ML19350D923

LER 81-040/99X-0:on 810422,during Operating Surveillance Test on Fire Protection Sys,Carbon Dioxide Discharge Timer for West Cable Vault Unit Was Cycling Too Fast.Caused by Bad Resistor in Timer.Resistor Replaced & Returned to Svc

ML19350D923
Person / Time
Site:	Beaver Valley
Issue date:	05/21/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19350D922	List: ML19350D921 ML19350D923
References
LER-81-040-99X, LER-81-40-99X, NUDOCS 8105270137
Download: ML19350D923 (2)

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U.S. NUCLEAR REIULA702Y COMMIS$10N MRC FZCM 364 a.m . *

• LICENSEE EVENT REPORT (v]

CCNTROL BLOCK: l i

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(PLEASE PRINTOR TYPE ALL REQUIRED INFORMATION) lg lo li 8} 9l? J UCENSEE 7

A l 3CCOE lV l S l1 t$l@l 0 l0 l-uCENSE to l 0 l010NuMS".R l0 lC l- l0 l0 l@l4 2$ 26 uCENSE l1 TYPE l111 JG l1SFCAT68 l@[ l CCN'T lolil Eu',"eg I L l@l 015 l 0 l 010 l 3 l 314Jl69 0 l 4EVENT twi l 2OATE l 2 l 8 ] 1l@l 01REPORT 74 ?5 5l 21 11 81801l@

O ATE 7 4 60 64 OOCKET NUMS ER EVENT DESCRIPTION AND PROBABLE CCNSECUGCES h lo l 21 l On 4/12/81 during the performance of an operations surveillance test on the fire 'l go,3; l protection system, the carbon dioxide discharge timer for the west cable vault unit l l

Io All was found to be evcling too fast, thus limiting the discharge and pre-discharee I

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f a l s f I warning times. At 1230 hours0.0142 days <br />0.342 hours <br />0.00203 weeks <br />4.68015e-4 months <br />, the uriit was declared inoperable and a continuous i a H j l fire watch was established as per Technical Soccification 3.7.14.3. Manual l l

l a l 7 l l operation of the system was possible at this time.

l 10t4I I 40 7 8 9 COMP. VALVE SYSTEM CAUSE CAUSE SUSCCOE COMPCNENT CODE SUSCODE SUSCODE CCCE CCOE 1o691 7 8 I A in l@ it l@ I A l@ IJla le it ! A [Y IX lh lM l@ lZ lh 9 10 11 12 1d 19 20 REVISICN SECUENTIAL OCCURRENCE REPORT

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EVENT YEA R R EPORT NO.

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@ a5g; isI11 23 24 ;r 27 23 23 33 31 32 L.21 22 COMPONENT ATTACHMENT NPRO4 PRtME COMP.

AC* TON FUTU R E EFFECT SHUTOCWN SUSMITTED PCAM >US. SU*PU ER MANUFACTURER TAAIN ACTICN CN PLANT METHCO HOURS J@ l 0 10 l 0 } 0 l lY l@ lNj@ lAj@ l Cl 1l 2l 5l@

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JJ 4 l04Z l@ OS 37 40 44 42 43 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTTCNS Il 6 o } } A bad resistor in the timer was found resconsible for its faulty operation. It was 1 I

it li l l replaced and returned to service on 5/14/81. Soare timine units arn on ordar, I

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80 OTHEN STATUS OiS C Y DISCOVERY DESCRIPTf 0N

TA %PCWER N/A l 3 l@l Performing surveillance test l l1

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• Attachment To LER 81-40/99X Beaver Valley Power Station Duquesne Light Company- -

Docket No. 50-334

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No further information is available or needid e to satisfy the reporting

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requirement.' .

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