ML20126E792

RO 50-219/75-33:on 751212,during 6-month Load Test on a Station batteries,125 Volt Dc Distribution Ctr de-energized Causing A,E & C Recirculation Pumps,Feedwater Pump & Cleanup Sys Pump to Trip.Caused by Personnel Error

ML20126E792
Person / Time
Site:	Oyster Creek
Issue date:	06/01/1976
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-50-219-75-33, NUDOCS 8103020465
Download: ML20126E792 (3)

Text

. Update Report - Previous Report Date: 12-23-75 T

LICENSEE EVENT REPC' T CONTF:OL OLOCK:l l l l l l l (PLEACE PRITJT ALL REQUll:ED I/JF0nL1 Allo 1 6 fat t

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[~0)) l N I J I ol c l P l 1l l 0 l 0 l-l 0101010101-1010 l l 4 l 1 l 111_l 1_J l 011 l 7 09 14 15 25 26 30 31 32 CATEGOAY TV SU DOCKET NUMDEH (VENT DATE REPORT DAir QCON1 l l 68J lTl l Ll l 0 l 5 l 0 l- l 0 l 2 l 1 [9] l1 j 2 l 1l 2l 7l 5l l0 l6 l0 l1 l 7p 7 6 57 59 60 61 GB 69 74 75 i EVENT DESCRIPTION

@[]l Durinta routine 6-month load test on A stad on batteries, personncI error in 7 89 {

@l following procedure 601.2.2 caused the 125 volt DC distribution center to be 7 89 g

@l deencrg2:ed. After reencrgizing the center, the A, C and E recirculation pumps, A 7 89 ,'

@l feedwater pump and cleanup system A recirculation pump tripped. (This is expected 7 gg '

@j] (_itr_the return of DC power. ) Plant shutdown commenced immediately because of 7 89 (Continued sv h c Aua on attached sheet.) ret Co e uni CouwT t

CODI CODE cot /PONf NT CODE SUFMn Musur AcitAin 41DutTON 0 l E!C l l_AJ l C l K l Tl BJ Rl Kl lN l lG l0 l8 l0 l lYl 7 89 10 11 12 17 43 44 47 43 CAUSE DESCFoPTION

@ [ Pcrsonnel error in following procedure 601.2.2 caused the 125 volt DC distribution

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@ {__ center to be deenergized. The distribution center was inmediately reenergized.

7 09 t 3l A _c}mnle has been drafted to existing procedure 601.2.2 to define more clearly ~

7 09 ,(Cpptinued on attached sheet.) t gy,ggg g, SIATUS  % F'Dwin OTHCR S1ATUS Or6COVfHY DISCOVE RY DISCT4.P10N

@ (jL) 10 l 8 dj l NA l l Bl l NA 7 0 10 12 13 44 45 46 f_

AC T M1 Y COQTEN1 Oltf A560 of AMOUNT OF ACTMT V LOCA10N Of AEL(ALE 12 l2l l 2lrsill ASE l NA l l NA 7 0 5 10 11 44 45 t PERSONNEL EXPOCURES NUVH4 TYPE DE LCfhPTON 13 @ l 0l 0l l 2l l NA 7 0S 11 12 13 ,

L PERCONNEL INJun:EG .

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Probable Consequences

@l 7 09 NA 0 j LOSG OR DAM AGE TO FACILITY TYPt DLSCAPTON 1i [_j l NA ,

7 89 10 U PUbtlCIT Y l

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i A DDil lO'.' 4L FACTORS l

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Donald A. Ros.

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Manager u : ,

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l h~2hhUbtOffbOCk0 f)J OYSTER CREEK NUCLEAR GENERATING STATION Addendum to

" "' * ~f-AF-5 Licensee Event Report Reportable Occurrence No. 50-219/75-33 During an inspection conducted by Mr. E. Greenman on March 17-19, 1976 (Inspection No. 76-11), discussions with plant personnel were conducted concerning the subject reportable occurrence. It was noted that in addition to the accidental tripping of A, C, and E recirculation pumps, which was the basis for the reportable occurrence, the "C" recirculation pump was removed from service later that saae day and was not reported.

l The "C" pump was removed to replace its associated 4160-Volt breaker I due to a burned out trip coil whidt failed after the pump was accidentally tripped. The subsequent removal of the pump for required corrective maintenance is considered to be an extension of the initial e cent. As noted by Mr. Greenman, all actions associated with the removal and restart of "C" recirculation pump were performed in accordance with license requirenents. Accordingly, the following addendum to the subject report is herewith submitted. ,

At 1247, "C" recirculation pump was removed from service to replace 3 its associated 4160-Volt breaker. As per license requirement, a plant shutdown )

was initiated incediately. At 1250, breaker replacement was completed and the )

load reduction was terminated. Breaker replacement was necessitated due to a burned out trip coil which occurred after the breaker tripped during the initial event. The burned out trip coil caused all automatic trips associated with the breaker to be defeated. From the time it was discovered at 100S until it was replaced, an electrician was stationed at the breaker under the direction of the control room operator to trip the breaker if the need arose.

The reason for the trip coil failure is thought to be caused by a turn to turn short, which resulted in a burned out coil.

A check of the circuit which applies power to the coil did not i reveal any abnormalities which could have caused the failure.

Failure Data: l j

Manufacturer: General Electric Company ,

l Type: 125 Volt DC Tiip and Release Coil Catalog No.: 6174582G-1

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i, LICENSEE EVENT REPORT Update Report - Previous Repart Date: 12-23-75 Afay 25, 1976 i 4 Reportable Occurrence No. 50-219/75-33 ,

l Page 2 EVENT DESCRIPTION - Continued license requirements. Recirculation pumps became operabic and load reduction was terminated.

Later that same day, the "C" recirculation pump was removed from service to replace its associated 4160-volt breaker. Breaker replacement was necessitated '

due to a burned out trip coil which occurred after the breaker tripped during the initial event. Again, plant shutdown commenced immediately. Breaker re-placement was completed and the load reduction was terminated. (Reportabic Occurrence No. 50-219/75-33.)

CAUSE DESCRIPTION - Continued ,

the steps to be taken in preparation for conducting the battery load test.

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