Letter Sequence Request |
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TAC:ME2731, Clarify Application of Setpoint Methodology for LSSS Functions (Withdrawn, Closed) |
Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, ... further results|Request]]
- Acceptance...
- Supplement, Supplement, Supplement
Results
Other: CNL-14-077, Responses to Degraded Voltage Issue Requests for Additional Information, ML101050203, ML102240630, ML102290358, ML102290360, ML102290361, ML102290362, ML102290363, ML102290364, ML102290365, ML102290366, ML102290367, ML102290368, ML102290383, ML102290384, ML102290385, ML102290386, ML102290387, ML102290388, ML102290389, ML102290390, ML102290391, ML102290392, ML102290403, ML102290404, ML102290405, ML102290406, ML102290407, ML102290408, ML102290409, ML102290410, ML102290411, ML102290414, ML102290439, ML102290440, ML102290441, ML102290442, ML102290443, ML102290444, ML102290445, ML102290446, ML102290447, ML102290448, ML102290458, ML102290459, ML102290460, ML102290461, ML102290462, ML102290463, ML102290464... further results
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Notice of Forthcoming Meeting with Tennessee Valley Authority (TVA) to Discuss the Complete Status of TVA Hydrology Issues Including the Flooding Effects on the TVA Operating Nuclear Plants
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Request for Additional Information Regarding Licensees Final Safety Analysis Report Amendment Related to Reactor Systems, Nuclear Performance and Code Review, Ansd Plant Systems
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2010-05-05
[Table View] |
Text
Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 June 28, 2010 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 NRC Docket No. 50-391
Subject:
Watts Bar Nuclear Plant, Unit 2 - Request for Additional Information (RAI) Regarding Licensee's Final Safety Analysis Report Amendment Related to Section 4.2.2," Reactor Vessel Internal Components" (TAC No. ME2731)
References:
- 1. NRC letter to TVA dated March 11, 2010, Watts Bar Nuclear Plant, Unit 2 - Request for Additional Information Regarding Licensee's Final Safety Analysis Report Amendment Related to Section 4.2.2, Reactor Vessel Internal Components (TAC No. ME2731) [ML100550007]
- 2. TVA Letter to NRC dated April 9, 2010, Watts Bar Nuclear Plant (WBN) Unit 2 - Response to U.S. Nuclear Regulatory Commission (NRC) Request for Additional Information Regarding Licensees Final Safety Analysis Report (FSAR) Amendment Related to Section 4.2.2, Reactor Vessel Internal Components (TAC NO. ME2731)
[ML101040573]
Reference 1 provided the subject RAI. In Reference 2, among other correspondence, TVA responded to the RAI with the following commitment, As stated in the above response, the HTH process was not used for the Alloy X-750 bolting material. The impact of this condition is currently being reviewed by Westinghouse. Following receipt of the Westinghouse recommended plan for resolution, TVA will provide the plan to the NRC by June 30, 2010.
u.s. Nuclear Regulatory Commission Page 2 June 28, 2010 Upon review of relevant operating history and test data, Westinghouse recommended that TVA change the current Unit 2 clevis insert bolts to the latest design which uses an X-750 alloy with an HTH heat treatment, rolled threads and larger radius on the undercut of the cap screw head. Westinghouse found that the HTH heat treatment greatly improves resistance to Primary Water Stress Corrosion Cracking in X-750 alloy. With a change in the material heat treatment along with the bolt design modifications to reduce stresses in high stress areas, Westinghouse believes that this design will provide an effective improvement over the clevis insert bolts currently installed in Unit 2.
TVA concurs with this recommendation and will replace the bolts prior to WBN Unit 2 operation. identifies TVA's commitment.
If you have any questions, please contact me at (423) 365-2351.
Sincerely, fij13 Masoud Ba*
ani Watts Bar n* 2 Vice President
Enclosure:
1.
List of Regulatory Commitments cc (Enclosure):
- u. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381
List of Regulatory Commitments
- 1. TVA will change the current Unit 2 clevis insert bolts to the latest design which uses an X-750 alloy with an HTH heat treatment, rolled threads and larger radius on the undercut of the cap screw head. TVA will replace the clevis insert bolts prior to Unit 2 operation.
