05000254/LER-1981-010-03, /03L-0:on 810414,valve AO-1-1301-35 Observed Closed Causing Reactor Core Isolation Cooling to Be Inoperable.Caused by Shorted Solenoid Coil on Valve Operator.Solenoid Replaced.Valve Tested Satisfactorily

/03L-0:on 810414,valve AO-1-1301-35 Observed Closed Causing Reactor Core Isolation Cooling to Be Inoperable.Caused by Shorted Solenoid Coil on Valve Operator.Solenoid Replaced.Valve Tested Satisfactorily

ML20008F993
Person / Time
Site:	Quad Cities
Issue date:	04/27/1981
From:	Weinfurter E COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20008F992	List: 05000254/LER-1981-010, Forwards LER 81-010/03L-0 05000254/LER-1981-010-03, /03L-0:on 810414,valve AO-1-1301-35 Observed Closed Causing Reactor Core Isolation Cooling to Be Inoperable.Caused by Shorted Solenoid Coil on Valve Operator.Solenoid Replaced.Valve Tested Satisfactorily
References
LER-81-010-03L, LER-81-10-3L, NUDOCS 8105120470
Download: ML20008F993 (2)

LER-1981-010, /03L-0:on 810414,valve AO-1-1301-35 Observed Closed Causing Reactor Core Isolation Cooling to Be Inoperable.Caused by Shorted Solenoid Coil on Valve Operator.Solenoid Replaced.Valve Tested Satisfactorily

Event date:
Report date:
2541981010R03 - NRC Website

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8 EVENT DESCRIPTION AND PROBABLE CoNsECUENCEs h At 2200 the unit operator observed valve A0-1-1301-35 to be closed due to a shorted [

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LER NUMBER: LER/R0 81-10/03L-0 ll.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit One IV.

DOCKET NUMBER: 050-254 V.

EVENT DESCRIPTION

On April 14, 1981, at 2200, while Unit One was in the RUN mode at 809 MWe and 2489 MWt, the Unit One Operator observed that the outboard Reactor Core isolation Cooling system (RCIC) steam line drain valve, A0-1-1301-35, was closed. This valve is normally open to drain condensed steam from the line, preventing a water slug from forming and damaging' the RCIC turbine during startup. The steam line can still be drained, using a pressure test point between the inboard and outboard valves, to the area sump. A manual isolation valve on a RCIC steam trap also required repacking, so the RCIC system was taken out of serv!ce to facilitate repair of these items.

In accordance with Technical Specification 3 5.E.2., the High Pressure Coolant injection system (HPCI) was tested and proven operable before RCIC was taken out of service.

In 1979, two similar failurcs of the solenoid coil on Unit Two RCIC steam drain line were reported.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The consequences of this occurrence were minimized because the HPCI system was always available had the need arisen.

Vll. CAUSE:

The cause of the valve closure was a shorted coil in the valve operator solenoid (50-1-1301-35). This is a 120 VDC coll, part number 98-824-7-D, manufactured by ASCO.

Vill. CORRECTIVE ACTION:

Immediate corrective action was to demonstrate the operability of the HPCI i

system. Work Request Q12065 was issued to replace the solenoid coll, part for part.

The valve was test operated three :Imes satisfactorily. The RCIC system was declared operable at 4:05 a.m. on April 15, 1981.

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