ML19256A666

LER 78-032/03L-0 on 781204:during Refueling Operations & Containment Spray Sys 1 Automatic Actuation Test,Valve V-21-78 Failed to Open.Caused by Valve Motor Breaker Not Racked Properly & Overload in Trip Position

ML19256A666
Person / Time
Site:	Oyster Creek
Issue date:	01/03/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256A663	List: ML19256A662 ML19256A666
References
LER-78-032-03L, LER-78-32-3L, NUDOCS 7901090176
Download: ML19256A666 (3)

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7 6 60 ET NUYB ER (W EVENT C ATE 14 7b REPORT DATE EVEN' OEsCRIPTION AND PROBABLE CONSEQUENCES h o 2 l Durina refuelina operat ions, while performina the Containment Sorav i jo 3 l System I auto actuation test, valve V-21-78 failed to open. Normally, l o 4 the valve opens to allow recycled coolant to discharge into a spray [

o 3 l header over the absorption pool. Safety significance is considered l o e l minimal since System II was operational. l 0l7 l 0 E l 7 8 9 80 SYSTEY CAUSE C A US E COYP \ALvE CODE CODE SUECODE COYrONENT CCCE SUECODE SUSCODE o e l S j Bl@ l A l@ l C l@ Cl Kl Tl Bl Rl Kl@ l A l@ W @

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40 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l The cause of the failure was attributed to the valve motor breaker not l j i jil l being racked in properly and the overload being in the trip position. I l

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T y Madison Avenue at Punch Bowl Road Mornstown, New Jersey 07960 (201)455-8200 OYSTER CREEK "JCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/78-32/3L-0 Report Date January 3, 1979 Occurrence Date December 4, 1978 Identification of Occurrence Failure of Containment Spray System I torus spray valve V-21-18 to function when called upon to do so. This event is considered to be a reportable occurrence as defined in tha Technical Specifications, paragraph 6.9.2.b.2.

Conditions Prior to Occurrence The plant was in a refueling shutdown.

Mode switch positicn - refuel.

Reactor coolant temperature - 171.8 F.

Description of Occurrence On December 4, 1978, at approximately 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />, during Containment Spray System I automatic actuation test, valve V-21-18 failed to open. Normally, the valve opens to allow about five percent of recycled coolant flow discharge through a spray header in the atmosphere over the absorption pool.

Apparent Cause of Occurrence The valve motor breaker was not racked in properly and the overload was found in the trip position.

Analysis of Occurrence The failure of valve V-21-18 to function is considered to be of minimal significance, since the containment spray cooling system consists of two, independent, cooling loops, each capable of removing fission product decay Jersei Centra: Power & Lign: Company is a M "N- O' tne Gene a! Potac Uthes System .

Reportable Occurrence No. 50-219/78-32/3L-0 Page 2 Janua ry 3,1979 heat f rom the prima ry contai nment. Eaca loop consists of a pair of spray headers in the drywell vessel. Each pair of spray headers is fed by two pumps and two heat exchangers. Either pump and either heat exchanger in a loop is capable of removing fission product decay heat from the primary containment system. Failure of this valve to operate resulted in a loss of system redundancy.

Corrective Action The valve motor breaker was racked in properly and the notor overload was reset. The valve was then tested for operability and the amperage readings were found to be normal. Additionally, a procedure is being generated giving detailed instructions concerning racking breakers in and out.

Failure Data Not applicable.

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