ML20206H402
| ML20206H402 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 06/13/1986 |
| From: | Bernero R Office of Nuclear Reactor Regulation |
| To: | Agosti F DETROIT EDISON CO. |
| References | |
| NUDOCS 8606260059 | |
| Download: ML20206H402 (3) | |
Text
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&.26 DIST_RIBUTION:
Docket No. 50-341 June 13, 1986 Docket Files NRC PDR Mr. Frank Agosti Local PDR Vice President-Nuclear Operations Detroit Edison Company PRC System 6400 North Dixie Highway Newport, Michigan 48166
Dear Mr. Agosti:
Subject:
Deco Request for an Emergency Amendment to the Fermi-2 Technical Specifications Regarding the Degraded Grid Voltage Setpoints We have received and reviewed your letter dated June 11, 1986, requesting an emergency amendment to the Fermi-2 Technical Specifications that would revise upwards the relay setpoints for Division I.
These setpoints were established in the Technical Specifications to protect the electrical equipment in both divisions.
We find that there is insufficient basis in your letter to justify issuing an emergency amendment to the Fermi-2 Technical Specifications pursuant to the provisions of Section 50.91(a)(5) of 10 CFR Part 50.
However, we find that there is sufficient basis for us to grant relief for a limited time from any restrictions on your present operations which might otherwise arise from a consideration of the degraded grid setpoints for Division I.
Our concern in this matter is that if the degraded grid setpoints are raised too high (i.e., to 95 percent of the nominal 4160 volts on the safety-related buses), there could be an increased probability of a reactor trip and an automatic start of the Division I emergency diesel generators (EDGs) if there were any problems with the nonsafety related voltage regulation devices on the 4160 volt transformer.
We also recognize that if the present values of these setpoints are too low, some of the motors on the motor-operated valves might be damaged in the event of a low grid voltage on the 120 KV line feeding into the switchyard.
i Balancing these two concerns, we conclude that the best compromise for the short-term is to maintain the present values of the Division I degraded grid setpoints. Accordingly, we reject your request in your letter of June 11, 1986, and require that you maintain the present setpoints until you can submit a more detailed, thorough proposal on this matter.
To expedite this process, we suggest that you meet with us as soon as you are prepared to discuss this matter.
Our basis for our position is that there is minimal risk to public health and safety since:
1.
There is a very small fission product inventory in the Fermi-2 reactor core.
The plant was operated at less than five percent of rated power for a fraction of the time from June 21, 1985, to October 11, 1985, and has been shutdown since from October to the present.
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Mr. Frank Agosti 2.
The automatic load tap adjusting device on the Division I 4160 volt transformer has operated reliably for a number of years even though not qualified for Class 1E application.
This device has demonstrated it can maintain the 4160 volt safety-related buses within a narrow range around the nominal voltage independent of the voltage variations on the 120KV line.
3.
The setpoints will be maintained at their present values for a limited period of time. We anticipate that your meeting with us, your subsequent submittal and our evaluation can be completed within five to six weeks.
With respect to your intention to declare Division I operable when all surveillances and modifications have been made, we conclude that it is in the i
public interest that you do so with the present values of the Division I degraded grid setpoints. We find that the additional surveillances you intend to conduct on the Division II EDGs will enhance the reliability of the safety-related systems and components and, therefore, represent good cause.
Furthermore, as discussed above, the action we are taking will not place the plant in an unsafe condition.
Sincerely, Robert M. Bernero, Director Division of BWR Licensing Office of Nuclear Reactor Regulation cc:
See attached list Distribution Docket File JPartlow NRC PDR NThompson Local POR DLynch j
PD#3 Reading EHylton RBernero ACRS (10)
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i Dr. Wayne Jens Detroit Edison Company Fermi-2 Facility I
cc:
Mr. Harry H. Voigt, Esq.
Ronald C. Callen LeBoeuf, Lamb, Leiby & MacRae Adv. Planning Review Section 1333 New Hampshire Avenue, N. 'W.
Michigan Public Service Commission Washington, D. C. 20036 6545 Mercantile Way P. O. Box 30221 John Flynn, Esq.
Lansing, Michigan 48909 Senior Attorney The Detroit Edison Company Regional Administrator, Region III 2000 Second Avenue.
U. S. Nuclear Regulatory Commission Detroit, Michigan 48226 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Dennis R. Hahn, Chief Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health P. O. Box 30035 Lansing, Michigan 48909 Mr. Robert Woolley Acting Supervisor-Licensing The Detroit Edison Company Fermi Unit 2 6400 No. Dixie Highway Newport, Michigan 48166 Mr. Paul Byron U. S. Nuclear Regulatory Commission Resident Inspector's Office 6450 W. Dixie Highway Newport, Michigan 48166 Monroe County Office of Civil' Preparedness 963 South Raisinville Monroe, Michigan 48161 l
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