ML19352B166

LER 81-024/03L-0:on 810317,five Helium Circulator Seal Malfunction Pressure Differential Switch Units Had Trip Point Outside Tech Spec.Caused by Dirt Accumulation in Electrical Switches.Switches Readjusted

ML19352B166
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/16/1981
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19352B162	List: ML19352B161 ML19352B166
References
LER-81-024-03L, LER-81-24-3L, NUDOCS 8106030251
Download: ML19352B166 (1)

Text

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60 61 DOCKET NUMGER sd 69 EVENT D ATE 74 7S REPORT DATE do EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o i 21 j Durine March teneine. five of the *.r e lve hel4um eireilnene ammi -imi f tn c ei nn orpuuro l ITTTl I differential switch units were discovered to have a trio coint outside the limits of f 19141 1 LCO 4. 4.1. Table 4. 4-3. These are reoortable oer Fort St. Vrain Technical Soecifica- I No effect on public health or safety. Redun- I 10 I s l l tions AC 7. 5.2(b)1 and AC 7.5.2(b)2.

lo is l l dant systems available and operable. Similar reports are RO 77-47. FinaYnd Prelimi-l l o 17 I I nary reports RO 78-27, 79-32, 79-56, 80-07, 80-16, 80-20, 80-26, 80-34, 80-41, 80-51,I I o Ia i I 80-72, 81-C00, - '81-016. "

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43 44 47 CAUSE DESCAIPTION AND CORRECTIVE ACTIONS 27 1

I i l o l [ ITT Barton Model 289 oressure dif ferential switches f ailed to actuate at trio coint m idue to dirt accumulation in electrical switches. Af fected switches re- td4usted to I

i,i2i l proper trip points. Trip settings being checked on a monthly basis. Redesign of l l,i3l l system being evaluated. l l

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