ML20045E107
| ML20045E107 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/29/1993 |
| From: | Labarge D Office of Nuclear Reactor Regulation |
| To: | Medford M Tennessee Valley Authority |
| References | |
| GL-92-008, TAC-M85604, TAC-M85605 NUDOCS 9307010114 | |
| Download: ML20045E107 (3) | |
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W ASHINGTON, D.C. 20555-0001 June 29, 1993 Docket Nos. 50-327 and 50-328 Tennessee Valley Authority ATTN: Dr. Mark 0. Medford, Vice President Nuclear Assurance, Licensing & Fuels 3B Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801 l
Dear Dr. Medford:
SUBJECT:
RESPONSE TO GENERIC LETTER 92-08, " THERM 0-LAG 330-1 FIRE BARRIERS," SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 (TAC N05. M85604 AND M85605)
By letter dated April 15, 1993, you provided a response to Generic Letter (GL) 92-08 for the Sequoyah Nuclear Plant, Units 1 and 2.
Your response stated that the Thermo-Lag fire barriers installed at the Sequoyah plant were qualified by Thermal Science Incorporated, based on the vendor's understanding of the NRC guidance in existence at the time of installation.
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.
In your letter, you indicated that, because you could not confirm acceptability of the ampacity derating test configurations relied upon for the ampacity derating factors used for raceways protected by Thermo-Lag, you have implemented in-house testing to independently verify the adequacy of the Thermo-Lag installations in regard to cable ampacity.
In addition, your response indicated that you have not evaluated the deviaticas from the tested fire barrier configurations and installation methods provided by Thermal Science Incorporated.
You further stated 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 installations at Sequoyah.
Compensatory measures for an iaoperable barrier are in place and will remain in place until the fire barriers can be declared operable.
Your response to GL 92-08, however, did not provide a schedule by which corrective actions would be completed.
The staff expects that licensees referencing the NUMARC program as the basis for establishing the acceptability of the Thermo-Lag installation at their facility will review the results and inform the NRC of the necessary aC 19tE CENTEfl C8PY
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- Dr. Mark 0. Medford corrective actions and anticipated completion within 30 days of completion of the NUMARC or other test program, including schedules for corrective action resulting from site-specific fire endurance testing of unique. fire barrier configurations.
In accordance with the reporting requirements of GL 92-08, we request that you also confirm, in writing, completion of the corrective actions.
The information requested by this letter is within the scope of the overall burden estimate in Generic Letter 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.
Sincerely, 7
Original signed by David E. LaBarge, Senior Project Manager Project Directorate 11-4 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc: See next page Distribution Docket File:
NRC & Local PDRs SQN Reading S. Varga G. Lainas F. Hebdon B. Clayton D. LaBarge A. Masciantonio C. McCracken C. Berlinger 0GC ACRS (10)
P.-Frederickson, RII E. Merschoff, RII cc:
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O Tennessee Valley Authority Sequoyah Nuclear Plant ATTN: Dr. Mark 0. Medford cc:
Mr. W. H. Kennoy, Director County Judge Tennessee Valley Authority Hamilton County Courthouse ET 12A Chattanooga, Tennessee 37402 400 West Summit Hill Drive Knoxville, Tennessee 37902 Regional Administrator U.S.N.R.C~. Region II Mr. R. M. Eytchison, Vice President 101 Marietta Street, N.W.
Nuclear Operations Suite 2900 Tennessee Valley Authority Atlanta, Georgia 30323 3B Lookout Place 1101 Market Street i
l Chattanooga, Tennessee 37402-2801 Mr. William E. Holland Senior Resident Inspector Sequoyah Nuclear Plant Mr. M. J. Burzynski, Manager U.S.N.R.C.
Nuclear Licensing and Regulatory Affairs 2600 Igou Ferry Road Tennessee Valley Authority Soddy Daisy, Tennessee 37379 l
SB Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801 Mr. Jack Wilson, Vice President Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, Tennessee 37379 TVA Representative Tennessee Valley Authority 11921 Rockville Pike i
Suite 402 Rockville, Maryland 20852 Ms. Marci Cooper, Site Licensing Manager Sequoyah Nuclear Plant i
Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, Tennessee 37379 Mr. Michael H. Mobley, Director Division of Radiological Health 3rd Floor, L and C Annex 401 Church Street Nashville, Tennessee 37243-1532 General Counsel Tennessee Valley Authority ET 11H 400 West Summit Hill Drive Knoxville, Tennessee -37902 evm e
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