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MONTHYEARML11252A0062011-09-0808 September 2011 Dominion'S Slides Earthquake Response and North Anna Restart Readiness Demonstration Plan Project stage: Request ML11272A1302011-09-27027 September 2011 Request for Additional Information Regarding the Earthquake on August 23, 2011 and Restart Readiness Determination Plan Project stage: Request ML11272A1292011-09-27027 September 2011 Post-Earthquake Restart Readiness Determination Plan Status Update Project stage: Request ML11277A2702011-10-0303 October 2011 Response to Request for Additional Information Regarding Earthquake on August 23, 2011 and Restart Readiness Determination Plan Project stage: Response to RAI ML11286A0182011-10-10010 October 2011 Response to Request for Additional Information Restart Readiness Determination Plan Project stage: Response to RAI ML11290A1702011-10-12012 October 2011 Root Cause Evaluation Re Dual Unit Trip Following August 23, 2011 Earthquake Project stage: Request ML11285A3592011-10-13013 October 2011 Request for Information Regarding the Earthquake of August 23, 2011 Project stage: RAI ML11292A0342011-10-17017 October 2011 Response to Request for Additional Information Regarding the Earthquake on August 23, 2011 and Restart Readiness Determination Plan Project stage: Response to RAI ML11292A1982011-10-18018 October 2011 Response to Request for Additional Information Restart Readiness Determination Plan Project stage: Response to RAI ML11292A1512011-10-18018 October 2011 Independent Spent Fuel Storage Installation - Response to Request for Additional Information Restart Readiness Determination Plan Project stage: Response to RAI ML11297A1222011-10-20020 October 2011 Response to Request for Additional Information, Status of Near-Term Action Items Restart Readiness Determination Plan Project stage: Response to RAI ML11305A0902011-10-28028 October 2011 Response to Request for Additional Information (RAI) Restart Readiness Determination Plan Project stage: Response to RAI ML11305A0912011-10-28028 October 2011 Response to Request for Additional Information Long-Term Questions - Restart Readiness Determination Plan Project stage: Response to RAI ML11307A2292011-10-31031 October 2011 Independent Spent Fuel Storage Installation Determination of Restart Readiness and Long-Term Action Plan to Be Completed After Unit Restart Project stage: Request ML11307A2282011-10-31031 October 2011 Response to Requests for Additional Information, Restart Readiness Determination Plan Project stage: Response to RAI ML11305A0422011-11-0303 November 2011 Action Plan to Address North Anna Power Station Restart as a Result of the August 23, 2011 Earthquake Project stage: Other ML11312A2432011-11-0404 November 2011 Revised Response to Request for Additional Information (RAI) Long-Term Actions to Address Seismic Analysis Considering the August 23, 2011 Earthquake Project stage: Response to RAI ML11311A2012011-11-11011 November 2011 Confirmatory Action Letter Regarding North Anna Power Station, Units 1 and 2 (Naps), Long-Term Commitments to Address Exceeding Design Bases Seismic Event Project stage: Other ML11308B4052011-11-11011 November 2011 Letter, Technical Evaluation Related to Restart Readiness Determination Plan Project stage: Other ML11308B4062011-11-11011 November 2011 Technical Evaluation, Review of Restart Readiness Determination Plan Project stage: Approval ML13329A5462013-11-27027 November 2013 Restart Action Plan (Public) Project stage: Other ML14183B4992014-07-0202 July 2014 Restart Action Plan Project stage: Other 2011-10-03
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Category:Letter
