ML20150C703

/03L-0 on 780914:on a Phase a isolation,1FCV-PR24B & 1FCV-WD17A Failed to Close Placing Containment Isolation Sys in Degraded Mode.Caused by Asco 8320 Solenoid Valve Failing to Close Due to Oil in Instru Air

ML20150C703
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	10/13/1978
From:	Ugolini D COMMONWEALTH EDISON CO.
To:
Shared Package
ML20150C701	List: ML20150C698 ML20150C703
References
LER-78-094-03L, LER-78-94-3L, NUDOCS 7811240198
Download: ML20150C703 (1)

Text

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7' D 00 01 DOCK [, r NUML t H 03 0'> E.VE N T.D A T E i4 7b f u POH1 OA10 00 tvern otr,CnlPTION AND PROBABLE CONSEQUENCES h 1012.] L_.pn_a phase A isolzttinn__Ldue to an _ inadve rtnn e nn fa ty i r jo e ti em si.gn a l I lo l3; l 12 minutes after a reactor trip) , IFCV-PR2 4B and 1FCV-WD17A failed to _J g[ close , placing the containment isolation system in a degraded mode in j 10 l 1, ] [ violation of T.S . 3.9. 3. A. Previous LER's: 50- 304/78-51, 3.9 ; 50-295/78986, 1iTirl l 59,32,30,17. The health and safety of the public were not affected I l0 l7l l since the redundant valve to each failed valve was operable and closed I j o in j [ as required (lFCV-PR2 4 A, 1FCV-WD17B). l 7 8 9 80 SYST E M CAUOf CAU0E CO'P. VALVE CODE CODL SULCODE CO*.WONE NT CODE SudCODE buuCODE 10191 7 b IS 1 oJ@ l El@ IB l@ lV l A l LlV l OlP l@ lE 9 10 11 12 13 18 lb l@ l ZY l @

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40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTlONS h l i 101 l ASCO 8320 solenoid valves failed to close due to oil in i ns t rumen t ai r J p g ; Oil lodges on solenoid plunger where coil heat bakes it into a varnish, I l

,,,g; adhering the plungar to the plunger sleeve. The plungers were freed up l g,,,; and the valves were proven operable. The station is investigating the j j 1

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al e w.s N Aut Or Put ennEn._. David J. Ugolini pggyg 746-2084 X-347