05000219/LER-1982-023, Forwards LER 82-023/03L-0.Detailed Event Analysis Encl

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Forwards LER 82-023/03L-0.Detailed Event Analysis Encl
ML20053C996
Person / Time
Site: Oyster Creek
Issue date: 05/20/1982
From: Fiedler P
GENERAL PUBLIC UTILITIES CORP.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20053C997 List:
References
NUDOCS 8206030259
Download: ML20053C996 (3)


LER-2082-023, Forwards LER 82-023/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
2192082023R00 - NRC Website

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  • O GPU Nuclear Q g7 P.0. Box 388 For,x ed River, New Jersey 08731 609-693-6000 Writer's Direct Dial Number:

May 20, 1982 Mr. Ronald C. Hayne s , Adminis trator Region I U.S. Nuclear Regulatory Commission 6 31 Park Avenue King of Prussia, PA 19406 Dea r Mr. Hayne s :

Subjec t: Dyster Creek Nuclear Generating Station Docke t No. 50-219 Licensee Event Report Reportable Occurrence No. 50-219/82-23/03L This .etter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/82-23/03L in compliance with paragraph 6.9.2.b.2 o f the Technical Specifications.

Very truly yours, q *

^

Peter B. Fiedler Vice President & Director Oyster Creek PBF:Ise Enclosures c c: Director (40 copies)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Comission Washington, D .C. 20555 l Director (3)

Of fice of Management Information and 1

Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 NRC Resident Inspector (1)

Oyster Creek Nuclear Generating Station Forked River, NJ 08731 8206030259 820520 gDRADOCK 05000219 PDR ,,

GPU Nuc! ear is a pai of the General Pubhc Utihties System $

1 u

OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/82-23/03L Report Date May 20, 1982 Occurrence Date April 18,1982 Identification o f Occurrence The "A" CRD pump was taken out of service due to excessive vibration and overheated outboard bearings. This condition resulted in operation in a degraded mode permitted by a limiting condition for operation as specified in the Te chnical Specifications, paragraph 3.4.D.2.

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 The plant was operating at steady state power.

Power: Reactor 904.2 MWt Ge nerator 285 MWe Flow: Recirculation 9.5 x 10 4 p, Feedwa ter 3.165 x 10 lb/hr De scription of Occurrence On April 16, 1982, the "A" CRD pump was reported to be operating normally. The following day, the pump was shutdown to repair leaks to the seal water lines.

The leaks encountered would not pose an operability problem to the pump. All the valves (with the exception of vent valves) on the pump were closed to isolate the pump from the system. The repairs were made and Maintenance returned the pump to Operations the afturnoon of April 17, 1982.

The pump was returned to service late in the afternoon of April 17, 1982.

Operations reported the pump to be running smoothly and had passed the operability tests.

Late in the af ternoon of April 18, 1982, the pump was reported to be encountering increased vibration, increased noise, and the outboard bearings were hot. The magnitude of the vibration and the degree of heat of the outboe i bearings were not evaluated through the use of an instrument. The pump was taken out of service and its condition was reported to both Maintenance and Plant Engineering.

e Li;ensee Event Report Page 2 Reportable Occurrence No. 50-219/82-23/03L Apparent Cause of Occurrence The exact cause of the failure has not been determined. The component that failed was the rotating assembly of the pump. The pump appeared to have lost capacity due to an enlarging of the interstage bushing clearances in the rotating assembly.

Analysis of Occurrence The CRD pump supplies control rod drive cooling water, accumulator charging and rod maneuvering pressure as well as make-up water to the reactor core. For pipe break sizes up to 0.002 f t2, the flow from a single control rod drive pump is adequate for maintaining the reactor vessel water level nearly five feet above the core, thus alleviating need for auto relief actuation. As the redundant pump remained operable while repairs were made, the safety significance is considered minimal.

Corrective Action The immediate corrective action taken was to replace the failed rotating assembly with a new rotating assembly.

Future corrective action will be determined af ter an engineering evaluation is performed on system operating conditions.

Fa ilure Data Pump Worthington Pump Corp.

Type 2WIF810 Diffuse Type Centrifugal Pump Serial Number 1613735