ML20062C694

/01X-0 on 781023:during Inspec of Steam Generator Isolation Signal logic,21 Main Steam Isolation Valves Failed to Shut When Given Sgisa & Sgisb Signal.Cause Undetermined

ML20062C694
Person / Time
Site:	Calvert Cliffs
Issue date:	10/24/1978
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:
References
LER-78-036-01X, LER-78-36-1X, NUDOCS 7811130166
Download: ML20062C694 (1)

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EVENT DESCRIPTION AND PROBA8LE CONS EQUENCESh 10121 l At 22h5 during routine testih of ste generstor isolation sign _j g l (SGIS) logic, 21 main steam i n valve failed to shut as required l l o ,,i l by T.S.3.7.1.5 when given a SGISA and SGISB signal or with the hand l g , switch in the control room. The MSIV had to be shut by manually l

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