ML20062G279

LER#78-043/03L-1 on 780609:procedure HNP-1-3902,Safety Relief Valve Functional Test Tried Unsuccessfully on 2 Solenoids.One Failed Due to Bent Plunger;Other Failure Due to Plunger Not Properly Secured to Actuating Springs

ML20062G279
Person / Time
Site:	Hatch
Issue date:	06/30/1978
From:	Thomas Greene GEORGIA POWER CO.
To:
Shared Package
ML20062G277	List: ML20062G272 ML20062G279
References
LER-78-043-03L, LER-78-43-3L, NUDOCS 7812270285
Download: ML20062G279 (2)

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EVENT DESCniPTioN ANO pnODARLE CONSECUE*:CES Oc3ET 2.u w nuCaT OarE .I1

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g lWith the reactor in cold shutdown onh Procedure H.'IP-1-3902, " Safety Relief o-30-78, I l

'g ; Valve Functional Test," was attempted unsatisfactorily cn B21-F013C and B21-F013L to I i

g , functional test the solenoids installed per CCR 78-9. The solenoids had not creviousivl  !

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g ,been in service, and since the SRV's are not required to be acerable while the reactor i I i

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,T61 l s in cold shutdown, the SRV solenoids were not required to be ooerable and there was I ,

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.g ;no significance in.the failure of the SRV solenoid valves at the time of testino. I T51 IThis is a non-repetitive occurrence. l

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33 3/ 4J 43 42 43 44 47 CAuSE DESCRIPTION AND CORRECTIVE A0TICNS h i t, ; pf the eleven Target Rcck D. C. actuated solenoid valves tested. only two failed. One 1  :

g ; failed from its plunger being bent out of adjustment and the other failed because its I plunger was not properly secured to the stem of the actuatina scrinas. Althouch nine i

.of the solenoid valves passed the functional test and were found coroletely operable.

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7 ;seven were found not to have the required locktite on the threads of the (cont. P. 2) r '

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N AP.tE OF PREPARLil Tom Greene, Suot. of Plt. Eng. Serv. (912) 367-7731 Ext.121 2 PHCNE: 3

.cgia Power Company

. ant E. I. Hatch Bax. ley, Georgia 31513 l

Reportable Occurrence Report No. 50-321/1978-43 Cause Description and Corrective Actions (continued)

I solenoid plungers.

The failure of the two solenoids and lack of locktite

on seven solenoids can be contributed to poor QC control on the part of the solenoid manufacturer. All eleven SRV solenoid valves were removed, disassembled, i

cleaned, and readjusted or replaced as deemed necessary by the Tcrget Rock a

factory representative. The SRV solenoid valves were bench-tested, remounted, t

and retested satisfactorily with no further action required.

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