ML20002A785

LER 80-057/03L-0:on 801004,PCRV Pressure Exceeded Penetration Interspace Pressure.Caused by Malfunction of Pressure Switch.Pcrv pump-up Terminated & Switch Linkage Retightened & Calibr

ML20002A785
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/31/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20002A783	List: ML20002A782 ML20002A785
References
LER-80-057-03L, LER-80-57-3L, NUDOCS 8011210552
Download: ML20002A785 (1)

Text

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' D RCN POR4A 386 U.S. NUCLEAR REtULAT%Y COfitelSSION Wm ~ ,,

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74 7s REPORT OATE do 8 8 60 61 DOCKET NuusER EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h A 1 At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> on October 4,1980, with the plant operating at 7% thermal power, PCRV l FTTl I pressure exceeded penetration interspace pressure due to malfunction of the pressure f l o 4 l switch controlling interspace pressurization. This constitutes a degraded mode of I t o i s ; i a 4.2.7 and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2. [

t o is l l Mo accompanying occurrence or probable consequences. No affect on public health or l l

l o I 7 I I safety.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

l i j o l l A Mercoid pressure switch, model DA-23-3, failed to perform its intended function in l f

g (monitoring PCRV penetration interspace pressure due to loose linkage on tFie Bourden tube connection to the switch. PCRV pump-up was terminated, the switch linkage was l

,,,,, g retightened, and the switch caliSrated per approved precedure. Proper pressure dif- l g

ferential was re-established.  ;

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NRC USE ONLY ,

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PHONE: (303) 785-2253 g NAME OF PREPARER ,-

8011210552

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