ML20137Y228
| ML20137Y228 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 03/03/1986 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 8603120197 | |
| Download: ML20137Y228 (2) | |
Text
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March 3, 1986 Docket No. 50-344 DISTRIBUTIDN w/o encl.
M cket File NRC POR L PDR Gray File PAD-3 Rdg H. Thompson Mr. Bart D. Withers DELD K. Johnston Vice President Nuclear JDNeighbors C. Vogan Portland General Electric Company E. Jordan B. Grimes 121 S.W. Salmon Street ACRS 10 Portland, Oregon 97204
Dear Mr. Withers:
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 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 celt 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.
Sincerely,
/s/JNorris j
I i
Steven A. Varga, Director PWR Project Directorate #3 i
Division of PWR Licensing-A i
Enclosures:
As stated CC:
See next page D/ND3 PAD-3 PAD-3
,RT 1 CVonantN KJohnst6n/pws W
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Mr. Bart D. Withers Portland General.Eletric Company Trojan Nuclear Plant cc:
Senior Resident Inspector U.S. Nuclear Regulatory Commission Trojan Nuclear Plant Post Office Box 0 Rainier, Oregon 97048 Robert M. Hunt, Chairman Board of County Commissioners Columbia County St. Helens, Oregon 97501 William T. Dixon Oregon Department of Energy Labor and Industries Building Room 111 Salem, Oregon 97310 Regional Administrator, Region V U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 1450 Maria Lane, Suite 210 Walnut Creek, California 94596