ML18053A389

Part 21 Rept Re Missing Cotter Pin in Ite Breaker Trip Mechanism Resulting in Breaker Failing to Close.Initially Reported on 880513.Breaker Repaired,Cotter Pin Inserted & Breaker Reinstalled

ML18053A389
Person / Time
Site:	Palisades
Issue date:	05/20/1988
From:	Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Office of Nuclear Reactor Regulation
References
REF-PT21-88, REF-PT21-88-058-000 PT21-88-058-000, PT21-88-58, NUDOCS 8805260145
Download: ML18053A389 (2)

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consumers Power Kenneth W Berry POWERINli Director MICHlliAN'S PROliRESS Nuclear Licensing General Offices: 1945 West Parnall Road, Jackson, Ml 49201 * (517) 788-1636 May 20, 1988 Director Nuclear Reactor Regulation Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -

10CFR PART 21 REPORT - I.T.E. CIRCUIT BREAKER COTTER KEY MISSING This letter provides written follow-up notification of a missing cotter pin in an I.T.E. breaker trip mechanism that resulted in the breaker failing to close. The breaker is an I.T.E. K225, 480 Volt K-line circuit breaker used for charging pump breakers.

Eight of these breakers were sent to Asea Brown Boveri in Troy, Michigan for refurbishing. Following refurbishment, the breakers were returned to the Palisades Plant and installed. Thereafter, one breaker failed to the trip-free position and would not close when given a close signal. It was removed and, following comparison with other breakers, found to have the cotter pin in the tripper bar mechanism in the escutcheon assembly of the breaker trip mechanism missing. Evidence indicates that the cotter pin was never installed. The seven remaining refurbished breakers were found to have their cotter pins in place.

This deficiency was discovered in May of 1987, and on July 7, 1987 determined not to be reportable per 10CFR Part 21. However, following QA review, a revised reportability determination has been made. The site resident inspector was verbally notified on May 13, 1988. However, due to an over-sight, the written confirmation was not processed in the required 5-days following receipt of the notification information; i.e., in this case, following determination of reportability.

The molded assembly with the missing cotter pin was supplied to the Troy, Michigan service shop by BBC Brown Boveri, 35 North Snowdrift Road, Allentown, PA 18106.

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• lf>CFR Part 21 Report I.T.E. Circuit Breaker Cotter Key Missing May 20, 1988

• 2 The breaker was repaired, the cotter pin inserted, and the breaker was reinstalled.

The responsible site individual for corrective action is Mr S R Oakley, Electrical Engineering Section Supervisor.

All corrective actions were completed by July 6, 1987.

Kenneth W Berry Director, Nuclear Licensing CC Administrator, Region III, NRC NRC Resident Inspector - Palisades OC0588-0016A-NL02

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