ML20141N076

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Forwards Draft Repts Re Technical Insights Gained from Pras. Repts Include General Insights on Strengths & Weaknesses Gained from PRAs & Mods Implemented to Address Problems Identified During Pra.Comments Requested by 860325.W/o Encl
ML20141N076
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 02/24/1986
From: Lynch D
Office of Nuclear Reactor Regulation
To: Agosti F
DETROIT EDISON CO.
References
NUDOCS 8603030527
Download: ML20141N076 (2)


Text

O O February 24, 1986 Docket No. 50-341 DISTM BUTION:

dfocket No. 50-341 NRC PDR Mr. Frank Agosti Local PDR Vice President - Nuclear Operations BWD-3 r/f Detroit Edison Company EAdensam 6400 North Dixie Highway EHylton Newport, Michigan 48166 DLynch RBernero

Dear Mr. Agosti:

Attorney, OELD JPartlow EJordan

Subject:

Reports on PRA Insights BGrimes ACRS (10)

Enclosed are two draft reports concerning technical insights gained from Probabilistic Risk Assessments (PRAs). These reports are the outcome of an on-going effort to make available and utilize in numerous technical and managerial activities the information in probabilistic risk assessments rega-ding the factors which dominate the risk associated with nuclear power plants. This effort includes identification of the features of design or operational practices which have been found to be important to safety in the types of plants which have been subjected to risk assessments. In addition, the section on insights into PRA method focuses on areas which are sensitive to the results and the overall perception of plant weaknesses and vulnerabilities.

In particular, these reports contain discussions of: general insights on plant strengths and weaknesses gained from PRAs; the contribution to core melt frequency from classes of sequences induced by various initiating events; modifi-cations, both hardware and procedural, which have been implemented to address problems identified in the conduct or as a result of PRAs; insights into PRA methodologies; and the contribution to measures of risk (core melt frequency and consequences of radioactive releases) fron systems, components and events.

These reports will be published in their final forms in approximately two months.

These reports are being provided to you, as well as all other licensees, in advance of formal publication for your information. If, after reviewing these reports, you wish to provide comments to the staff, please provide them by March 25, 1986.

Sincerely,

/S/

Dave Lynch, Project Manager BWR Project Directorate No. 3 Division of BWR Licensing

Enclosures:

} As stated cc: See next page L' -3: DBL DLynSh /hmc E d nsam 7

2/f.986 2p/86 8603030527 060224 PDR ADOCK 05000341 P PDR L.

Dr. Wayne Jens Detroit Edison Company Fermi-2 Facility.

cc:

Mr. Harry H. Voigt, Esq. ' Ronald C. Callen LeBoeuf, Lamb, Leiby & MacRae _ Adv. Planning Review Section 1333 New Hampshire Avenue, N. W. Michigan Public Service Commission

' Washington, D. C. 20036 6545_ Mercantile Way P. O. Box 30221 John Flynn, Esq. Lansing, Michigan 48909 Senior-Attorney The Detroit-Edison Company Regional Administrator, Region III 2000 Second Avenue U. S. Nuclear Regulatory Commission Detroit, Michigan 48226 799 Roosevelt Road Glen Ellyn,. Illinois- 60137 Mr. Dennis R. Hahn, Chief Nuclear Facilities and Environmental Monitoring Section Office Division of-Radiological Healtn P. O. Box 30035 Lansing, Michigan 48909 Mr. Robert Woolley Acting Supervisor-Licensing The Detroit Edison Company Fermi Unit 2 6400 No. Dixie Highway Newport, Michigan 48166 Mr. Paul Byron U. S. Nuclear Regulatory Commission Resident Inspector's Office 6450 W. Dixie Highway Newport, Michigan 48165 Monroe County Office of Civil Preparedness 963 South Raisinville Monroe, Michigan 48161

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