05000267/LER-1980-024-03, /03L-0:on 800512,at 47% Thermal power,1C Circulator Seal Differential Pressure Decreased Significantly Due to Unknown Causes.Equalizing Valve Closed & 1C Circulator Buffer Helium Pressure Returned to Normal

/03L-0:on 800512,at 47% Thermal power,1C Circulator Seal Differential Pressure Decreased Significantly Due to Unknown Causes.Equalizing Valve Closed & 1C Circulator Buffer Helium Pressure Returned to Normal

ML19323H667
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/06/1980
From:	PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19323H666	List: 05000267/LER-1980-024, Forwards LER 80-024/03L-0 05000267/LER-1980-024-03, /03L-0:on 800512,at 47% Thermal power,1C Circulator Seal Differential Pressure Decreased Significantly Due to Unknown Causes.Equalizing Valve Closed & 1C Circulator Buffer Helium Pressure Returned to Normal
References
LER-80-024-03L, LER-80-24-3L, NUDOCS 8006160031
Download: ML19323H667 (1)

LER-1980-024, /03L-0:on 800512,at 47% Thermal power,1C Circulator Seal Differential Pressure Decreased Significantly Due to Unknown Causes.Equalizing Valve Closed & 1C Circulator Buffer Helium Pressure Returned to Normal

Event date:
Report date:
2671980024R03 - NRC Website

text

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50 61 QoCKET NUMBER 68 69 EVENT Q ATE 74 75 REPORT DATE do EVENT DESCRIPTION AND PRCSABLE CONSEQUENCES h Ioi2IlOn Mav 12, 1980, while operating at 47% thermal never and 140

'.%' electrical acuer.

I t o 13 l [ operations eersonnel observed that the IC circulator seal dif ferential oressure de-1

[ o l A l I creased significantly. The circulator seal differential pressure had been lower than l I o I s J l normal for several days.

Instrument eersonnel investigated the oroblem and found an l I o le 1 l instrument ecuilization valve aporoximatelv one turn open.

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