ML071840262
| ML071840262 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 07/09/2007 |
| From: | Moroney B NRC/NRR/ADRO/DORL/LPLII-2 |
| To: | Campbell W Tennessee Valley Authority |
| Moroney B, NRR/DORL, 415-3974 | |
| References | |
| TAC MD4448 | |
| Download: ML071840262 (7) | |
Text
July 9, 2007 Mr. William R. Campbell, Jr.
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 INSERVICE INSPECTION REQUEST FOR RELIEF NO. PDI-2 (TAC NO. MD4448)
Dear Mr. Campbell:
By letter dated February 7, 2007, the Tennessee Valley Authority (TVA, the licensee) submitted Request for Relief (RR) No. PDI-2 is for the second 10-year inservice inspection interval at Watts Bar Unit 1. In RR No. PDI-2, TVA proposed to perform volumetric examinations on reactor pressure vessel nozzle-to-vessel welds at a reduced volume of 1/2 inch beyond the widest part of the boundary of the deposited weld material, in lieu of the requirements of the American Society of Mechanical Engineers Code,Section XI, Figures IWB-2500-7(a) and IWB-2500-7(b).
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 July 27, 2007. If you have any questions about this material, please contact me at (301) 415-3974.
Sincerely, Brendan T. Moroney, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-390
Enclosure:
RAI cc w/encl: See next page
ML071840262 NRR-088 OFFICE LPL2-2/PM LPL2-2/LA CVIB/BC LPL2-2/BC NAME BMoroney RSola MMitchell (by memo)
TBoyce DATE 07 / 09 /07 07 / 05 /07 06/14/07 07 / 09 /07
Enclosure REQUEST FOR ADDITIONAL INFORMATION SECOND 10-YEAR INSERVICE INSPECTION INTERVAL REQUEST FOR RELIEF NO. PDI-2 WATTS BAR NUCLEAR PLANT, UNIT 1 TENNESSEE VALLEY AUTHORITY DOCKET NUMBER 50-390 Request for Relief (RR) No. PDI-2 is for the second 10-year inservice inspection interval, in which Watts Bar Nuclear Plant, Unit 1 adopted the 2001 Edition with addenda through the 2003 Addenda of the American Society of Mechanical Engineers (ASME) Code,Section XI as the ASME Code of record.
In its letter dated February 7, 2007, Tennessee Valley Authority (TVA) proposed to perform volumetric examinations on reactor pressure vessel nozzle-to-vessel welds at a reduced volume of 1/2 inch beyond the widest part of the boundary of the deposited weld material in lieu of the requirements of ASME Code,Section XI, Figures IWB-2500-7(a) and IWB-2500-7(b).
1.
The Justification For Granting Relief states that the examination volume required by
[ASME Code,Section XI, Figures] IWB-2500-7(a) and (b) for the pressure retaining nozzle-to-vessel welds extends far beyond the weld and the heat effected zones into the base metal, and is unnecessarily large.
a.
Provide supplemental sketches showing the specific configuration nozzle-to-vessel weld and revised examination volume (including dimensions).
b.
Provide a listing of components for which relief is being requested.
c.
Identify the ultrasonic technique (manual or automated), nominal pipe diameters, and weldment material (ferritic, austenitic stainless steel, Inconel) that TVA is proposing to inspect.
d.
Since TVA is complying with Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(b)(2)(xv)(K)(1), and 10 CFR 50.55a(b)(2)(xv)(K)(2), will TVA be performing any examinations from the outside surface of the subject nozzles?
e.
Clarify how TVAs personnel will be able to locate the widest portion of the nozzle-to-vessel weld precisely. It is unclear how repaired areas extending beyond the ideal weld cross-sectional area are identified and how these areas will be examined. If personnel are to identify widest sections of the nozzle-to-vessel weld, specify what positive means of examination will be used to identify the weld extremities. Will the extremities be identified on both the inside and outside diameters of the nozzle to ensure complete coverage of the welds?
f.
Have the subject welds been previously ultrasonically examined using the examination volumes of ASME Code,Section XI, Figures IWB-2500-7(a) and (b)?
William R. Campbell, Jr.
Tennessee Valley Authority WATTS BAR NUCLEAR PLANT cc:
Mr. Ashok S. Bhatnagar Senior Vice President Nuclear Generation Development and Construction 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. Walter M. Justice II Interim 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. Michael J. Lorek, 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