ML19345F184
| ML19345F184 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 01/30/1981 |
| From: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19345F185 | List: |
| References | |
| NUDOCS 8102090366 | |
| Download: ML19345F184 (2) | |
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V alus January 30, 1981 Trojan Nuclear Plant Docket 50-344 License NPF-1 Director of Nuclear Reactor Regulation ATTN:
Mr. Robert A. Clark, Chief Operating Reactors Branch No. 3 Division of Licensing U. S. Nuclear Regulatory Commission Washingten, D. C. 20555
Dear Sic:
In accordance with your letter of May 22, 1980, and aut, sequent agreements made with your staff at meetings on September 30 and December 17, 1980, please find attached our assesment of the U-bends removed from Trojan steam generator "D".
This final report consists of the following:
- 1. - History of U-Bend Cracking in Trojan Row 1 Steam Generator Tubes.
- 2. - Westinghouse report entitled, "Charac-terization of U-Bends Removed from Trojan Steam Generator
'D'".
- 3. - Portland General Electric Company's Dis-cussion of the Westinghouse report.
- 4. - Portland General Electric Company's Summary of Battelle Memorial Institute-Pacific Northwest Labora-tories Interim Examination Results. With respect to this attachment, it should be noted that Battelle's work is being conducted under an EPRI program and is included herein for completeness, with EPRI's permission.
As can be seen from Attachment 1, steam generator tube leakage has escalated over the last several months of Plant operation, and although notasafetyconcern,hasbecomeundesirablefromanoperationsstandp While the individual and collective steam generator leak rates are well within license conditions, we have decided to schedule a maintenance shutdown to perform tube plugging operations. It is currently planned to plug tubes in steam generators "A" and "D",
as required, which constitute about 80 percent of the total leakage. This maintenance shutdown is
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expected to require 11 days, after which the Plant will resume operation until the annual refueling outage in April 1981.
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? r'.!crd Gered E:ectre Crgr,y Robert A. Clark January 30, 1981 Page two There is oo compromise in the Plant's safety by the actions proposed; the Plant accident analyses continue to be conservatively assessed, as previously discussed in our letter of November 4,1979 to R. H. Engelken.
Director Region V NRC. Consequently, resumption of operation of Trojan, following the planned plugging of tubes in steam generators "A" and "D",
will not constitute an undue risk to the health and safety of the public.
We intend to provide a letter to you following the maintenance shutdown discussed above. This letter will address the conditions found in steam generators "A" and "D", the tube plugging operations performed, and planned tube maintenance of steam generators "B" and "C" during the annual refueling shutdown in April 1981.
Sincerely, Bart D. Withers Vice President Nuclear Attachment c:
Mr. Lynn Frank, Director State of Oregon Department of Energy Mr. R. H. Engelken, Director U. S. Nuclear Regulatory Commission Region V l
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