ML20147E797

/03L-0 on 781101:MSIV 1D from Train a Did Not Close When Signal Was Removed,Caused by Relay Plunger Sticking

ML20147E797
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	12/01/1978
From:	Melnicoff M COMMONWEALTH EDISON CO.
To:
Shared Package
ML20147E783	List: ML20147E779 ML20147E797
References
LER-78-121-03L, LER-78-121-3L, NUDOCS 7812210213
Download: ML20147E797 (1)

Text

"HC F OM %G U. S. NUCLEAR RLGULATOHY COMMISSION (7 71)

, s LICENSEE EVENT REPORT gDNTROL DLOCK: l l' l l I l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo l t l lI l Llz b lg l 1l@l 0 lo l _ l olLICEf 0 SE loNUMdEH l o lo l_l0lol@l4 l 3 LICENSE 26 26 l1 l 3TYPE l3 JVl@lbl LAIl b6l@

7 8 9 LICENSEE CODE 14 15 d CON'T lol11 a nll L l@l o i s l 010 1012 19l Sl@lillIoIll71R l@l1 l ? ln l 1 l7 lnl@

14 75 HkPOH T DATE liO 7 8 LU bl DOCKE T NUl?BE n (H 8)J EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo121lDuring actuation testing of MSIV 10 from Safeauards Train B, it closed. I lolal Ibut then reocened when sional was removed. When tested from Tr2_4n A, I lo la i Ithe MSIV remained closed when signal was removed.Thus nroner auto l

[Opsil actuation by both trains as required by Tech. Spec. Table 3.4-1 was not l Io lo l l accomplished. However, the health and safety of the oublic was not I lo17llaffected as Train A was operable and would have actuated the MSIV I

ioisil properly in the event of an actual signal. I 80 7 8 9 .

CE CO E SLBCO E COMPONENT CODE SLOC DE SU E lol9l 7 8 l ClD l@ l I]@ l B l@ l R lE l L l Al Y lX l@ l Al@ l 20Zl @

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_ SEOVENTI AL OCCURRENCE REPCRT REVISION ggp ng EVENT YE Aft REPORT NO. CODE TYPE NO.

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11101l The safeguards sional sealing relay (clark cat. 6 4U d-120 ) fn 41 arl +n l lijij l latch when energized, allowing the MSIV to reopen when the sianal was I removed. This was due to relay plunger sticking. The relay was cleanedp i,i3i l lubricated, and exercised. Then MSIV 1D was retested successfullv from I i1 i.iil 7 g g Train B. No further action is required.

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s 5  % POWE R OTHER STATUS ISCO HY DISCOVERY DESCRIPTION IiIsi IC l@ p l 0 l 0l@l NA l l Cl@l Operator Observation l ACTIVITY CONTENT Rf LE ASED OF RE LEASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE I1 l c ] (_Zj (E) [,Zj@l NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL TXPOSUHES NUMOE R TYPE DESCRIPTION l t I y l 10 l 0 LoJ@l zl@l NA l PEnSOmE"mu'Jits N uen t. n oEcCniPriON@

li lx 18 010 l 0 l 0l@l12 NA l 7 11 80 1 OSS OF Olt DAMAGE TO F 4CILITY Q TYPE DE SC4tPilON  %/

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NAME OF ritEPARER M. A. Melnicoff PHONE .312 /7 4 6-20 8 4 E,

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