ML20086S889

Outlines Util Plan for Completing Individual Plant Exam of External Events for Severe Accident Vulnerabilities,Per Suppl 4 to Generic Ltr 88-20.NRC Recommended Screening Approaches Will Be Utilized for Winds & Nearby Hazards

ML20086S889
Person / Time
Site:	Crane
Issue date:	12/24/1991
From:	Broughton T GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
C321-91-2150, GL-88-20, NUDOCS 9201060049
Download: ML20086S889 (4)

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OPU Nuclear Corporation

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=orro Middletown, Pennsylvania 17057 0191 T17 944 7621 TELEX 84 2386 Writer's Direct Dial Number:

(717) 948-8005 December 24, 1991 C311-91-2150 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C.

20555

Subject:

Three Mile Island Nuclear 'ienerating Station, Unit 1 (THI-1)

Operating License No. DPR-50 Docket No. 50-289 Response to Generic Letter 88-20, Supplement 4,

" Individual Plant Examination for External Events" (IPEEE)

This letter outlines the GPU Nuclear plan for completing the IPEEE for THI-1.

Our letter of October 31, 1989 outlined our approach to the internal events IPE Generic Letter 88-20, Supplement 1.

We are currently in the process of updating the Level 1 Probabilistic-Risk Assessment (PRA) submitted in December 1987 and developing a Level 2 PRA tn support our approach to resolution of IPE issues. A large fraction of this work is being performed in-house and a final repon. is scheduled for submittal to NRC by June 1,1993.

Also underway is our work to develop a Level 1 and level 2 PRA for Oyster Creek. The Oyster Creek IPE is scheduled to be submitted to NRC by September 1, 1992. Due to our limited in-house resources these schedules have little or no margin for delay; our primary focus at this time is completion of the IPE.

Our plans for completing the IPEEE for TMI-1 involve updating the external events PRA submitted in December 1987 and expanding it to include containment issues in accordance with NRC guidance in NUREG-1407. This work will be accomplished utilizing our in-house staff to the greatest extent practical.

For wi' ids and nearby hazards, we will apply the NRC staff's recommended screening approach where possible.

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C311-91-2150 i

Page 2 We plan to address the IPEEE issues using PRA techniques, including fire and seismic issues, The seismic work will be coordinated with our efforts to resolve the seismic qualification _ of equipment issue (A-46),

To avoid duplication of effort, concarrent plant walkdowns for IPEEE and A-46 seismic issues are planned for refueling outage llR in late 1995. An integrated schedule of major activities for IPE, IPEEE, and A-46 for both Oyster Creek and THI-l is enclosed.

Because of the desire to coordinate the IPEEE and A-46 walkdowns, and the existing demands on in-house staff to complete the IPE for 3

both plants, we have scheduled the final submittal of the TM1-1 IPEEE for

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December 22, 1996. A partial submittal addressing high winds, external floods, and nearby hazards is scheduled for June 28, 1994.

These schedules will be incorporated-into the next update of the NRC Integrated Schedule for TMI-1.

i Sincerely,

)4),fu.uftftw s

T. G. Broughton e

Vice President and Director, TMl-1 DJD/amk Enclosure cc:

IM1-1 Senior Project Manager Region I Administrator TMI Senior Resident Inspector J. Butler - NUMARC l.-

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C311-91-2150 METROPOLITAN EDIS0N COMPANY-JERSEY CENTRAL POWER AND LIGHT COMPANY PENNSYLVANIA ELECTRIC COMPANY GENERAL PUBLIC UTILITIES NUCLEAR COPR0 RATION Three Mile Island Nuclear Station, Unit 1 (THI-1)

Operating License No. OPR 50 Ocket No. 50-289 Response to the Generic Letter 88-20, Supplement 4 Individual Plant Exmaination for External Events (IPEEE)

-This letter is submitted in response to Generic letter 88-20, Supplenent 4, 10 CFR 50.54(f) Request

" Individual Plant Examination for External Events."

All statements contained in this resmnse have been reviewed, and all such statements made and matter set forth therein are true and correct to the best of my knowledge.

fLm Am b

T. G. Brought 4n Vice President and Director, TMI-:

Signed and sworn before me this

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