ML18149A064
| ML18149A064 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 03/20/1986 |
| From: | Rubenstein L Office of Nuclear Reactor Regulation |
| To: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8603270013 | |
| Download: ML18149A064 (2) | |
Text
Docket No. 50-280 and 50-281 Mr. W. L. Stewart e
MAR 2 o 19GS Vice President - Nuclear Operations Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261
Dear Mr. Stewart:
SUBJECT:
REPORTS ON PRA INSIGHTS DISTRIBUTION Docket File NRC PDR Local PDR PAD#2 Rdg T. Novak OELD E. Jordan B. Grimes e
J. Partlow T. Chan C. Vogan ACRS (10)
Gray File 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 comments and suggestions are welcome on these reports.
Enclosures:
As stated cc w/o enclosures: See next page PM:PAD#2 TChan:hc 3{/fi D:PAD#2 LRubenstein
~
Sincerely, Lester S. Rubenstein, Director
. PWR Project Di recto rate #2 Division of PWR Licensing-A
Mr. W. L. Stewart Virginia Electric and Power Company cc:
Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535 Richmond~ Virginia 23213 Mr. Robert F. Saunders, Manager Surry Power Station Post Office Box 315 Surry, Virginia 23883 Donald J. Burke, Resident Inspector Surry Power Station U.S. Nuclear Regulatory Commission Post Office Box 166, Route 1 Surry, Virginia 23883 Mr. Sherlock Holmes, Chairman Board of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683 W. T. Lough Virginia Corporation Commiss.ion Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23209 Mro J. Ho Ferguson Executive Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond~ Virginia 23261 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 James B. Kenley, M.D., Cormnissioner Department of Health 109 Governor Street Richmond, Virginia 23219
- -.-'-~
e Surry Power Station Attorney General Supreme Court Building 101 North 8th Street Richmondi Virginia 23219