05000317/LER-1979-020-03, /03L-0 on 790706:while Performing post-mod Test on Rcs,Power Relief Valves RC-402-ERV Failed to Fully Close After Lifting.Cause Not Determined.Pilot Valve Stroke Adjusted & Relief Valve Stroked Satisfactorily

/03L-0 on 790706:while Performing post-mod Test on Rcs,Power Relief Valves RC-402-ERV Failed to Fully Close After Lifting.Cause Not Determined.Pilot Valve Stroke Adjusted & Relief Valve Stroked Satisfactorily

ML19241B897
Person / Time
Site:	Calvert Cliffs
Issue date:	07/19/1979
From:	Davis S, Miernicki M BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19241B892	List: 05000317/LER-1979-020, Forwards LER 79-020/03L-0 05000317/LER-1979-020-03, /03L-0 on 790706:while Performing post-mod Test on Rcs,Power Relief Valves RC-402-ERV Failed to Fully Close After Lifting.Cause Not Determined.Pilot Valve Stroke Adjusted & Relief Valve Stroked Satisfactorily
References
LER-79-020-03L-01, LER-79-20-3L-1, NUDOCS 7907250298
Download: ML19241B897 (2)

LER-1979-020, /03L-0 on 790706:while Performing post-mod Test on Rcs,Power Relief Valves RC-402-ERV Failed to Fully Close After Lifting.Cause Not Determined.Pilot Valve Stroke Adjusted & Relief Valve Stroked Satisfactorily

Event date:
Report date:
3171979020R03 - NRC Website

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8 60 61 DOCK ET NUM6E R 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEoUENCES O'o io 2

i At 0920 while performing a post modification test on the reactor coolant system I

g i power operated relief valves, RC-402-ERV failed to fully close after lifting.

I ryj i The valve was isolated and placed out of service (T.S.3.4.9.3).

At 1540 RC-402-

_j ERV was returned to service. The redundent power operated relief remained l

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0g operable during the event. Tnis is not a repetitive occurrence.

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decreased from approximately 260 to 220 psia during thir event.

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opportunity during the unit startuo.

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% POWER OTHER STATUS 015 O RY DISCOVERY DESCRIPTION

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avis /M. J. Miernicki (301) 234-7942/7962 NAME CF PREPARER _

PHONE:

LER N0. 79-20/3L DOCKET NO. 50-317 EVENT DATE 7-6-79 REPORT DATE 7-19-79 ATTACHMENT CAO E DESCRIPTION AND CORRECTIVE ACTIONS:

(CONTINUED) was stroked several times satisfactorily and returned t'o service.

(Dresser Type 31533VX-30) l