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Category:Memoranda
MONTHYEARML24089A0712024-04-0101 April 2024
3/20/24 & 3/27/24 2023 TVA Public Annual Assessment Meeting Summary
ML23142A2132023-05-22022 May 2023
Public Meeting Summary - 2022 Annual Assessment Meetings for Browns Ferry, Sequoyah and Watts Bar Nuclear Plants
ML21137A0022021-05-17017 May 2021
Public Meeting Summary - Browns Ferry, Sequoyah and Watts Bar Nuclear Plants, Docket Nos. 50-259, 50-260, 50-296, 50-327, 50-328, 50-390, and 50-391, Meeting Number 20210392
ML21060A9122021-03-17017 March 2021
Memo to File: Final Environmental Assessment and Finding of No Significant Impact for Initial and Updated Decommissioning Funding Plans for Watts Bar ISFSI
ML20127H8412020-05-0606 May 2020
Public Meeting Summary - Browns Ferry, Sequoyah and Watts Bar Nuclear Plant, Meeting No. 20200384
ML19142A3602019-05-21021 May 2019
May 9, 2019 Summary of Public Meeting; Watts Bar Nuclear Plant
ML18227A5992018-08-23023 August 2018
Request to Use a Later Edition of the Asme Boiler and Pressure Vessel Code, Section XI for Containment Inservice Inspection Activities
ML18165A3962018-06-14014 June 2018
Summary of Public Meeting Concerning Annual Assessment of Watts Bar Nuclear Plant - Docket Nos. 50-390 and 391
ML17356A2692017-12-20020 December 2017
Construction Lessons Learned Report
ML17332A2012017-11-28028 November 2017
Approval for Exceedance of the Watts Bar Maximum Baseline Inspection Samples
ML17192A0312017-06-26026 June 2017
Construction Inspection and Oversight Lessons Learned
ML17151A5092017-05-31031 May 2017
Public Meeting Summary - 2016 Annual Assessment Public Meeting Regarding Watts Bar Nuclear Plant
ML16252A2042016-09-0909 September 2016
Memo Ico Staff Review of Watts Bar Nuclear Plant Security Plan, Training and Qualification Plan, Safeguards Contingency Plan, Revision 20 (Ns113989) for Verification of ASM Order EA-14-044 Implementation (Cac# L25130)
ML16194A2522016-07-12012 July 2016
Memorandum to T. Mossman Technical Assistance Request-Review of Physical Security Plan for the Watts Bar Nuclear Plant Independent Spent Fuel Storage Installation (CAC No. L25130)
ML16131A6172016-05-10010 May 2016
Summary of Public Meeting with Watts Bar, Units 1 and 2, to Discuss the Annual Assessment
ML15259A4172015-10-21021 October 2015
the U.S. Nuclear Regulatory Commission Staff Evaluation of the Final Rule for Continued Storage of Spent Nuclear Fuel for the Operating License Environmental Review for Watts Bar Nuclear Plant, Unit 2
ML15288A3052015-10-15015 October 2015
Readiness of Watts Bar Unit 2 to Receive an Operating License
ML15096A2042015-04-23023 April 2015
Reactor Oversight Process Transition Plan for Watts Bar Nuclear Plant, Unit 2
ML15104A2982015-04-10010 April 2015
March 26, 2015, Summary of Public Meeting with Watts Bar, Unit 2, Senior Management
ML15104A2392015-04-10010 April 2015
March 26, 2015, Summary of Public Meeting with Watts Bar, Unit 2, EOC Assessment
ML15084A4242015-03-25025 March 2015
March 17, 2015, Summary of Public Meeting with Watts Bar, Unit 1, Concerning Annual Assessment
ML15015A4772015-02-0202 February 2015
Environmental Protection Plan (Non-Radiological) Technical Specification Review
ML14247A4522014-08-28028 August 2014
FEMA Response to NRC for Watts Bar Nuclear Site
ML14234A1462014-08-20020 August 2014
Memo to D. Safer Re M141030: Welcome Package for D.Safer for the Briefing on Watts Bar Unit 2 License Application Review
ML14231B0102014-08-19019 August 2014
Summary of the Public Meeting to Discuss Aspects of Tva'S Response to 2009 Confirmatory Order, August 18, 2014
ML14197A6082014-08-0606 August 2014
July 1, 2014, Summary of Category 1 Public Meeting with Tennessee Valley Authority to Discuss Seismic Hazard Reevaluations Associated with Implementation of Japan Lessons-Learned Near-Term Task Force Recommendation 2.1
ML14364A1682014-06-0202 June 2014
Flowserve Corp., Vermont, Formal Evaluation of Deviations Reported - Notification of Defect - Watts Bar II
ML14015A4522014-01-16016 January 2014
Notice of Meeting with Tennessee Valley Authority Regarding Open Items for Watts Bar Unit 2
ML14014A3262014-01-16016 January 2014