MONTHYEARML24032A1112024-02-0101 February 2024 Owner'S Activity Report for North Anna, Unit 2, Refueling Outage N2R29 - First Period of the Fifth ISI Interval ML24032A4662024-01-16016 January 2024 Response to Comments on Draft Vpdes Permit No. VA0052451 ML24017A0802024-01-11011 January 2024 Notification of Licensed Operator Initial Examination 05000338/2024301 and 05000339/2024301 ML24003A8372024-01-0909 January 2024 Letter to Elizabeth Toombs, Thpo, Cherokee Nation, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8412024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8502024-01-0909 January 2024 Letter to Wenonah Haire, Thpo, Catawba Indian Nation, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML23332A7272024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8382024-01-0909 January 2024 Letter to G. Anne Richardson, Chief, Rappahannock Tribe, Inc., Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML24003A8482024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8392024-01-0909 January 2024 Letter to Gerald Stewart, Chief, Chickahominy Indian Tribe, Eastern Division Re Re Notice of Availability of the Draft Site-Specific Environmental Impact Statement for North Anna Power Station Subsequent License Renewal ML24003A8472024-01-0909 January 2024 Letter to Tom Jonathan, Chief, Tuscarora Nation, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8492024-01-0909 January 2024 Letter to W. Frank Adams, Chief, Upper Mattaponi Tribe Re Re Notice of Availability of the Draft Site-Specific Environmental Impact Statement for North Anna Power Station Subsequent License Renewal ML24003A8462024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8352024-01-0909 January 2024 Letter to Acee Watt, Thpo, United Keetoowah Band of Cherokee Indians in Oklahoma Re Notice of Availability of the Draft Site-Specific Environmental Impact Statement for North Anna Power Station Subsequent License Renewal ML24003A8422024-01-0909 January 2024 Letter to Paul Barton, Thpo, Eastern Shawnee Tribe of Oklahoma, Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML24003A8432024-01-0909 January 2024 Letter to Robert Gray, Chief, Pamunkey Indian Tribe, Notice of Availability of the Draft Site-Specific EIS for North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8362024-01-0909 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML24003A8442024-01-0909 January 2024 Letter to Russell Townsend, Thpo, Eastern Band of Cherokee Indians ML24003A8402024-01-0909 January 2024 Letter to Katelyn Lucas, Thpo, Delaware Nation, Oklahoma, Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML24003A8452024-01-0909 January 2024 Letter to Stephen Adkins, Chief, Chickahominy Indian Tribe, Notice of Availability of Draft Site-Specific Environmental Impact Statement for North Anna Power Station Units 1 and 2, Subsequent License Renewal ML23332A1852024-01-0404 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML23332A0872024-01-0404 January 2024 Notice of Availability of the Draft Site-Specific Environmental Impact Statement for the North Anna Power Station, Units 1 and 2, Subsequent License Renewal ML23360A6352024-01-0404 January 2024 Letter to Dominion Availability for North Anna Units 1 and 2 Draft Site Specific Environmental Impact Statement ML23332A1472023-12-21021 December 2023 Issuance of Environmental Scoping Summary Report Associated with the Staff'S Review of the North Anna Power Station, Units 1 and 2, Subsequent License Renewal Application ML23283A3052023-12-20020 December 2023 Review of Appendix F to DOM-NAF2, Qualification of the Framatome ORFEO-GAIA and ORFEO-NMGRID CHF Correlations in the Dominion Energy VIPRE-D Computer Code (EPID L-2022-LLT-0003) (Nonproprietary) ML23346A0972023-12-11011 December 2023 License Amendment Request to Revise the Emergency Plan Relocation of the Technical Support Center - Response to NRC Request for Additional Information ML23346A1022023-12-11011 December 2023 2024 North Anna Power Station Brq Inspection Notification Letter ML24012A0942023-12-0707 December 2023 GL Report from Dominion Virginia Power Regarding Transfer of Devices ML24012A0892023-12-0707 December 2023 GL Registration from Dominion Virginia Power ML23334A2432023-11-30030 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23362A0602023-11-29029 November 2023 ISFSI, Submittal of Cask Registration for Spent