ML19225C683
| ML19225C683 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 06/15/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7908020168 | |
| Download: ML19225C683 (4) | |
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June 15, 1979 Docket No. 50-344 Mr. Charles Goodwin, Jr.
Assistant Vice President Portland General Electric Company 12' SW Salmon Street Portland, Oregon 97204
Dear Mr. Goodwin:
In conducting our review of your letter of April 25, 1979, relating to containment tendon surveillance at Trojan Nuclear Plant, we have several additional comments regarding this program which we request that you address.
These comments are listed in the enclosure.
~
You are requested to respond to items (1) and (2) within 30 days of your receipt'of this letter.
Your response to item (3) should be in-cluded with your upcoming revision to License Change Application No.15, which our letter of January 26, 1979 requested that you submit within 60 days followi;.g publication of Regulatory Guide 1.35 Rev. 3, as an effective guide.
We wish to emphasize that your amended license change application should give appropriate consideration to this revised guicance and our comments regarding your tendon surveillance program or fully justify any alternative surveillance plans.
Sincerely, ufLBSlW A. Schwencer, Chief Operating Peactors Branch #1 Division Operating Reactors
Enclosure:
Coments cc: w/encicsure See next page 369 286 ggqeou s f
Mr. Charles Good,,in, Jr.
Portland General Electric Company June 15,1979 cc:
Mr. H. H. Phillips Donald W. Godard, Supervisor Portland General Electric Company Siting and Regulation 121 S.W. Salmon Street Gregon Department of Energy Portland, Oregon 97204 Labor and Industries Building Room 111 Warren Hastings, Esquire Salem, Oregon 97310 Counsel for Portland General Electric Company Director, Technical Assessment Division 121 S.W. Salmon Street Of fice of Radiation Programs ( AW-459)
Portland, Oregon 97204 U. S. Environmental Protection Agency Crystal Mall #2 Mr. J. L. Frewing, Manager Arlington, Virginia 20460 Generation Licensing and Analysis Portland leneral Electric Compcny U. S. Environmentu! Protection Agency 121 S.W..'Iman Street Region X Offic ?
Portland, Oregon 97204 ATTN:
EIS C00a0lNATOR 120C 'th Avenue Columbia County Courthouse Seat..e, Washington 98101 Law Library, Circuit Court Room St. Helens, Oregon 97501 Director, Pregon Department af Energy Labor and Industries Building, Room 111 Salem, Oregon 97310 kichard M. Sandvik, Esquire Counsel for Oregon Energy Facility Siting Counsel and Oregon Department of Energy 500 Pacific Building 520 S.W. Yamhill Portland, Oregon 97204 Michael Malmrose U. S. Nuclear Regulatory Commission Trojan Nuclear Plant P. O. Box 0 Rainier, Oregon 97048 Robert M. Hunt, Chairman Board of County Commissioners Columbia County St. Helens, Oregon 97051 369 287
ADDITIONAL COMMENTS ON VOLUMES 1 AND 2 0F THE ONE YEAR TENDON SURVEILLANCE REPORT AND REQUEST FOR ADDITIONAL INFORMATION ON SURVEILLANCE PROGRAM TROJAN NUCLEAR PLANT 00LKET NO. 50-344l 1.
NRC Comment #1
- The staff cancern was with possible bias in the selection of inspection hoop tendons.
Your response does rot alleviate the staff's concern.
Your response is based on the fact that so.Te tendons are near the safety valves and therefore their inspection when t;p plant is in operation may be hazardous for the inspection personnei, You also add that the next surveillance is tentatively planned to be per-formed concurrently with a scheduled plant shutdown and that in this case the inspection will be performed on tendons adjacent to the safety valves.
Your suggestion is not in compliance with R. C.
1.35 Rev. 3.
Regulatory position C.2.4 recommends the selection of tendons in a random but representative manner to include the tendons from typical areas, areas of structural discontinuities, and areas around hot penetrations.
Since tendons near the safety valves are especially susceptible to damage, the staff feels that such tendons should be included in the sample population.
Regulatory position C.2.4 also states that to develop a history and to correlate the observed data, one tendon from each group may be kept unchanged after the initial selection.
Indicate the inspection procedure which would reconcile your approach with position C.2.4.
- Also, discuss in detail the condition of concrete in the area of the relief valves where no tendons have yet been inspected.
Discuss in detail the methods by which this has been determined (e.g. optical devices) and any conclusions regarding the adequacy of these tendons.
2.
NRC Comment #2 The staff concern is with the continuity of the wires.
You report that visual inspection of four tendons in tension, during detensioning, during and after retensioning, and also during efforts to free the stressing washers did not indicate any evi-dence r f broken wires. However, on a fifth tendon, there was evidence of two broken wires.
This result (one of five) is rather high, and larger than we would have expected.
- Discuss, as previously requested, your ability to detect broken wires by traction, if needed by moving the stressing washers.
Discuss in detail the implications on tendon ir.tegrity of not being able to move the stressing washers on several tendons, including a discussion of the reasons they cannot be meved.
- See NRC letter dated January 26, 1979 for the basic comments which are being supplemented herein as a result of your April 25, 1979 respon'as.
3h
3.
NRC Comment # 6 The staff discussed previously in detail our concerns for other Bechtel jobs (e.g. Arkansas Nuclear 1, Calvert Cliffs, etc.).
The report prepared by Bechtel Corporation and dated February 1978, attached to your letter of April 25: 1979 does not consider,as requested, R.G. l.35 Rt.v. 3 and R. G. 1.35,1 Please include this information when you submit your amended license change application.
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