Letter Sequence Response to RAI |
|---|
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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
[Table View] |
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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
[Table view] |
Text
Thomas D. Gatlin Vice President,Nuclear Operations 803.345.4342 A SCANA COMPANY February 1, 2013 RC-13-0017 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001 Attn: E. A. Brown
Dear Sir / 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 ADDITIONAL INFORMATION REGARDING RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION
References:
- 1. Letter from Thomas D. Gatlin to NRC Document Control Desk, dated November 15, 2011, 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)"
- 2. NRC Letter from Robert E. Martin to Thomas D. Gatlin dated July 26, 2012, "Virgil C. Summer Nuclear Station Unit 1 (VCSNS) - Request for Additional Information (TAC NO. ME7586)" ADAMS Accession No. ML12202A027
- 3. Letter from Thomas D. Gatlin to NRC Document Control Desk, dated October 10, 2012, License Amendment Request - LAR-06-00055, "License Amendment Request to Adopt NFPA 805 Response to Request for Additional Information" South Carolina Electric & Gas Company (SCE&G), acting for itself and as agent for South Carolina Public Service Authority, has identified additional information that will further explain the responses to Probability Risk Assessment (PRA) Request for Additional Information (RAI)
Numbers 07, 09, 66, and 68. The additional information is being provided as a result of a January 14, 2013 teleconference regarding Reference 3. The attachment to this letter provides the additional information.
Virgil C.Summer Station. Post Office Box 88 -Jenkinsville, SC( 29065 - F(803) 345-5209
Document Control Desk CR-06-00055 RC-13-0017 Page 2 of 2 There are no regulatory commitments in this letter. If you have any questions regarding 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 0 V,,-,/Thomas D. Gatlin TS/TDG/wm Attachment c: K. B. Marsh S. A. Byrne J. B. Archie T. D. Gatlin N. S. Carns J. H. Hamilton J. W. Williams W. M. Cherry V. M. McCree E. A. Brown NRC Resident Inspector S. E. Jenkins Paulette Ledbetter K. M. Sutton NSRC RTS (CR-06-00055)
File (813.20)
PRSF (RC-13-0017)
Document Control Desk CR-06-00055 Attachment RC.-13-0017 Page 1 of 10 VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) Unit 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ATTACHMENT Probability Risk Assessment Additional Information
Document Control Desk CR-06-00055 Attachment RC-1 3-0017 Page 2 of 10 PRA RAI 07 Section 10 of NUREG/CR-6850 Supplement 1 states that a sensitivity analysis should be performed when using the fire ignition frequencies in the Supplement instead of the fire ignition frequencies provided in Table 6-1 of NUREG/CR-6850. Provide the sensitivity analysis of the impact on using the Supplement 1 frequencies instead of the Table 6-1 frequencies on CDF, LERF, ACDF, and ALERF for all of those bins that are characterized by an alpha that is less than or equal to one. If the sensitivity analysis indicates that the change in risk acceptance guidelines would be exceeded using the values in Table 6-1, justify not meeting the guidelines.
SCE&G Response Based on this RAI and review of Section 10 of NUREG/CR-6850 Supplement 1 (EPRI 1019259), SCE&G has determined that additional work on the sensitivity studies performed for initiating event frequencies used in the fire PRA is warranted. SCE&G will re-submit the response to this RAI by April 1, 2013.
PRA RAI 09 It was recently stated at the industry fire forum that the Phenomena Identification and Ranking Table Panel (PIRT) being conducted for the circuit failure tests from the DESIREE-FIRE and CAROL-FIRE tests may be eliminating the credit for Control Power Transformers (CPTs) (about a factor 2 reduction) currently allowed by Tables 10-1 and 10-3 of NUREG/CR-6850, Vol. 2, as being invalid when estimating circuit failure probabilities. Provide a sensitivity analysis that removes this CPT credit from the PRA and provide new results that show the impact of this potential change on CDF, LERF, ACDF, and ALERF. If the sensitivity analysis indicates that the change in risk acceptance guidelines would be exceeded after eliminating CPT credit, please justify not meeting the guidelines.
SCE&G Response In response to this RAI and PIRT Panel discussions, the circuit failure probabilities that initially took credit for Control Power Transformers (CPTs) have been revised to remove that credit. The results of this change are shown in the table below. The impact on CDF and LERF are not significant. The conclusion of this analysis is that the post-transition plant still complies with NFPA 805 Section 4.2.4.2 when no credit is taken for CPTs.