Fuel Storage IR 05000339/20234022023-11-27027 November 2023 Security Baseline Inspection Report 05000338 and 05000339/2023402 IR 05000338/20230032023-11-13013 November 2023 Integrated Inspection Report 05000338/2023003 and 05000339/2023003 ML23311A2042023-10-0909 October 2023 Annual Submittal of Technical Specification Bases Changes Pursuant to Technical Specification 5.5.13.d IR 05000338/20234032023-10-0505 October 2023 Reissue - North Anna Power Station - Cyber Security Inspection Report 05000338/2023403 and 05000339/2023403 (Cover Letter) ML23279A0612023-10-0505 October 2023 Paragon Energy Solutions LLC, Part 21 Final Report Re Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs) ML23230A0502023-10-0202 October 2023 5 of the Quality Assurance Topical Report - Review of Program Changes ML23275A0992023-09-28028 September 2023 Subsequent License Renewal Application Third 10 CFR 54.21(b) Annual Amendment IR 05000338/20230112023-09-26026 September 2023 Quadrennial Focused Engineering Inspection Commercial Grade Dedication Report 05000338/2023011 and 05000339/2023011 ML23242A3482023-09-11011 September 2023 Cyber Security Inspection Report 05000338/2023403 and 05000339/2023403 - Cover ML23254A0242023-09-0606 September 2023 Paragon Energy Solutions LLC, Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs) ML23249A2592023-09-0606 September 2023 Core Operating Limits Report Cycle 30, Pattern Ukr, Revision 0 ML23214A2022023-09-0505 September 2023 Staff Assessment of Updated Seismic Hazards Following the NRC Process for the Ongoing Assessment of Natural Hazards Information 2024-02-01
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML23318A1172023-11-13013 November 2023 NRR E-mail Capture - Formal Issuance of RAIs for North Anna Technical Support Center (TSC) License Amendment Request (LAR) (L-2023-LLA-0006) ML23257A2092023-09-14014 September 2023 NRR E-mail Capture - Formal Issuance of 2nd Round RAIs for Surry Units 1&2 and North Anna Units 1&2 Emergency Plans LAR ML23243A9862023-08-31031 August 2023 NRR E-mail Capture - Draft RAIs for EP Staff Augmentation Times LAR (L-2022-LLA-0166) ML23219A1602023-08-0707 August 2023 003 Radiation Safety Baseline Inspection Information Request ML23171B0522023-06-20020 June 2023 NRR E-mail Capture - RAI for Review of Appendix F to DOM-NAF-2-P (Redacted) ML23081A5282023-04-26026 April 2023 Request for Additional Information - North Anna Subsequent License Renewal Application Environmental Review ML23075A0232023-03-15015 March 2023 NRR E-mail Capture - RAI - License Amend Req (LAR) to Revise Tech Spec (Ts) 3.6.8 Limiting Condition for Operation to Remove Refueling Water Chemical Addition Tank and Replace the Containment Sump Buffer North Anna, 1 and 2 (L-2022-LLA-0162 ML23060A0932023-03-0101 March 2023 NRR E-mail Capture - Formal Issuance of RAIs for Surry/North Anna Emergency Plans LAR ML23059A2282023-02-28028 February 2023 NRR E-mail Capture - Draft RAIs for Containment Buffer Change to Natb (L-2022-LLA-0162) ML22251A1292022-09-0909 September 2022 Request for Additional Information Related to Response to Generic Letter 2004-04 ML22242A0452022-08-23023 August 2022 NRR E-mail Capture - Dominion GL 04-02 Response Draft RAIs (L-2017-LRC-0000) ML22083A2102022-03-24024 March 2022 NRR E-mail Capture - Draft RAI - Relief Request N2-14-LMT-003 Fourth Ten Year Inservice Inspection Interval ML21327A3652021-11-23023 November 2021 NRR E-mail Capture - Draft RAI for TSTF-577 LAR ML21322A0962021-11-18018 November 2021 Final Request for Additional Information Set 5 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Email ML21322A0992021-11-18018 November 2021 Final Request for Additional Information Set 5 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Enclosure ML21256A0672021-09-13013 September 2021 Final Request for Confirmation of Information Set 2 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Email ML21256A0692021-09-13013 September 2021 Final Request for Confirmation of Information Set 2 