05000333/LER-1979-091-03, /03L-0:on 791020,during Surveillance Test F-ST-2B, RHR Pump C Failed to Start Properly.When Pump C Was Started Pump Would Trip Following Release of Control Switch.Caused by Improper Adjustment of Switches

/03L-0:on 791020,during Surveillance Test F-ST-2B, RHR Pump C Failed to Start Properly.When Pump C Was Started Pump Would Trip Following Release of Control Switch.Caused by Improper Adjustment of Switches

ML19210D086
Person / Time
Site:	FitzPatrick
Issue date:	11/15/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19210D084	List: 05000333/LER-1979-091, Forwards LER 79-091/03L-0 05000333/LER-1979-091-03, /03L-0:on 791020,during Surveillance Test F-ST-2B, RHR Pump C Failed to Start Properly.When Pump C Was Started Pump Would Trip Following Release of Control Switch.Caused by Improper Adjustment of Switches
References
LER-79-091-03L, LER-79-91-3L, NUDOCS 7911200508
Download: ML19210D086 (2)

LER-1979-091, /03L-0:on 791020,during Surveillance Test F-ST-2B, RHR Pump C Failed to Start Properly.When Pump C Was Started Pump Would Trip Following Release of Control Switch.Caused by Improper Adjustment of Switches

Event date:
Report date:
3331979091R03 - NRC Website

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e POWER AUTHORITY OF THE STATE OF NEW YORK JAMESA.FITkPATRICKNUCLEARPOWERPLANT DOCKET N0. 50-333 ATTACHMENT TO LER 79-091/03L-0 Page 1 of 1 During normal operation while conducting Operations Surveillance Test, F-ST-2B, titled "RHR Pump Operability Test (ISI)", RHR pump C failed to start properly. The testing was being conducted to verify operability of components in the A LPCI loop following work on pipe supports which had required that the loop be administratively declared inoperable on October 18, 1979 and reported in LER 79-081.

Following the completion of the work described in LER 79-081, the components of the A LPCI loop were being tested to satisfy the requirements of Technical Specifications, Appendix A Paragraph 3.5.A.

The other LPCI loop, the core spray systems and the emergency diesel generators were operable in accordance with the requirements of the Technical Specifications. Therefore, the event did not represent a significant hazard to the public health and safety.

When RHR pump C was started, the punip would trip following release of the control switch.

Investigation revealed that during the time period in which the A LPCI loop had been declared inoperable, corrective and preventive maintenance had been performed on the C RHR pump suction valve (10-MOV 13C).

During this maintenance, the valve operator open limit switches had been adjusted to assure that valve travel in the open direction was terminated prior to the valve reaching its backseat. While this open limit switch was properly adjusted, another set of limit switches associated with the pump and valve interlock was not adjusted.

Failure to adjust this second set of limit switches, which are designated as spares in most cases, resulted in a pump trip as soon as the control switch was released since the interlock indicated that the valve was not fully open.

Following proper adjustment of the limit switches pump operability was demonstrated by satisfactory completion of F-ST-2B.

In addition, maintenance personnel attended a training meeting which discussed the event and the necessity to check proper operation of all valve operator position rotors (limit switches) when adjusting any of the valve position rotors.

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