05000346/LER-1981-020-03, /03L-0:on 810324,valve CV5011A,on Containment Air Sample Inlet Line to Hydrogen Analyzer,Would Not Stroke Closed W/Monitor Operator.Caused by Badly Worn Tripper in Motor Operator.Tripper Levers Replaced

/03L-0:on 810324,valve CV5011A,on Containment Air Sample Inlet Line to Hydrogen Analyzer,Would Not Stroke Closed W/Monitor Operator.Caused by Badly Worn Tripper in Motor Operator.Tripper Levers Replaced

ML20003G171
Person / Time
Site:	Davis Besse
Issue date:	04/23/1981
From:	Oneill J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20003G168	List: 05000346/LER-1981-020, Forwards LER 81-020/03L-0 05000346/LER-1981-020-03, /03L-0:on 810324,valve CV5011A,on Containment Air Sample Inlet Line to Hydrogen Analyzer,Would Not Stroke Closed W/Monitor Operator.Caused by Badly Worn Tripper in Motor Operator.Tripper Levers Replaced
References
LER-81-020-03L, LER-81-20-3L, NUDOCS 8104280420
Download: ML20003G171 (2)

LER-1981-020, /03L-0:on 810324,valve CV5011A,on Containment Air Sample Inlet Line to Hydrogen Analyzer,Would Not Stroke Closed W/Monitor Operator.Caused by Badly Worn Tripper in Motor Operator.Tripper Levers Replaced

Event date:
Report date:
3461981020R03 - NRC Website

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EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 l OIP-33-81-20) on 3/24/81 at 1325 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.041625e-4 months <br /> durine the performance of the Miscellaneous f

o 3 l Valves Quarterly Test ST 5099.08, CV5011A could not stroke closed. This valve is on 1 l the containment air sample inlet line to the H9 analyzer.

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4J 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l The cause was a badly worn tripper in the motor operator.

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v TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-20 DATE OF EVENT: March 24, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Failure of Containment Hydrogen Sample Line #4 Isolation Valve CV5011A The unit was in Mode 1 with Power (MWT) = 2508 Conditions Prior to Occurrence:

and Load (Gross MRE) = 843 Description of Occurrence: On March 24, 1981 at 1325 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.041625e-4 months <br />, during the performance of the Miscellaneous Valve Quarterly Test ST 5099.08, CV5011A would not stroke CV5011A is located outside of containment on the closed with its motor operator.

inlet line to the hydrogen analyzer.

This placed the unit in the action statement of Technical Specification 3.6.3.1, Containment Isolation Valves, which states that CV5011A must be operable with a maximum isolation time of fifteen seconds. Pursuant to this action statement, CV5011A was immediately shut using the hand operator and its breaker was de-energized to ensure the valve remained in its safety position.

Designation of Apparent Cause of Occurrence:

Under Maintenance Work Order 81-1889, the operator for CV5011A was inspected.

It was discovered that one tripper was There are two trippers and cams badly worn and was not riding on its tripper cam.

which disengage the manual operator and allow the motor operation of the velve.

With one disengaged from its cam, the operator could not reliably shift from hand operation to motor operation. The tripper had been installed in the proper manner but was sliE tly out of adjustment which caused the wear.

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There was no danger to the health and safety of the public Analysis of Occurrence:

or to station personnel. CV 5011A was immediately shut, isolating its containment penetration.

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Corrective Action

Under Maintenance Work Order 81-1889, the tripper levers were replaced. On March 26, 1981, ST 5064.01 was performed on CV5011A and the valve was l

declared operable at 1210 hours0.014 days <br />0.336 hours <br />0.002 weeks <br />4.60405e-4 months <br />. This removed the unit fre the action statement of Technical Specification 3.6.3.1.

Failure Data: No previous failures of this type have been reporced.

l LER #81-020 I