ML20094B888

Forwards SEP Topic III-10A,Thermal Overload Protection for Motors of Motor Operated Valves. Methodology to Determine Optimum Setpoints (Heater Size) for Thermal Overload Relays Developed

ML20094B888
Person / Time
Site:	Oyster Creek
Issue date:	07/30/1984
From:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
To:	Crutchfield D Office of Nuclear Reactor Regulation
Shared Package
ML20094B892	List: ML20094B888 ML20094B910
References
TASK-03-10.A, TASK-3-10.A, TASK-RR NUDOCS 8408070300
Download: ML20094B888 (3)

Text

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U M7 GPU Nuclear Corporation 100 Interpace Paraay Parsippany. New Jersey 07054-1 '

(201)263-6500 s

TELEX 136-422 Writer's Direct Dial Number -

July 30, 1984 Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch U.S. Nuclear Regulatory Commission Washington, D. C.

20555

Subject:

Oyster Creek Nuclear Generating Station (0CNGS)

Docket No. 50-219 SEP Topic No. III-10A, Thermal-Overload Protection for Motors of Motor-Operated Valves During the integrated assessment of the subject SEP topic, GPU Nuclear made a comitment to evaluate thermal-overload relays f.or the motor operator for each engineered safety feature (ESF) valve.

GPU Nuclear has recently developed a methodology as described in the attached report with which to determine the optimum setpoints (heater size) for the thermal-overload-relays.

satisfy Regulatory Guide 1.106 position C2, which requires that theThe setpoints be established with all uncertainties resolved in favor of completing the safety related function.

establishing these setpoints to help ensure completion of the valveSafety operation while still providing motor protection.

A sample calculation for sizing the thermal overload setpoints on Core Spray Isolation valve motor operator is included in the report.

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2-GPU Nuclear plans to utilize the methodology provided in the report for the remaining ESF valves in determining the setpoints. The evaluation and modification, if necessary, are expected to be completed by March, 1985.

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19406 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, N.J.

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