ML20212J396
| ML20212J396 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/15/1987 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8701280190 | |
| Download: ML20212J396 (3) | |
Text
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Decket hos.: 50-327 and 50-328 Mr. S. A. White Manager of Nuclear Power Tennessee Valley Authority 6N 3PA lockout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
Subject:
PE00EST FOR ADDITIONAL INFORf'ATION RELATED TO INSTRUMENT SENSING LINE SLOPE DEFICIENCIES FOR SFOUOYAH, Uf;ITS 1 AND 2 The staff is currently conducting a review of Tennessee Valley Authority (TVA) employee concerns relating to instrument sensino line slepe deficiencies.
Several trpleyee concerns have surfaced which allege that installed instrLrcrt sensing lincs do not comply with minimum slope requirements and are susceptible to air / gas entrapment which can adversely affect instrument accuracy and reliability. TVA has perfonned several studies which are purported to discount slope deficiencies as a problem during nomal plent operation.
TVA generally relics cn historical operating experience as support for this position. The staff, in order to perfom its own review, necessarily needs access to infonnaticn related to this issue. To this end, we request the following:
1)
Minimum slope requirement (s) for sensing lines and how this requiren:ent is detenained.
If slope requirements vary by system, identify individual system, related slope requirements, and method of detemining requirement.
2)
For systems with sensing lines which deviate from slere requirement, quantify and state the reason for the deviation.
3)
Section IV A of Element repcrt noo.ber C017301 states that Sequoyah's reliance on "...several years of successful operating experience..." is an adequate basis for acceptirg existing line slope deficiencies.
Provide your rationale for relying en historical experience as just-ification for accepting slope deficiencies. What formal (or informal) guidance exists which supports your reliance on historical experience?
4)
Copy of letter from Wohld to MER files, dated November 17,1976,(RIMS l'EB78 1120352), titled " Instrument Sensing Line Problems - Report of Octcber 17, 1978, - Field Trip Findings."
5)
Copy of letter from Vineyard to Rankin dated December 20, 1985 (RIt'S 553 8604 17988) titled " Sense Line Slope Employee Concern."
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6)
Infonnation regarding sense line backfilling methodology and applicability.
7)
Available reports from Norris Labs regarding flow rates for SON backfilling procedure for sensing lines.
We request TVA provide this information within 30 days of receipt of this letter to expedite closure of the staff review of this item.
If you have any questions concerning this matter, please contact John Thcirpson at (301) 492-7396.
Sincerely, B. J. Youngblood, Director PWR Project Directorate #4 Division of PWR Licensing-A cc: See next page DISTRIBUTION:
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Tennessee Department of Public Health Regional Administrator, Region II ATTN: Director, Bureau cf U.S. Nuclear Regulatory Commission, Environmental Health Services 101 Marietta Street, N.W., Suite 2900 Cordell Hull Building Atlanta, Georgia 30323 Nashville, Tennessee 37219 J.A. Kirkebo ATTN:
D.L. Willi 6ms Tennessee Valley Authority Mr. Michael H. Mobley, Director 400 West Sumit Hill Drive, W12 A12 Division of Radiological Health Knoxville, Tennessee 37902 T.E.R.R.A. Euilaing 150 9th Avenue North Mr. Bob Faas Nashville, Tennessee 37203 Westinghouse Electric Corp.
P.O. Eox 355 County Judge Hamilton County Courthousc Pittsburgh, Pennsylvania 15230 Chattanooga, Tennessee 37402 R. L. Oridley Tennessee Valley Authority SN 1578 Lookout Place Chattanooga, Tennessee 37402-2801
- 11. R. Harding Tennessee Valley Authority Sequoyah Nuclear Plant P.O. Box 2000 Soddy Daisy, Tennessee 37379 Resident Inspecter/Sequoyah fiPS c/o U.S. Nuclear Regulatory Comission 2600 Ipou Ferry Road Soddy Daisy, Tennessee 37379 H.L. Abercrombie Tennessee Valley Authority Sequoyah Nuclear Plant F.O. Box 2000 Soddy Daisy, Tennessee 37379
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