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Request for Confirmation of Information ML21238A0942021-08-25025 August 2021 Draft Request for Additional Information Set Z - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Email ML21238A0982021-08-25025 August 2021 Draft Request for Additional Information Set Z - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Enclosure ML21225A5022021-08-13013 August 2021 Request for Additional Information for North Anna Power Station, Units 1 and 2, Surry Power Station, Units 1 and 2, and Millstone Power Station, Units 2 and 3, Appendix E of Fleet Report Com-Naf-2 (EPID:L02021-LLT-0000) Public Version ML21195A2442021-07-13013 July 2021 NRR E-mail Capture - Draft RAI Appendix E to Topical Report DOM-NAF-2 Qualification of the Framatome BWU-I CHF Correlation in the Dominion Energy VIPRE-D Computer Code ML21188A1632021-07-0707 July 2021 Final Request for Additional Information Set 4 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Email ML21188A1652021-07-0707 July 2021 Final Request for Additional Information Set 4 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Enclosure ML21174A1952021-06-23023 June 2021 Safety RAIs - Set Y - Draft - Enclosure ML21166A3512021-06-15015 June 2021 Safety RAIs - Set 4 - Draft ML21123A2972021-05-0303 May 2021 Final Request for Additional Information Set 3 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - E-mail ML21123A2982021-05-0303 May 2021 Final Request for Additional Information Set 3 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Enclosure ML21091A0032021-04-0101 April 2021 Final Request for Additional Information Set 2 - North Anna SLRA Safety Review (EPID No. L-2020-SLR-0000) - Enclosure 1 - RAIs ML21091A0042021-04-0101 April 2021 SLRA Safety Review - Withdrawn Requests for Information (EPID No. L-2020-SLR-0000) - Enclosure 2 ML21076A4622021-03-17017 March 2021 NRR E-mail Capture - Draft RAI for Versatile Internals and Component Program for Reactors Vipre Code Review (L-2021-LLT-0000) ML21075A0032021-03-12012 March 2021 Emergency Preparedness Exercise Inspection Request for Information for - Brunswick, Catawba, North Anna, Oconee, Vogtle 1 & 2 ML21063A5602021-03-0404 March 2021 Final Request for Additional Information Set 1 - North Anna SLRA Safety Review (EPID L-2020-SLR-0000) - Enclosure ML21049A0212021-02-17017 February 2021 Notification of an NRC Fire Protection Team Inspection (FPTI) (NRC Inspection Report 05000338/2021012 and 05000339/2021012) and Request for Information (RFI) ML21028A3902021-01-29029 January 2021 Request for Additional Information - North Anna Subsequent License Renewal Application Environmental Review (EPID Number: L-2020-SLE-0000) (Docket: 50-338 and 50-339) ML21028A4352021-01-28028 January 2021 Notification of Target Set Inspection and Request for Information (NRC Inspection Report No. 05000338/2021404 and 05000339/2021404) ML21012A3412021-01-22022 January 2021 Requests for Confirmation of Information for the Environmental Review of the North Anna Power Station, Units 1 and 2, Subsequent License Renewal Application (EPID Number: L-2020-SLE-0000) (Docket: 50-338 and 50-339) ML21019A4512021-01-19019 January 2021 Notification of Inspection and Request for Information ML20316A0422020-11-10010 November 2020 NRR E-mail Capture - FW: Draft RAI for North Anna Unit 2 Steam Generator Tube Inspection Report (ML19179A075) ML20223A3412020-08-10010 August 2020 003 Radiation Safety Baseline Inspection Information Request ML20218A4282020-08-0505 August 2020 Notification of Inspection and Request for Information ML20125A0762020-05-0101 May 2020 NRR E-mail Capture - Draft RAI Related to Revised Reactor Vessel Material Surveillance Capsule Withdrawal Schedule Dominion Energy Virginia North Anna Power Station Units 1 and 2 (L-2020-LLL-0038) ML20113A5792020-04-21021 April 2020 NRR E-mail Capture - Draft RAI North Anna Fifth 10-year Interval Relief Request (L-2020-LLR-0023) ML19354B6142019-12-20020 December 2019 NRR E-mail Capture - Draft RAI for North Anna Relief