ML062180075

Watts Bar, Unit 1 - RAI Re Steam Generator Tube Integrity (TSTF-449)

ML062180075
Person / Time
Site:	Watts Bar
Issue date:	08/10/2006
From:	Pickett D V NRC/NRR/ADRO/DORL/LPLII-2
To:	Singer K W Tennessee Valley Authority
Pickett D V, NRR/DORL, 415-1364
References
TAC MC9271
Download: ML062180075 (4)

Text

August 10, 2006Mr. Karl W. SingerChief 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 ADDITIONALINFORMATION 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), submitteda request to revise the Watts Bar Nuclear Plant (WBN) Unit 1 technical specification (TS) requirements consistent with Technical Specification Task Force (TSTF) Standard TechnicalSpecification Change Traveler, TSTF-449, "Steam Generator Tube Integrity," Revision 4. Inaddition, by letter dated June 12, 2006, the licensee responded to the Nuclear RegulatoryCommission's Request for Additional Information (RAI) on this subject.The staff has reviewed the information contained in your letter dated June 12, 2006, anddetermined 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 theenclosed 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 ManagerPlant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-390

Enclosure:

Request for Additional Informationcc w/enclosure: See next page

ML062180075 NRR-088OFFICELPL2-2/PMLPL2-2/LACSGB/BCLPL2-2/BCNAMEDPickettRSola PKlein for AHiserLRaghavanDATE08/ 08 /0608/ 08/0608/ 08/0608/10 /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 PresidentNuclear Engineering & Technical Services Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801Mr. Robert J. Beecken, Vice PresidentNuclear Support Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Michael D. SkaggsSite Vice President Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381General CounselTennessee Valley Authority ET 11A 400 West Summit Hill DriveKnoxville, TN 37902Mr. John C. Fornicola, ManagerNuclear Assurance and Licensing Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801Mr. Glenn W. Morris, Manager Corporate Nuclear Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801Mr. Paul L. Pace, ManagerLicensing and Industry Affairs Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381Mr. Jay Laughlin, Plant ManagerWatts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381Senior Resident InspectorWatts Bar Nuclear Plant U.S. Nuclear Regulatory Commission 1260 Nuclear Plant Road Spring City, TN 37381County Executive 375 Church Street Suite 215 Dayton, TN 37321County Mayor P. O. Box 156 Decatur, TN 37322Mr. Lawrence E. Nanney, DirectorDivision of Radiological Health Dept. of Environment & Conservation Third Floor, L and C Annex 401 Church Street Nashville, TN 37243-1532Ms. Ann P. Harris341 Swing Loop Road Rockwood, Tennessee 37854 REQUEST FOR ADDITIONAL INFORMATIONWATTS BAR NUCLEAR PLANT UNIT 1APPLICATION FOR TECHNICAL SPECIFICATION IMPROVEMENTREGARDING STEAM GENERATOR TUBE INTEGRITY (TSTF-449)DOCKET NO. 50-390TAC NO. MC9271Tennessee Valley Authority's letter dated June 12, 2006, responded to the staff's Request forAdditional Information concerning proposed changes to the Watts Bar Technical Specifications related to steam generator tube integrity. In the response to Question 2, the licensee indicatedthat the second sentence in the accident induced leakage performance criteria was consistentwith 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, thesecond 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 willnot 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 beconsistent 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