05000219/LER-1981-044, Forwards LER 81-044/03L-0.Detailed Event Analysis Encl

Forwards LER 81-044/03L-0.Detailed Event Analysis Encl

ML20049A932
Person / Time
Site:	Oyster Creek
Issue date:	09/23/1981
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20049A933	List: 05000219/LER-1981-044, Forwards LER 81-044/03L-0.Detailed Event Analysis Encl 05000219/LER-1981-044-03, /03L-0:on 810825,during 10-h Operability Test, Standby Gas Treatment Sys Fan Found to Be Excessively Noisy & Running W/Hot Bearings.Caused by Normal Wear.Bearings Replaced
References
NUDOCS 8110020388
Download: ML20049A932 (3)

LER-1981-044, Forwards LER 81-044/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2191981044R00 - NRC Website

text

le t; e

t OYSTER CREEK NUCLEAR GENERATING STATION N

& O,S C Y.% 7s ? f,7 (609)693-6000 P.O. BOX 388

• FORKED RIVER

• NEW JERSEY

• 08731 a.4 - ru um s,-

Septmber 23, 1981 Mr. Ronald Haynes, Director p

e Office of Inspection and Enforcenent 4

Region I United States Nuclear Regulatory Carmission g

631 Park Avenue C

d King of Prussia, Pennsylvania 19406 OcI.l T

ss, 198tr g

Dear Mr. Haynes:

7h

'tler 5 SUIDECT: Oyster Creek Nuclear Generating Sta

(

Docket No. 50-219 Licensee Event Report Report;ble Occurrence No. 50-219/81-44/3L This letter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/81-44/3L in e mpliance with paragraph 6.9.2.b.2 of the Technical Specifications.

Very truly yours,

- l U t'$

t

. T. Carroll, J

/ cting Director ster Creek JIC:dh l

Enclosures cc: Director (40 ct,ies)

Office of Inspection and Enforcanent l

United States Nuclear Regulatory Cannission Washington, D.C.

20555 Director (3)

Office of ManagcTent InforTnation and Progran Control United States Nuclear Regulatory CaTmission Washington, D. C. 20555 l

NRC Resident Inspector (1)

Oyster Creek Nuclear Generating Station [l

Forked River, N. J.

8110020388 810923 PDR ADOCK 05000219 S

PDR

s OYSTER CREEK NUCIEAR GENERATING STATICN Forked River, New J:rsey 08731 Licensee Event Report Reportable Occurrence No. 50-219/81-44/3L Report Date Septaber 23, 1981 Occurrence Date August 25, 1981 Identification of Occurrence The plant was operating in degraded node as pennitted by a limiting condition of operation as given in Technical Specifications section 3.5.B when the Standby Gas Treatment System (SGIS) exhaust fan (EF1-8) was removed frcm service for corrective maintenance.

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

Conditions Prior to Occurrence The plant was in the refuel node at the time of the occurrence.

Reat,.

tenpera-tures were below 212 F and the 7.eactor was vented.

Description of Occurren At approximately 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> ca August 25, 1981 during a 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> operability test, the Standby Gas Treatmant Systen exhaust fan (EF1-8) was producing an excessive amount of noise. At the time of the event the fan bearings were observed to be at high csperature. The alternate exhaust fan (EFl-9) was placed inservice and at approximately 2125,EF1-8 was declared inoperable in preparation for corrective maintenance.

Apparent Cause of Occurrence The bearing collet became loose which allowed the fan blading to shift kri-zontally. This resulted in the blading rubbing against the inside of the fan housing causing excessive noise. In addition to the loose collet, the fen roller bearings were also observed to have indications of wear.

Analysis of Occurrence The Standby Gas Treatment Systan filters Reactor Building atmosphere to the stack in the event of an accident which could potentially release large quantities of radioactive material. The safety significan of this event is considered minimal due to the fact that the Standby Gas Treatment Systen exhaust fan EFl-9 was operable durirg the time of the event.

Reportablo Occurrence Page 2 Report No. 50-219/81-44/3L

Corrective Action

Both of the Standby Gas Treatment Systen (El-8) roller bearings on the SGTS fan (El-8) were replaced and the fan was returned to service on August 26, 1981.

Also, Standby Gas Treatnent Systen exhaust fan 1-9 will be inspected prior to plant startup.

As part of the station's preventative maintenance progran the Standby Gas Treatment Systen fans El-8 and El-9 will be checked quarterly for proper belt and bearing operation.. A vibration analysis will also be performed on each fan routinely.