ML20153B030

Forwards RAI Re 970814 Request for Exemptions from Technical Requirements of Section III.G.2 of App R to Separation of Certain Redundant Safe Shutdown Circuits with fire-rater Barriers.Response Requested within 45 Days of Date of Ltr

ML20153B030
Person / Time
Site:	Prairie Island
Issue date:	09/17/1998
From:	Kim T NRC (Affiliation Not Assigned)
To:	Richard Anderson NORTHERN STATES POWER CO.
References
TAC-M99528, TAC-M99529, NUDOCS 9809220282
Download: ML20153B030 (4)

Text

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September 17, 1998 Mr. Roger O. And rson, Dir:ctor Nuclear En:rgy Engine: ring Northern States Power Company 414 Nicollet Mall Minneapolis, MN 55401

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE PRAIRIE ISLAND NUCLEAR GENERATING PLANT REQUEST FOR EXEMPTION FROM 10 CFR PART 50, APPENDIX R, SECTION lll.G.2, " FIRE F'ROTECTION OF SAFE SHUTDOWN CAPABILITIES"(TAC NOS. M99528 AND M99529)

Dear Mr. Anderson:

By letters dated August 14,1997, and April 16,1998, Northern States Power Company (NSP) ,

has requested exemptions from the technical requirements of Section Ill.G.2 of Appendix R to '

Title 10 of the Code of Federal Reaulations, Part 50, to the extent that it specifies the separation of certain redundant safe shutdown circuits with fire-rated barriers. Alternatively, NSP proposed to use fire-rated cables to replace portions of certain safe shutdown circuits at the Prairie Island Nuclear Plant.

In order to complete our review and evaluation of this exemption request, the staff requests that i

NSP provide additionalinformation as described in the enclosure. The plant staff has been informed of this information request. Please provide a response to the requested informatisn within 45 days from the date of this letter.

If you have any questions regardinp ihis matter, please contact me at 301-415-1392.

S!.'cere!y, '

Uk!G;NAL SIGNED BY:

l Tae Kim, Senior Project Manager Project Directc, rate ill-1 Division of Reactor Projects -Ill/IV Office of Nuclear Reactor Regulation ,

Docket Nos

50-282,50-306 l

l

Enclosure:

As stated y I cc w/ encl: See next page gg mE CEME.

l l DISTRIBUTION:

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% g ,o# September 17, 1998 l

Mr. Roger O. Anderson, Director Nuclear Energy Engineering Northern States Power Company 414 Nicollet Mali Minneapolis, MN 55401

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION CONCERNING THE PRAIRIE ISLAND NUCLEAR GENERATING PLANT REQUEST FOR EXEMPTION FROM 10 CFR PART 50, APPENDIX R, SECTION lli.G.2, " FIRE PROTECTION OF SAFE SHUTDOWN CAPABit.lTIES"(TAC NOS. M99528 AND M99529)

Dear Mr. Anderson:

By letters dated August 14,1997, and April 16,1998, Northern States Power Company (NSP) has requested exemptions from the technical requirements of Section Ill.G.2 of Appendix R to Title 10 of the Code of Federal Reaulations. Part 50, to the extent that it specifies the separation of certain redundant safe shutdown circuits with fire-rated barriers. Alternatively, NSP proposed to use fire-rated cables to replace portions of certain safe shutdown circuits at the Prairie Island Nuclear Plant.

In order to complete our review and evaluation of this exemption request, the staff requests that NSP provide additionalinformation as described in the enclosure. The plant staff has been informed of this information request. Please provide a response to the requested information within 45 days from the date of this letter.

If you have any questions regarding this matter, please contact me at 301-415-1392.

Sincerely,

. at 1 +~

Tae Kim, Senior Project Manager Project Directorate Ill-1 Division of Reactor Projects - lil/IV Office of Nuclear Reactor Re gulation Docket Nos: 50-282,50-306

Enclosure:

As stated cc w/ encl: See nexi page

O I

Mr. Roger O. Anderson, Director Prairie Island Nuclear Generating Northern States Power Company Plant cc:

J. E. Silberg, Esquire Site Licensing .

Shaw, Pittman, Potts and Trowbridge Prairie Island Nuclea, Generating 2300 N Street, N. W. Plant Washington DC 20037 Northern States Power Company ,

1717 Wakonede Drive East Plant Manager Welch, Minnesota 55089 )

Prairie Island Nuclear Generating i Plant Tribal Council Northern States Power Company Prairie Island Indian Community 1717 Wakonade Drive East ATTN: Environmental Department Welch, Minnesota 55089 5636 Sturgeon Lake Road Welch, Minnesota 55089 Adonis A. Neblett Assistant Attorney General Office of the Attorney General 455 Minnesota Street Suite 900 St. Paul, Minnesota 55101-2127 i

U.S. Nuclear Regulatory Commisrion Resident inspector's Office 1719 Wakonade Drive East Welch, Minnesota 55089-9642 Regional Administrator, Region lil U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, Illinois 60532-4351 Mr. Stephen Bloom, Administrator Goodhue County Courthouse Box 408 Red Wing, Minnesota 55066-0408 Kris Sanda, Commissioner Department of Public Service 121 Seventh Place East i Suite 200 l St. Paul, Minnesota 55101-2145 I l

l June 1996 I

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l REQUEST FOR ADDITIONAL INFORMATION REGARDING NSP'S REQUEST FOR EXEMPTION FROM SECTION lll.G.2 OF APPENDIX R TO 10 CFR PART 50 PRAIRIE ISLAND NUCLEAR GENERATING PLANT DOCKET NOS. 50-282 AND 50-306

1. Provide detail drawings or diagrams that depict the routing of the Firezone R cables and the basic features (equipment, storage, components, etc.) of the fire areas through which the Firezone R cables will pass. Provide a detailed description of the configuration that the Firezone R cable will be in, the type of cable (e.g.,3C14 AWG),

and the expected service loads that wi!! be required of the cables (voltage and current).

State the function of each cable, i.e., power, contro!, or instrumentation.

2. The Underwriters 1.aboratories (UL) test report on Rockbestos Firezone R Cable did not state the test standard to which it was conducted, the acceptance criteria for the tested cables,'or include a detailed test plan or test protocol. Please provide these elements.  ;

3. The UL test further states that leakage current measurements were taken during the full-scale fire test of the Rockbestos cable. The numerical results of the leakage current measurements were not recorded in the report. Provide the numerical values for leakage current in the Firezone R cables that were monitored during the test.

4. The UL fire test tested specific sizes of instrument and power Firezone R cables.

Demonstrate how the sizes of Firezone R control cables, which you propose to install, are bounded by the test.

l

5. State whether there are any non-continuous cable runs of Firezone R cable (i.e.,

splices) in the proposed applications, and if so, justify how they are bounded by the UL fire test. i

6. Provide clarification as to how the fire test report FCTR/94/0060 from Darchem l Industries (Attachment 3 to your submittal) demonstrates that the use of unprotected i unistrut for raceway support is acceptable.

I ENCLOSURE l