ML19241B897

LER 79-020/03L-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

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: ML19241B891 ML19241B897
References
LER-79-020-03L-01, LER-79-20-3L-1, NUDOCS 7907250298
Download: ML19241B897 (2)

Text

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a.m LICENSEE EVENT REPORT CONTR ol block:

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(PLEAOE PRINT OR TYPE ALL REQUIRED INFORMATioN) 7 o i 8 9 MlDlClClNi1lgt0l0 LICENSEE GC; 15 l0 0l0l0l0l-l0l0l@l4 UCENSE NUMSER 25 26 1LICENSE l 1 l TT1PEi lJOl@l$7 CAT l 58 l@

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EVENT DATE 74 75 REPORT DATE 80 7

60 61 DOCK ET NUM6E R 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 io s ERV was returned to service. The redundent power operated relief remained l 0g operable during the event. Tnis is not a repetitive occurrence. RCS pressure g aj. decreased from approximately 260 to 220 psia during thir event.  ;

I D. Ti.) 80 r g g SYSTEM CAUSE CAUSE COMP. VALVE CODE CCCE SUSCOr2 COMPONENT CODE SUB2CDE SUBCODE o ., i l C l B lg lE @ Q j @ l Vl Al Ll Vl El X @ [Hj g @ @ 20 7 , 9 10 11 12 13 td 19

_ SEQU ENTI AL OCCURRENCE REPORT REVISION LE R RO EVENT YEAR R EPORT NO. COCE TYPE NO.

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31 4 41 e u CAL'SE DESCFitPT1oN AND CORRECTIVE ACT:oNS 47 o 180th pressurizer Dower coerated relief valvat wara diveblad and -ndifiad du, inn I

!, y ghe recent refueling outage. Since it was not possible to stroke test ths valves i

, j without the reactor coolant system pressurized, this test was performed earliest

,, ,  ; opportunity during the unit startuo. RC _402-ERV f ailed to fully clot

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,and was isolated. The pilot valve stroke w; m 'iusted and the relief vaive J.oNT) l 7 8 9 80 STA  % POWER OTHER STATUS 015 O RY DISCOVERY DESCRIPTION

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NA 44 l l B l@l Operator Observation l 7 12 11 45 46 80 RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE i 6 [.Z_j @ [_Z_j@l NA - l l NA _J 7 8 9 10 11 44 45 80 PERSONNEL CxPOSURES 1- .. ~ NUMBER TYPE DESCRIPTION 39 .

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I' "!1PERSame't mJu' dies NUM B E R D E SCRiPTt ON 1

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LOSS OF OR OAMAGE TO F ACILITY 43 j f TYPE DESCRIPTION ] g$' "r7

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fM l l l l 1 l l 1 I I I I I,I 2 o ISSU2D@DE lNl l CRIPTION NA l 7 8 9 10 68 69 80 S

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

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

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