05000333/LER-1979-073-03, /03L-0:on 790914,while Conducting Operations Surveillance Test,Emergency Diesel Generator C Tripped on Overspeed During Engine Start Sequence.Caused by Loose Connection in Overspeed Limit Switch.Repair Made

/03L-0:on 790914,while Conducting Operations Surveillance Test,Emergency Diesel Generator C Tripped on Overspeed During Engine Start Sequence.Caused by Loose Connection in Overspeed Limit Switch.Repair Made

ML19253B573
Person / Time
Site:	FitzPatrick
Issue date:	10/12/1979
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
ML19253B571	List: 05000333/LER-1979-073, Forwards LER 79-073/03L-0 05000333/LER-1979-073-03, /03L-0:on 790914,while Conducting Operations Surveillance Test,Emergency Diesel Generator C Tripped on Overspeed During Engine Start Sequence.Caused by Loose Connection in Overspeed Limit Switch.Repair Made
References
LER-79-073-03L, LER-79-73-3L, NUDOCS 7910160425
Download: ML19253B573 (2)

LER-1979-073, /03L-0:on 790914,while Conducting Operations Surveillance Test,Emergency Diesel Generator C Tripped on Overspeed During Engine Start Sequence.Caused by Loose Connection in Overspeed Limit Switch.Repair Made

Event date:
Report date:
3331979073R03 - NRC Website

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NAME OF PREPARER PHONE:

POWER AUTHORITY OF THE STATE OF NEW YORK J AMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 79-073/03L-0 Page 1 of I

During normal operation while conducting Operatior.s Surveillance Test F-ST-9B titled "EDG Full Load Test (ISI)" to satisfy the requirements of Technical Specifications Appendix A, Paragraph 4.9.B.1, Emergency Diesel Generator "C" tripped on overspeed during the engine start sequence.

The redundant Emergency Diesel Generators and off-site power systems were veri fied operable as required by Technical Specifications Appendix A, Paragraph 4.9.B.5 and 6.

Therefore, the event did not represent any signi ficant hazard to the public health and safety.

Investigation revealed that the overspeed limi t swi tch had a loose connection which resulted in the initiation of the overspeed trip due to normal engine vibration. No actual overspeed condition existed.

Repai r of the loose connection was completed and an overspeed test was conducted to verify proper operation and setting of the overspeed protection devices.

Following this work, Emergency Diesel Generator "C" was verified operable by satisfactory completion of F ST-9B and the of f-si te and on-si te AC power systems were restored to the normal stand-by line up on the followiog day.

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