Notice of Forthcoming Meeting with Tennessee Valley Authority Regarding Watts Bar Nuclear Plant (WBN) Unit 1 Fire Protection Amendment Request
ML13352A4332013-12-19019 December 2013
Notice of Meeting with Tennessee Valley Authority Regarding Status of Construction and Licensing of Watts Bar Nuclear Plant, Unit 2
ML13213A4102013-08-0202 August 2013
Notice of Forthcoming Meeting with Tennessee Valley Authority on Watts Bar Electrical System LAR Review
ML13126A2522013-07-25025 July 2013
Request for Additional Information on the 2013 Decommissioning Funding Status Report
ML13149A1222013-05-30030 May 2013
Notice of Meeting with Tennessee Valley Authority Regarding Status of Construction and Licensing of Watts Bar Nuclear Plant, Unit 2
ML13105A3942013-04-16016 April 2013
Location Change - Notice of Forthcoming Meeting for Public Meeting with Tennessee Valley Authority (TVA) on 2.1 Response Extension Request, Sequoyah Nuclear Plant and Watts Bar Nuclear Plant
ML13078A4212013-03-19019 March 2013
Public Meeting Notice Tennessee Valley Authority, Browns Ferry, Sequoyah, Watts Bar for Commercial Grade Dedication Program
ML13072A1212013-03-19019 March 2013
Differing Professional Opinion Involving External Flooding (DPO-2012-003)
ML13035A0572013-02-0404 February 2013
2/7/13 Cancellation of Public Meeting with TVA Re 2.1 Response Schedule for Watts Bar Nuclear Plant, Unit 1
ML13025A1742013-01-25025 January 2013
Meeting Notice with TVA to Discuss the Schedule to Respond to Recommendation 2.1 of the Near-Term Task Force Review of the Insights from the Fukushima Da-ichi Accident
ML13007A0452013-01-0808 January 2013
1/23/13 Notice of Forthcoming Meeting with Tennessee Valley Authority Proposed Watts Bar Nuclear Plant, Units 1 License Amendment
ML12362A1132012-12-27027 December 2012
1/7/2013 Cancellation Notice of Public Meeting with TVA Re Watts Bar Nuclear Plant, Units 1 and 2, Regarding a Proposed License Amendment Request
ML12319A1722012-11-14014 November 2012
Meeting Notice with Tennessee Valley Authority to Discuss Hydrology Issues at Watts Bar Nuclear Plant, Unit 1
IR 05000390/20100082012-07-0606 July 2012
Errata for Electronic Closure of Watts Bar Inspection Report 05000390/2010-008 Memo Dated July 21, 2011 (ML 112020591)
ML12158A5082012-06-12012 June 2012
Safety Concern Regarding Hydrology/Flooding Subsequent to May 31, 2012, Public Meeting
ML12109A4282012-05-17017 May 2012
Final TIA 4 18 12
ML12122A6742012-05-0303 May 2012
Open Door Policy in the Matter of Watts Bar Nuclear Plant, Unit 1-Safety Concern Regarding Hydrology/Flooding
ML12115A1652012-04-24024 April 2012
Follow-Up to Safety Concern Regarding Hydrology/Flooding
ML1207501092012-03-15015 March 2012
Notice of Meeting with Tennessee Valley Authority to Discuss Pre-submittal Planning for Licensing Basis Change Regarding Hydrology for Watts Bar Nuclear Plant, Unit 1
ML1204610612012-02-0606 February 2012
Minutes of the ACRS Plant Operations and Fire Proctection Subcommittee Meeting December 15, 2011 (Open)
IR 05000327/20100082011-07-21021 July 2011
IR 05000327-10-008, 05000328-10-008 for Electronic Closure of Sequoyah, and IR 05000390-10-008 for Watts Bar
ML1120205912011-07-21021 July 2011
IR 05000327-10-008, 05000328-10-008 for Electronic Closure of Sequoyah, and IR 05000390-10-008 for Watts Bar
2024-04-01
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Text
November 22, 2006 MEMORANDUM TO: Douglas Pickett, Acting Branch Chief Plant Licensing Branch II-2 Division of Operating Reactor Licensing FROM: Michael Scott, Branch Chief /RA/
Safety Issue Resolution Branch Division of Safety Systems
SUBJECT:
REPORT ON RESULTS OF STAFF PLANT AUDIT- WATTS BAR UNIT 1 NUCLEAR PLANT CORRECTIVE ACTIONS TO ADDRESS GENERIC LETTER 2004-02 Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors, requested that all PWR licensees (1) evaluate the adequacy of the emergency sump recirculation function with respect to potentially adverse effects associated with post-accident debris, and (2) implement any plant modifications the evaluation determined to be necessary. Watts Bar Nuclear Power Plant (WBN) has conducted an evaluation of recirculation sump performance and is in the process of installing a new strainer during the fall 2006 refueling outage.
