ML063540404
| ML063540404 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 12/29/2006 |
| From: | Pickett D NRC/NRR/ADRO/DORL/LPLII-2 |
| To: | Singer K Tennessee Valley Authority |
| Pickett D, NRR/DORL, 415-1364 | |
| References | |
| TAC MD1460 | |
| Download: ML063540404 (11) | |
Text
December 29, 2006 Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
SUBJECT:
WATTS BAR NUCLEAR PLANT, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE (TAC NO. MD1460)
Dear Mr. Singer:
By letter dated May 8, 2006 (TS-06-09), the Tennessee Valley Authority (TVA, the licensee) submitted a proposed license amendment (WBN-TS-06-09) that would revise Technical Specification 3.7.9.1, Ultimate Heat Sink Temperature, to increase the maximum essential raw cooling water temperature limit from 85 degrees Fahrenheit (EF) to 88 EF.
In order for the staff to complete its review of the information provided by the licensee, we request that TVA provide responses to the enclosed request for additional information (RAI).
Based on discussions with your staff, we understand that you plan to respond to the enclosed RAI by February 16, 2007.
Sincerely,
/RA/
Douglas V. Pickett, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-390
Enclosure:
Request for Additional Information cc: See next page
ML063540404 NRR-088 OFFICE LPL2-2/PM LPL2-2/LA AFPB/BC LPL2-2/BC (A)
NAME DPickett RSola SWeerakkody as signed on DPickett DATE 12/29/06 12/29/06 12/14/06 12/29/06
REQUEST FOR ADDITIONAL INFORMATION WATTS BAR NUCLEAR PLANT, UNIT 1 TECHNICAL SPECIFICATION CHANGE REQUEST FOR ULTIMATE HEAT SINK TEMPERATURE DOCKET NO. 50-390 The ultimate heat sink (UHS) is the water source for the essential raw cooling water system, which will provide cooling water to various components/systems, including components required for achieving and maintaining post-fire safe shutdown. Although the expected water temperature increase from 85 oF to 88 oF has no direct physical impact on any safe-shutdown components/systems, the rise in cooling water temperature may adversely impact the performance characteristics of these components/systems.
To evaluate the impact of the proposed license amendment, if any, on the fire protection program at Watts Bar Nuclear Plant, Unit 1, the staff requests that the following additional information be provided:
1.
Section 3.7, Fire Protection, of the May 8, 2006, license amendment application only discusses the effect of the proposed UHS maximum temperature increase on the high-pressure fire suppression system. Any impact on safe-shutdown components/systems and their ability to achieve and maintain post-fire safe shutdown, which is part of the Fire Protection Program, should also be discussed in this section.
2.
Note 9 to Table 2 of the above license amendment application indicated that emergency diesel generator load shedding is performed to reduce the electrical loading to 100 percent. Will this load shedding be accomplished as part of a permanent design change or as post-fire manual actions?
Mr. Karl W. Singer Tennessee Valley Authority WATTS BAR NUCLEAR PLANT cc:
Mr. Ashok S. Bhatnagar, Senior Vice President Nuclear Operations Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Preston D. Swafford, Senior Vice President Nuclear Support Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Larry S. Bryant, Vice President Nuclear Engineering & Technical Services Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Michael D. Skaggs, Site Vice President Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 General Counsel Tennessee Valley Authority 6A West Tower 400 West Summit Hill Drive Knoxville, TN 37902 Mr. John C. Fornicola, Manager Nuclear Assurance Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Robert H. Bryan, Jr., General Manager Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Ms. Beth A. Wetzel, Manager Corporate Nuclear Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. James D. Smith, Acting Manager Licensing and Industry Affairs Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 Mr. Jay Laughlin, Plant Manager Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 Senior Resident Inspector Watts Bar Nuclear Plant U.S. Nuclear Regulatory Commission 1260 Nuclear Plant Road Spring City, TN 37381 County Executive 375 Church Street Suite 215 Dayton, TN 37321 County Mayor P. O. Box 156 Decatur, TN 37322 Mr. Lawrence E. Nanney, Director Division of Radiological Health Dept. of Environment & Conservation Third Floor, L and C Annex 401 Church Street Nashville, TN 37243-1532 Ms. Ann P. Harris 341 Swing Loop Road Rockwood, TN 37854