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MONTHYEARML12168A0012012-06-0808 June 2012 NRR E-mail Capture - Draft RAIs on VC Summer NFPA-805 Review Project stage: Draft RAI ML12202A0272012-07-26026 July 2012 Request for Additional Information Project stage: RAI RC-12-0142, License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805, Response to Request for Additional Information2012-10-10010 October 2012 License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805, Response to Request for Additional Information Project stage: Response to RAI RC-13-0017, License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805, Additional Information Regarding Response to Request for Additional Information2013-02-0101 February 2013 License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805, Additional Information Regarding Response to Request for Additional Information Project stage: Response to RAI ML13142A1572013-05-29029 May 2013 Update for 06/20/13 Meeting Notice with South Carolina Electric & Gas Company Regarding Voluntary Fire Protection Risk Initiative Self Assessment Project stage: Request ML13170A1192013-06-18018 June 2013 Public Slide - Control Room Evacuation Due to Fire, Based on NFPA 805 Project stage: Other ML13170A1302013-06-18018 June 2013 Public Slide - NFPA 805 Transient Combustible Controls Project stage: Other ML13199A1772013-07-31031 July 2013 Summary, June 20, 2013 Category 1 Meeting with South Carolina Electric and Gas Company, to Discuss Voluntary Fire Protection Risk Initiative Self-Assessment Project stage: Meeting ML13218A1952013-08-13013 August 2013 (VCSNS) - Request for Additional Information Project stage: RAI ML13234A4422013-08-28028 August 2013 (VCSNS) - Request for Additional Information Project stage: RAI RC-13-0142, License Amendment Request to Adopt NFPA 805, Response to Request for Additional Information2013-10-14014 October 2013 License Amendment Request to Adopt NFPA 805, Response to Request for Additional Information Project stage: Response to RAI ML13308B8002013-11-0707 November 2013 (VCSNS) - Request for Additional Information Project stage: RAI ML13347B0492013-12-19019 December 2013 (VCSNS) - Request for Additional Information Project stage: RAI RC-14-0002, Response to Request for Additional Information Regarding License Amendment to Adopt NFPA 8052014-01-0909 January 2014 Response to Request for Additional Information Regarding License Amendment to Adopt NFPA 805 Project stage: Response to RAI RC-14-0027, License Amendment Request- LAR-06-00055, License Amendment Request to Adopt NFPA 805, Response to Request for Additional Information2014-02-25025 February 2014 License Amendment Request- LAR-06-00055, License Amendment Request to Adopt NFPA 805, Response to Request for Additional Information Project stage: Response to RAI ML14071A1692014-03-24024 March 2014 Request for Additional Information Project stage: RAI RC-14-0067, License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805 Response to Request for Additional Information2014-05-0202 May 2014 License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805 Response to Request for Additional Information Project stage: Response to RAI RC-14-0083, License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805 - Response to Request for Additional Information2014-05-11011 May 2014 License Amendment Request - LAR-06-00055, License Amendment Request to Adopt NFPA 805 - Response to Request for Additional Information Project stage: Response to RAI ML14182A4732014-07-11011 July 2014 Request for Additional Information Regarding License Amendment Request to Adopt National Fire Protection Association Standard 805 Project stage: RAI RC-14-0129, Response to Request for Additional Information on License Amendment Request LAR-06-00055 and to Adopt NFPA 8052014-08-14014 August 2014 Response to Request for Additional Information on License Amendment Request LAR-06-00055 and to Adopt NFPA 805 Project stage: Response to RAI ML14311A1402014-11-0707 November 2014 Final VC Summer Iepra Ror 10-10-2014.docx Project stage: Request RC-14-0196, License Amendment Request LAR-06-00055 - License Amendment Request to Adopt NFPA 805 Response to Request for Additional Information2014-12-11011 December 2014 License Amendment Request LAR-06-00055 - License Amendment Request to Adopt NFPA 805 Response to Request for Additional Information Project stage: Response to RAI ML14287A2892015-02-11011 February 2015 Issuance of Amendment Regarding Transition to a Risk-Informed, Performance-Based Fire Protection Program in Accordance with 10 CFR 50.48(c) Project stage: Approval ML15041A1682015-02-13013 February 2015 Summary of Site Audit to Support the Review of a License Amendment Request for Virgil C. Summer Nuclear Station, Unit 1, to Transition to the National Fire Protection Association Standard 805 Fire Protection Licensing Basis Project stage: Approval 2013-08-28