The staff has conducted a detailed audit of new sump design and the associated analysis and testing of WBN. This is one of several audits to be conducted for a sample of licensees to help verify the adequacy of licensee corrective actions to address GL 2004-02. This memorandum transmits the attached audit report to the Division of Operating Reactor Licensing for forwarding to the licensee. In addition to providing the WBN licensee feedback on its sump performance evaluation, the report also documents staff findings which have significant generic implications.
Therefore, the report (when ultimately made publically available) will serve as a vehicle to inform other licensees of the staffs technical positions.
The licensee was very supportive during the staffs audit. In particular the staff appreciates WBNs effort to obtain detailed reactor vessel internal structure hydraulic data. This first audit was a learning process for both the licensee and the regulator, and the licensees flexibility and cooperation were crucial in the successful completion of the audit.
CONTACT: Shanlai Lu, NRR/DSS/SSIB 301-415-2869
D. Pickett 2 The staffs audit report summarizes the plant modifications planned by the licensee to improve recirculation sump performance, which include:
- Increasing the strainer area from 200 ft2 to approximately 4600 ft2
- Reducing strainer opening size from large mesh to holes less than 1/8" diameter
- Modifying the Emergency Core Cooling System (ECCS) injection line throttle valve settings and flow element The audit report includes a review of the design of the licensees planned sump modifications, the licensees evaluation of upstream and downstream blockage, and other post-accident debris effects identified in GL 2004-02. The audit report provides detailed feedback to the licensee in each section of the licensees sump performance evaluation (e.g., debris generation, debris transport, head loss), identifying areas that were adequately addressed as well as areas for which further analysis or justification may be warranted. The final conclusions regarding the adequacy of the licensees corrective actions for GL 2004-02 will be based on the staffs review of open items resulting from this audit, as well as on any other supplemental responses the licensee may make to GL 2004-02. Overall, the staffs impression is that WBN new sump modifications appear to be robust with sufficient design margin.
The audit did not comprehensively evaluate whether the licensee has identified and/or submitted appropriate licensing documents as a result of its planned changes to address GSI-191. The licensees maintenance of its licensing basis is within the scope of the Reactor Oversight Program.
Enclosure:
Plant Audit Report- WATTS BAR UNIT 1 NUCLEAR POWER PLANT CORRECTIVE ACTIONS FOR GENERIC LETTER 2004-02
D. Pickett 2 The staffs audit report summarizes the plant modifications planned by the licensee to improve recirculation sump performance, which include:
- Increasing the strainer area from 200 ft2 to approximately 4600 ft2
- Reducing strainer opening size from large mesh to holes less than 1/8" diameter
- Modifying the Emergency Core Cooling System (ECCS) injection line throttle valve settings and flow element The audit report includes a review of the design of the licensees planned sump modifications, the licensees evaluation of upstream and downstream blockage, and other post-accident debris effects identified in GL 2004-02. The audit report provides detailed feedback to the licensee in each section of the licensees sump performance evaluation (e.g., debris generation, debris transport, head loss), identifying areas that were adequately addressed as well as areas for which further analysis or justification may be warranted. The final conclusions regarding the adequacy of the licensees corrective actions for GL 2004-02 will be based on the staffs review of open items resulting from this audit, as well as on any other supplemental responses the licensee may make to GL 2004-02. Overall, the staffs impression is that WBN new sump modifications appear to be robust with sufficient design margin.
The audit did not comprehensively evaluate whether the licensee has identified and/or submitted appropriate licensing documents as a result of its planned changes to address GSI-191. The licensees maintenance of its licensing basis is within the scope of the Reactor Oversight Program.
Enclosure:
Plant Audit Report- WATTS BAR UNIT 1 NUCLEAR POWER PLANT CORRECTIVE ACTIONS FOR GENERIC LETTER 2004-02 DISTRIBUTION: ADAMS SSIB R/F RArchitzel JLehning MScott THafera MYoder SUnikewicz HWagage DPicket SLu RReyes PKlein RLobel LWhitney SSamaddar TMartin JWermeil ADAMS PACKAGE #: ML062120461 MEMO: ML062120463 ATTACHMENTS:(Audit Report) ML062120469 ML062120472 (Report Appendices)
OFFICE SSIB:DSS:NRR CSG:DCI:NRR EGCB:DE:NRR NAME SLu AHiser SSamaddar DATE 10/11/06 11/ 16 /06 11/ 16 /06 OFFICE SNPB:DSS:NRR SSIB:DSS:NRR (Acting Branch Chief)
NAME RLandry MScot DATE 11/ 17 /06 11/ 22 /06 OFFICIAL RECORD COPY
