ML19345E926

Forwards LER 81-002/03L-0

ML19345E926
Person / Time
Site:	Oyster Creek
Issue date:	01/30/1981
From:	Finfrock I JERSEY CENTRAL POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345E927	List: ML19345E926 ML19345E931
References
NUDOCS 8102060434
Download: ML19345E926 (3)

Text

'

OYSTER CREEK NUCLEAR GENERATING STATION m-www gl*;SQf,('~fjg?g 9

(609) 693-1951 P.O SOX 388 e FORFED RIVER

• NEW JERSEY

• C8731 wwwne sac January 30, 1981 Mr. Boyce H. Gr .ar, Director Office of Inspection and Enforcemnt Region I United States Nuclear Regulatory Camission 641 Park Avenue Ki:q of Prussia, Pennsylvania 19406

SUBJECT:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Licensee Event Report

_ Rep 3rtable OcctLm. No. 50-219/81-02/3L This letter forwards three copies of a Licensee Event Report to report Reportable OcctL m. No. 50-219/81-02/3L in capliance with paragraph 6.9.2.b(2) of the Technical Specifications.

Very truly yours, 0

/

Ivan R. F' A L Ur.f Ih is Vice President &L Director - Oyster Creek IRF:dh Enclosures cc: Director (40 copies)

Office of Inspection and Enforement United States Nuclear Regulatory Cctmiission Washington, D.C. 20555 Diree n (3)

Office of Managemnt Infor: nation "C e and Program Control T

"; United States Nuclear Regulatory Camitssicn E 7 Washington, D. C. 20555 NRC Resident Inspector (1)

~

Oyster Creek Nuclear Generating Station

~

Forked River, N. J. .

in Lu P a

/

I S

OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Repor+

Reportable Occurrence No. 50-219/81-02/3L Report Date 1/30/31 Occurrence Date January 2, 1981 Identification of OcctLn. ence The stack gas activity was not continuously monitored as required by Technical Specification 3.6.A.3 due to a trip of Stack Gas Sample Punp "A".

This event is considered to be a rej;ortable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b(2) .

Conditions Prior to Occurrence The plant was operatirxJ at steady state power. Major plant parameters at the time of occurrence were:

Power: Core: 1740 Mdt Electrical 602 MWe Flow: Recirculation 14.6 x 410 y Feedwater 6.42 x 106 lb/hr Stack Gas Activity: 650 uci/sec Description of Occurrence On Friday, January 2,1981, at approximately 1545 hours0.0179 days <br />0.429 hours <br />0.00255 weeks <br />5.878725e-4 months <br /> a Stack Gas Iow Flow alarm was received in the control romt. While an operator was dispatched to investigate the problem a reactor shutdown was ccmnenced. At 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br /> the sample flow was restored to normal by placing the alternate pump in service.

The "A" punp was found to be tripped on thermal overload. At 1551 hours0.018 days <br />0.431 hours <br />0.00256 weeks <br />5.901555e-4 months <br /> the reactor shutdown was tenninated. The "A" punp was removed, replaced with a spare arxl returned to service at 1840 hours0.0213 days <br />0.511 hours <br />0.00304 weeks <br />7.0012e-4 months <br /> that day.

The "A" punp was subsequently disasserbled to determire the cause of the failure.

Investigation revealed that the pump vanes, which are made of a carbon based material, had wrn out causing then to break up which resulted in the punp binding up and tripping on overload. No other damage was found during the inspection.

]

. , /,

. . - .~, - ,. . . _

~

I 4

Reportable Occurrence Page 2 Report No. 50-219/80-02/3L Apparent Cause of Occurrence Stack Gas Sample Pu:tp "A" tripped on thermal overload caused by ptrp binding.

h is binding was caused by the carbon vanes thinning out and breaking up due to normal wear.

Analysis of Occurrence A review of the stack gas radiation monitor recorce traces showed the levels in both monitor channels to be constant (at 200 cps) befoa and after this event.

In a 2, rther effort to determine if excessive stack releam might have occurred during the time that both stack gas sample pumps were not operating, recorder traces of radiation Itonitoring systens associated with two gaseous streams released through the stack were reviewed. 'Ihe reactor ratilding ventilation exhaust radiation tronitor recorder traces sinwed that the levels in both channals were relatively constant with no spiking during the time of this event. Also, the recorder trace for the Augmented Off Gas Systen effluent rtonitor showed that radiation levels were constant during the period involved. Based on these

- considerations the safety significance of this event is considered minimal.

Corrective Action The stack gas sample flow was returned to nonnal by placing the alternate punp in service.

The pung was replaced with a spare and returned to service at 1840 hours0.0213 days <br />0.511 hours <br />0.00304 weeks <br />7.0012e-4 months <br /> that -

day. The installation of the new PMinactive Gaseous Effluents bbnitoring Systen now scheduled for ccxtpleticn in April 1981, will substantially improve the reliability of the Stack Gas bbnitoring Systen.

Failure Data Gast Manufacturing ,

bbdel #1022-103-6272X Serial #573

• /

., --