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Category:Letter type:RC
MONTHYEARRC-22-0004, (Vcsns), Unit 1 - 2021 Annual Letter of Certification and Testing Results of the Public Alerting System2022-01-14014 January 2022 (Vcsns), Unit 1 - 2021 Annual Letter of Certification and Testing Results of the Public Alerting System RC-18-0157, (Vcsns), Units 1, 2 and 3 Independent Spent Fuel Storage Installation - Order Approving Indirect Transfer of Control of Operating License and Combined Licenses2018-12-28028 December 2018 (Vcsns), Units 1, 2 and 3 Independent Spent Fuel Storage Installation - Order Approving Indirect Transfer of Control of Operating License and Combined Licenses RC-18-0149, ISFSI - Order Approving Indirect Transfer of Control of Operating License and Combined Licenses2018-12-21021 December 2018 ISFSI - Order Approving Indirect Transfer of Control of Operating License and Combined Licenses RC-18-0136, (Vcsns), Unit 1 - Request to Remove the Expired One-Time Extension to Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation and to Remove the Index from Technical Specifications (LAR-18-04683)2018-12-12012 December 2018 (Vcsns), Unit 1 - Request to Remove the Expired One-Time Extension to Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation and to Remove the Index from Technical Specifications (LAR-18-04683) RC-18-0144, (Vcsns), Unit 1 - Core Operating Limits Report (COLR) for Cycle 252018-11-20020 November 2018 (Vcsns), Unit 1 - Core Operating Limits Report (COLR) for Cycle 25 RC-18-0126, (Vcsns), Unit 1 - Notification of an Intended Change a Commitment Date for Open Phase Condition (OPC) Made in RC-17-01692018-11-0909 November 2018 (Vcsns), Unit 1 - Notification of an Intended Change a Commitment Date for Open Phase Condition (OPC) Made in RC-17-0169 RC-18-0070, (Vcsns), Unit 1 - Relief Request RR-4-14, Use of a Performance Based Testing Frequency for Pressure Isolation Valves as an Alternative to the Requirements of the American Society of Mechanical Engineers Code for ...2018-10-0808 October 2018 (Vcsns), Unit 1 - Relief Request RR-4-14, Use of a Performance Based Testing Frequency for Pressure Isolation Valves as an Alternative to the Requirements of the American Society of Mechanical Engineers Code for ... RC-18-0067, (Vcsns), Unit 1 - License Amendment Request - LAR-16-00644 - Revise Reactor Coolant System Operational Leakage Technical Specification Surveillance Requirement 4.4.6.2.22018-10-0808 October 2018 (Vcsns), Unit 1 - License Amendment Request - LAR-16-00644 - Revise Reactor Coolant System Operational Leakage Technical Specification Surveillance Requirement 4.4.6.2.2 RC-18-0123, NRC Request for Information Baseline Radiation Safety Inspection2018-10-0404 October 2018 NRC Request for Information Baseline Radiation Safety Inspection RC-18-0117, (Vcsns), Unit 1 - Fukushima Near-Term Task Force Recommendation 3.1: Seismic Probabilistic Risk Assessment2018-09-28028 September 2018 (Vcsns), Unit 1 - Fukushima Near-Term Task Force Recommendation 3.1: Seismic Probabilistic Risk Assessment RC-18-0112, (Vcsns), Unit 1 - Request for License Amendment to Virgil C. Summer Nuclear Station Technical Specification 3.8.2, D.C. Sources - Operating, Surveillance Requirements 4.8.2.1.B.2 and 4.8.2.1.C.32018-09-27027 September 2018 (Vcsns), Unit 1 - Request for License Amendment to Virgil C. Summer Nuclear Station Technical Specification 3.8.2, D.C. Sources - Operating, Surveillance Requirements 4.8.2.1.B.2 and 4.8.2.1.C.3 RC-18-0119, (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422, Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation2018-09-19019 September 2018 (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422, Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation RC-18-0118, (Vcsns), Unit 1 - Relief Request RR-4-18, Request for a Temporary Non-Code Repair of a Service Water System Flange2018-09-14014 September 2018 (Vcsns), Unit 1 - Relief Request RR-4-18, Request for a Temporary Non-Code Repair of a Service Water System Flange RC-18-0116, (Vcsns), Unit 1 - Request for a One-Time Extension to the Surveillance Frequency 