05000295/LER-1978-121-03, /03L-0 on 781101:MSIV 1D from Train a Did Not Close When Signal Was Removed,Caused by Relay Plunger Sticking

/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: 05000295/LER-1978-121, Forwards LER 78-121/03L-0 05000295/LER-1978-121-03, /03L-0 on 781101:MSIV 1D from Train a Did Not Close When Signal Was Removed,Caused by Relay Plunger Sticking
References
LER-78-121-03L, LER-78-121-3L, NUDOCS 7812210213
Download: ML20147E797 (1)

LER-1978-121, /03L-0 on 781101:MSIV 1D from Train a Did Not Close When Signal Was Removed,Caused by Relay Plunger Sticking

Event date:
Report date:
2951978121R03 - NRC Website

text

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

LICENSEE EVENT REPORT s

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LU bl DOCKE T NUl?BE n (H

8)J EVENT DATE 14 75 HkPOH T DATE liO 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.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11101l The safeguards sional sealing relay (clark cat. 6 4U d-120 ) fn 41 arl

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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 Train B.

No further action is required.

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