ML20028F429

LER 82-170/03L-0:on 821214,review of Chart Recordings of RCS Cold Leg Temp Indicated Heatup/Cooldown Rate Limits Exceeded on Three Occasions.Caused by Inability to Properly Control Shutdown Cooling Sys Flow.Personnel Counseled

ML20028F429
Person / Time
Site:	San Onofre
Issue date:	01/13/1983
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20028F401	List: ML20028F400 ML20028F429
References
LER-82-170-03L, LER-82-170-3L, NUDOCS 8302010346
Download: ML20028F429 (1)

Text

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!al2l l While in Mode 5, a review of strip c rt recordings of RCS cold leg temperature ,

g3,3, , indicated that the RCS heatup/cooldown rate limits had been exceeded on 3 occassions. , 9 1o14l l Engineering evaluations indicated that the structural ~ integrity and fracture ,

,a33, i toughness margin were not compromised and normal pl' ant operations could proceed wilihout 10 l61 l restriction. There was no impact on the health and safety of plant personnel or the public'

[al7ll associated with these events.

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44 47 CAUSE DESCRIPTION ANo CORRECTIVE ACTIONS __

It I o I l The events were caused by inability to properly control Shutdown Cooling System (SCS) i ti1il l flow. Responsible Operations personnel have reviewed the circumstances and have been ,

i, 2i i directed to me.e closely monitor SCS flow and RCS heatup/cooldown operations. This ,

Li,,,ty,,) I will be included in their monthly retraining session. Additionaly, design modificatigns i . l to the SCS to allow better control of flow are planned to be completed during the firgt.

> s e retueling outage.

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WETHOD OF ST A NS smm OTHER STATUS 015CQvE RY DISCOVERY DESCRIPTIOas

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