ML20062C804

/01T-0 on 781023:during Routine Test of Steam Generator Isolation Signal logic,21 Main Steam Isolation Valve Failed to Shut Upon Sgisa & Sgisb Signal or Hand Switch in Control Room,Due to Sticking MSIV Solenoid Valves

ML20062C804
Person / Time
Site:	Calvert Cliffs
Issue date:	11/02/1978
From:	Davis S, Watkins K BALTIMORE GAS & ELECTRIC CO.
To:
Shared Package
ML20062C803	List: ML20062C800 ML20062C804
References
LER-78-036-01T, LER-78-36-1T, NUDOCS 7811140170
Download: ML20062C804 (2)

Text

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U. S. NUCLEA3 REGULATo".Y COMMISSION

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l 8 60 $1 DOCK E T NUMB ER EVENT OESCRIPTION AND PROB ABLE CONSEQUENCES h l l 0 l 2 l l At 22h5 during routine testing of steam generator isolation signal  ! l I

, pg77] g (SGIS) logic, 21 main steam isolation valve failed to shut as required l 1 by T.S.3.7.1 5 when given a SGISA and SGISB signal or with the hand l

, o 4 TTTI I switch in the Control Room. The MSIV had to be shut by manually I O s l operating a shutting solenoid on the valve block. LER 78-7 (U-2) l I

l l C l 7 l l describes a similar occurrence.

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di l42Yl@ 43 W@ lGI21Slol@ 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS h MSIV actuation solenoid valves vere found to be - I g lUpon investigation, f I i i l sticliing. A Facility Channe Beauest was innia-ented to mnaiey tha en1.

l g l enoid valves by replacing the solenoid with a higher strangth coil re i' (y 1 Vendor recomendation. The new coil was installed and the valve I I

i 4 1 returned to service. so 7 s 9 I

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• * '4 ATTACIDENT TO:

, LER NO. 78-36/lT DOCKET NO. 50-318 EVENT DATE 10-23-78 REPORT DATE 11-2-78 Upon investigationjof the MSIV actuation solenoid valves (Teledyne Republic Model

1. 21110-1202-5200, 125 VDc) were found to be sticking. A Facility Change Request was implemented to modify the solenoid valves by replacing the solenoid with a higher strength coil per Vendor recommendation. The new coil (Greer Hydraulics Part No. 309936) was installed and the valve returned to service. The remaining solenoid valves in Unit 1 and Unit 2 vill be modified as parts are available.

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