ML20078A026

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Forwards Rev 1 to Oyster Creek Tornado Missile Risk Analysis, Per SEP Topic III-4.A.Tornado Missiles W/Potential to Disable Listed Structures Have Negligible Contribution to Core Melt Frequency
ML20078A026
Person / Time
Site: Oyster Creek
Issue date: 09/16/1983
From: Fiedler P
GENERAL PUBLIC UTILITIES CORP.
To: Crutchfield D
Office of Nuclear Reactor Regulation
Shared Package
ML20078A029 List:
References
TASK-03-04.A, TASK-3-4.A, TASK-RR NUDOCS 8309220211
Download: ML20078A026 (2)


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U3U Nuclear Corporation NuCIMr IH interpace Parkway Parsippany. New Jersey 07054 201 263 6500 TELEX 136-482 Writer's Direct Dial Number:

September 16, 1983 Mr. Dennis M. Crutchfield, Chief Operating Peactors Brarch #5 Division of Licensing U.S. Nuclear Regulatory Conmission Washington, D. C. 20555

Dear Mr. Crutchfield:

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 SEP Topic No. III-4A Tornado Missiles Title 10 to Code of Federal Regulation, as implemented by Regulatory Guide 1.117, prescribes structures, systems, and components that should be designed to withstand the effects of a tornado, including tornado missiles, without loss of capability to perform safety functions.

During the integrated assessment of the subject SEP topic, the NT staff identified several components (e.g., motor control centers, control rod drive hydraulic filter, isolation condenser piping and containment spray valve) in the vicinity of the mechanical equipment access opening of the reactor building that are potential targets for missiles penetrating the access doors.

GPUN agreed to evaluate the potential for and consequences of tornado-missile impact on components in this area and provide protection, if necessary. GPUN also agreed to evaluate the potential for and consequences of tornado-missile damage to the diesel generator building.

The attached report entitled " Oyster Creek Tornado Missile Risk Analysis" (PEG-0276) was prepared to determine the frequency and consequences of tornado-missiles causing damage to the diesel generator and fuel oil day tank compartments, the diesel fuel oil supply tank compartment, and the reactor building railroad airlock doors and walls based on a site specific model of the plant layout including targets and postulated sources of missile types.

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W Ao36 GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation

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1 The evaluation concludes that tornado missiles having the potential to disable the above structures have a negligible contribution to the Oyster Creek core melt frequency using conservative assumptions and estimates. The detailed description of the methodology and assumptions used in the evaluation are given in the attached report.

Very truly yours, Q V,k" A b&

A Peter B. Fiedler Vice President and Director Oyster Creek 1r cc: Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenile King of Prussia, PA 19406 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, NJ 08731

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