ML19323H667

LER 80-024/03L-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

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: ML19323H665 ML19323H667
References
LER-80-024-03L, LER-80-24-3L, NUDOCS 8006160031
Download: ML19323H667 (1)

Text

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? $ 50 61 QoCKET NUMBER 68 69 EVENT Q ATE 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. This is a decraded mode off l o 17 l l LCO 4.4.1, Table 4.4-3 and is reportable oer Fort St. Vrain Technical Soecification l I

l0lei l AC 7.5.2(b)2. a0 7 s, SYSTEM CAUSE CAUSE COM P. VALVE CCOE CCCE SUSCODE COMPCNENT CODE SUSCODE SUSCOQE lol31 7 4 l Cl Bl@ Wh Wh I VI Al Liv lE lX lh l Slh l Zlh 3 10 11 12 13 18 19 20 SECL'ENTI AL CCCURRENCE REPCRT REVISION EVENT YE A R REPORT No. CCCE TYPE No.

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44 47 CAUSE CESCRIPTION AND CCARECTIVE ACTICNS l i l o l ( Cause o f the equilization valve beine ooen is not known, and no carticular activity l lt iijlcan account for the condition. Equalizing valve closed and 1C circulator buffer I g,,7i l helium dif ferential pressure returned to normal. I It 131 l l

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