ML20140E064

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Forwards Draft Repts Re Technical Insights Gained from Pras. Repts Discuss General Insights on Plant Strengths & Weaknesses Gained from Pras,Contributions to Core Melt Frequency & Insights Into PRA Methodologies.W/O Encl
ML20140E064
Person / Time
Site: Farley  Southern Nuclear icon.png
Issue date: 03/20/1986
From: Rubenstein L
Office of Nuclear Reactor Regulation
To: Mcdonald R
ALABAMA POWER CO.
References
NUDOCS 8603270177
Download: ML20140E064 (2)


Text

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MAR 2 01986 Docket No. 50-348 DISTRIBUTION and 50-364 Docket . Eile n J. Partlow NRC PDR E. Reeves Local PDR C. Vogan Mr. R. P. Mcdonald PAD #2 Rdg ACRS (10)

Senior Vice President T. Novak Gray File Alab ma Power Company OELD Post Office Box 2541 E. Jordan Birmingham, Alabama 35291 B. Grimes

Dear Mr. Mcdonald:

SUBJECT:

REPORTS ON PRA INSIGHTS Enclosed are two draft reports concerning technical insights gained from Probabilistic Risk Assessments (PRAs). These reports are the outcome of an ongoing effort to make available and utilize in numerous technical and managerial activities the information in PRAs regarding the factors which dorrinate the risk associated with nuclear pcver pfants. 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 methodologies focuses on areas which are sensitive to the results and the overall perception of plant weaknesses and vulnerabilitie's.

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; modifications, 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) from systems, components and events.

These reports are being provided to you, as well as all other licensees, in advance of formal publication for your information. Your comments and suggestions are welcome on these reports.

Sincerely, 8

Original signed 9[60327[h L [iester Ruhonsteln S. Rubenstein, Director PWR Project Directorate #2 Division of PWR Licensing-A

Enclosures:

As stated cc w/o enclosures: See next page h/) \ ) l PM:P/p!( D ERe6ves:he L b en 3 c/86 3/Lj/86

/

l Mr. R. P. Mcdonald l Alabama Power Company Joseph M. Farley Nuclear Plant l cc:

Mr. W. O. Whitt D. Biard MacGuineas, Esquire Executive Vice President Volpe, Boskey and Lyons Alabama Power Company 918 16th Street, N.W.

Post Office Box 2641 Washington, DC 20006 Birmingham, Alabama 35?91 Charles R. Lowman Mr. Louis B. Long, General Manager Alabama Electric Corporation Southern Company Services, Inc. Post Office Box 550 Post Office Box 2625 Andalusia, Alabama 364P0 Birmingham, Alabama 35202 Chairman Regional Administrator, Pegion II Houston County Commission U.S. Nuclear Regulatory Commission Dothan, Alabama 36301 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 George F. Trowbridge, Esquire Shaw, Pittman, Potts and Trowbridge Ira L. Myers, M.D.

1800 M Street, N.W. State Health Officer Washington, DC 20036 State Department of Public Feal th State Office Building Montgomery, Alabama 36130 Robert A. Buettner, Esquire Balch, Bingham, Baker, Hawthorne, Mr. 1. D. Woodard Williams and Ward General Manager - Nuclear Plant Post Office Box 306 Post Office Box 470 Birmingham, Alabama 35201 Ashford, Alabama 36312 Resident inspector U.S. Nuclear Regulatory Commission Post Office Box 24 - Route 2 Columbia, Alabama 36319 State Department of Public Health ATTN: State Health Officer State Office Building Montgomery, Alabama 36104