ML20140E059
| ML20140E059 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 03/20/1986 |
| From: | Rubenstein L Office of Nuclear Reactor Regulation |
| To: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8603270173 | |
| Download: ML20140E059 (2) | |
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Docket No. 50-338 DISTRIBUTION and 50-339 N
J. Partlow MAR 2 01996 NRC PDR L. Engle Local PDR P. Kreutzer Mr. W. L. Stewart PAD #2 Rdg ACRS-(10) l Vice President - Nuclear Operations T. Novak Gray File Virginia Electric and Power Company OELD Post Office Box 26666 E. Jordan 1
Richmond, Virginia B. Grimes l
j
\\
Dear Mr. Stewart:
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 PRAs regarding the factors which dominate the i
risk associated with nuclear power plants. This effort includes identification i
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 r.nd vulnerabilities.
In particular these reports contain discussions of: general insights on plant i
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 i
into PRA methodologies; and the contribution to measures of risk (core melt frequency and consequences of radioactive releases) from systems, components
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and events.
These reports are being provided to you, as well as all other licensees, in advance of formal publication for your information. Your coments and
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suggestions are welcome on these reports.
Sincerely, 4
Lester S. Rubenstein, Director PWR Project Directorate #2 Division of PWR Licensing-A j
Enclosures:
As staten cc w/o enclosures: See next page PM:P D*J LEnge: he L'RL in 3/1h/86 3/M86 j
B603270173 060320 PDR ADOCK 05000338 p
i Mr. W. L. Stewart North Anna Power Station J
Virginia Electric & Power Company Units 1 and 2 CC:
Richard M. Foster, Esq.
Atomic Safety and Licensing Appeal Cockrell, Quinn & Creighton Board Panel 516 Cherry Tower U.S. Nuclear Regulatory Commission 920 South Cherry Street Washington, DC 20555 Denver, Colorado 80222 Regional Administrator, Region II Michael W. Maupin, Esq.
U.S. Nuclear Regulatory Commission Hunton, Williams, Gay and Gibson Office of Executive Director P. O. Box 1535 for Operations Richmond, Virginia 23212 101 Marietta Street N.W., Suite 2900 Atlanta, Georgia 30323 Mr. W. T. Lough Virginia Corporation Commission Mr. E. W. Harrell Division of Energy Regulation P. O. Box 402 P. O. Box 1197 Mineral, Virginia 23117 Richmond, Virginia 23209 Old Dominion Electric Cooperative Ellyn R. Weiss, Esq.
c/o Executive Vice President Harmon, Weiss and Jordan Innsbrook Corporate Center 2001 S Street NW 4222 Cox Road, Suite 102 Washington, DC 20009 Glen Allen, Virginia 23060 Mr. J. H. Ferguson Mr. Richard C. Klepper Executive Vice President - Power Board of Supervisors i
Virginia Electric and Power Co.
Louisa County Courthouse Post Office Box 26666 P. O. Box 27 Richmond, Virginia ?3261 Louisa, Virginia 23093 Mr. Anthony Gambardella Office of the Attorney General Supreme Court Building 101 North 8th Street Richmond, Virginia 23219 I
Resident Inspector / North Anna i
c/o U.S. NRC Senior Resident Inspector Route 2, Box 78 Mineral, Virginia 23117 Mrs. Margaret Dietrich Route 2, Box 568 Gordonsville, Virginia 22042 Mr. Paul W. Purdom Environmental Studies Institute Drexel University 32nd and Chestnut Streets i
Philadelphia, Pennsylvania 19104 i
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