ML20010B386

Forwards LER 81-033/01T-0.Detailed Event Analysis Encl

ML20010B386
Person / Time
Site:	Oyster Creek
Issue date:	08/06/1981
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20010B387	List: ML20010B386 ML20010B395
References
NUDOCS 8108140428
Download: ML20010B386 (3)

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OYSTER CREEK NUCLEAR GENERATING STATION

$O127%""O%

an.on wum a,x,n (609)693-6000 P.O. BOX 388

• FORKED RIVER

• NEW JERSEY

• 08731 August 6, 1981 Mr. Boyce H. Grier, Director Office of Inspytion and Enforcment Region I United States Nuclear Regulatory Cm mission 631 Park Avenue King of Prussia, Pennsylvania 19406

SUBJECT:

Oyster Creek Nuclear Generating Stat. ion Docket No., 50-219 Licensee Event Report Reportable Occurrence No. 50-219/81-33/0lT-0 This letter forwards three copies of a Licensee Event Report to report Reportable Gccurrence No. 50-219/81-33/0lT-0 in ocmpliance with paragraph 6.9.2.a.2 of the Technical Specifications.

Very truly yours, A& Y ~

l

. T. Carroll, J .

l Acting Directo ster Creek JIC:dh Enclosures

( cc: Director (40 copies) 'N l Office of Inspection and Enforement } //4

~

United States Nuclear Pegulatory Ccumission',.s s b,f' 'M l

Washington, D.C. 20555 a

> I$ b. i 13\

u-Director (3)  : /,UU 131981 > Z Offi of Managment Information g. va.nyc '4 and Program Control

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l xf United States Nuclear Regulatory Ccumission 8 Washington, D. C. 20555 ,

NRC Resident Inspector (1)

Oyster Creek Nuclear Generating Station Forked River, N. J.

SYp geren*afo$h S

OYSTER CREEK NUCLEAR GENERATING STATICN Forked River, New Jersey 08731 Lic ssee Event Report Reportable Occurrence No.-50-219/81-33/0lT-0 Report Date August 6, 1981 Occurrence Date July 24, 1981 Identification of Occurrence A violation of Technical Specifications, paragraph 3.5.B.1 occurred when Secondary Contaiment Integrity was not maintained. Both personnel access contairrnent doors on the Northwest side of the Reactor Biilding were found ajar.

This event is considered to be a reportable occurrence as defined in the Technical Specifications,paragrapi6.9.2.a.2.

Conditions Prior to Occurren The plant was at steady state power.

Power: Reactor 1544 N t Generator 409 m e Flow: Recirculation 13.9 x 104 gpn Feedwater 4.71 x 10 lt/hr Description of Occurrence At approximately 1215 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.623075e-4 months <br /> on July 24, 1981, the inside and outside (N.W.

corner, 23' elevaticn) Reactor Building personnel access air lock doors were found ajar. The Group Shift Supervisor was notified of the situation and upon arrival at the access air lock doors found than closed. The Group Shift Super-visor checked the interlocking systen and found it to be operating satisfactorily.

Electrical Maintenance was then requested to inspect the cccess door plunger latch mechanism.

Apparent cause of Occurrence Due to the continual opening and closing of the Reactor Building airlock doors, the interlock plunger mechanian was worn and had became loose. This created a mcznentary situation where the p'.unger muld not extend fully or engage p. ply, due to plunger mechanisn misalignment. Since the plunger had extended slightly, the interlock systen allowed the inside door to open, even though the outside Scor had not been locked closed.

. - . ~ __ .. . .

t Reportable Occurrence Page 2 Report No. .50-219/81-33/0lT-0 Analysis of Occurrence Secondary Cantalment is lequired to minimize ground level release of airborne radimetiw material and to provide for controlled, elevated release' of the building atmosphere under an idant ecoditions. The ahility of W_r_y Catain-ment to perfom i>s intended functicn with both air lock doors open was degraded.'

Corrective Action Electrical Maintenan s tightened the plunger mechani m. A work order has been inai=d to replace the intarlN*'s worn parts, and an Engirmaring Task has been issued to evaluate, and possibly upgrade the Reactor Bi41 ding ' airlock door interlock systen. Due to the recurrence of this proble, a cartplete mechanical and electrical inspection will be conducted and an in=arliate refurbistunent effected to gain full usage of the intar1~ k systan to perfom its function.

This task will be assigned on a priority basis.

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