ML20137P361
| ML20137P361 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 01/23/1986 |
| From: | Martin R Office of Nuclear Reactor Regulation |
| To: | Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 8602050052 | |
| Download: ML20137P361 (5) | |
Text
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UNITED STATES
,8 NUCLEAR REGULATORY COMMISSION p,
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WASHINGTON, D. C. 20555
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,,3 Docket Nos.
50-352/353 Mr. Edward G. Bauer, Jr.
Vice President & General Counsel Philadelphia Electric Company Philadelphia, Pennsylvania 19101
Dear Mr. Bauer:
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 probabilistic risk assessments 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 method focuses on areas which are sensitive to the results and the overall perception of plant weaknesses and vulnera-bilities.
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 will be published in their final forms in approximately two months. These reports are being provided to you, as well as all other licensees, in advance of formal publication for ycur information.
Portions of the enclosed staff report which concern the Limerick plant are based on 9602050052 860123 DR ADOCK 050 2
Tf aftae
, an early version of the Limerick internal events PRA and should be considered accordingly.
If, after reviewing these reports, you wish to provide comments to the staff, please provide them by February 24, 1986.
Sincerely, L{s LS*
. E. Martin, Project Manac#r BWR Project Directorate No. 4 Division of BWR Licensir.q
Enclosures:
1.
" Insights Gained from Probabilistic Risk Assessments," S. M. Davis, NRC, September 20, 1984.
2.
' Probabilistic Risk Assessment (PRA) l Insights," NUREG/CR-4405, Brookhaven National Laboratory, December 1985.
cc: See next page
Mr. Edward G. Bauer, Jr Limerick Generating Station Philadelphia Electric Certpany Units 1 & 2 cc:
Troy B. Conner, Jr., Esquire Mr. Harvin I. Lewis Conner and ketterhahn 6504 Bradford Terrace 1747 Pennsylvania Ave, N.W.
Philadelphia, Pennsylvania 19149 Washington, D. C.
20006 Zori G. Ferkin Frank R. Ronano, Chairman Assistant Ccunsel Air & Water Pollution Patrol Governor's Energy Council 61 Forest Avenue 1625 11. Front Street Ambler, Pennsylvania 19002 fiarrisburg, Pennsylvania 17105 Federic M. Wentz Charles W. Elliott, Esquire County Solicitor Brcse & Poswistilo, 1101 Bldg.
County of Montgomery 325 N.10th Street f'
Courthouse Easton, Pennsylvania 18402 Norristown, Pennsylvania 19404 Eugene J. Bradley Ms. M. Mulligan Philadelphia Electric Company Limerick Ecology Action Associate General Counsel 762 Queen St.
l 2301 Market Street Pcttstown, Pennsylvania 19464 i
Philadelphia, Pennsylvania 19101 I
Mr. Karl Abraham Thomas Gerusky, Director Public Affairs Officer Eureau of Radiation Protection Region I Dept. of Enviromental Resources U.S. Nuclear Regulatory Comission 5th Floor, Fulton Bank Bldg.
631 Park Aver.ue Third and Locust Streets King of Prussia, PA 19806 Harrisburg, Pennsylvania 17120 Mr. Gene Kelly Senior Resident inspector j'
U.S. kuclear Regulatory Commission P. O. Box 47 Sanatoga, Pennsylvania 19464
Philadelphia Electric Company Limerick Generating Station 1/2 cc:
Sugarrr.an, Denworth & Hellegers Director, Pennsylvania Emergency 16th Floor Center Plaza Management Agency 101 North Broad Street Basement, Transportation &
Philadelphia, Pennsylvania 19106 Safety Building Harrisburg, Pennsylvania 17120 Robert L. Anthony Angus Love, Esq.
Friends of the Earth 107 East Main Street of the Delaware Valley Norristown, Pennsylvania 19402 103 Vernon Lane, Box 186 Moylan, Pennsylvania 19065 Helen F. Hoyt, Chainnan g;-
Kathryn S. Lewis, Esq.
Administrative Judge Municipal Services Bldg.
Atomic Safety & Licensing Board 15th and JFK Blvd.
U.S. Nuclear Regulatory Comission Philadelphia, Pennsylvania 19102 Washington, D. C.
20555 David Wersan Esq.
Dr. Jerry Harbour Assistant Ccosurrer Advocate Administrative Judge Office of Consumer Advocate Atonic Safety & Licensing Board 1425 Strawberry Square U.S. Nuclear Regulatory Comission Harrisburg, Pennsylvania 17.120 Washington, D. C.
20555 Steven P. Hershey, Esq.
Dr. Richaro F. Cole Comunity Legal Services, Inc.
Administrative Judge Law Center horth Central - Bevry Bldg.
Atomic Safety & Licensing Board 3701 North Board Street U.S. Nuclear Regulatory Comission Philadelphia, Pennsylvania 19140 Washingtcn, D. C.
20555 Mr. J. T. Robb, NS-1 Mr. Spence W. Perry, Esq.
Philadelphia Electric Corrpany Associate General Counsel 2301 Market Street Federal F.r:ergency Management Agency Philadelphia, Pennylsvania 19101 Room 840 500 C St., S.W.
Timothy R. S. Campbell, Directcr Washington, D. C.
20472 Department of Emergency Services 14 East Biddle Street West Chester, Pennsylvania 19380 I
o
. an early version of the Limerick internal events PRA and should be considered accordingly.
If, after reviewing these reports, you wish to provide comments to the staff, please provide them by February 24, 1986.
Sincerely, Originni Simd by R. E. Martin, Project Manager l
BWR Project Directorate No. 4 i
Division of BWR Licensing
, DISTRIBUTION LDocket. File
Enclosures:
NRC PDR 1.
" Insights Gained from Probabilistic Local PDR Risk Assessments," S. M. Davis, NRC, PD#4 Reading September 20, 1984.
RBernero Vogler, OELD 2.
"Probabilistic Risk Assessment (PRA)
EJordan Insights," NUREG/CR-4405, Brookhaven BGrimes National Laboratory, December 1985.
JPartlow RMartin EHylton ACRS (10) cc: See next page Q#,4>h"
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