ML19324B799

Responds to Generic Ltr 88-20,Suppl 1, Individual Plant Exam. PRA Will Include Treatment of Internal Floods & Logic Models Will Be Constituted Using state-of-the-art Software on Pc

ML19324B799
Person / Time
Site:	Oyster Creek
Issue date:	10/31/1989
From:	Fitzpatrick E GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-88-20, NUDOCS 8911080258
Download: ML19324B799 (2)

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9 Gentlemen M, SUBJECT - OYSTER CREEK NUCLEAR GENERATING STATION LOCKET I?O. 50-219

, RESPCdSE TO GENERIC LETTE" 88-20, SUPP 1 l' INDIVIDUAL PLANT EXAMINATION (IPE) s 4

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,g ..his letter outlines our plans for completing the IPE for Oyster Creek. We

'have' begun'a level 1 PRA utilizing the large-event-tree,'small-fault-tree ,i

. approach.similar to that used for the THI-l PRA submitted in DecemDer 1987. J

.g }The PRA'will include' treatment of internal floods and the icgic models will be

'j constituted using state-of-the-art software on personal computers. This  !

nottuare ls expected'to make the PRA more useful a risk management tool once .J

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The back-end portion of the IPE will be performed utilizing the guidance in 1 NUREG-1335 and will address the Mark I containment performance issues P identified in Enclosure 2 of Generic Letter 80-20, supp'l. Us are developing the capability to use tho MAAP computer code as needcd. We will also take j advancage of other analyses tht may be performed by owner's groups, EPRI, 1

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, 'As Generic Letter 88-20 requiret, we plan to involve appropriate parts of the i organization in the conduct and review of the IPE. Our experience indicates that heavy involvement of the operations staff as well as technical support

. groups is necessary to develop useful results. This Jr..viveu.cnt necessarily-involves significant amounts of staff hcurs across severrl organizations and on+1derable schedule time to reach and properly document concensus' ,

s anc Lusions. These factors, in conjunction with the need for an independent review as specified in Generic uetter'88-20 and the need to coordinate a number of activities with owner's groups, indicate to us that the three year schedule for submittal of the IPE has little or no margin for delays. We will make every ef. ort so submit the IPE for Oyacer Creek by September 1, 1992.

I Sincerely, r

E. E. Fithpatrick  ;

Vice President & Director, Oyster Creek EEF/YN/(JW)

' cc: Mr. William T. Russel, Administrator Region I U.S. Nuclear Regulatory Commission 475 Allendale noad King of Prussia, PA. 19406 NPC Resident Inspector Oyster Creek Nuclear Generating Station Forned River, N.J. 08731 Mr. Alex Dromerick U.S. Nuclear Regulet ,ry Comniission Mail Station Pl-137 Washington, D.C. 2055E i

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