ML19331D056

Part 21 Rept Providing Notification of Defective Circuit Breakers in GE metal-clad Switchgear.Caused by Degradation of Essential safety-related Equipment.All Breakers Were Returned to GE for Corrective Work

ML19331D056
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	07/23/1980
From:	Wild P STONE & WEBSTER ENGINEERING CORP.
To:
References
REF-PT21-80-258-002 NUDOCS 8008270190
Download: ML19331D056 (3)

Text

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STONE TJ YlEBSTER ENGINEERING CORPORATION 245 SuMutn SrREET. B O STON. MASSACHUSETTS ,;

AD DRE S S ALL CORRE S POND EN CE TO P.O. B OX 2.325. BOSTON. M A SS. 02107

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Mr. Victor Stello, Director July 23, 1980 Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 -

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Dear Mr. Stello:

NOTIFICATION OF DEFECT, 10CFR21 SHOREHAM NUCLEAR POWER STATION - UNIT I LONG ISLAND LIGHTING COMPAST Stone & Webster Engineering Corporation (S&W), pursuant to the provisions of 10CFR21, hereby provides notification of a " defect" concerning the Shoreham Nuclear Power Station, Unit 1, owned by Long Island Lighting Company (LILCO) and for which S&W provided both engineering and construc-tion services.

In accordance with 'the requirements of Section 21.21(b)(3), the followini; information is submitted:

1. Name and address of the individual informing the Commission:

Mr. P. A. Wild, Director of Engineering ,

Stone & Vebster Engineering Corporation Post Office Box 2325 Doston, MA 02107

2. Identification '

the facility, or the basic component supplied for such facilia , which contains a defect:

j Shoreham Nuclear Power Station, Unit 1 General Electric Company (GE) 4 kV switchgear circuit breaker - Snap Rings

3. Identification of firm constructing facility or supplying basic component which contains a defect:

Basic Component supplied by GE ,

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4 Nature o_f the defect and the safety harard which could be .

created by such defect: '.,

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There exists a depa *"- #--- -' * -' # al require ents of a procure =ent docu=ent in that breakers could have .

failed to cperate as specified.

The defective circuit breakers are basic cc:pe:ents in GE metal-clad switchgear (4 kV) and the switchgear has been delivered to a purchaser.

As a result of loose breaker =ain output cracks, other links in the breaker =echanis eved cut of alig=:ent and i=pacted ' the prep pin snap ring. The effect of these i= pacts def =:ed the snap ring sufficiently to allcw it to fall off the prep pin. This could result in the failure of the-breaker to operate properly.

The breakers are required tader design basis events to assure the capability to shut down the reactor and

=aintain it in a safe shutd:w cceditice. Degradatics of such essential safety-related equipment rep' resents a

=ajor reductic: in the degree cf protection provided to the public health and safety and results in a substantial safety harard.

5. Date on dhich infor:stic of such defect was obtained:

July 23, 1930

6. In the case of a basic co:ponent which ccatsics a defect, the number and location of all such ce=penents in use at, supplied for, or being supplied for facilities subject to the regulatica:

Shoreham Nuclear Power Statics 4 kV sdithgear circuit breakers of which 29 are used in safe'ty-related applicacica.

7. The corrective action which has been, is being, or will be

, taken; name of individual or crganization respensible; and length of time taken to co=plete the action:

All 65 breakers at the Shoreham site were returned to GE for corrective work. Corrective actie censisted of cc:plete disasse=bly of.each breaker =echanis: for inspectics with replace =ent of parts as necessary.

GE factory engineering and Quality Assurance grcups have l been apprised of this preble: to prevent recurrence.

The ide=tified corrective actica has been c epleted.

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8. Advice related to the defect that has been given to purchasers or, liceitsees : ;p- .

No other actica apart frem that specified under the previous section.

Identification of this defect and the filing of this report are results of a review of 10CFR50.55(e) Reports and Licensee Event Report,s filed by S&W clients since January 6, 1978. This review, committed to.in our letter to NRC of September 6, 1979, resulted from the NRC special inspection of May 1-4, 1979. NRC has been previously advised of this problem by LILCO n:tification on November 17, 1978, in accordance with 10CFR50.55(e).

If you require any further infor=ation, please contact S. B. Jacobs at 617-973-5264.

Very truly yours, e

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P. A. Wild Director of Engineering PAS:mra

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