ML20140C579

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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 Measures of Risk from Sys,Components & Events.W/O Encl
ML20140C579
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 03/20/1986
From: Rubenstein L
Office of Nuclear Reactor Regulation
To: Nauman D
SOUTH CAROLINA ELECTRIC & GAS CO.
References
NUDOCS 8603250414
Download: ML20140C579 (2)


Text

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% R 20 yms Docket No. 50-395 DISTRIBUTION i

SDocket' File 1 J. Partlow

NRC PDR ~' ~ " J. Hopkins Local PDR M. Duncan Mr. D. A. Nauman PAD #2 Rdg ACRS (10)

Vice President - Nuclear Operations T. Novak Gray File South Carolina Electric & Gas OELD i Company E. Jordan P.O. Box 764 B. Grimes Columbia, South Carolina 29218

Dear Mr. Nauman:

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 infomation in PRAs regarding 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 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 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 1 into PRA methodologies; and the contribution to measures of risk (core melt frequency and consequences of radioactive releases) from systems, components j 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,

Lester S. Rubenstein, Director PWR Project Directorate #2 Division of PWR Licensing-A

Enclosures:

As stated I cc w/o enclosures: See next page

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j- 8603250414 e60320 PDR ADOCM 05000395 a P PDR

Mr. D. A. Nauman South-Carolina Electric & Gas Company Virgil C. Summer Nuclear Station cc:

Mr. William A. Williams, Jr.

Technical Assistant - Nuclear Operations Santee Cooper P.O. Box 764 (Mail Code 167)

Columbia, South Carolina 29218 1

J. B. Knotts, Jr., Esq.

Bishop, Liberman, Cook, Purcell and Reynolds 1200 17th Street, N.W. ,

Washington, D. C. 20036 l Mr. Mark B. Whitaker, Jr.

Group Manager - Regulatory and Support Services South Carolina Electric & Gas Company ,

P.O. Box 764 (Mail Code 160)

Columbia, South Carolina 29218 Resident Inspector / Summer NPS c/o U.S. Nuclear Regulatory Commission l Route 1, Box 64 ,

Jenkinsville, South Carolina 29065 l Regional Administrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Chairman, Fairfield County Council  !

P.O. Box 293 Winnsboro, South Carolina 29180 Attorney General Box 11549 Columbia, South Carolina 29211 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201

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