05000317/LER-1981-012-03, /03L-0:on 810213,while Shifting from 1 to 2 Running Charging Pumps,Letdown Relief Valve CVC-345-RV Lifted & Failed to Reseat.Possibly Caused by Pressure Surge in Line.Valve Matls Review Being Conducted

/03L-0:on 810213,while Shifting from 1 to 2 Running Charging Pumps,Letdown Relief Valve CVC-345-RV Lifted & Failed to Reseat.Possibly Caused by Pressure Surge in Line.Valve Matls Review Being Conducted

ML19347D561
Person / Time
Site:	Calvert Cliffs
Issue date:	03/13/1981
From:	Davis S, Huseby D BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347D560	List: 05000317/LER-1981-012, Forwards LER 81-012/03L-0 05000317/LER-1981-012-03, /03L-0:on 810213,while Shifting from 1 to 2 Running Charging Pumps,Letdown Relief Valve CVC-345-RV Lifted & Failed to Reseat.Possibly Caused by Pressure Surge in Line.Valve Matls Review Being Conducted
References
LER-81-012-03L, LER-81-12-3L, NUDOCS 8103260612
Download: ML19347D561 (2)

LER-1981-012, /03L-0:on 810213,while Shifting from 1 to 2 Running Charging Pumps,Letdown Relief Valve CVC-345-RV Lifted & Failed to Reseat.Possibly Caused by Pressure Surge in Line.Valve Matls Review Being Conducted

Event date:
Report date:
3171981012R03 - NRC Website

text

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ioi31 Ivalve CVC-345-RV lifted and failed to reseat. Both letdown isolation i

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DPR-53 EVENT DATE 02-13-81 REPORT DATE 03-13-81 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEOUENCES At 1013 during normal operation, while shif ting from one to two running charging pumps, letdown relief valve CVC-345-RV lif ted and feiled to reseat. (TS. 6.9.1.9.d). The Operator shut letdown isolation valves CVC-515-CV and CVC-516-CV to isolate the relief valve. Reactor coolant inventory was maintained manually by intermittent use of the charging pumps. After the pressure decreased to O psig in the letdown line, CVC-345-RV closed. The chemical and volume control system was restored to normal operation at 1145. The health' and safety of the public was not affected. This is not a repetitive occurence.

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