Letter Sequence Draft RAI |
|---|
TAC:MD6311, Clarify Application of Setpoint Methodology for LSSS Functions, Control Room Habitability, Steam Generator Tube Integrity (Approved, Closed) TAC:MD8314, Elimination of Requirements for a Post Accident Sampling System (Withdrawn, Closed) |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
Results
Other: CNL-14-154, Status of Regulatory Framework for the Completion of Construction and Licensing for Unit 2 - Revision 12 (TAC No. MD6311), and Status of Generic Communications for Unit 2 - Revision 12, CNL-15-137, Status of Regulatory Framework for the Completion of Construction and Licensing for Unit 2 - Revision 13 (TAC No. MD6311) and Status of Generic Communications for Unit 2 - Revision 13, ML080860026, ML080860040, ML081700293, ML082410088, ML083460177, ML090480486, ML101200204, ML101260469, ML101600477, ML101680561, ML102170077, ML103010299, ML11213A130, ML11362A056, ML12234A688, ML13023A315, ML13213A194
|
MONTHYEARML0728203072007-10-11011 October 2007
Electronic Distribtion Initiative Letter, Licensee List, Electronic Distribution Input Information, Division Plant Mailing Lists
Project stage: Request
ML0732401242007-11-26026 November 2007
Summary of Meeting with Tennessee Valley Authority on Use of Eagle 21 at Watts Bar Unit 2
Project stage: Meeting
ML0733900862007-12-0404 December 2007
Risk Informed Inservice Inspection Program
Project stage: Request
ML0734400222007-12-0505 December 2007
Westinghouse Eagle - 21 Process Protection System
Project stage: Request
ML0801705432008-01-0303 January 2008
Summary of December 12, 2007, Meeting with Tennessee Valley Authority on Reconstruction of the Licensing Basis for Watts Bar Unit 2
Project stage: Meeting
ML0735209712008-01-0303 January 2008
Summary of Meeting with Tennessee Valley Authority on Reconstitution of the Licensing Basis for Watts Bar, Unit 2
Project stage: Meeting
ML0803204432008-01-29029 January 2008
Regulatory Framework for the Completion of Construction and Licensing Activities
Project stage: Request
ML0803701852008-02-0101 February 2008
Request to Use American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, Code Case N-520-2, Alternative Rules for Renewal of Active or Expired N-Type Certificates for Plants Not in Active Construction
Project stage: Other
ML0733300822008-02-15015 February 2008
IMC 2517, Watts Bar Unit 2 Construction Inspection Program
Project stage: Request
ML0807702372008-03-13013 March 2008
Regulatory Framework for the Completion of Construction and Licensing Activities for Unit 2 - Restructured Tables
Project stage: Request
ML0812105062008-05-0707 May 2008
Request for Additional Information Regarding Eagle-21 Process Protection System (Tac No. MD6311)
Project stage: RAI
ML0808600262008-05-0808 May 2008
Assessment of Remaining Operating License Application Review Scope
Project stage: Other
ML0808600402008-05-0808 May 2008
Enclosure 1- Watts Bar Nuclear Plant, Unit 2 - Assessment of Remaining Operating License Application Review Scope
Project stage: Other
ML0810101162008-05-0808 May 2008
Review Topics for Safety Evaluation, Attachment 1
Project stage: Approval
ML0814300282008-05-14014 May 2008
Transmittal of Annual Radiological Environmental Operating Report of 2007
Project stage: Request
ML0813008092008-05-22022 May 2008
Request for Additional Information, Renewal of Active or Expired N-Type Certificates for Plants
Project stage: RAI
ML0814901102008-05-28028 May 2008
Status of Generic Communications for Review (Tac No. MD8314)
Project stage: Other
ML0814901182008-05-28028 May 2008
NRC Review: Generic Communications Status for TVA Watts Bar Unit 2
Project stage: Other
ML0817002932008-06-16016 June 2008
Response to Additional Information Request on Regulatory Framework for the Completion of Construction and Licensing, Revision 1
Project stage: Other
ML0818504602008-07-0202 July 2008
Final Supplemental Environmental Impact Statement - Request for Additional Information
Project stage: Supplement
ML0818504592008-07-0202 July 2008
Response to Request for Additional Information
Project stage: Response to RAI
ML0821402382008-07-29029 July 2008
Generic Communications Status, Revision 1
Project stage: Other
ML0824100882008-08-25025 August 2008
Westinghouse Eagle-21 Process Protection System
Project stage: Other
ML0827500192008-09-26026 September 2008
Regulatory Framework for the Completion of Construction and Licensing Activities for Unit 2 - Corrective Action and Special Programs, and Unresolved Safety Issues
Project stage: Other
ML0825603732008-10-0202 October 2008
Request for Relief Regarding Alternative Rules for Renewal of Active or Expired N-Type Certificates
Project stage: Other
ML0834601772008-12-0909 December 2008
