ML20050L193

LER 82-003/01T-0:on 820314,unplanned Dilution of RCS Resulted When Operators Were Trying to Restore Shutdown Cooling Flow.Caused by Two Manual Valves Being Partially Open Simultaneously While One Being Opened & Other Closed

ML20050L193
Person / Time
Site:	San Onofre
Issue date:	03/30/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20050L181	List: ML20050L180 ML20050L186 ML20050L193
References
LER-82-003-01T, LER-82-3-1T, NUDOCS 8204140273
Download: ML20050L193 (1)

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REPORT DATE EVENT DESCAlPTION AND PROB ABLE CONSEQUENCES h a 2 I With the plant in Mode 6, an unplanned dilution of the Reactor Coolant I l o 131 l System occurred while operators were attempting to restore shutdown I lojalI cooling flow. RCS boron concentration remained above Technical I lo lel l Specification limits throughout the event, thus public safety was l IOic_]1 not endangered. I o 7 I I I

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. cAUSE DESCAiPTION AND CORRECTIVE ACTIONS ,

IiIoiI While attempting to restore pump flow, one operator opened the Refuelinct li li l I Water Storace Tank Suction Line Manual valve while another was closina i While the valves were both partia11M A] the RCS Suction Line Manual Valve.

lil3ll open, water was added to the RCS. A caution statement will be added tol 11 121 l the Onerating Procedure for the Shutdown Cooling System. l

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