ML20129J029
| ML20129J029 | |
| Person / Time | |
|---|---|
| Issue date: | 07/05/1985 |
| From: | Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Crouse R BABCOCK & WILCOX OPERATING PLANTS OWNERS GROUP, TOLEDO EDISON CO. |
| Shared Package | |
| ML20129H990 | List: |
| References | |
| NUDOCS 8507220158 | |
| Download: ML20129J029 (2) | |
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_s- L h JUL 0 5 E6 Mr. R. Crouse, Chairman B a W Owners' Group Toledo Edison Company Edison Plaza 300 Hadison Avenue Toledo, Ohio 43652
Dear Dr. Crouse:
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 OHR losses at operating PWRs is attached. The study analyzes 130 losses of DHR systems at U.S. PWRs between 1976 and 1963 and notes that for some likely events, a loss of DHR can result in core uncovery witnin 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 recomnenda-tions, which if implemented, will significantly reduce tne frequency, duration and severity of loss-of-DHR 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, NSAC and INPO with a copy of a preliminary report for review and com.aent, 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, connents are being solicited on the technical accuracy of the report. Tne findings, conclusions, and recommendations are provided for your inforuation in order that you may understand the significance AE00 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 memorandum.
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 cormaents.
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5 k Mr. R. Crouse As you may know, AE00 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 recommendation 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 Room at 1717 H Street, N.W., Washington. 0.C. 20555.
If you have any questions regarding this study, please feel free to contact Dr. Hal Ornstein at (301)492-4439.
Sincerely, t
/
C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data
Enclosure:
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