ML20044F223

Discusses Licensee Response to GL 92-08, Thermo-Lag 330-1 Fire Barriers, & States Licensee Did Not Provide Schedule by Which Corrective Actions Would Be Completed

ML20044F223
Person / Time
Site:	Prairie Island
Issue date:	05/18/1993
From:	Gamberoni M Office of Nuclear Reactor Regulation
To:	Richard Anderson NORTHERN STATES POWER CO.
References
GL-92-08, GL-92-8, TAC-M85592, TAC-M85593, NUDOCS 9305270223
Download: ML20044F223 (3)

Text

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N y 18, 1993 Docket Nos. 50-282 and 50-306 Mr. Roger 0. Anderson, Director Licensing and Management Issues Northern States Power Company 414 Nicollet Hall Minneapolis, Minnesota 55401

SUBJECT:

PRAIRIE ISLAND - RESPONSE TO GENERIC LETTER 92-08, "THERMO-LAG 330-1 FIRE BARRIERS," (TAC NOS. M85592 AND M85593)

By letter dated April 16, 1993, you provided a response to Generic Letter (GL) 92-08 for Prairie Island. Your response states that the Thermo-Lag fire barriers installed at Prairie Island were qualified by the vendor based on the vendor's understanding of the NRC guidance in existence at the time of installation and that the fire barrier configurations installed at the plant are consistent with the qualification test assembly configurations.

Your response also states that deviations from the tested configuration have been evaluated.

Although Thermo-Lag barriers were evaluated and may have been considered qualified, the results of recent tests and inspections indicate that further actions are now necessary to address fire endurance and ampacity derating of Thermo-Lag barriers.

Your response states that appropriate actions to resolve fire barrier concerns are being developed through an industry program coordinated by NUMARC and you would apply the results of the industry program, when completed, to the Thermo-Lag 330-1 installations at Prairie Island.

Compensatory measures for these inoperable or degraded fire barriers are in place and will remain until these barriers can be declared operable.

Your response to GL 92-08, however, did not provide a schedule by which corrective actions would be completed.

In your response to GL 92-08 you indicated that the actions necessary to restore (or confirm) the operability 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 these fire barriers.

For those plant specific or unique configurations that are not bound by the NUMARC 1

program, please provide within 30 days from the receipt of this letter, your schedules for site specific fire endurance testing of these unique configurations and the implementation of any potential barrier upgrades j

resulting from this testing.

In accordance with the reporting requirements of GL 92-08, you are also requested to confirm in writing, completion of the corrective action.

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i Mr, Roger 0. Anderson Fby 18,1993 l

The staff requests a copy of relevant portions of the subject Stone and Webster Engineering Company Study, " Fire Protection per Appendix R l

Requirements Ampacity Study" which provides the ampacity derating analysis of j

the fire barrier installed at Prairie Island. 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.

The information requested by this letter is within the scope of the overall burden estimate in GL 92-08, which was an average of 300 person-hours for each addressee's response.

This request is covered by Office of Management and Budget Clearance Number 3150-0011, which expires June 30, 1994.

l Sincerely, Origim1 signed by Marsha Gamberoni, Project Manager Project Directorate III-1 Division of Reactor Projects -III/IV/V Office of Nuclear Reactor Regulation cc:

See next page i

DISTRIBUTION:

Docket File NRC & Local PDRs PDIII-l Reading File JRoe JZwolinksi LMarsh MShuttleworth MGamberoni OGC ACRS (10)

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Mr. Roger 0. Arderson, Director Prairie Island Nuclear Generating d

Northern States Power Company Plant t

cc:

J. E. Silberg, Esquire Shaw, Pittman, Potts and Trowbridge i

2300 N Street, N. W.

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Washington DC 20037 Mr. E. L. Matzl, Site General Manager Prairie Island Nuclear Generating Plant Northern States Power Company i

Route 2 i

Welch, Minnesota 55089 l

Lisa R. Tiegel Assistant Attorney General l

Environmental Protection Division Suite 200 520 Lafayette Road St. Paul, Minnesota 55155 i

U.S. Nuclear Regulatory Commission Resident Inspector Office 1719 Wakonade Drive East Welch, Minnesota 55089 Regional Administrator, Region III i

U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Jeff Cole, Auditor / Treasurer Goodhue County Courthouse Red Wing, Minnesota 55066 Kris Sanda, Commissioner Director of Public Service j

121 Seventh Place East Suite 200 l

St. Paul, Minnesota 55101-2145 I

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