ML20009E791

LER 81-032/03L-0:on 810619,reactor Coolant Leak Detection Air Sampling Sys C-19 Declared Inoperable.Caused by Valves Sticking in Closed Position Due to Dirt in Sys Check Valves. Valves Disassembled & Cleaned

ML20009E791
Person / Time
Site:	Pilgrim
Issue date:	07/20/1981
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009E790	List: ML20009E789 ML20009E791
References
LER-81-032-03L, LER-81-32-3L, NUDOCS 8107280447
Download: ML20009E791 (1)

Text

I NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: l t

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) {

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80 EVENT DESCRIPTION ANO PROS ABLE CONSEQUENCES h io l2l l On June 19, 1981 at 1445 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.498225e-4 months <br />, the Reactor Coolant Leak Detection Air Sampling l

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System (C-19) was declared inoperable. Instrument and Control personnel were l l l

Io l4l l immediately dispatched to repair the unit. During the event the drywell sumos l [

i l0 is j l were operable. C-19 was repaired and returned to service at approximately 2032 I i ggI hours on the same day. The unir. has operated satisfactorily since rhnt t-i mo . l i

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ji 10 l l This event was caused by dirt in the system check valves which caused the valves  !

[i )i l l to stick in the closed position. The check ,alves were dinn==nmhind <lonnna I g,,7i l and reassembled. This is an isolated event. I Ii1311 ..

I l i 14 1l 80 7 8 9 ST S  % POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION 11 15 l l E j@ l1 l 0 l0 l@[ N.A. l lAl@l Operational Event -

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7 8.t NAME OF PREPARER M. T. McLoughlin pgOyg. 6 U-M4W 2

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