ML20129J006
| ML20129J006 | |
| Person / Time | |
|---|---|
| Issue date: | 07/05/1985 |
| From: | Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Pate Z INSTITUTE OF NUCLEAR POWER OPERATIONS |
| Shared Package | |
| ML20129H990 | List: |
| References | |
| NUDOCS 8507220134 | |
| Download: ML20129J006 (4) | |
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JUL 0 51985 Dr. Zack Pate, President Institute of Huclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339
Dear Dr. Pate:
Subject:
Request for Peer Review Comments - Preliminary Case Study Report --
Decay Heat Removal Problems at U.S. Pressurized Water Reactors A preliminary case study on DHR losses at operating PWRs is attached. The study analyzes 130 losses of DHR systems at U.S. PWRs between 1976 and 1983 and notes that for some likely events, a loss of DHR can result in core uncovery within one to three hours.
Our case study report indicates the root causes of the DHR losses, and it examines specific actions that have been taken at several plants to improve the availability of their DHR systems. The report makes six recommenda-tions, which if implemented, will significantly reduce the frequency, duration and severity of loss-of-UHR events.
In accordance with our " peer review" process prior to the finalization and distribution of our case study reports, we are providing NRR, IE, Regional Offices, RES, HSAC and INP0 with a copy of a preliminary report for review and Comment, particularly regarding accuracy and Completeness of the technical details. Changes to the findings, conclusions, and recommendations will be considered only if the underlying information concerning the details of plant design or systems operation is in error. Therefore, comments are being solicited on the technical accuracy of tr.e report. The findings, conclusions, and recommendations are provided for your information in order that you may understand the significance AEOD places on these events and, therefore, obtain a more complete picture of the total report. We would welcome comments either informally by telephone or formally by meuorandum.
Since we wish to finalize and issue the report shortly, we ask that any comments be received by us within 30 days from receipt of the preliminary copy. Should you require some additional time beyond that point, please let us know; otherwise, it will be assumed that there are no comments.
8507220134 850705 PDR MISC 8507220107 PDR l
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['~Qf{~~~; ~~T ' ,w Ge-Dr. Zack Pate r As you may know, AEOD reports do not represent an official NRC position or the position of the responsible NRC program office. Our reports are one input to an ongoing review and evaluation process, and any reconnendation contained in our final report will be considered and perhaps modified or eliminated by the responsible NRC office.
A copy of the preliminary report and this letter are being placed in the Public Document Hoou at 1717 H Street, N.W. , Washington, D.C. 20555.
If you have any questions regarding this study, please feel free to contact Dr. Hal Ornstein at (301)492-4439.
Sincerely, h
C. J. Heltenes, Jr. , Director Office for Analysis and Evaluation of Operational Data
Enclosure:
As stated Distribution
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cc w/ enclosure:
Mr. R. Crouse, Vice President Mr. R. Dieterich, Mgr.
Nuclear Sacramento Municipal Utility District Toledo Edison Comoany 6201 S Street Edison Plaza - Stop 712 P.O. Box 15830 300 Madison Avenut! Sacramento, California 95852 Toledo, Ohio 4365;!
Mr. K. Baskin, Vice President Mr. H. Tucker, Vice President Nuclear Engineering Nuclear Production Safety and Licensing Department Duke Power Company Southern California Edison Company P.O. Box 33189 P.O. Box 800 422 Church Street 2244 Walnut Grove Avenue Charlotte, N.C. 28;!42 - Rosemead, California 91770 Mr. W. Wilgus, Vice President Mr. B. Withers, Vice President Nuclear Operations Portland General Electric Co.
Florida Power Corpcration 121 S. W. Salmon Street P.O. Box 14042; M.A.C. H-2 Portland, Oregon 97204 i St. Petersburg, Florida 33733 ,
Mr. A. Lundvall, Vice President Director of Nuclear Licensing Supply Commonwealth Edison Company Baltimore Gas and Electric Company P.O. Box 767 G & E Building Chicago, Illinois 60690 P.O. Box 1475 Baltimore, Maryland 21203 Mr. J. Shiffer, Vice President Nuclear Power Generation Mr. C..McNeill, Jr. Pacific Gas and Electric Co.
Vice President, Nuclear 77 Beale Street Public Service Electric & Gas Co. San Francisco, California 94106 P.O. Box 236 Hancocks Bridge, N.J. 08038 Mr. R. Kober, Vice President Electricity and Steam Production Mr. W. Stewart, Vice President Rochester Gas and Electric Corporation Nuclear Operations 89 East Avenue Virginia Electric and Power Company Rochester, N.Y.14649 P.O. Box 26666 Richmond, Virginia 23261 Mr. E. Rahe Nuclear Safety Department Mr. J. Dolan, Vice President Nuclear Technology Division Indiana and Michigan Electric Company Westinghouse Electric Corp.
c/o American Electric Service Corporation Box 355 1 Riverside Plaza Pittsburgh, PA.15230 Columbus, Ohio 43215 Dr. P. McGill, President Mr. J. Griffin Combustion Engineering, Inc.
Sr. Vice President of Energy Supply 1000 Prospect Hill Road Arkansas Power and Light Co. Windsor, Connecticut 06095 P.O. Box 551 Little Rock, Arkansas 72203
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cc w/ enclosure:
(continued)
- T. Foley, S.R.I., RI
-T. Kenny, S.R.I., RI W. Cook, R.I., RI M. Branch, S.R.I, RII J. Bryant, S.R.I. , RII W. Orders, S.R.I., RII P. Skinner, S.R.I RII T. Stetka, S.R.I, RII B. Jorgensen, S.R.I., RIII M. Holzmer, S.R.I. , RIII W. Rogers, S.R.I., RIII W. Johnson, S.R.I., RIV M. Medonca, S.R.I. , RV S. Richards, S.R.I., RV R. Birkel, NRR A. DeAgazio, NRR L. Engle, NRR D. Fisher, NRR D. Jaffe, NRR K. Jabbour, NRR R. Lee, NRR E. McKenna, NRR S. Miner, NRR C. Miller, NRR A. Nicholaris, NRR J. Norris, NRR W. Paulson, NRR H. Schierling, NRR H. Silver, NRR C. Trammel, NRR' i
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