ML20154N226
| ML20154N226 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/25/1988 |
| From: | Ebneter S NRC OFFICE OF SPECIAL PROJECTS |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| References | |
| TAC-R00332, TAC-R00333, TAC-R332, TAC-R333, NUDOCS 8806020235 | |
| Download: ML20154N226 (3) | |
Text
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"4 UNITED STATES
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NUCLEAR REGULATORY COMMISSION 3
WASHINGTON, D. C. 20555 e
\\..... *#g May 25, 1988 Docket hos. 50-327/328 Mr. S. A. White Manager of Nuclear Power Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
Dear Mr. White:
SUBJECT:
QUALIFICATION TESTING 0F INSTALLED SILICONE RUBBER INSULATED IN CONTAINMENT (TAC NOS. R00332, R00333)
This is in response to your letters dated February 29 and March 14, 1988 regarding qualification of the silicone rubber insulated cables at Sequoyah for the full 40 year life of the plant.
In a letter dated December 28, 1987, TVA documented its basis for concluding that the silicone rubber insulated cables installed in the containments at Sequoyah Units 1 and 2 are adequate to perfonn their intended function for a 10 year period following original installation. TVA also informed the staff that all AIW cables in Unit 2 containment in safety-related harsh environment applications, and the Anaconda and Rockbestos cables mixed in the same conduits with AIW cable, have been replaced.
The staff reviewed the TVA data and concluded that the Wyle Laboratory qualification tests of the Anaconda and Rockbestos cables and the replacemer.t of the AIW cable inside the Unit 2 containment provides adequate assurance of the integrity of cable ir.stallation at Sequoyah Unit 2 to allow the restart of that Unit. However, you comitted to qualify the remaining installed silicone rubber insulated cables in contain-ment for the expected life of Sequoyah before Unit 2 returns to service from l
the Unit 2 Cycle 3 refueling outage. This schedule is acceptable to the staff but the staff would like to clarify the details of the tests.
Your letters did not provide details regarding methods of sample selection and testing of the silicone rubber insulated cable.
The following are the NRC staff's views on the content of an acceptable program to demonstrate the full qualified life of silicone rubber insulated cables for use in containment at Sequoyah Units 1 and 2.
The full life test should be based on cable similar to that which is now actually installed in the containments at Sequoyah. The cable samples to be tested should be removed from the containments at either Sequoyah or Watts Bar since the cable installation practices at both sites were determined to have been the same. The cable samples should be selected from worst case conduit configurations and a minimum of five separate cables from each manufacturer should be tested (five AIW, five Rockbestos and five Anaconda).
l 8806020235 800525 PDR ADUCK 05000327 P
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I Lir. S. A. White May 25, 1988 4
The five cables of each manufacturer should be drawn from five separate conduits.
If a conduit contains cables from more than one manufacturer, one cable from each manufacturer may be drawn from a single conduit.
Of course, if TVA decides to remove all the AIW cables from the Unit 1 containment, no testing of AIW cables would be required.
The cable tests should be conducted in a manner similar to those previously conducted at Wyle Laboratories, but cable samples should be tested in their removed condition without artifically thinning of insulation wall thickness.
Within 30 days of the date of this letter, please confirm your commitment to conduct the necessary tests in accordance with the above views or provide an alternative approach and a justification for such an approach.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely, Original Signed by Stewart D. Ebneter, Director Office of Special Projects cc: See next page Distribution
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May 25, 1988
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Mr. S. A. White Tennessee Valley Authority Sequoyah Nuclear Plant cc:
General Counsel Regional Administrator, Region II Tennessee Valley Authority U.S. Nuclear Regulatory Comission l
400 West Sumit Hill Drive 101 Marietta Street, N.W.
E11 B33 Atlanta, Georgia 30323 Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NP Mr. R. L. Gridley c/o U.S. Nuclear Regulatory Comission Tennessee Valley Authority 2600 Igou Ferry Road SN 1578 Lookout Place Soddy Daisy, Tennessee 37379 Chattanooga, Tennessee 37402-2801 Mr. Richard King Mr. H. L. Abercrombie c/o U.S. GA0 Tennessee Valley Authority 1111 North Shore Drive Sequoyah Nuclear Plant Suite 225, Box 194 P.O. Box 2000 Knoxville, Tennessee 37919 Soddy Daisy, Tennessee 37379 Tennessee Department of Health Mr. M. R. Harding and Environment Tennessee Valley Authority ATTN:
Director, Bureau of Environment Sequoyah Nuclear Plant T.E.R.R.A. Building, 1st Floor
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P.O. Box 2000 150 9th Avenue North Soddy Daisy, Tennessee 37379 Nashville, Tennessee 37219-5404 Mr. D. L. Williams Mr. Michael H. Mobley, Director Tennessee Valley Authority Division of Radiological Health 400 West Sumit Hill Drive T.E.R.R.A. Building, 6th Floor 150 9th Avenue North W10 885 Knoxville, Tennessee 37902 Nashville, Tennessee 37219-5404 l
County Judge Dr. Henry Myers, Science Advisor Hamilton County Courthouse Comittee on Interior Chattanooga, Tennessee 37402 and Insular Affairs U.S. House of Representatives Washington, D.C.
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