4.4.4.6 of the Core Exit Temperature Instrumentation - Response to Request for Additional Information2018-09-11011 September 2018 (Vcsns), Unit 1 - Request for a One-Time Extension to the Surveillance Frequency 4.4.4.6 of the Core Exit Temperature Instrumentation - Response to Request for Additional Information RC-18-0113, (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation2018-08-31031 August 2018 (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation RC-18-0091, License Amendment Request - LAR-16-01490 National Fire Protection Association Standard 805 Program Revisions2018-08-29029 August 2018 License Amendment Request - LAR-16-01490 National Fire Protection Association Standard 805 Program Revisions RC-18-0111, License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation2018-08-24024 August 2018 License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation RC-18-0100, (Vcsns), Unit 1 - Technical Specification Change Request for the Revision of the Surveillance Frequency of the Turbine Trip Functional Unit: Response to Request for Additional Information2018-08-22022 August 2018 (Vcsns), Unit 1 - Technical Specification Change Request for the Revision of the Surveillance Frequency of the Turbine Trip Functional Unit: Response to Request for Additional Information RC-18-0105, (Vcsns), Unit 1 - Relief Request RR-4-17, Request to Utilize Code Case N-513-3 'Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping Section XI, Division 1' for a Service Water ..2018-08-14014 August 2018 (Vcsns), Unit 1 - Relief Request RR-4-17, Request to Utilize Code Case N-513-3 'Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping Section XI, Division 1' for a Service Water .. RC-18-0102, Withdrawal of Request to Revise Technical Specifications to Correct an Administrative Error2018-08-10010 August 2018 Withdrawal of Request to Revise Technical Specifications to Correct an Administrative Error RC-18-0098, (Vcsns), Units 1, 2 and 3 - Modification of Requested Latest Completion Date in Application for Order Approving Indirect Transfer of Control of Operating License and Combined Licenses2018-07-30030 July 2018 (Vcsns), Units 1, 2 and 3 - Modification of Requested Latest Completion Date in Application for Order Approving Indirect Transfer of Control of Operating License and Combined Licenses RC-18-0085, (Vcsns), Unit 1 - Notification of an Intended Change to a Commitment Made in RC-17-01262018-07-23023 July 2018 (Vcsns), Unit 1 - Notification of an Intended Change to a Commitment Made in RC-17-0126 RC-18-0090, (Vcsns), Unit 1 - Relief Request RR-4-16, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping Response to Request...2018-07-12012 July 2018 (Vcsns), Unit 1 - Relief Request RR-4-16, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping Response to Request... RC-18-0089, (Vcsns), Unit 1 - Relief Request RR-4-16, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping2018-07-11011 July 2018 (Vcsns), Unit 1 - Relief Request RR-4-16, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping RC-18-0084, Virgil C Summer Nuclear Station (Vcsns), Unit 1 - Relief Request RR-4-15, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Laws in Moderate Energy Class 2 or 3 Piping Response to Requ2018-07-0303 July 2018 Virgil C Summer Nuclear Station (Vcsns), Unit 1 - Relief Request RR-4-15, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Laws in Moderate Energy Class 2 or 3 Piping Response to Reques RC-18-0082, Relief Request RR-4-15, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping2018-07-0303 July 2018 Relief Request RR-4-15, Request for Alternative to Implement Code Case N-513-4, Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping RC-18-0079, Vigil C. Summer Nuclear Station (Vcsns), Unit 1 - Request to Revise Technical Specifications to Correct an Administrative Error2018-06-29029 June 2018 Vigil C. Summer Nuclear Station (Vcsns), Unit 1 - Request to Revise Technical Specifications to Correct an Administrative Error RC-18-0074, Change of the Commitment Date of DRIB/105A&B Door Submittal2018-06-18018 June 2018 Change of the Commitment Date of DRIB/105A&B Door Submittal RC-18-0060, (VCSNS) - Request to Revise Technical Specifications to Correct Administrative Error2018-05-30030 May 2018 (VCSNS) - Request to Revise Technical Specifications to Correct Administrative Error RC-18-0064, (Vcsns), Unit 1 - Annual Commitment Change Summary Report2018-05-18018 May 2018 (Vcsns), Unit 1 - Annual Commitment Change Summary Report