ML20141N674

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

ML20141N674
Person / Time
Site:	Wolf Creek
Issue date:	03/05/1986
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Koester G KANSAS GAS & ELECTRIC CO.
References
NUDOCS 8603170492
Download: ML20141N674 (3)

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Docket No..50-482 MAR 0 51986 -

,.Mr. Glenn L.-Koester-

.Vice President.- Nuclearr Kansas Gas & Electric Company <

201 North Market Street ~

~ Post Office Box 208-

. -Wichita, Kansas ~ 67201

Dear,

Mr. Koester:-

" ~

Subject:

, Reports on PRA Insights - Wolf Creek: Unit 1 Enclosed are two draft reports concerning technical insights gained from Probabilistic Risk Assessments (PRAs). : These reports .are the outcome of an.o.ngoing' 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

~p lant 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.

i.

'T' hese 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, g sped by:

D. good B. J. Youngblood, Director PWR Project Directorate #4

, Division of PWR Licensing-A, NRR

~

Enclosures:

As stated cc w/o enclosure:

See next page DSlf fn

. PNR#, - WR-A PWRf4:DPWR-A PWR#4:DPWR-A MDlIfi n.kab P0'Connor BJYoungblood 03/y/86 03/ g /86 03/,g /86

, 8603170492 860305  ?

PDR ADOCK 05000482

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D O S 586 Mr. Glenn L. Koester Wolf Creek Generating Station Kansas Gas and Electric Company Unit No. I cc:

Mr. Nicholas A. Petrick C. Edward Peterson, Esq.

Executive Director, SNUPPS Legal Division 5 Choke Cherry Road Kansas Corporation Comission Rockville, Maryland 20850 State Office Building, Fourth Floor Topeka, Kansas 66612 Jay Silberg, Esq.

Shaw, Pittman, Potts & Trowbridge Regional Administrator, Region IV 1800 M Street, NW U.S. Nuclear Regulatory Comission Washington, D.C. 20036 Office of Executive Director for Operations Mr. Donald T. McPhee 611 Ryan Plaza Drive, Suite 1000 Vice President - Production Arlington, Texas 76011

' Kansas City Power & Light Company 1330 Baltimore Avenue Mr. Allan Mee Kansas City,' Missouri 64141 Project Coordinator Kansas Electric Power Cooperative,Inc.

Chris R. Rogers, P.E. P. O. Box 4877 Manager, Electric Department Gage Center Station Public Service Comission Topeka, Kansas 66604 i- P. O. Box 360 Jefferson City, Missouri 65102 Resident Inspector / Wolf Creek NPS c/o U.S. Nuclear Regulatory Comission

, ReFional Administrator, Region III P. O. Box 311

U.S. Nuclear Regulatory Comission Burlington, Kansas 66893 1 799 Roosevelt Road j Glen Ellyn, Illinois 60137 Mr. Robert M. Fillmore .,

State Coporation Comission Brian P. Cassidy, Regional Counsel State of Kansas Federal Emergency Management Agency Fourth Floor, State Office Building

, Region I Topeka, Kansas 66612 1

J. W. McCormack POCH Boston, Massachusetts 02109 Senior Resident Inspector / Wolf Creek NPS c/o U.S. Nuclear Regulatory Comission

. Terri Sculley, Director P. O. Box 311 Special Projects Division Burlington, Kansas 66839 Kansas Corporation Comission State Office Building, Fourth Floor Topeka, Kansas 66612 Mr. Gerald Allen Public Health Physicist Bureau of Air Quality & Radiation Control Division of Environment ,

Kansas Department of Health and Environment Forbes Field Building 321 Topeka, Kansas 66620 e

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,DISTRfstfMONi Q\0Cr MAR 0 51986

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