ML20073A033
| ML20073A033 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 04/05/1983 |
| From: | Musolf D NORTHERN STATES POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8304110637 | |
| Download: ML20073A033 (3) | |
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/Xf Northem States Power Company 414 Neokt Mau Minneapoks, Minnesota 55401 Telephone (612) 330 5500 April 5,1983 Director Office of Nuclear Reactor Regulation U S Nuclear Regulatory Commission Washington, DC 20555 MONTICELID NUCLEAR GENERATINC PLANT Docket No. 50-263 License No. DPR-22 Request for Relief from the Requirments of 10 CFR 50, Section 50.48(b) for Fire Zone 9 - Control Room Reference (a) Letter from D M Musolf (NSP) to NRR, " Fire Protection and Safe Shutdown Analysis for Meeting the Requirements of Append ix R,"
dated June 30, 1982.
(b) Letter from D M Musolf (NSP) to NRR, " Clarification of Information Provided in Support of Request for Relief from Requirments of 10 CFR Part 50, Appendix R, Section III.G,"
dated October 28, 1982.
(c) Letter from D M Musolf (NSP) to NRR " Disposition of Unresolved Appendix R Exemption Requests," dated March 22, 1983.
The purpose of this letter is to request in accordance with the provision of 10 CFR Part 50, Section 50.12, an exemption from the requirements of 10 CFR Part 50, Section 50.48, paragraph (b).
Specifically, Northern States Power Company requests relief from the requirements to install a fixed suppression system in the Control Room (Fire Zone 9) as required by Appendix R,Section III.G.3.b, for zones provided with alternate shutdown capability.
Previously,. we had requested an exemption from the requirements of Section III.G.2. of Appendix R for the Control Room as stated in refer-ence (a) and further substantiated in reference (b).
In a working level meeting March 8,1983 with NRC Staf f to discuss proposed modifications in support of this request, NSP learned of the stringent criteria establish-ed by the Staff for an exemption from III.C.2 for the Control Room. For reasons of practical feasibility and fire safety, we now plan to satisfy the requirements of III.C. 3 in this zone.
Subsequently NSP will provide alternate shutdown capability as described in reference (c).
8304110637 830405 h[
hDRADOCK 05000263 PDR
e NORTHERN CTATEO POWER COMPANY Dir of NRR April 5,1983 Page 2 The installation of the fixed suppression system in the Control Room required by Section III.G. 3 would have an adverse impact on equipment and personnel by an inadvertent initiation.
In support of an exemption from installing a fixed suppression system the following information is provid ed :
- 1. The control room is continuously manned in accordance with the plant technical specifications.
- 2. There is only a light combustible loading in the room.
- 3. Transient combustible loadings are controlled by administrative proced ures.
- 4. Portable carbon dioxide and halon fire extinguishers are located in the control room and a manual hose station is immediately available outside the entrance.
- 5. Isolation dampers are provided in the ventilation ducts to maintain habitability.
- 6. Self-contained breathing units are located in the room.
- 7. The design of the control panels is such that metal barriers are installed between the required safe shutdown system functioca in the control room.
- 8. Ten ionization detectors exist to provide early detection of possible fires.
Because the Control Room is continuously manned and has the above described fire protection features, there is reasonable assurance that a fire would be promptly extinguished. Therefore, an exemption from the requirements of this part of the regulations will not endanger life or property or the common defense and security and is otherwise in the public interest.
Additionally, proposed modifications previously described in support of an exemption from III.G.2 for the Control Room will not be implemented since they are no longer necessary.
Please contact us if you have any questions related to this request, or if we can furnish additional information related to this issue.
bm David Musolf Manager - Nuclear Suppor ervices DMM/KNC/js cc:
Secretary of the Commission (orig + 2 copies)
Regional Admin-III, NRC NRR Project Manager, NRC Resident Inspector, NRC C Charnoff
UNITED STATES NUCLEAR REGULATORY COMMISSION NORTHERN STATES POWER COMPANY MONTICELID NUCLEAR CENERATING PLANT Docket No. 50-263 LETTER DATED APRIL 5, 1983 REQUEST FOR RELIEF FROM THE REQUIREMENTS OF 10 CFR PART 50, SECTION 50.48(b)
FOR FIRE ZONE 9 - CONTROL ROOM Northern States Power Company, a Minnesota corporation, by this letter dated April 5,1982 hereby submits a request for relief from the requirements of 10 CFR 50. Sections 50.48 (b); specifically, Appendix R,Section III.C. 3.b.
This letter contains no restricted or other defense information.
NORTHERN STATES POWER COMPANY By
/s/ David Musolf David Musolf Manager - Nuclear Support Services On this 5th day of April 1983, before me a notary public in and for said County, personally appeared David Musalf, Manager - Nuclear Support Servicca, and being first duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Company, that he knows the contents thereof and that to the best of his knowledge, information and belief, the statements made in it are true and that it is not interposed for delay.
/s/ Betty J. Dean Betty J. Dean Notary Public - Hinnesota Ramsey County My Commission Expires Dec. 16, 1987 l
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