ML062180075
| ML062180075 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 08/10/2006 |
| From: | Pickett D NRC/NRR/ADRO/DORL/LPLII-2 |
| To: | Singer K Tennessee Valley Authority |
| Pickett D, NRR/DORL, 415-1364 | |
| References | |
| TAC MC9271 | |
| Download: ML062180075 (4) | |
Text
August 10, 2006 Mr. Karl W. Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
SUBJECT:
WATTS BAR NUCLEAR PLANT, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING STEAM GENERATOR TUBE INTEGRITY (TSTF-449) (TAC NOS. MC9271)
Dear Mr. Singer:
By letter dated December 15, 2005, Tennessee Valley Authority (TVA, the licensee), submitted a request to revise the Watts Bar Nuclear Plant (WBN) Unit 1 technical specification (TS) requirements consistent with Technical Specification Task Force (TSTF) Standard Technical Specification Change Traveler, TSTF-449, "Steam Generator Tube Integrity," Revision 4. In addition, by letter dated June 12, 2006, the licensee responded to the Nuclear Regulatory Commissions Request for Additional Information (RAI) on this subject.
The staff has reviewed the information contained in your letter dated June 12, 2006, and determined the need for additional information to complete its review.
In order for the NRC staff to complete its review, we request that TVA provide responses to the enclosed RAI within 30 days of receipt of this letter. If you have any questions about this material, please contact me at (301) 415-1364.
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 w/enclosure: See next page
ML062180075 NRR-088 OFFICE LPL2-2/PM LPL2-2/LA CSGB/BC LPL2-2/BC NAME DPickett RSola PKlein for AHiser LRaghavan DATE 08/ 08 /06 08/ 08/06 08/ 08/06 08/10 /06
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. Larry S. Bryant, Vice President Nuclear Engineering & Technical Services Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Robert J. Beecken, Vice President Nuclear Support 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 ET 11A 400 West Summit Hill Drive Knoxville, TN 37902 Mr. John C. Fornicola, Manager Nuclear Assurance and Licensing Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Glenn W. Morris, Manager Corporate Nuclear Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Paul L. Pace, 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, Tennessee 37854
REQUEST FOR ADDITIONAL INFORMATION WATTS BAR NUCLEAR PLANT UNIT 1 APPLICATION FOR TECHNICAL SPECIFICATION IMPROVEMENT REGARDING STEAM GENERATOR TUBE INTEGRITY (TSTF-449)
DOCKET NO. 50-390 TAC NO. MC9271 Tennessee Valley Authoritys letter dated June 12, 2006, responded to the staffs Request for Additional Information concerning proposed changes to the Watts Bar Technical Specifications related to steam generator tube integrity. In the response to Question 2, the licensee indicated that the second sentence in the accident induced leakage performance criteria was consistent with the Watts Bar design and licensing basis, therefore, the original proposed wording was adequate. Although the wording may be consistent with the design and licensing basis, the second sentence in the accident induced leakage performance criteria in TSTF-449 is not intended to be an interpretation of the current design and licensing basis. Rather, the second sentence (in the accident induced performance criteria in TSTF 449) is intended to ensure that the potential for induced leakage during severe accidents will be maintained at a level that will not increase risk. This is discussed in the staff's generic safety evaluation of TSTF-449.
As a result, the staff requests the licensee to discuss its plans to modify its proposal to be consistent with TSTF-449 or justify why only a limit on the "faulted" steam generator is considered necessary to maintain risk at acceptable levels during the severe accident scenarios discussed in the staff's generic safety evaluation of TSTF-449.
Enclosure