05000219/LER-1982-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl

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Forwards LER 82-057/03L-0.Detailed Event Analysis Encl
ML20064E844
Person / Time
Site: Oyster Creek
Issue date: 12/20/1982
From: Fiedler P
GENERAL PUBLIC UTILITIES CORP.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20064E846 List:
References
NUDOCS 8301060150
Download: ML20064E844 (3)


LER-2082-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
2192082057R00 - NRC Website

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. GPU Nuclear g g{ P.O. Box 388 Forked River, New Jersey 08731 609-693-6000 Writer's Direct Dial Number:

December 20, 1982 Mr. Ronald C. Haynes, Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Haynes:

Subj ect: Oyster Creek Nuclear Generating Station Docket No. 50-219 Licensee Event naport Reportable Occurrence No. 50-219/82-57/03L This letter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/82-57/03L in compliance with paragraph 6.9.2.b.2 of the Technical Specifications.

Very truly yours, 1 .

Peter B. Fiedler Vice President and Director Oyster Creek PBF:lse Enclosure s cc: Director (40 copies)

Of fice of Inspection and Enforcement U.S. Nuclear Regulatory Commission Was hington, D.C. 20555 Director (3)

Of fice of Management Information and Program Control U.S. Nuclear Regulatory Commission Washington , D.C. 20555 NRC Resident In spector Oyster Creek Nuclear Generating Station Forked River, NJ 08731 8301060150 821220 DR ADOCK 05000 GPU Nuclear is a part of the General Pubhc Utihtics System g@

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OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No.- 50-219/82-57/03L Report Date December 20, 1982 Occurrence Date November 18, 1982 Identification of Occurrence Operation in a degraded mode permitted by a limiting condition for operation as specified in the Technical Specifications, paragraph 3.8.C, when one isolation condenser loop was inoperable.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.2.

Conditions Prior to Occurrence Mode switch in RUN position l Thermal Power - 1005 MWt i Generator Load - 310 MWe l

l Description of Occurrence l On Thursday, November 18, 1982, at approximately 1450 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.51725e-4 months <br />, the electricians j , performing the backseating procedure for Emergency Condenser Return Isolation i Valve V-14-37 found the thread of the screw and backplate of one circuit on the terminal board stripped. This incident was immediately reported to the control ro om.

At approximately 1503 hours0.0174 days <br />0.418 hours <br />0.00249 weeks <br />5.718915e-4 months <br />, V-14-37 was placed in the closed position to

, isolate the condenser, and #2 isolation condenser was then declared i inoperable. Valve operability was performed on #1 isolation condenser to meet the requirements of Technical Specification 6.8.C.

The circuit breaker for V-14-37 was racked out and tagged out of service. The defective screw /backplate on the terminal block was replaced. Valve V-14-37 l was cycled for operability per Procedure 609.4.001 at approximately 1525 hours0.0177 days <br />0.424 hours <br />0.00252 weeks <br />5.802625e-4 months <br />

! and subsequently returned to service. Isolation condenser #2 was then placed back in service and the backseating of V-14-37 was resumed and completed sati sfact orily.

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Licensee Event Report Reportable Occurrence No. 50-219/82-57/ 03L Page 2 Apparent cause of Occurrence The apparent cause of occurrence was component failure due to stripping of the thread of the screw and backplate. In the backseating procedure, it is required to loosen and tighten the screws in order to complete the backseating proces s . It was apparently tightened over its limit several times in the past backseating processes causing the thread to strip.

Analysis of Occurrence The isolation condenser system is a standby high pressure system for the removal of the reactor heat following a reactor scram and isolation of the reactor from the main condenser - its normal heat sink. Making the #2 isolation condenser inoperable made no immediate threat to the heat removal capability for the reactor since there are two loops in the system and either of the two isolation condensers can accomplish the purpose of the system.

Since #1 isolation condenser was operable and #2 isolation condenser was out of service for only approximately one hour, the safety significance of this event is considered minimal.

Corrective Action i

The defective screw and backplste on the terminal block was replaced. The valve was satisfactorily testet for operability and returned to service. All sliding link screws on V-14-37 vere checked and no similar conditions were found.

Electricians will be issued required reading which discusses the proper method

to tighten terminal screws.

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