RC-18-0063, Submittal of 10 CFR 72.48 Biennial Report for the Independent Spent Fuel Storage Installation2018-05-0202 May 2018 Submittal of 10 CFR 72.48 Biennial Report for the Independent Spent Fuel Storage Installation RC-18-0056, (Vcsns), Unit 1 - Licensee Event Reports (2016-001-02, 2016-002-01, 2016-003-02) - Revision to Correct Typographical Errors2018-04-25025 April 2018 (Vcsns), Unit 1 - Licensee Event Reports (2016-001-02, 2016-002-01, 2016-003-02) - Revision to Correct Typographical Errors RC-18-0059, Annual Radioactive Effluent Release Report2018-04-25025 April 2018 Annual Radioactive Effluent Release Report RC-18-0046, License Amendment Request LAR-14-01541 Integrated Leak Rate Test Peak Calculated Containment Internal Pressure Change Request for Additional Information2018-04-19019 April 2018 License Amendment Request LAR-14-01541 Integrated Leak Rate Test Peak Calculated Containment Internal Pressure Change Request for Additional Information RC-18-0036, (Vcsns), Unit 1 - Relief Request RR-4-13, Use of a Risk-Informed Process as an Alternative for the Selection of Class 1 and Class 2 Piping Welds - Response to Request for Additional Information2018-04-0202 April 2018 (Vcsns), Unit 1 - Relief Request RR-4-13, Use of a Risk-Informed Process as an Alternative for the Selection of Class 1 and Class 2 Piping Welds - Response to Request for Additional Information RC-18-0041, Report of Status of Decommissioning Funding2018-03-28028 March 2018 Report of Status of Decommissioning Funding RC-17-0175, Correction to Amendment No. 170 Request to Revise Technical Specifications to Correct Administrative Error2018-01-31031 January 2018 Correction to Amendment No. 170 Request to Revise Technical Specifications to Correct Administrative Error RC-18-0006, Independent Spent Fuel Storage Installation Re Application for Order Approving Indirect Transfer of Control of Operating License and Combined Licenses2018-01-25025 January 2018 Independent Spent Fuel Storage Installation Re Application for Order Approving Indirect Transfer of Control of Operating License and Combined Licenses RC-17-0169, Notification of an Intended Change of a Commitment Date for Open Phase Condition Made in RC-14-00192017-12-11011 December 2017 Notification of an Intended Change of a Commitment Date for Open Phase Condition Made in RC-14-0019 RC-17-0182, (VCSNS) - Anchor Darling Double Disc Gate Valve Information and Status2017-12-11011 December 2017 (VCSNS) - Anchor Darling Double Disc Gate Valve Information and Status RC-17-0172, Notification of Personnel Changes2017-11-30030 November 2017 Notification of Personnel Changes RC-17-0161, Submittal of Change of the Commitment Date of DRIB/105A&B Door2017-11-28028 November 2017 Submittal of Change of the Commitment Date of DRIB/105A&B Door RC-17-0135, Annual Commitment Change Summary Report2017-11-0303 November 2017 Annual Commitment Change Summary Report RC-17-0123, Relief Request RR-4-13, Use of a Risk-Informed Process as an Alternative for the Selection of Class 1 and Class 2 Piping Welds2017-10-30030 October 2017 Relief Request RR-4-13, Use of a Risk-Informed Process as an Alternative for the Selection of Class 1 and Class 2 Piping Welds RC-17-0140, Transmittal of 10 CFR 50.59 Biennial Report2017-10-23023 October 2017 Transmittal of 10 CFR 50.59 Biennial Report RC-17-0107, (Vcsns), Unit 1 - Integrated Leak Rate Test Peak Calculated Containment Internal Pressure Change2017-10-0606 October 2017 (Vcsns), Unit 1 - Integrated Leak Rate Test Peak Calculated Containment Internal Pressure Change RC-17-0134, Response to Request for Supplemental Information, License Amendment Request - LAR-15-01424; Implementation of WCAP-15376-P-A, Revision 12017-09-27027 September 2017 Response to Request for Supplemental Information, License Amendment Request - LAR-15-01424; Implementation of WCAP-15376-P-A, Revision 1 RC-17-0126, Reply to a Notice of Violation, Per Inspection Report 05000395/20170022017-09-0606 September 2017 Reply to a Notice of Violation, Per Inspection Report 05000395/2017002 RC-17-0112, Special Report (Spr) 2017-007 Regarding Waste Gas Holdup System Explosive Gas Monitoring System Being Inoperable for Greater than Thirty Days2017-09-0101 September 2017 Special Report (Spr) 2017-007 Regarding Waste Gas Holdup System Explosive Gas Monitoring System Being Inoperable for Greater than Thirty Days RC-17-0069, (Vcsns), Unit 1 - Quality Assurance Approval Certificate No. 0479, Transmittal of the Quality Assurance Program Description2017-08-30030 August 2017 (Vcsns), Unit 1 - Quality Assurance Approval Certificate No. 0479, Transmittal of the Quality Assurance Program Description 2022-01-14
