ML19321A508

LER 80-033/03L-0:on 800620,w/reactor Operating at Power, Reactor Dewpoint Exceeded Limits.Caused by Moisture Ingress Occurring During 1A Circulator buffer-mid-buffer Upset & Circulator Trip

ML19321A508
Person / Time
Site:	Fort Saint Vrain
Issue date:	07/18/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19321A506	List: ML19321A505 ML19321A508
References
LER-80-033-03L, LER-80-33-3L, NUDOCS 8007230539
Download: ML19321A508 (1)

Text

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• NRC FORM 366 U. S. NUCLEA') REGULATOGY COMMISSION (7 77)

LICEN3EE EVENT REPORT l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL BLOCK: l i

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lh 8 9 lClOlFISlVl1l@l0lO!-l0l0l0l0l0l-l0l0l@l4l1l1l2l0l@l LICENSEE CODE to 15 LICENSE NUMSER 25 26 LsCENSE TYPE JG l

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CON'T 10l11 5c ,"et l L@l 0] 5 l 0l 0 ! 0l 2] 617 @l 016 l 2 l O l 8 l 0 74@l 0 75 l 7 REPORT l 1 l CAT R El n l n30 l@

i 8 60 St COCK ET NuYagR 68 69 EVENT DATE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h tol2l l On June 20, and again on June 30, 1980, with the reactor operating at power, reactor l

, o ,3 i l dewpoint exceeded the limits of LCO 4.2.11, Figure 4.2.11-1. Degraded mode of LCO l l o ! 4 I l 4.2.11. Reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2. No af- I l o i s 1 [ feet on public health and safety. Similar occurrences reported in RO 76-06, 77-02. I I o is l l 7 7-13, 78-16, 78-39, 79-31. 79-43. and 80-19. I l o ! 71 I l 10181 l 40 I

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$YSTE M CAU$$ CAUSE COMP. VALVE CCOE CCCE SUSCCOE COYPONENT CCDE SU8COCE SUSCCCE 10191 l Cl Bl@ Laj@ I z l@ l zl zl zl zl zl zi@ Lz_J@ l zl@ 23 7 6 9 10 11 12 13 18 '9 SEQUENTIAL OCCUR R E NCE REPCRT R EVISION ggR mo EVENT YE AR R EPORT No. CCCE TYPE No.

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33 l -l 31 lo l 32 N A CN CN PLANT VE HOLAS S B i PCR 8. SL PDLI E MANUP CT RER lXl@lZl@ l3l@

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CAUSE DESCRIPTION AND CC ARECrlVE ACTIONS ii loll Increase in primarv coolant moisture and reactor dewnoint is being attributed to a l I i l i l I moisture ingress which occurred during LA helium etreulater buffer-mid-buffer unser 1

,, ,, I and subsequent circulator trip. Decrease in reactor power and cora outier temoers- I l,t3l l ture restored compliance with LCO 4.2.11 by 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on June 20 (Event #1) and bv l li14 i l 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on June 30 (Event #2). l 7 6 3 80 ST *LPCWER oTHER STATUS 315 RY DISCOVERY DESCRi8 TION 11 I = i l Cl@ l 0 l 2 l 5l@l N/A l l A l@l Review of Logs l ACTivifv COMTENT aELEAsEo CP=ELEAsE LOCAfioN CP RELEASE @

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$ 3 l Zlh 10 l N/A AUouNT CF ACTIVITY l N/A 45

@l l tt 44 80 PER$0NNEL EXPCsuRES NUM6ER TYPE C ESCRIPTICN I i 17 l l 01 01 Ol@l Zl@l N/A *l

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NuveER cEsCRiPTioN@

li !4 5l l2 0l Ol 0l@l N/A 7 11 12 l

30 LOSS OF CR DAMAGE TO PACILITY Tv*E D E SCRIPTION W l 8Zl@

7 9 l N/A to 40 l

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126,1lNf@iELP1,eN@ l N/A 8007230  % i NRC USE ONLY 1 ! l l I l l I i l f I30l];

7 3 3 to 68 69 NAME OP PREPARER " PwCNE: (303) 785-2253 S,

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