ML20045D660

Provides Response to Request for Addl Info Re Generic Ltr 92-08, Thermo-Lag 330-1 Fire Barriers.

ML20045D660
Person / Time
Site:	Prairie Island
Issue date:	06/24/1993
From:	Richard Anderson NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20045D661	List: ML20045D660 ML20045D710 ML20045D712
References
GL-92-08, GL-92-8, TAC-M85592, TAC-M85593, NUDOCS 9306290274
Download: ML20045D660 (4)

Text

w - -

I 4

Northem States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 1927 Telephone (612) 330-5500 June 24, 1993 US Nuclear Regulatory Commission 10 CFR Part 50 Attn: Document Control Desk Section 50.54(f)

Washington, DC 20555 l

PRAIRIE ISIAND NUCLEAR GENERATING PLANT Docket Nos, 50-282 License Nos. DPR-42 50-306 DPR-60 Response to a Request for Additional Information Related to Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers" (TAC Nos. M85592 and M85593)

Reference:

Letter from Marsha Gamberoni (US Nuclear Regulatory Commission),

dated May 18, 1993, titled " Prairie Island - Response to Generic Letter 92-08, 'Thermo-Lag 330-1 Fire Barriers'"

This letter provides our response to your letter (Reference) related to Generic Letter 92-08, "Thermo-Lag 330 1 Fire Barriers."

Recuest No. 1 In your response to GL 92-08 you indicated that the actions necessary to restore (or conflua) the operao111ty of these barriers will be based on the results of the NUMARC program. The staff expects that licensees referencing this program, will review the testing results and, within 30 days after the completion of this test program, inform the NRC of the actions necessary and the schedule for restoring the operability of l these fire barriers.

Response

Once NUMARC provides a report of the tested configurations, we will review the test information. Within 30 days of receipt of this report, we will inform the NRC of the actions necessary and the schedule for restoring the operability of the fire barriers bounded by the NUMARC testing.

l Recuest No. 2 For those plant specific or unique configurations that are not bound by the NUMARC program, please provide within 30 days from the receipt of this letter, your schedules for site specific fire endurance testing of these unique configurations that are not bound by the NUMARC program.

2800.'.'2 9306290274 DR 930624 Fr  %

p ADocg 050aoggy y Q PDR b 6

\\

- .~. . . . -

l 2

Northem States Power Company i Resoonse Once NUMARC provides a report of the tested configurations, we will review the test information. Within 30 days of receipt of this report, we will inform the NRC of the schedule for corrective actions and/or additional site specific testing for those unique configurations which are not bounded by the NUMARC testing.

Reauest No. 3 (a) The staff requests a copy of relevant portions of the subject Stone and Webster Engineering Company Study, " Fire Protection per Appendix R Requirements Ampacity Study" which provides the ampacity derating analysis of the fire barrier installed at Prairie Island, j (b) Also, you should identify the Thermo Science Incorporated test report (s) used as a technical basis for ampacity derating utilized for cables enclosed by Thermo-Lag material.

Response

I l (a) Attached are the Stone and Webster Engineering Corporation Study of l

September 16, 1993 and updated tabulations contained in Prairie Island Ampacity Study Tabulations of February 28, 1987.

l l (b) Thermo Science Incorporated provided ampacity ratings which we did not use. Stone and Webster Engineering Corporation calculations used the thermal conductivity properties of the Therm Lag material, as provided by Thermo Science Incorporated, to generate the ampacity deratings. We l do not have the Thermo Science Incorporated test reports from which the thermal conductivity properties were obtained.

This letter contains the following new NRC commitments:

Once NUMARC provides a report of the tested configurations, we will l review the test information. Within 30 days of receipt of this report, we will inform the NRC of the actions necessary and the schedule for l restoring the operability of the fire barriers bounded by the NUMARC ,

testing.

l

Once NUMARC provides a report of the tested configurations, we will l review the test information. Within 30 days of receipt of this report, l we will inform the NRC of the schedule for corrective actions and/or.

additional site specific testing for those unique configurations which are not bounded by the NUMARC testing.

e Northem States Power Company i l

i Please contact Jack Leveille (612-388-1121, Ext. 4662) if you require further 1 information.

4 l

i pu---

j7pg Roge O Anderson Director Licensing and Management. Issues l

cc: Regional Administrator - III, NRC NRR Project Manager, NRC Sr Resident. Inspector,- NRC State of Minnesota Attn: Kris Sanda J Silberg i

Attachments: 1) Affidavit to the US Nuclear Regulatory Commission

! 2). Stone and Webster Engineering Corporation report: Fire 1 Protection per Appendix R Requirements Ampacity Study 1

3) Prairie Island Ampacity Study Tabulations '

1 i

I l

l I

i

.- . -.. - - _ - . .- . =

I l

l ATTACHMENT 1 UNITED STATES NUCLEAR REGULATORY COMMISSION l NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PIANT DOCKET NOS. 50-282 50-306 THERMO-IAG 330-1 FIRE BARRIERS l I

l Northern States Power Company, a Minnesota corporation, with this letter is submitting information requested by Generic Letter 92-08, Thermo-Lag 330-1 L Fire Barriers, pursuant to 10 CFR 50.54(f).

This letter contains no restricted or other defense information.

NORTHERN STATES P0 COMPANY

/

(

By-Leon'Eliason President NSP Generation Onthisa7Y y of /fi O before me a notary public in and for said County, persMnally appeared Leon Eliason, President NSP Generation, and being first duly sworn acknowledged that he is authorized to execute this i document on behalf of Northern States Power Company, that he knows the l contents thereof, and that to the best of his knowledge, information -and ]

l belief the statements made in it are true and that it is not interposed for j delay. j l I r

- - x, l MARDA K. LaCORE l < NOTARY PUBLIC-MlNNESOTA l l HENNEP!N COUNTY h Wy r=me== Egises Sept 24.1933 wwwwwwwwwwwwwwwmewwwm i

l l

l i

l