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Thomas D. Gatlin Vice President,Nuclear Operations 803.345.4342 January 9, 2014 A SCANA COMPANY RC-14-0002 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001 Attn: S. A. Williams
Dear Sir or Madam:
Subject:
VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 LICENSE AMENDMENT REQUEST- LAR-06-00055 LICENSE AMENDMENT REQUEST TO ADOPT NFPA 805 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION
References:
- 1. Thomas D. Gatlin, SCE&G, Letter to NRC Document Control Desk, License Amendment Request - LAR-06-00055, "License Amendment Request to Adopt NFPA 805 Performance-Based Standard for Fire Protection for Light Water Reactor Electric Generating Plants (2001 Edition)" dated November 15, 2011 (RC-11-0149) [ML11321A172]
- 2. Shawn A. Williams, NRC, to Thomas D. Gatlin "Virgil C. Summer Nuclear Station Unit - 1 (VCSNS) - Request for Additional Information (TAC NO. ME7586)" dated November 7, 2013 [ML13308B800]
- 3. Thomas D. Gatlin, SCE&G, Letter to NRC Document Control Desk, License Amendment Request - LAR-06-00055, "License Amendment Request to Adopt NFPA 805 Response to Request for Additional Information" dated October 10, 2012 (RC-12-0142)
- 4. Thomas D. Gatlin, SCE&G, Letter to NRC Document Control Desk, License Amendment Request - LAR-06-00055, "License Amendment Request to Adopt NFPA 805 Response to Request for Additional Information" dated October 14, 2013 (RC-13-0142)
South Carolina Electric & Gas Company (SCE&G), acting for itself and as agent for South Carolina Public Service Authority pursuant to 10 CFR 50.90, submitted a License Amendment Request (LAR) per Reference 1 to adopt NFPA 805. NRC review and audit of this request determined that additional information was required and a Request for Virgil C.Summer Station
- Post Office Box 88 - Jenkinsville, SC- 29065
Document Control Desk LAR-06-00055 RC-14-0002 Page 2 of 2 Additional Information (RAI) was issued per Reference 2. Attachment 1 of this letter provides SCE&G's response to the RAIs.
If you have any questions about this submittal, please contact Mr. Bruce L. Thompson at (803) 931-5042.
I certify under penalty of perjury that the foregoing is correct and true.
Executed on Thomas D. Gatlin RLP/TDG/ts
Attachment:
- 1. Probabilistic Risk Assessment (PRA) Request for Additional Information (RAI)
Responses c: K. B. Marsh S. A. Byrne J. B. Archie N. S. Carns J. H. Hamilton J. W. Williams W. M. Cherry V. M. McCree S. A. Williams NRC Resident Inspector S. E. Jenkins Paulette Ledbetter K. M. Sutton NSRC RTS (CR-06-00055)
File (813.20)
PRSF (RC-14-0002)
Document Control Desk Attachment LAR-06-00055 RC-14-0002 Page 1 of 4 VIRGIL C. SUMMER NUCLEAR STATION UNIT 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ATTACHMENT Probabilistic Risk Assessment (PRA)
Request for Additional Information (RAI) Responses
Document Control Desk Attachment LAR-06-00055 RC-14-0002 Page 2 of 4 Probabilistic Risk Assessment (PRA) RAI 10.02 In a letter dated October 10, 2012 (Agencywide Document Access and Management System (ADAMS) Accession No. ML2297A218), the licensee responded to PRA RAI 10 and provided a detailed description of a series of operator actions to shutdown the facility using a preferred success path after main control room (MCR) abandonment. It appears from the response that this single human error probability (HEP) value is used for every MCR abandonment scenario.
- a. Describe whether any values other -than 0.05 are used to characterize the HEP following MCR abandonment and whether the 0.05 value also represents the conditional core damage probability (CCDP).
- b. If any values other than 0.05 are used, e.g., 1.0, provide the other values, a characterization of the scenarios that these values are used, and a summary of how each value is developed. This information should include explanations of how the following scenarios are addressed.
- i. Scenarios where the fire fails few functions aside from MCR habitability and successful shutdown is straightforward.
ii. Scenarios where the fire could cause some recoverable functional failures or spurious operations that complicate the shutdown but successful shutdown is likely.
iii. Scenarios where the fire induced failures cause great difficulty for shutdown by failing multiple functions andlor complex spurious operations that make successful shutdown unlikely.