Unit 2 - Licensing Basis Preservation and Construction Refurbishment Program for Structures, Systems and Components (Sscs)
Project stage: Other
ML0904804362009-02-23023 February 2009
Summary of December 11, 2008, Meeting with Tennessee Valley Authority on Status of Construction and Licensing Activities
Project stage: Meeting
ML0904804662009-02-23023 February 2009
NRR - Public Meeting WBN2 Status 12-11-08
Project stage: Meeting
ML0904804712009-02-23023 February 2009
Region II - December 2008 Public Meeting with Notes
Project stage: Meeting
ML0904804862009-02-23023 February 2009
TVA December 11, 2008 - Public MtgR1
Project stage: Other
ML1012002042010-04-20020 April 2010
Preservice Inspection Program Plan and Additional Information
Project stage: Other
ML1012604692010-04-29029 April 2010
Status of Regulatory Framework for the Completion of Construction and Licensing for Unit 2 - Revision 2, and Status of Generic Communications for Unit 2 - Revision 2
Project stage: Other
ML1016004772010-06-0303 June 2010
Final Safety Analysis Report (FSAR) - Response to Preliminary Requests for Additional Information
Project stage: Other
ML1015903722010-06-0303 June 2010
Information Regarding Buried Piping/Cable
Project stage: Request
ML1016805612010-06-17017 June 2010
Preservice Inspection Program Plan and Additional Information
Project stage: Other
ML1017602222010-06-25025 June 2010
Request to Use ASME Boiler and Pressure Vessel Code, Code Case N-520-3, Alternative Rules for Renewal of Active or Expired N-Type Certificates for Plants Not in Active Construction, Section III, Division 1
Project stage: Other
ML1020404822010-06-30030 June 2010
WNA-DS-01667-WBT-NP, Rev. 1, Rras Watts Bar 2 NSSS Completion Program I&C Projects, Post Accident Monitoring System - Design Specification
Project stage: Request
ML1020404842010-06-30030 June 2010
Enclosure 5, WNA-DS-01617-WBT-NP, Rev. 1, Rras Watts Bar 2 NSSS Completion Program I&C Projects, Post Accident Monitoring System - System Requirements Specification
Project stage: Request
ML1021700772010-07-30030 July 2010
Status of Regulatory Framework for the Completion of Construction and Licensing for Unit 2 - Revision 3, and Status of Generic Communications for Unit 2 - Revision 3
Project stage: Other
ML1022403822010-08-11011 August 2010
NRC August 3-4, 2010 Instrumentation and Controls Meeting - Request for Additional Information
Project stage: Meeting
ML1022900752010-08-16016 August 2010
Unit 2 - Change to Developmental TS Section 4.2.2, Control Rod Assemblies
Project stage: Request
ML1022801282010-08-16016 August 2010
OL - FW: 7-30-10_GL 95-07 RAI Response to NRC
Project stage: Request
ML1027005272010-09-29029 September 2010
Request for Relief Regarding Alternative Rules for Renewal of Active or Expired N-Type Certification
Project stage: Other
ML1027404372010-10-12012 October 2010
Notice of Forthcoming Meeting with Tennessee Valley Authority (TVA) to Discuss Responses to the NRC Requests for Additional Information (Rais) for General Letter 2004-02
Project stage: RAI
ML1030102992010-10-28028 October 2010
– Status of Regulatory Framework for the Completion of Construction and Licensing for Unit 2 - Revision 4, and Status of Generic Communications for Unit 2 - Revision 4
Project stage: Other
ML1032100192010-10-31031 October 2010
Nuclear Automation Watts Bar 2 NSSS Completion Program I&C Projects, Failure Modes and Effects Analysis (FMEA) for the Post Accident Monitoring System (Nonproprietary), WNA-AR-001 80-WBT-NP, Revision 0, Dated October 2010. Attachment 2
Project stage: Request
ML1031403142010-11-0101 November 2010
OL - TVA Letter to NRC_10-29-10_WBN U2 FSAR 101
Project stage: Request
ML1032001462010-11-0909 November 2010
Final Safety Analysis Report (FSAR) - Response to Requests for Additional Information
Project stage: Response to RAI
ML1032106442010-11-17017 November 2010
Revision of Commitment for Implementation of the Maintenance Rule
Project stage: Request
ML1106910592010-12-16016 December 2010
Request for Comments
Project stage: Request
2008-08-25
[Table View] |
Text
1 WBN2Public Resource From:
Poole, Justin Sent:
Friday, March 04, 2011 11:07 AM To:
Crouch, William D Cc:
WBN2HearingFile Resource
Subject:
Draft Request for Additional Information re: FSAR Section 10.2.3 Attachments:
RAI for WBN-2 Turbine Rotor Integrity.docx
- Bill, Attached, for your review, are preliminary Request for Additional Information (RAI) questions regarding Watts Bar Nuclear Plant (WBN), Unit 2. Please review to ensure that the RAI questions are understandable, the regulatory basis is clear, there is no proprietary information contained in the RAI, and to determine if the information was previously docketed. Please also let me know how much time Tennessee Valley Authority (TVA) needs to respond to the RAI questions.
