ML19345D384

Deficiency Rept Re Inoperable GE Circuit Breaker Limit Switches,Resulting in Failure of Switch Contacts to Close. Caused by Loosened Limit Switches.Screws Will Be Tightened & Lock-tite Applied

ML19345D384
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	12/02/1980
From:	Wild P STONE & WEBSTER ENGINEERING CORP.
To:	Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-80-258-003 NUDOCS 8012120618
Download: ML19345D384 (4)

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Mr. Victor Stello December 2, 1980 Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Stella:

NOTIFICATION OF DEFECT, 10CFR21 SHOREHAM NUCLEAR POWER STATION - UNIT 1 LONG ISLAND LIGHTING COMPANY Stone & Webster Engineering Corporation (S&W), pursuant to the provisions of 10CFR21 hereby provides notification of a " defect" concerning the Shoreham Nuclea7 , Power Station, Unit 1, owned by Long Island Lighting Company (LILCO) and for which S&W provided both engineering and construction services.

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

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

Shoreham Nuclear Power Station, Unit 1 General Electric Company (GE) 4 kV switch'g'6ar' circuit breaker - Limit Switches

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:

There exists a departure from the technical requirements of a procurement document in that breakers could have failed to operate as specified.

The defective circuit breaker limit switches are basic components in GE metal-clad switchgear (4 kV) and the switchgear has been delivered to a purchaser and installed in accordance with manufacturer's requirements.

Various limit switches on several breakers had become loose.

This enabled the limit switch to move away from its operating lever and permitted the switch contacts to return to their normally open position. The resulting loss of continuity in the breaker control circuit would result in the inability of the breaker to close.

The breakers are required under design basis events to assure the capability to shut down the reactor and maintain it in a safe shutdown condition. Degradation of such essential safety-related equipment represents a major reduction in the degree of protection provided to the public health and safety and results in a substantial safety hazard.

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

December 2, 1980

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 l Our investigation to date has shown no defect exists on any other S&W plants. Should this information change, this report will be supplemented and appropriate advice given to purchasers or licensees.

l l 7. The corrective action which has been, is beingl'br-will be taken; I name of individual or organizaton responsible; and length of time I taken to complete the action:

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The limit switch screws will be tightened and lock-tite will i

be applied at Shoreham Nuclear Power Station. This work will be completed by December 1980. In addition, station breaker l

inspection procedures will be revised to require inspection and, as necessary, service of the limit switches.

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8. Advice related to the defect that has been given to purchasers or licensees:

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

NRC has been previously informed of this problem by LILCO submittals SNRC-466 dated March 5, 1980, and SNRC-483 dated July 7, 1980, under 10CFR50.55(e). This problem concerns the same GE switchgear, whereby S&W submitted 10CFR21 reports to you dated July 23, 1980, concerning snap rings, fuse holders, and closing latches.

If you require an'; further information, please contact Mr. R. B. Bradbury at 617-973-0291.

Very truly yours, s h : N $N P. A. Wild Director of Engineering PAS:Imh

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