ML19351F079

LER 80-072/03L-0:on 801117,three Helium Circulator Seal Malfunction Pressure Differential Switch Units Discovered to Have Trip Point Outside Tech Spec Limits.Caused by Dirt Accumulation in Electrical Switches.Switches Readjusted

ML19351F079
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/17/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351F080	List: ML19351F079 ML19354C400
References
LER-80-072-03L, LER-80-72-3L, NUDOCS 8012290442
Download: ML19351F079 (1)

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7 4 60 61 DOCK ET NuVgER es 69 EVENT DATE 74 7S REPORT QATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h lo!2l l During November tecting, three of the twelve helium circulator seal malfunction pres- I y o ,3 , g sure differential switch units were discovered to have a trip point outside the limits l io,,, ,of LCO 4.4.1, Table 4.4-3. These are reportable per FSV Technical Specifications l gg,3, 9 AC 7.5.2(b)1 and AC 7.5.2(b)2. No effect on public health or safety. Redundant sys- l

,o,,j g tem available and operable. Similar reports are RO 77-47. Final and Preliminary l

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,l3, l ITT Barton Model 289 pressure diff erential switches failed to actuate at trip point l g l due to dirt accumulation in electrical switches. Affected switches re-adjusted to l

,,,,,l proper trip points. Trip settings being checked on a monthly basis. Redesign of l

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