ML19330B853

Part 21 Rept Re Defective GE Circuit Breakers in metal-clad Switchgear.Snap Ring Deformed by Links in Breaker Mechanism Moving Out of Alignment.Caused by Loose Breaker Main Output Cranks.Breakers Returned to GE

ML19330B853
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-PT21-80-258-000, REF-PT21-80-258-001 NUDOCS 8008070075
Download: ML19330B853 (3)

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IWAh 21 f w IDENTIFICATION M-M57-NO. 600 CD'9ANY R@ E f Mf& . h

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TERA ACTION:

PRELIMINARY EVALUATION OF THE ATTACHED REPORT INDICATES LEAD RESPONSIBILITY FOR

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$ TONE 6 WEBSTER ENGINEERING CORPORATION ~

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ADDRESS ALL CORRESPONDENCE TO P.O. BOX 2325. BOSTON. MASS. 02107 I

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. . . Mr. Victor Stello, Director

July 23,-1980

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Office of Inspection and. Enforcement a-

, U.S. Nuclear Regulatory Commission Washington, DC 20555

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Dear Mr. Stello:

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NOTIFICATION OF DEFECT,10CFR21 b SHOREHAM NUCLEATi POWER STATION - UNIT 1

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LONG ISTAND LIGHTING COMPANY

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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.

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

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

Mr. P. A. Wild, Director of Engineering Stone & Webster Engineering Corporation Post Office Box 2325 Boston, MA 02107 -

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2. , Identification of the facility, or the basic component supplied for such facility, which contains a defect:

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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 of the defect and the safety hazard which could be created by such defect: ,

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o-There exists a departure from the technical requirements 7~ ;

' of a procurement document in that breakers could have'

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failed to operate as specified. .-

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The defective circuit breakers are basic components-in GE

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7.Y metal-clad switchgear (4 kV) and the -switchgear has- been

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delivered to a purchaser.

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As a result of loose breaker main output cranks, other Y ~2 m ka in the breaker mechanism moved out of alignment and' N -

depacted the prop pin snap. ring. The effect of these -

^9 impacts deformed the snap ring sufficiently to allow it m

tio fall off the prop pin. This could result in the g[,-

failure of the breaker to operate properly.

_- The breakers are required under design basis events to 1 assure the capability to shut down the reactor and f

" maintain it in a safe shutdown condition. Degradation of such essential safety-related equipment represents a f

major reduction in the degree of protection provided to the public health and safety and results in a substantial

.1 safety hazard.

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5. Date on which information of'such defect was obtained:

July 23,1980 i

6. In the case of a basic component which contains a defect, the number and location of all such components in use at, supplied for, or being supplied for facilities subject to the regulation:

Shoreham Nuclear Power Station 65-4 kV swithgear circuit breakers of which 29 are used in safety-related applicacion.

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7. The corrective action which has been, is being, or will be taken; name of individual or organization responsible; and length of time taken to complete the action:

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All 65 breakers at the Shoreham site were returned to GE u

for corrective work. Corrective action consisted. of

! complete disassembly of each breaker mechanism for inspection with replacement af parts as necessary.

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GE factory engineering and Quality Assurance groups have

[_ been apprised of this problem to prevent. recurrence.

The identified corrective action has been completed.

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8. Advice' related to the defect th'at has been given to purchasers or licensees:

No other action apart from that specified under the previous section.

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Identificatica'of this defect and the~ filing of this report are results "

{ of a. review of-10CFR50.55(e) Reports and Licensee Event Reports filed by S&W clients since January 6,-1978. This review,' committed to in our .

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letter to NRC of September 6, 1979, resulted from the NRC special -

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inspection (,f May 1-4, 1979. ' NRC has been previously advised of this Problem by IILCO motification on November'.17,1978, in accordance with

• 10CFR50.55(e) .

._. If you require any further information, please contact S. B. Jacobs at 617-973-5264.

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V iry truly yours[-

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