ML20076E283

Interim Deficiency Rept Re Failure of Brown Boveri K-line 480-volt Load Ctr Circuit Breaker Prop Latch Assemblies. Initially Reported on 830418.Prop Latch Assemblies Mfg in Dec 1974 & Jan & Feb 1975 Will Be Replaced

ML20076E283
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	05/18/1983
From:	James Smith LONG ISLAND LIGHTING CO.
To:	Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, SNRC-891, NUDOCS 8306010011
Download: ML20076E283 (3)

Text

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gm.g i i LONG ISLAND LIGHTING COM PANY i

kNf nu.r-- - -- r= d SHOREHAM NUCLEAR POWER STATION P.O. BOX 618, NORTH COUNTRY ROAD e WADING RIVER, N.Y.11792 Direct Dial Number May 18, 1983 SNRC-891 Mr. James M. Allen Acting Regional Administrator Office of Inspection & Enforcement, Region 1 U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Long Island Lighting Company Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322

Dear Mr. Allen:

On April 18, 1983, in accordance with 10CFR50.55(e), we reported to Region 1 a reportable deficiency concerning Brown Boveri K-line circuit breaker prop latch assemblies.

This letter serves as our 30-day written report of this deficiency, and 6:. scribes the corrective action to be taken.

Description of Deficiency In December 1982, a prop latch in a K-1600S breaker (480VAC load center) failed at Shoreham. The failure of the prop latch released the spring retention mechanism and caused this closed breaker to trip open.

On January 12, 1983, the failed prop latch was sent to Brown Boveri for evaluation. Subsequently, three additional (unfailed) prop latch assemblies were supplied, on March 23, 1983, from Shoreham's 480V load center breakers. These additional prop latches were supplied in accordance with a request from Brown Boveri in order to increase the specimen

_ng population for their evaluation.

k$a

@@ The results of the evaluation,which included destructive no testing of the three additional specimens, by Brown Eaveri,

'O were provided to LILCO verbally on April 11, 1983 and in an

[g April 20, 1983 letter. This evaluation revealed that there og had been a heat treating problem and that the prop latch assemblies 3a O<

had been subject to two successive heat treating processes.

These two heat treating processes resulted in an undesirable om hardness that made the prop latch brittle and susceptible to

@$m breaking. Brown Boveri stated that this problem is confined to the breakers supplied on their original sales order, which FC-8935.1 g

SNRC-891 May 18, 1983 Page two' were manufactured in December 1974, January 1975 and February 1975. This order included eighteen.(18) K-1600S breakers and eighty. (80) K-600S breakers , all of which use the same type prop latch assembly.

~

As a result of our review;of the evaluation performed by Brown Boveri, we determined that this situation constitutes a reportable deficiency under the provisions of 10CFR50.55(e).

CORRECTIVE ACTION The prop latch assemblies for the 480VAC load center breakers which have manufacturing dates indicative of the affected period will be replaced. The replacement of the twenty-four (24) suspect prop latches in the Category I breakers will be' completed prior to fuel load. The replacement of the suspect

prop latches in the Category II breakers will be completed on a schedule determined by equipment, spare part, and manpowar availability.

Very truly yours, Cd i J. L.. Smith Manager, Special Projects Shoreham Nuclear Power Station ,

MRL/spg cc: Mr. Richard DeYoung, Director NRC Office of Inspection & Enforcement Division of Reactor Operation Inspection Washington, DC 20555 Mr. J. Higgins, Site NRC "All Parties Listed in Attachment 1" w _ ..

ATTACllMENT 1 Herbert'H. Brown, Esq.

Lawrence Brenner, Esq. Lawrence Coe Lanpher, Esq.

Administrative Judge Atomic Safety and Licensing Karla J. Letsche, Esq.

Board Panel Kirkpatrick, Lockhart, Hill U.S. Nuclear Regulatory Commission Christopher & Phillips Washington, D.C. 20555 8th Ploor 1900 M Street, N.W.

Washington, D.C. 20036 Dr. Peter A. Morris Administrative Judge Atomic Safety and Licensing Mr. Marc W. Goldsmith Board Panel Energy Research Group U.S. Nuclear Regulatory Commission 4001 Totten Pond Road Washington, D.C. 20555 Waltham, Massachusetts 02154 Dr. James H. Carpenter MHB Technical Associates Administrative Judge 1723 Hanilton Avenue Atomic Safety and Licensing Suite K San Jose, California 95125 Board Panel U.S. Nuclear Regulatory Commicsion Washington, D.C. 20555 -

Stephen B. Latham, Esq.

Twomey, Latham & Shca Daniel F. Brown, Esq 33 West Second Street Attorney P.O. Box 398 Atcmic Safety and Licensing Riverhead, New York 11901 Board Panel Ralph Shapiro, Esq.

U.S. Nuclear Regulatory Commission 20555 Cammer and Shapiro, P.C. ,

Washington, D.C.

9 East 40th Street New York, New York 10016 Dernard M. Bordenick, Esq.

David A. Repha, Esq.

U.S. Nuclear Regulatory Commissic.1 Matthew J. Kelly, Esq.

Washington, D.C. 20555 State of New York Department of Public Service James Dougherty Three Empire State Plaza 3045 Porter Street Albany, New York 12223 Washington, D.C. 20008

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