JustinC.Poole ProjectManager NRR/DORL/LPWB U.S.NuclearRegulatoryCommission (301)4152048 email:Justin.Poole@nrc.gov
Hearing Identifier:
Watts_Bar_2_Operating_LA_Public Email Number:
283 Mail Envelope Properties (19D990B45D535548840D1118C451C74D7F4FB2F212)
Subject:
Draft Request for Additional Information re: FSAR Section 10.2.3 Sent Date:
3/4/2011 11:07:07 AM Received Date:
3/4/2011 11:07:47 AM From:
Poole, Justin Created By:
Justin.Poole@nrc.gov Recipients:
"WBN2HearingFile Resource" <WBN2HearingFile.Resource@nrc.gov>
Tracking Status: None "Crouch, William D" <wdcrouch@tva.gov>
Tracking Status: None Post Office:
HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 643 3/4/2011 11:07:47 AM RAI for WBN-2 Turbine Rotor Integrity.docx 19519 Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
REQUEST FOR ADDITIONAL INFORMATION SECTION 10.2.3, TURBINE ROTOR AND DISK INTEGRITY WATTS BAR NUCLEAR PLANT UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT NO. 99
RAI-1
The applicant addressed the turbine rotor integrity for the WBN-2 in Amendment 102 of FSAR, Section 10.2.3, Turbine Rotor and Disk Integrity. The staff evaluated this section against the acceptance criteria specified in SRP 10.2.3, Turbine Disk Integrity, dated 1981 for low-pressure turbine disks. The acceptance criteria cover five areas: materials selection, fracture toughness, preservice inspection, turbine disk design, and inservice inspection.
Regarding the second criterion (fracture toughness), SRP 10.2.3 requires the ratio of the fracture toughness (KIC) of the rotor material to the maximum tangential stress at speeds from normal to design overspeed be at least 2 in. Further, this criterion requires the KIC be obtained through one of the four methods specified in the SRP. However, Section 10.2.3.1 of Amendment 102 does not indicate how fracture toughness values for the rotor shaft and disks were obtained. Please confirm whether fracture toughness is obtained indirectly through a test data based KIC versus (T-FATT) curve, where T is the operating temperature and FATT is the 50 % fracture appearance transition temperature. If the answer is yes, provide the KIC versus (T-FATT) curve applicable to the WBN 2 turbine; if the answer is no, provide information regarding fracture toughness values for the rotor shaft and disks and how they are obtained.
RAI-2
Regarding the fourth criterion (turbine rotor design), SRP 10.2.3 requires (1) the combined stresses of the low-pressure turbine rotor at design overspeed should not exceed 0.75 of the minimum specified yield strength of the material, and (2) the natural frequencies (critical speeds) of the turbine shaft assemblies should be controlled so as to cause no distress to the unit during operation. The CT-27467 report, which supports Section 3.5.1.3 of Amendment 102, contains the stress distribution of the rotor assembly at a speed exceeding the design overspeed. Section 10.2.3.1 of Amendment 102 contains yield strength ranges for the rotor and the disks. Therefore, Item 1 of this criterion is addressed. However, Amendment 102 does not address Item 2 of this requirement, please provides this information.
RAI-3
Regarding the last criterion (inservice inspection), SRP 10.2.3 requires disassembly of the turbine at approximately 10-year intervals and complete inspection of all normally inaccessible parts, such as couplings, coupling bolts, turbine shafts, low-pressure turbine blades, low-pressure disks, and high-pressure rotors. Amendment 102 does not address this requirement, please provides this information.
