ML20003B255

LER 81-005/03L-0:on 810107,during Surveillance Testing,Trip Setting on PDIS-21177 Bearing Water Differential Pressure Switch Found Below Tech Spec Limit.Caused by Instrument Drift.Switch Adjusted & Returned to Svc

ML20003B255
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/03/1981
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20003B244	List: ML20003B243 ML20003B255
References
LER-81-005-03L, LER-81-5-3L, NUDOCS 8102100556
Download: ML20003B255 (1)

Text

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60 61 OCC% ET wv8 E a M 69 E v ENT O ATE 74 75 A E80RT O ATE '3 EVENT OESCRIPTICN AND PROS ASLE CONSEOUENCES h I o I .' l b" pile cerfoming Surveillance Test S R 5. 4.1. 3. 3 c-R . the trio setting on PDIS-21177, j i;i3i ! beating water dif ferential pressure switch, was found below the linit of LCO 4.4.1, l lo641 l Table 4.4.3. Reportable ver Fort St. Vrain Technical Specifications AC 7.5.2(b)1 and l l , . 21 I AC 7. 5. 2 (b)2. The LCO specifies a trip setting of ecual to or greater than 475 ?SID l 13id i and the switch tripped at 380 ?SID. No ef f ect on public health or saf ety. No ac- l

[;i ! l Oonpat y ing occurrence. Redundant systems were available and operable. Similar eventq l3ia i ; were reported as RO 79-60 and R0 79-11. 80 l

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Ii! 1 l conservative than LCO 4.4.1 due to instrtinent drift. The switch was adiusted to te f i, j:1 l correct setpoint and returned to service. Surveillance Test successfully concleted. ;

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