Request P-9 ML19317F1042019-11-0707 November 2019 NRR E-mail Capture - Draft RAIs for SB LOCA LAR (Non Prop) ML19191A2512019-07-10010 July 2019 NRR E-mail Capture - Request for Additional Information Open Phase Condition LAR ML19169A0962019-06-17017 June 2019 NRR E-mail Capture - Request for Additional Information Emergency Action Level Scheme Change for Millstone Power Station - Units 1, 2, and 3, North Anna Power Station - Units 1 and 2, and Surry Power Station - Units 1 and 2 ML19162A0052019-06-10010 June 2019 NRR E-mail Capture - Draft RAIs for Dominion EAL Scheme Change ML19108A1902019-04-18018 April 2019 Emergency Preparedness Program Inspection Request for Information ML19060A2432019-03-0101 March 2019 Related to License Amendment Request to Address Open Phase Conditions ML18337A1312018-11-29029 November 2018 NRR E-mail Capture - North Anna SPRA (Fukushima 50.54f) Audit Follow-Up Clarification Question on Plant Modifications 2023-09-14
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 October 13, 2011 Mr. David A. Heacock President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
NORTH ANNA POWER STATION, UNIT NOS. 1 AND 2, REQUEST FOR INFORMATION REGARDING THE EARTHQUAKE OF AUGUST 23, 2011 (TAC NOS. ME7254 AND ME7255)
Dear Mr. Heacock:
The Nuclear Regulatory Commission staff is continuing its review of information submitted by the Virginia Electric and Power Company regarding activities conducted in response to the earthquake that occurred near the North Anna Power Station, Unit Nos. 1 and 2 (NAPS) on August 23, 2011.
This letter forwards requests for information on licensing, mechanical and civil engineering, piping, snubbers, and pumps and valves. Your expeditious response is requested to enable the staff to continue its review of your proposed plans for restarting the NAPS.
Sincerely, Meena Khanna Lead of North Anna Restart Team Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-338 and 50-339
Enclosure:
Request for Information cc w/encl: Distribution via Listserv
REQUEST FOR INFORMATION VIRGINIA ELECTRIC AND POWER COMPANY (VEPCO)
NORTH ANNA POWER STATION, UNIT NOS. 1 AND 2 DOCKET NOS. 50-338 AND 50-339 The following requests for information are related to the earthquake of August 23, 2011, that occurred in the vicinity of the North Anna Power Station, Unit Nos. 1 and 2 (NAPS). Previous requests for information were issued on September 14, September 26, September 28, September 30 and October 6, 2011.
Licensing Questions:
- 1. Summarize the plans during mode changes and power ascensions (e.g., any planned walk downs, inspections, tests or evaluations) for NAPS. Also, provide the schedule for submitting the NAPS Restart Plan.
- 2. By letter dated September 17,2011, the licensee stated that its readiness assessment was based, in part, on the guidance of Regulatory Guide (RG) 1.167, "Restart of a Nuclear Plant Shut down by a Seismic Event."
(a) RG 1.167, Section C.2, states that "coincident with the long term evaluations, the plant should be restored to its current licensing basis." In that same letter on pages 3 and 4, the licensee mentioned that a licensing basis review and evaluation has been performed. The staff requests that the licensee summarize the scope and results of the licensing basis review that was conducted, and plans for addreSSing RG 1.167, Section C.2.
(b) RG 1.167 states that "Holders of an operating license or construction permit issued prior to January 10, 1997, may voluntarily implement the methods described in this guide..." Discuss whether VEPCO plans to implement RG 1.167 and the referenced EPRI report, in their entirety. If not, identify all planned deviations from this guidance.
- 3. The staff requests that the licensee describe its long term plans for revaluating its design/licensing basis and updating the Final Safety Analysis Report for NAPS, Units 1 and
- 2. Further, the staff requests that the licensee provide a schedule for completion of these items and a justification for the proposed schedule.
