ML19283A393

LER 80-041/03L-0:on 800721,during Jul & Aug Testing of Helium Circulator Seal Malfunction Pressure Differential Switches,Settings Found to Be Less Conservative than Allowed.Caused by Dirt Accumulation in Electrical Switches

ML19283A393
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/22/1980
From:	PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19283A392	List: ML19283A390 ML19283A393
References
LER-80-041-03L, LER-80-41-3L, NUDOCS 8008260468
Download: ML19283A393 (1)

Text

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NRC FORM 368 U. S. NUCLEAR REGULATORY COMMISSION Q.77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 0 1 l9 C l UCENSEE 0 l F lCODE S l V l14 1 l@l 15 0 l 0 l- l UCENSE 0 l 0 NUMBER l 0 l 0 l 0 l- l 0 25! 0 l@l 26 4l ll 1lTYPE LICENSE 2l 0l@l JO l

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DOCKET NUMBER EVENT OESCRIPTION AND PROBA8LE CONSEQUENCES h o 2 l During July testing, one of the twelve helium circulator seal malfunction oressure I o 3 1 differential switch units was discovered to have a trip point outside the limits of l 3 0 4.4.1. Table 4.4-3. During August 's- testing, four of the twelve switch units n 4 o s were found to trip outside these limits. These are reportable oer Technical Scecifi- I o s I cation AC 7.5.2(b)1 and AC 7.5.2(b)2. No effect on public health or safety. Redun- l 0 7 l dant system available and operable. Similar reoorts are RO 77-47. Final. and Preliminl-a g l ary reports R0 78-27, 79-32, 79-56, 80-07, 80-16, 80-20, 80-26, and 80-34. l

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44 47 33 34 CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS 27 i o l I'IT Barton Model 289 pressure differential switches failed to actuate at trip point I i i I due to dirt accumulation in electrical switches. Affected switches re-adiusted to 1 i

2 l proper trip points. Trip settings being checked on a monthly basis . Redesien of I

, system being evaluated. ]

3 4 I i l 7 8 9 80

$T  % POWER oTNER STATUS 015 Q ERY OtSCOVERY DESCRl* TION 1 5 W@ l0 l 4 l0 l@l N/A l l Cl@l Operability Test l 7 8 1 12 13 44 45 46 80 RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 h l N/A l l N/A l PtRsoNNEL ExposOEs NuM8ER cEsCRipricN h 1 7 l O l O l O lh[ TYPE 3,jhlN/A l PERSONNEL INJu' IES NuM8ER oEsCRiPTioN@

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1 8 8 9 l O l O l O l@l 11 12 N/A 80 LOSS OF CR OAMAGE TO FACIUTY Q TYPE DESCRIPTION  %/

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'" NRC USE ONLY 46 ,

2 o issue I NI l 7@'"*c'EsCRi, h/A 4 6gTion @ i llIlittilistlj PHON E: 303) 785-2253 4 NAME OF PREP RER,-