ML20247D339
| ML20247D339 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/21/1989 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8907250169 | |
| Download: ML20247D339 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 5N 1578 Lookout Place WUL 211989 1
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-259 Tennessee Valley Authority
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50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) - RESOLUTION OF EMPLOYEE CONCERN (EC) 21800 DISCREPANCY - LOW TEMPERATURE THERMAL ANALYSIS This letter serves to resolve the discrepancy between the corrective action for the Watts Bar Nuclear (WBN) Plant Employee Concern EC 21800 and the BFN design criteria requirements.
Originally identified during the February 17, 1989 meeting between the NRC and TVA regarding seismic issues at BFN, this discrepancy involves the corrective action for WBN EC 21800 and the analysis requirements of BFN design criterla 3FN-50-C-7103.
The EC corrective action disallowed exempting low temperature piping from thermal analysis for:
- a. All rigorously analyzed seismic class I piping less than or equal to 2" in diameter with thermal operating modes outside the range of 20' F to 120' F.
- b. All rigorously analyzed seismic class I piping less than or equal to 2" in diameter which may experience thermal or seismic anchor point movements.
- c. All rigorously analyzed seismic class I piping greater than 2" in diameter.
Design criteria BFN-50-C-7103 however, conditionally allowed the exclusion of all low temperature piping from a detailed thermal analysis.
To resolve this, Revision 3 of Design Criteria BFN-50-C-7103, issued March 1,1989, deleted the thermal analysis exemption for low temperature piping in accordance with the guidelines stipulated above. Accordingly, there is no longer a discrepancy between the EC corrective action and the design criteria requirements at BFN.
8907250i49 89072.1 PDR ADOCK 05000257 P
/j An Equal Opportunity Employer
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-If any questions exist' relative to this transmittal, please contact.
Patrick P. Carier at 205 729-3570.
Very truly yours, TENNESSEE-VALLEY AUTHORITY
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Manaer~,Nucl{earLicensing and Regulatory Affairs i
cc: Ms. S. C. Black, Assistant Director
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for Projects TVA Projects Division U.S. Nuclear Regulatory Commisston One. White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Nr. B. A. Wilson, Assistant Director for Inspection Proyams TVA Projects Division U.S. Nuclear Regulatory Commission j
Region II 101 Marietta Street, NH, Suite 2900
-Atlanta, sorgia 30323 NRC Resident 1.1spector Browns Ferry Nuclear. Plant Route 12, Box 637 Athens, Alabama 35609-2000 i
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