ML20046A283
| ML20046A283 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 07/14/1993 |
| From: | Baker E Office of Nuclear Reactor Regulation |
| To: | Graham P GULF STATES UTILITIES CO. |
| References | |
| GL-92-08, GL-92-8, TAC-M85596, NUDOCS 9307270187 | |
| Download: ML20046A283 (3) | |
Text
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July 14, 1993 Docket No. 50-458 Gulf States Utilities ATTN: Mr. Philip D. Graham Vice President (RBNG)
Post Office Box 220 St. Francisville, Louisiana 70775
Dear Mr. Graham:
SUBJECT:
RESPONSE TO GENERIC LETTER 92-08, " THERM 0-LAG 330-1-FIRE BARRIERS" RIVER BEND UNIT 1 (TAC N0. H85596)
By "RBG-38343, Forwards Response to GL 92-08, Thermo-Lag 330-1 Fire Barriers & Suppl 1 to NRC Bulletin 92-001, Failure of Thermo-Lag 330 [[Topic" contains a listed "[" character as part of the property label and has therefore been classified as invalid. Sys to Maintain Cabling in Wide Cable Trays Free from Fire Damage|letter dated April 14, 1993]], Gulf States Utilities (GSU) provided a response to Generic Letter (GL) 92-08 for River Bend Station.
Your response states that the Thermo-Lag fire barriers installed at River Bend were qualified by the vendor based on its understanding of the NRC guidance in existence at the time of installation and that, in general, 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 configurations 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 these barriers. Your response states that appropriate actions to resolve these concerns are being developed through an industry program coordinated by NUMARC and you will apply the results of the industry program, when completed, to the Thermo-Lag 330-1 installed at River Bend. The response also states that even using the more conservative ampacity derating values developed by Underwriters Laboratory, all wrapped cables at River Bend.are adequately sized. Compensatory measures for the inoperable fire barriers are in place and will remain in place until the 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 the NUMARC program will review the results and, within 30 days after completion of the program, inform the NRC of the actions necessary and the schedule for restoring the operability of these fire barriers including any plant-specific or unique fire barrier configurations that are not bounded by the NUMARC program.
In accordance with the reporting requirements of GL 92-08, you are also to confirm, in writing, completion of the corrective actions.
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r Mr. Philip D. Graham July 14, 1993 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 the Office of Management and Budget Clearance Number 3150-0011, which expires June 30, 1994.
Sincerely, Original Signed By 1
Edward T. Baker, Senior Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation cc:
See next page DISTRIBUTION
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Mr. Philip D. Graham July 14, 1993 cc:
Winston & Strawn Ms. H. Anne Plettinger ATTN: Mark J. Wetterhahn, Esq.
3456 Villa Rose Drive 1400 L Street, N.W.
Baton Rouge, Louisiana 70806 Washington, D.C. 20005-3502 Mr. Les England Director - Nuclear Licensing Gulf States Utilities Company St. Francisville, Louisiana 70775 Mr. Philip G. Harris' Cajun Electric Power Coop, Inc.
10719 Airline Highway P. O. Box 15540 l
Baton Rouge, Louisiana 70895 Senior Resident Inspector P. O. Box 1051 St. Francisville, Louisiana 70775 President of West Feliciana Police Jury P. O. Box 1921 St. Francisville, Louisiana 70775 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. J. David McNeill, III William G. Davis, Esq.
Department of Justice Attorney General's Office P. 0.-Box 94095 Baton Rouge, Louisiana 70804-9095 Administrator Louisiana Radiation Protection Division P. O. Box 82135 Baton Rouge, Louisiana 70884-2135 4.