ML20069L376

RO 83-11:on 830326,decay Heat Pump 1A Shaft Bearings Failed,Rendering Pump Inoperable.Caused by Incorrect Design Change to Pump Bearing Lube Oil Sys.Lubrication Sys for Pumps 1A & 1B Returned to Original Configuration

ML20069L376
Person / Time
Site:	Three Mile Island
Issue date:	04/18/1983
From:	Hukill H GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
5211-83-120, RO-83-11, NUDOCS 8304280183
Download: ML20069L376 (2)

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A g DZSIGNATED ORIGINE C atifica By MM ' ~8 le WJNuclear GPU Nuclear Corporation

'3=st: a 8o Middletown. pennsylvania 17057 717 944 7621 TELEX 84 2386 Writers Direct Daal Ernber:

April 18, 1983 5211-83-120 Regional Administrator Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Dear Sir.

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50  ;

Docket No. 50-289 LER 83-11 This letter confirms the conversations on March 28,1983 (R. J. Toole to R. Conte), April 11, 1983 (M. A. Nelson to A. Fasano and F. Young) and on April 15, 1983 (M. A. Nelson to A. Fasano, final declaration of reportability) concerning reportability of following event.

At 3 p.m. on April 15, 1983, it was determined that an incident involving the Decay Heat Removal Pumps was reportable per Tech Spec 6.9.2. A.9. The incident occurred on March 26, 1983 and has been under investigation since.

On March 26, 1983, the Decay Heat Pump 1A shaft bearings failed, making the pump i==ediately inoperable. The investigation determined that a new design change that was made to the pump bearing lube oil system did not work correctly. Because of an inadequate understanding of the new oiling design, the operators removed the manual oiler from the pump and because of inadequate calibration of the new oiler, the bearing lost lubrication.

Action was required to return the lubrication system for both DH-PlA 61B to their original configuration. This failure is, therefore, reportable under Tech. Spec. 6.9.2.A.9, " Performance of structures, systems, or r:om-ponents that require remedial action...".

In addition to returning the system to their original configuration, a

, review of the existing oiler design is underway.

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8304280183 830418 PDR ADOCK 05000289 S PDR GPU Nuclear Corporation is a subsidiary of the General Put c Uts ties Cctporstien p'Z8

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Regional Administrator 5211-83-120 t

The details of this occurre.nce-end-corracche action to prevent recurrence will be provided in a follou-up report.

Sincerely.

. . i Director, TMI-l EDH:CWS:vjf' ec: J. Van Vliet R. Conte 1 .. s s,c f

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