ML20141N561

Forwards Two Draft Repts Re Technical Insights Gained from Pras,For Info & Comments.Repts Discuss Insights on Plant Strengths & Weaknesses Gained from PRAs & Insights Into PRA Methodologies.W/O Encls

ML20141N561
Person / Time
Site:	Vogtle
Issue date:	03/05/1986
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Conway R GEORGIA POWER CO.
References
NUDOCS 8603170091
Download: ML20141N561 (3)

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3 Docket Nos. 50-424 and 50-425 ..

NAR 0 51915 Mr. Richard Conway Senior Vice President and Project Director Georgia Power Company Rt. 2, Box 299A Waynesboro, Georgia 30830

Dear Mr. Conway:

Subject': Reports on PRA Insights - Vogtle Units 1 and 2 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 dominate the risk associated with nuclear power plants. This effort includes identification of the features of design or coerational 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 vulnerabilities.

In particular, these reports contain discussions of: general insights on plant strengths and weaknesses gained from PRAs; the contribution to core m91t 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 fonnal publication for your information. Your coments and suggestions are welcome on these reports.

8603170091 960305 ' -

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{DR ADOCK 05000424 PDR D. thod B. J. Youngblood, Director PWR Project Directorate #4 Division of PWR Licensing-A, NRR

Enclosures:

As stated cc w/o enclosure:

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MAR 0 51966 Mr. R. E. Conway Georgia Power Company Vogtle Electric Generating Plant cc:

Mr. L. T. Gucwa Resident Inspector Chief Nuclear Engineer Nuclear Regulatory Comission Georgia Power Company P. O. Box 572 P.O. Box 4545 Waynesboro, Georgia 30830 Atlanta, Georgia 30302 Mr. Ruble A. Thomas Deppish Kirkland, III, Counsel Vice President - Licensing Office of the Consumers' Utility Vogtle Project Council Georgia Power Company / Suite 225 Southern Company Services Inc. 32 Peachtree Street, N.W.

P.O. Box 2625 Atlanta, Georgia 30303 Binningham, Alabama 35202 James E. Joiner Mr. Donald 0. Foster Troutman, Sanders, Lockerman, Vice President & Project General Manager & Ashmore Georgia Power Company Candler Building Post Office Box 299A, Route 2 127 Peachtree Street, N.E.

Waynesboro, Georgia 30830 Atlanta, Georgia 30303 Douglas C. Teper .

Mr. J. A. Bailey Georgians Against Nuclear Energy Project Licensing Manager 1253 Lenox Circle Southern Company Services Inc. Atlanta, Georgia 30306 P.O. Box 2625 Binningham, Alabama 35202 Laurie Fowler Esq.

218 Flora Avenue, N.W. '

Ernest L. Blake, Jr. Atlanta, Georgia 30307 Bruce W. Churchill, Esq.

Shaw, Pittman, Potts and Trowbridge Tim Johnson 1800 M Street, N.W. Executive Director Washington, D. C. 20036 Educational Campaign for a Prosperous Georgia Mr. G. Bockhold, Jr. 1083 Austin Avenue, N.E.

Vogtle Plant Manager Atlanta, Georgia 36307 Georgia Power Company Route 2. Box 299-A Billie Pirner Garde Waynesboro, Georgia 30830 Citizens Clinic Director Government Accountability Project Regional Administrator, Region II 303 10th Street U.S. Nuclear Regulatory Comission Augusta, Georgia 30901 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 303?3

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