05000219/LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Encl

Forwards LER 82-009/03L-0.Detailed Event Analysis Encl

ML20042B307
Person / Time
Site:	Oyster Creek
Issue date:	03/12/1982
From:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20042B308	List: 05000219/LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Encl 05000219/LER-1982-009-03, /03L-0:on 820210,overload Trip Occurred on Standby Gas Treatment Sys Exhaust Fan 1-8.Apparently Caused by Change in Breaker Trip Setpoint.Further Testing Underway
References
NUDOCS 8203250205
Download: ML20042B307 (3)

LER-1982-009, Forwards LER 82-009/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2191982009R00 - NRC Website

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GPU Nuclear gg g7 P.O. Box 388 Forked River, New Jersey 08731 609-693-6000 Writer's Direct Dial Number:

March 12, 1982 Mr Ronald C. Ilaynes, Administrator U.S. Nuclear Regulatory Commission gy N(,-

631 Park Avenue

- J N'c King of Prussia, PA 19406

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1 Jg'g7 C-Dea r Mr. llayne s :

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Subject:

Oyster Creek Nuclear Generating Station

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/2 Docket No. 50-219

_... - g Licensee Event Report Reportable Occurrence No. 50-219/82-09/03L This letter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/82-09/03L in compliance with paragraph 6.9.2.b.2 of the Technical Specifications.

Very truly yours, f

Pe. t e r B. Fiedler Vice President & Director Oyster Creek PBF:Ise Enc lo sure s

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cc:

Director (40 copies)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Director (3)

Of fice of Management Information and Program Control U.S. Nuclear Regulatory Commission Washington, D.C.

20555 NRC Resident Inspector (O Oyster Creek Nuc1 car Generating Station Forked River, NJ 08731 i

i 8203250205 820312 PDR ADOCK 05000 5

GPU Nuclear is a part of the General Public Utilities System 4

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r OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Report able Occurrence No. 50-219/82-09/03L Report Date March 12, 1982 Occurrence Date Fe brua ry 10, 1982 Identification of Occurrence

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The plant was operating in a degraded mode as permitted by a limiting condition for operation as given in Technical Specification 3.5.B.3 when Standby Gas Treatment System #1 was found to be inoperable during a scheduled surveillance test.

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 in the refuel mode and the reactor coolant temperature was below 2120F.

De scription of Occurrence On Wednesday, February 10, 1982, during a 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> operability test of Standby Gas Treatment System (SGTS) #1, SGTS exhaust fan motor EF 1-8 tripped.

SGTS #2 had been surveilled satisfactorily prior to the failure of SGTS #1.

Appa rent Cause of Occurrence An overload trip on the "B" phase of EF 1-8 had occurred. During preventive maintenance, EF 1-8 breaker overload had been lowered from the original +15%

setting to a -15% setting to limit the notor current to 108% of the motor full load amps.

Analysis of Occurrence The Standby Gas Treatmenc System filters reactor building atmosphere to the stack in the event of an accident which could potentially release large quantities of radioactive effluents.

The safety significance of this event is considered miaimal due to the fact that Standby Gas Treatment System #2 was operable during the time of the event.

Reportable Occurrence Page 2 Report No. 50-219/82-09/03L

Corrective Action

SGTS #1 was declared inoperable, and SGTS #2 was verified to be operable.

Subsequently, EF 1-8 breaker overload was reset to the +15% position and SGTS

1. 1 was tested and returned to service.

The full load nameplate current rating for the fan motors is 12.8 amps.

The overload relay incorporates a dial feature to accommodate a +15% field adjustment of tripping. current, and it was set at 108% of nameplate current.

As part of an ongoing engineering investigation, testing will be performed prior to plant startup. The testing will determine whether the system and its instrumentation are performing as designed.

Problems discovered in the performance of the system test will determine whether' adjustments are necessary in the system to bring the fan motor amperage to within its 100% design value, or whether an upgrading in the motor design horsepower. rating is justified.

Results of this testing will further determine the apparent cause of this -

occurrence, and corrective actions necessary to prevent recurrence.

The Maintenance Manager and Plant Engineering Director will iseue directives to their staffs to obtain approval prior to changing any setpoints.

Failure Data Ma nu f ac ture r : General Electric Model:

CR124-C028 Motor Overload Relay l

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