Enclosure
- 2 Mechanical and Civil Engineering Supplemental Questions Short Term:
- 1. Nuclear Regulatory Commission Inspection Manual Part 9900, "Operability Determinations
& Functionality Assessments for Resolution of Degraded or Nonconforming Conditions Adverse to Quality or Safety," Section C.10, states that piping or pipe supports in a degraded or nonconforming condition should be evaluated in accordance with the criteria of Appendix F of the American Society of Mechanical Engineers (ASME) Boiler & Pressure Vessel (B&PV) Code,Section III, to demonstrate operability/functionality of the affected piping and supports. Confirm that the aforementioned Appendix F criteria have been utilized in the operability/functionality determination of piping and pipe supports which are required to be operable/functional. If the criteria of Appendix F have not been utilized in these operability determinations, please state the criteria or evaluation methods utilized to demonstrate operability/functionality of the piping and pipe supports in lieu of the Appendix F criteria. If sampling is utilized for analytical models for piping and pipe supports which are required to be seismically qualified by structural analysis, please discuss the criteria and methods of sampling that will ensure structural operability/functionality of the remainder population of piping and pipe supports.
Short Term and Long Term:
- 2. Discuss the method which will be used to identify welds for inspections and identify the type of inspections that will be performed for pre-restart and post-restart.
Long Term:
- 3. Discuss the post-restart (i.e., long-term) actions in place (Le., those included within the corrective action program) to evaluate seismically qualified piping and pipe supports, including those structures, systems, and components (SSCs) discussed on pages 4 and 5 of the September 17,2011, submittal, to demonstrate compliance with the licensing and design basis and/or applicable design basis code criteria/requirements, when these evaluations consider seismic loadings, {Operating Basis Earthquake (OBE) and DeSign Basis Eearthquake (DBE>> derived from the August 23, 2011, seismic event, combined with all other applicable load cases.
Piping Supplemental Questions Short Term:
Appendix 5A of the NAPS UFSAR, discusses the topic of fabrication flaws, (e.g. laminar tears, porosity, lack of fusion, fabrication induced cracking, etc.) that were detected in some of the NAPS steam generator supports and reactor coolant pump supports. The Updated Final Safety Analysis Report (UFSAR) appendix indicates that at least some of the flaws were subject to repairs at the facility. The UFSAR appendix states that ultrasonic testing (UT) methods are the proper non-destructive methods to use for detecting and sizing flaws of this nature. The UFSAR appendix also provided a flaw evaluation to support the licensee's conclusion that the flaws would be stable under the following types of assumed loading combinations: (1) static (dead weight) loads; (2) dynamic loads associated with the occurrence of five OBE events, as is assumed for in the deSign basis; (3) loads associated with an assumed loss of coolant accident
-3 (LOCA) pipe rupture plus those that would be imparted under the assumed DBE that was assumed in the design basis; and (4) possible pump vibratory loads, which are expected to be small in magnitude. The UFSAR appendix indicates that the emphasis was placed on the analysis of the flaws under the combined LOCA plus DBE loads for the facility.
It is not evident to the staff how many of the flaw indications mentioned in UFSAR, Appendix 5A for these supports were repaired or replaced as the appropriate corrective action for the components and how many of the flaws were left in service and justified for further service using the flaw tolerance evaluation that was included in UFSAR appendix. Provide the basis, using a detailed technical discussion, for why the current flaw evaluation in UFSAR, Appendix 5A is considered to be valid and bounding for evaluation of any relevant component support flaw indications that remain in service without repair, when compared to the option of requiring reanalysis of the flaws using the loadings from the LOCA event plus those that would have been imparted to the flaws from the August 2011 beyond-design-basis earthquake event. Justify why additional UT examinations of these component supports do not need to be imposed as a condition for restart of North Anna Unit 2 and for continued operation of these components supports.
