PNO-III-85-094, on 851107,bypass Reactor Trip Breaker B Failed to Operate During Performance of Tests Per IE Bulletin 85-002.Cause Not Stated.Plant Restored to Condition in Which Both Main Reactor Trip Breakers Operable

PNO-III-85-094:on 851107,bypass Reactor Trip Breaker B Failed to Operate During Performance of Tests Per IE Bulletin 85-002.Cause Not Stated.Plant Restored to Condition in Which Both Main Reactor Trip Breakers Operable

ML20198E544
Person / Time
Site:	Kewaunee
Issue date:	11/07/1985
From:	Chrissotimos N, Jackiw N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
IEB-85-002, IEB-85-2, PNO-III-85-094, PNO-III-85-94, NUDOCS 8511140081
Download: ML20198E544 (1)

PRELIMINARY NOTIFICATION OF' EVENT OR UNUSUAL OCCURRENCE--PNO-III-85-94 Date 11/7/85 M This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public int: rest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region III staff on this date.

Facility: Kewaunee Nuclear Power Plant ' Licensee Emergency Classification:

Wisconsin Public Service Notification of an Unusua] Event Corporation Green Bay, WI 54305 Alert Site Area Emergency g

Docket No. 50-305 General Emergency X Not Applicable Subj ct: FAILURE OF REACTOR TRIP BREAKERS At 10:10 a.m. (CST), on November 7,1985, while performing tests on the "B" bypass reactor trip breaker pursuant to IE Bulletin 85-02, the breaker failed to operate. The unit was operating at 100% power at the time of the failure. A spare reactor trip breaker and the "A" bypass reactor trip breaker were successfully tested on November 6 and 7,1985 respectively.

Subsequently, the licensee tested the main reactor trip breakers. The testing resulted in

-the failure of the "A" breaker and the successful passing of the "B" breaker. The licensee has restored the plant to a condition in which both the main reactor trip breakers are now

. operable.

The licensee plans to conduct further testing of the failed breakers.

RegicnIIIspecialists(oneamemberoftheD.C.CookAugmentedIncidentResponseTeam)were cnsite during testing of the breakers and will continue monitoring the licensee's trouble-

• sh nting activities.

-Regi:nIIIwasnotifiedofthiseventat11:00a.m.(CST)onNovember7,1985.NRRandIE hav] also been notified of this event.

Thisin'ormationiscurrentasof3:00p.m.(CST),

f November 7,1985.

CONTACT:

Yrh N.' Ja kiw N . /C sso imos FTS 88-5697 FTS 8-5716 DISTRIBUTION:

H. St. ED0 NRR E/W Willste Mail: ADM:DMB Chairman Palladino PA IE NMSS D0T:Trans only Comm. Zech ELD OIA RES Comm. Bernthal AEOD Conn. Roberts Conn. Asselstine SP //.*/d_ Regional Offices ACRS SECY INP0d'A3 NSAC L IRO CA PDR RIIIResidentO}ffice Licensee: L l J &p (Corp. Office - Reactor Lic. Only) i Region III Rev. November 1985

$11(0001851107

• 0-III-85-o94 pos

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