05000265/LER-1980-023-03, /03L-0:on 801010,during LPCI Motor Operated Valve Operability test,MO-2-1001-29A Valve Initially Failed to Open Fully.Caused by Tightly Seated Valve Disc.Torque Switch Limits Adjusted to Allow More Time to Unseat Valve

/03L-0:on 801010,during LPCI Motor Operated Valve Operability test,MO-2-1001-29A Valve Initially Failed to Open Fully.Caused by Tightly Seated Valve Disc.Torque Switch Limits Adjusted to Allow More Time to Unseat Valve

ML19339C569
Person / Time
Site:	Quad Cities
Issue date:	11/06/1980
From:	Hannum D COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19339C564	List: 05000265/LER-1980-023, Forwards LER 80-023/03L-0 05000265/LER-1980-023-03, /03L-0:on 801010,during LPCI Motor Operated Valve Operability test,MO-2-1001-29A Valve Initially Failed to Open Fully.Caused by Tightly Seated Valve Disc.Torque Switch Limits Adjusted to Allow More Time to Unseat Valve
References
LER-80-023-03L-04, LER-80-23-3L-4, NUDOCS 8011180628
Download: ML19339C569 (2)

LER-1980-023, /03L-0:on 801010,during LPCI Motor Operated Valve Operability test,MO-2-1001-29A Valve Initially Failed to Open Fully.Caused by Tightly Seated Valve Disc.Torque Switch Limits Adjusted to Allow More Time to Unseat Valve

Event date:
Report date:
2651980023R03 - NRC Website

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8 to el DOCK ET NUMSER 68 69 EVENT OATE 74 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h LO.L2.j l While performing LPCI Motor Operated Valve Operability Test, QOS 1000-3, MO-2-1001-29Al C

l valve initially failed to open fully. The probable consequences were minimal. Both l

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LER NUMBER: LER/R0 80-23/03L ll.

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

DOCKET NUMBER: 050-265 V.

EVENT DESCRIPTION

On October 10, 1980, while performing Unit Two LPCI Motor Operated Valve Operability Test, QOS 1000-3, MO-2-1001-29A valve failed to fully open initially. The initial failure of this valve to fully open made the LPCI mode of RHR inoperable. Technical Specification 3.5.A.5. outlines the necessary actions to be taken in the event the LPCI mode of RHR is found inoperable. The valve opened enough to give dual Indication on Control Room panel 902-3 Upon closing the valve, the open light immediately went off. Successive attempts to open the valve proved successful. After opening the valve, the valve was tested satisfactorily three times.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The probable consequences of this event are minimal.

Both core spray subsystems, the containment cooling mode of F.HR, and the diesel generators required for operation of these components were operable during the event.

The MO-2-1001-29A valve was found to operate satisfactorily immediately after the event.

V!l. CAUSE:

MO-2-1001-29A gate valve disc was seated tightly. When attempting to open the valve the torque switch on the moto operator closed and shut off the motor operator. Thus, the valve failed to go fully open.

Vill. CORRECTIVE ACTION:

The limits on the motor operator were reset so that the valve would ride on the bypass longer; thus, the motor operator would have more time to pull the valve disc off the valve seat.