05000265/LER-1980-024-03, /03L-0:on 801010,valve MO-2-1-1001-34A Would Only Open Far Enough to Give Dual Position Indication.Caused by Limit Switches on Valve Operator Being Out of Adjustment. Limit Switches Adjusted & Control Switch Cleaned

/03L-0:on 801010,valve MO-2-1-1001-34A Would Only Open Far Enough to Give Dual Position Indication.Caused by Limit Switches on Valve Operator Being Out of Adjustment. Limit Switches Adjusted & Control Switch Cleaned

ML19339B919
Person / Time
Site:	Quad Cities
Issue date:	10/23/1980
From:	Kehret D COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19339B918	List: 05000265/LER-1980-024, Forwards LER 80-024/03L-0 05000265/LER-1980-024-03, /03L-0:on 801010,valve MO-2-1-1001-34A Would Only Open Far Enough to Give Dual Position Indication.Caused by Limit Switches on Valve Operator Being Out of Adjustment. Limit Switches Adjusted & Control Switch Cleaned
References
LER-80-024-03L-04, LER-80-24-3L-4, NUDOCS 8011100439
Download: ML19339B919 (2)

LER-1980-024, /03L-0:on 801010,valve MO-2-1-1001-34A Would Only Open Far Enough to Give Dual Position Indication.Caused by Limit Switches on Valve Operator Being Out of Adjustment. Limit Switches Adjusted & Control Switch Cleaned

Event date:
Report date:
2651980024R03 - NRC Website

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8 60 61 DOCKET NUYSER 68 88 EVENT QATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lO 2l l While performing the monthly RHRS Containment Cooling Valve Operability Test, QOS l

1000-5, valve MO-2-1001-34A would only open far enough to give dual position in-l

gl dication. The valve worked properly af ter the third attempt was made to open it.

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06 37 40 ' 48 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTICNS h Ii 10 l l The 1imit switches on the valve operator were out of adjustment. The 1imit switches l

ii j i l l were adjusted and the control switch was also cleaned. The valve was stroked three 1

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LER NUMBER: LER/R0 80-24/03L-0 11.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill.

FACILITY NAME: Unit Two IV.

DOCKET NUMBER: 050-265 V.

EVENT DESCRIPTION

While performing the monthly RHRS Containment Cooling Valve Operability Test, QOS 1000-5, valve MO-2-1001-34A would open only far enough for a dual indication light. MO-2-1001-34A worked properly after the third attempt to open it.

VI, PROBABLE CONSEQUENCES OF THE OCCURRENCE:

Valve M0-2-1001-34A is normally closed unless the need for containment cooling arises. The failure of MO-2-1001-34A to open made the "A" loop of the suppression pool cooling and spray system inoperable. The redundant "B" suppression pool cooling loop was available and operable.

Vll. CAUSE:

The cause of the event was attributed to the limit switches on MO 1001-34A being out of adjustment. MO-2-1001-34A was manufactured by Crane Company.

Vill. CORRECTIVE ACTION:

The limit switches for M0-2-1001-34A were adjusted. The control switch in the Control Room was also cleaned. The valve was stroked three times satisfactorily.

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