ML20154M740

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

ML20154M740
Person / Time
Site:	Catawba
Issue date:	03/05/1986
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
NUDOCS 8603140453
Download: ML20154M740 (4)

Text

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I MAR 0 51996 I Docket Nos. 50-413

[ and 50-414

f. - Mr. H. B. Tucker, Vice President

i. Nuclear Production Department L Duke Power Company 422 South Church Street

} Charlotte, North Carolina 28242

Subject:

' Reports on PRA Insights - Catawba 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 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 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 consnents and suggestions are welcome on these reports.

Sincerely, aisned by,

, g

/

./ c' B. J. Youngblood, Director i PWR Project Directorate #4 Division of PWR Licensing-A, NRR

Enclosures:

As stated cc w/o enclosure:

See next page i r>sh b PWR D R-A PW -

@-A PWR#4:DPWR-A MD h;t: ab KJ our BJYoungblood 03/t /86 03/ A /86 03/ 9 /86 B603140453 960305 DR AbDCK O 4y3

_ qn Mr. H. B. Tucker Duke Power Company Catawba Nuclear Station CC: . . -

William L.-Porter, Esq. North Carolina Electric Membership Duke Power Company Corp.

P.O. Box 33189- 3333 North Boulevard Charlotte, North Carolina 28242 P.O. Box 27306 Raleigh, North Carolina 27611 J. Michael McGarry, III, Esq.

Bishop Liberman, Cook, Purcell Saluda River Electric Cooperative, and Reynolds Inc.

1200 Seventeerth Street, N.W. , _P.O. Box 929 Washington, D. C. 20036 Laurens, South Carolina 29360 North Carolina MPA-1 Senior Resident Inspector Suite 600 Route 2, Box 179N 3100 Smoketree Ct. York South Carolina 29745 P.O. Box 29513 Raleigh, North Carolina 27626-0513 Regional Administrator, Region II U.S. Nuclear Regulatory Conunission, Mr. C. D. Markham 101 Marietta Street, NW, Suite 2900 Power Systems Division Atlanta, Georgia 30323 Westinghouse Electric Corp.

P.O. Box 355 '

Pittsburgh, Pennsylvania 15230 Robert Guild Esq.

2759 Rosewood Drive NUS Corporation Columbia, South Carolina 29205 2536 Countryside Boulevard Clearwater, Florida 33515 Palmetto Alliance .

2759 Rosewood Drive Mr. Jesse L. Riley, President Columbia, South Carolina 29205 Carolina Environmental Study Group 854 Henley Place Karen E. Long Charlotte, North Carolina 28208 Assistant Attorney General N.C. Department of Justice Richard P. Wilson, Esq. P.O. Box 629 Assistant Attorney General Raleigh, North Carolina 27602 S.C. Attorney General's Office P.O. Box 11549 Spence Perry, Esquire Columbia, South Carolina 29211 Associate General Counsel Federal Emergency Management Agency Piedmont Municipal Power Agency Room 840 100 Memorial Drive 500 C Street Greer, South Carolina 29651 Washington, D. C. 20472 Mark S. Calvert. Esq. Mr. Michael Hirsch Bishop, Liberman, Cook, Federal Emera acy Management Agency Purcell & Reynolds Office of the .aneral Counsel 1200 17th Street, N.W. Room 840 Washington, D. C. 20036 500 C Street, S.W.

Washington, D. C. 20472 Brian P. Cassidy, Regional Counsel Federal Emergency Management Agency, Region I J. W. McCormach POCH

, Boston, Massachusetts 02109

I MAR 0 51986

, ' . i Catawba (amend:nents) cc:

Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street

. Columbia, South Carolina 29201 County Manager of York County York County Courthouse York, South Carolina 29745 Attorney General P.O. Box 11549 Columbia, South Carolina 29211 O

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