- c. If no values other than 0.05 are used, please explain how scenarios characterized under 10.02.b.i, 10.02.b.ii, and 10.02.b.iii are included in your MCR abandonment evaluations.
SCE&G Response At the time of the LAR submittal, the Human Reliability Analysis (HRA) for abandonment was based on the best available information at the time regarding the MCR abandonment procedure, with the knowledge that the procedure would be changing with the change of shutdown strategy away from the Appendix R Self Induced Station Blackout (SISBO) strategy. As discussed in the public meeting on June 20, 2013 (ADAMS Accession No. ML1317OA1 30), SCE&G is developing new procedures associated with control room abandonment. These new procedures are being evaluated for feasibility, and an updated MCR abandonment HRA and Fire Probabilistic Risk Assessment (FPRA) modeling is underway. The new modeling uses a single HEP
Document Control Desk Attachment LAR-06-00055 RC-14-0002 Page 3 of 4 value. It is part of an "OR" gate that also includes failures of instrumentation needed by the operator as a cue or indication in the MCR abandonment procedure as well as failures of equipment that results in loss of function. The effect of the updated analysis will be incorporated in the new results along with other model updates, and will be reported in a revised Attachment G and revised Attachment W. SCE&G will submit the revised LAR Attachment G "Recovery Actions Transition" along with a revised LAR Attachment W "Fire PRA Insights" by February 25, 2014.
PRA RAI 96 Regarding Fact and Observation (F&O) CF-AI-01, the licensee applies Option #2 of Task 10 of NUREG/CR-6850, "EPRI/NRC-RES Fire PRA Methodology for Nuclear Power Facilities," for circuit analysis, as recommended by the peer review. However, by NRC memorandum, "Interim Technical Guidance on Fire-Induced Circuit Failure Mode Likelihood Analysis," dated June 14, 2013 (ADAMS Accession No. ML13165A209), Option #2 "does not provide an adequate method for quantifying the likelihood of hot short-induced spurious operations." As a result, provide a sensitivity analysis, evaluating core damage frequency (CDF),
large early release frequency (LERF), Delta (A)CDF, and ALERF, by substituting an acceptable method for Option #2. It should be noted that Option #1 of Task 10 of NUREG/CR-6850, absent control power transformer (CPT) credit, is an acceptable method, as well as the cited staff guidance NUREGICR-6850.
SCE&G Response Circuit Failure Likelihood in the V.C. Summer Fire PRA is based on use of Option 1. As noted in response PRA RAI 09 in Reference 3 dated October 10, 2012; credit for CPT was removed and sensitivity results presented. Option 2 was not used to determine Circuit Failure Likelihood in the V.C. Summer Fire PRA. Because Option 1 without CPT credit is an acceptable method, no additional sensitivity analysis is required.
Document Control Desk Attachment LAR-06-00055 RC-14-0002 Page 4 of 4 PRA RAI 97 Attachment S, Table S-1, Item ECR50799, of the License Amendment Request (LAR), (ADAMS Accession No. ML11332A076) describes a proposed change of providing lower leakage Reactor Coolant Pump (RCP) seals and crediting them in the Fire Probabilistic Risk Assessment (FPRA). The exact RCP seal package is not specified in the LAR; however, the licensee indicated by teleconference that earlier plans to install the Westinghouse passive thermal shutdown seal (SHIELD) had been abandoned for a different RCP seal package.
As a result:
- a. Describe the type of seal package modeled in the PRA which supports the risk estimates reported in the November 15, 2011, LAR.
- b. If a different seal package is planned to be installed to support transition to NFPA 805 from that which was used in the PRA supporting the November 15, 2011, LAR, identify the new seal package. Also, please answer the following:
- i. Provide the revised risk estimates of the impacts, including the basis for any revised assumptions.
ii. If the new seal package model causes the total change in risk from transitioning to NFPA 805 to exceed the acceptance guidelines of RG 1.174, "An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis," describe the plans to demonstrate that the risk increase is acceptable.
iii. Discuss whether any currently proposed license conditions are affected by these changes.
SCE&G Response The seal package modeled in the PRA supporting the November 15, 2011 LAR is based on the Flowserve N9000 seals. VCSNS intends to install the Flowserve N9000 seal package.
As noted in Reference 4 LAR Attachment S Table S-1, seal replacement will be completed by the end of 2015. Reference 4 LAR Attachment S Table S-2, item 22 also requires update of the PRA to reflect the as-built modifications.