ML20041F962
| ML20041F962 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 03/11/1982 |
| From: | Parker W DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8203170594 | |
| Download: ML20041F962 (2) | |
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DUKE POWER COSIPANY Powzu BustutNo 422 SouTu Cncucu STHEET, CHAHLOTTE, N. C. aaa42 wn. uni o. panna.sa.
March 11, 1982 vier earsierut Tctc o-w: Aaca 7o4 g
Srtame Paoovction 373-4083 S
9 HECEIVT:D Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation t
MARIt1982> %
U. S. Nuclear Regulatory Commission gg Washington, D. C.
20555 amasuasa g
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/z Attention:
Ms. E. G. Adensam, Chief Licensing Branch No. 4 m
Re: McGuire Nuclear Station, Unit 1 Docket No. 50-369 Restart of Unit 1 Following ECT Outage
Dear Mr. Denton:
This letter is to follow up a conversation between myself and members of your staff on the afternoon of March 10, 1982. As discussed in that conversation, outage wo'rk on Unit 1 is near completion and it is expected that the unit will be ready for startup on or about March 14, 1982.
Mr. R. L. Tedesco's letter of F2bruary 22, 1982 requested a report be submitted "well in advance" of the proposed restart date in order to give the NRC Staff adequate time for review of the report. Such a report is in the advanced stages of preparation. However, due to the relatively short duration of the outage and the fact that four small wear indications were noted during the ECT, it is not possible to submit this report "well in advance" of the restart date.
Ultimately, our objective is to operate the unit at 75% power for a period of 60 days prior to shutting down for the next ECT. Our justification for this program will be outlined in detail.in the above mentioned report.
In order to not delay the planned restart of the unit the following alternative is proposed:
- Startup and increase power to 50%
- Increase power to 75%, stopping at several intermediate power levels to obtain data from installed instrumentation
- Reduce power to 50%
- Hold at 50% for a reasonable period of time to give NRC Staff oppor-tunity to review detailed report
- Increase power to 75% with NRC Staff concurrence.
The period of time above 50% power is expected to be on the order of I day. This short excursion to 75% power immediately after startup is desirable due to the possibility that one or more of the sensors may fail prematurely due to the environment in the steam generator. Also, results obtained from the accelero-meter data at McGuire may prove useful to Westinghouse for comparison to Almaraz results.
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-Mr. Harold R. Denton March 11, 1982 Page 2 Duke has operated McGuire Unit 1 at 50% power for approximately 1100-hours.
Given that four tubes in the 'C' steam generator experienced minor wear
(<20%) and assuming that this wear occurred at 50% (which it did not), then the unit could be operated for another 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> and still not exceed the plugging criteria of 40%. More importantly it is generally accepted that operation at 50% power does not cause premature fretting wear of the tubes and in fact Westinghouse has recommended this power level to both Ringhals and Almaraz.for interim operation. The conclusion to be drawn is that opera-tion of McGuire at 50% power pending NRC review of Duke's proposal to operate at 75% power is safe, prudent and represents no potential public health and safety concerns.
Your timely review of this proposal would be appreciated. -Please advise if there are any questions regarding this matter.
Very/ truly your,
'i.s
... _. - L3.
William O. Parker, J CAC/j fw cc:
Mr. James P. O'Reilly, Regional Administrator Mr. P. R. Bemis U. S. Nuclear Regulatory Commission Senior Resident Inspector-NRC Region II McGuire Nuclear Station 101 Marietta Street, Suite 3100 Atlanta, Georgia. 30303 l
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