interim Deficiency Rept Re Potential for Coil Failure of GE Type Hfa Relays Supplied by Brown,Boveri Electric, Initially Reported 810513.Also Reported Under Part 21.Vendor Requested to Expedite Replacement Parts Shipment by 820131

ML20010H521
Person / Time
Site:	Bellefonte
Issue date:	09/16/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8109240566
Download: ML20010H521 (2)

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TENNESSEE VALLEY AUTHORITsYp CH ATTANOOG A, TENNESSEE 37401 400 Chestnut Street Tower II 3 e . QU

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September 16, 1981 BLRD-50-438/81-37 BLRD-50-439/81-40 N

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• s Mr. James P. O'Reilly, Director {

Office of Inspection and Enforcement k) ,"f $ Vq%4.,(?[,7 f -9, U.S. Nuclear Regulatory Commission H g ' ,*'ji D Pegion II - Suite 3100 101 Marietta Street g- g sg ,:> -

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Dear Mr. O'Reilly:

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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - GE RELAY DEFICIENCY -

BLRD-50-438/81-37, BLRD-50-439/81 SECOND INTERIM T2 PORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on May 13, 1981, in accordance with 10 CFR 50.55(e) as NCR BLN EEB 8101. This was followed by our first interim report dated June'12, 1981. Enclosed is our second interim report. We expect to submit our next report by March 2, 1982. We consider 10 CFR Part 21 applicable to this deficiency.

If you have any questions concerning thias matter, please get in touch with D. L. Lambert at FTS 857-2581.

Very'truly yours, TENNESSEE VALLEY AUTHORITY r

. M. Mills,11anager Nuclear Regulation and Safety Enclosure cc: Mr. Victor Stello, Jr., Director (Enclosure) 7 Office of InspcMion and Enforcement U.S. Nuclear Regulatory Commission

[C S Washington, DC 20555

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[d;DR ADOCK 05000438 PM An Equal Opportunity Employer

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l ENCLOSURE 3ELLEFONTE NUCLEAR PLAfiT UNITS 1 AND 2 GE RELAY DEFICIENCY BLRD-50-438/81-37, BLRD-50-439/81-40 10 CFR 50.55(e)

SECOND INTERIM REPORT Description of Deficiency General Electric service advice letter PSM-721-152.2 dated November 21, 1980, identifies the potential for coil failure of GE type HFA relays manufactured between 1974 and 1979. The Lexan coil spools of these relays are susceptible to stress cracks and embrittlement caused by thermal aging and improper mixing of the Lexan. This nonconformance is significant in that a cracked coil spool could result in improper relay function upon energization or deenergization af the relay. GE type HFA relays were furnished in Class IE and non-Class IE 6.9 and 13.8 kV switchgear suppited by Brown Boveri Electric, Incorporated (BBE).

Interim Progress TVA has accepted BBE's proposal to furnish the GE Century series coil with Terzel spool and high temperature wire for replacement of existing hardware p in HFA relays covered by this nonconformance. BBE wi'a also supply new relay nameplates, the installation procedure for replacement parts, and certification that the modified Class IE relaya are qualified for their service environment. The vendor is being requested to expedite shipment of replacement parts by January th- 1982. TVA will perform the labor to change out these coils.

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