Snubbers 1 The following is in regard to the previously issued snubber questions numbered 2 and 4, which were responded to in VEPCO's letters of October 3, 2011 (11-566) and October 10, 2011, (11-566A).
Short Term:
- 2. The second paragraph of the October 10,2011, response (11-566A), to snubber question 2, states: "These visual inspection results are consistent with the previous visual inspection performed in the spring of 2009." The last paragraph of the response to question 2 for Unit 2 states: "These visual inspection results are consistent with the previous visual inspections performed in spring 2010."
- a. Provide additional details on the Unit 1 spring 2009 inspections results beyond just stating that they are consistent with previous examination results.
- b. Provide details about any fourth inservice interval snubber examination and testing (based on the Technical Requirements Manual (TRM) program) for Unit 1 that may have been performed between Spring 2009 and Summer 2011. If no such snubber examination or testing was performed, provide the basis for that condition.
I To date, a response has not been provided to the long-term question from the September 28,2011, request for information. Please confirm that analyses will be performed to ensure the snubbers are designed (with appropriate factors of safety) to withstand loads comparable to or greater than that observed during the August 23, 2011 earthquake.
-4
- c. Provide additional details on the Unit 2 spring 2010 inspections results beyond just stating that they are consistent with previous examination results.
- d. The response to question 2 states that "The attachment lug will be repaired and the associated snubber will be replaced and functionally tested." Provide the date when this will be completed.
- 4. The second paragraph of the October 10, 2011, response to Snubber Question 4, states that:
In addition to the TRM functional test group for Unit 2, an additional twelve (12) small bore snubbers have been selected from Unit 1 for functional testing. This sample was developed based on a combination of various buildings/elevation, ease of access (ALARA, scaffold concerns, etc.), and snubbers expected to experience high loading during a seismic event. Also, two (2) large bore snubbers on Unit 1 will be tested. The Unit 1 snubber testing will be completed prior to entering Mode 4 on Unit 1. 2
- a. Explain the method or evaluation that was performed to determine which snubber may have experienced higher loads during the seismic event at NAPS.
- b. Explain the method or evaluation that was performed to identify snubbers that may have exceeded their design load capacity as a result of the August 23, 2011, seismic event felt at NAPS. Furthermore, discuss the prior-to-restart actions that will be taken to ensure proper operation for these snubbers.
- d. Regarding the last sentence in the response to question 4 above, discuss the action to be taken, prior to entering Mode 4, if the snubber test results are unacceptable.
Pumps and Valves Short Term
- 1. Please discuss your inspections and evaluations to determine that all the safety-related pumps and valves (manual, AOVs, MOVs, POVs, RVs, and associated actuators) are operationally ready and functional following the August 23, 2011 earthquake. If no such inspections/evaluations were performed, please justify why they are not needed. Provide your response for each unit separately.
- 2. Discuss if each safety-related pump in your Inservice Testing (1ST) Program will be tested (Le" quarterly test, comprehensive test) in order to demonstrate operational readiness and functionality. If tests will not be performed for some pumps prior to restart, please discuss why they are not needed and how these pumps are judged to be operationally ready to perform their designated safety functions. Where tests will be performed, prior to restart, provide the results from this testing. Provide your response for each unit separately.
2 Also see question 2.b above.
- 5
- 3. Discuss if each safety-related valve in your 1ST Program will be tested in order to demonstrate operational readiness and functionality. If tests will not be performed for some of these valves prior to restart, please discuss why they are not needed and how the valves are judged to be acceptable to perform their designated safety functions. Where tests will be performed, prior to restart, provide the results from this testing. Provide your response for each unit separately.
Long Term
- 4. Please discuss your planned approach and evaluations to confirm that appropriate design factors of safety are maintained if safety-related pumps and valves are subjected to seismic acceleration loads comparable to those observed during the August 23, 2011 earthquake.
Provide your response for each unit separately.
ML11285A359 I OFFICE I NRRJPM NRRJBC NRRJDORUDD I NAME I RMartin MKhanna AHowe I DATE I 10/13/11 10/13/11 10/13111