ML20154M391
| ML20154M391 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/05/1986 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | Schnell D UNION ELECTRIC CO. |
| References | |
| NUDOCS 8603140174 | |
| Download: ML20154M391 (3) | |
Text
,_
b o.
Docket No. 50-483 5W Mr. D. F. Schnell Vice President - Nuclear Union Electric Company Post Office Box 149 St. Louis, Missouri 63166
Dear Mr. Schnell:
Subject:
Reports on PRA Insights - Callaway Unit 1 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 iniportant 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 conenents and suggestions are welcome on these reports.
Sincerely, Original signed by:
D. Hood B. J. Youngblood, Director PWR Project Directorate #4 Division of PWR Licensing-A, NRR
Enclosures:
As stated cc w/o enclosure:
See next page
/
p 3/f I
PWRf hPWR-A PWRf4:DPWR-A PWR#4:DPWR-A M(rJh$h:kab P0'Connor BJYoungblood 03/' /86 03/ 5 /86 03/ g /86 8603140174 960305 Dft ADOCK O 3
-4
g J '..*
b$ 0 $ 1986 Mr. D. F. Schnell Callaway Plant Union Electric Company Unit No. I cc:
Mr. Nicholas A. Petrick Lewis C. Green, Esq.
Executive Director - SNUPPS Green, Hennings & Henry 5 Choke Cherry Road Attorney for Joint Intervenors Rockville, Maryland 20850 314 N. Broadway, Suite 1830 St. Louis, Missouri 65251 Gerald Charnoff, Esq.
Thomas A. Baxter, Esq.
Ms. Marjorie Reilly Shaw, Pittman, Potts & Trowbridge Energy Chairman of the League of 1800 M Street, N. W.
Women Voters of Univ. City, M0 Washington, D. C.
20036 7065 Pershing Avenue University City, Missouri 63130 Mr. J. E. Birk Assistant to the General Counsel Mr. Donald Bollinger, Member Union Electric Company Missourtans for Safe Energy Post Office Box 149 6267 Delmar Boulevard St. Louis, Missouri 63166 University City, Missouri 63130 D. S. Nuclear Regulatory Commission Mr. Dan I. Bolef, President Resident Inspectors Office Kay Drey, Representative RR#1 Board of Directors Coalition Steedman, Missouri 65077 for the Envi onment St. Louis Regian Mr. Donald W. Capone, Manager 6267 Delmar B:ulevard Nuclear Engineering University Ci*.y, Missouri 63130 Union Electric Company Post Office Box 149 St. Louis, Missouri 63166 Chris R. Rogers P.E.
Manager - Electric Department 301 W. High -
Post Office Box 360 Jefferson City, Missouri 65102 Regional Administrator U. S. NRC, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P. O. Box 176 Jefferson City, Missouri 65102 Mr. Glenn L. Koester Vice President - Nuclear Kansas Gas and Electric Company 201 North Market Street Post Office Box 208 Wichita, Kansas 67201
l1 a
MAR 051986
/O gyh q;d,
f0 TRIBUTION:
N L POR NSIC PRC System PWR#4 R/F MDuncan TAlexion P0'Connor BJYcungblood R/F EJordan BGrimes JPartlow ACRS (10)
OELD EWeinkam
.