CDF LERF Baseline with CPT credit 5.62E-05 2.73E-07 CPT credit removed 5.64E-05 2.74E-07 Change from Baseline 2.OOE-07 1.OOE-09
Document Control Desk CR-06-00055 Attachment RC-1 3-0017 Page 3 of 10 PRA RAI 66 FSS-B2-01: It is not clear from the MCR abandonment document what the criteria are for CR abandonment for main control board (MCB) fires. Secondly, from the MCB scenarios the conditional core damage probability (CCDP) does not appear correct for the specified number of panels as given in Appendix B of the Fire Risk Quantification Task 14 document. For example, for scenario CB 17.01 MCB 11-10-1, 11-9-1, and 11-8-1, 2, 3, and 4 panels are failed respectively, yet the CCDP from the quantification document specified that the CCDP is largest when only 2 panels are damaged. Also for scenarios CB17.01 MCB 18-18-1, 18-17-1, 18-16-1, and 18-15-1 the CCDP is the same for each scenario even though 1, 2, 3, and 4 panels are damaged respectively. Provide the criteria for CR evacuation for MCB fires, and justify the CCDPs provided for the various number of panels damaged. The response should take into account a further examination of the CCDPs for MCB fires than identified in this question to evaluate if the CCDP problem is more extensive than discussed in this question. Provide updated CDF, LERF, ACDF, and ALERF values for MCB scenarios.
SCE&G Response The criteria for MCR abandonment are discussed in the response to PRA RAI 08.
The CCDP issue was an error in the model that was due to the FRANX software treatment of mutually exclusive events. The top logic structure of the fault tree (shown below) includes NOT logic that removes cutsets associated with mutually exclusive events. When the FRANX model sets the failures associated with the fire, it sets all of the failed events to TRUE and then compresses the tree and solves it. If two events are mapped to a scenario that appears in the mutually exclusive logic gate (FIREMEX), the gate @CDFALLF is set to FALSE. This means that only the MCR abandonment logic is considered for the scenario. This was the root cause of the issue that resulted in abnormal CCDP results for the main control board scenarios. The model has been updated to address this issue and the updated results for the MCB scenarios are listed in the table below including CDF, LERF, ACDF and ALERF.
Document Control Desk CR-06-00055 Attachment RC-13-0017 Page 4 of 10
Document Control Desk CR-06-00055 Attachment RC-13-0017 Page 5 of 10 Table 1. Main Control Board Fire Scenarios - Results SScenario GF ~~ l~ate-dj 'FCCDP' Update'd CLIE'RP < CDFŽ AER K~CDF. ________F CB17.01_MCB-10-10-1 5.04E-06 8.92E-07 1.77E-01 3.33E-09 6.62E-04 -6.60E-08 -2.80E-10 CB17.01_MCB-10-6-1 4.92E-07 4.31E-07 8.76E-01 8.80E-09 1.79E-02 4.29E-07 8.80E-09 CB17.01_MCB-10-7-1 4.92E-07 4.31E-07 8.76E-01 8.80E-09 1.79E-02 4.29E-07 8.76E-09 CB17.01_MCB-10-8-1 8.21E-07 7.19E-07 8.76E-01 1.47E-08 1.79E-02 7.15E-07 1.46E-08 CB17.01_MCB-10-9-1 1.67E-06 1.29E-06 7.68E-01 3.38E-08 2.02E-02 1.28E-06 3.37E-08 CB17.01_MCB-1-1-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.OOE+00 0.OOE+00 CB17.01_MCB-11-10-1 1.67E-06 2.97E-07 1.77E-01 1.11E-09 6.62E-04 -2.20E-08 -9.OOE-11 CB17.01_MCB-11-11-1 5.04E-06 1.42E-07 2.82E-02 6.01E-11 1.19E-05 6.OOE-09 2.70E-12 CB17.0I_MCB-11-8-1 4.92E-07 4.31E-07 8.76E-01 8.80E-09 1.79E-02 4.29E-07 8.76E-09 CB17.01_MCB-11-9-1 8.21E-07 6.31E-07 7.68E-01 1.66E-08 2.02E-02 6.27E-07 1.65E-08 CB17.01_MCB-12-10-1 8.21E-07 1.45E-07 1.77E-01 5.43E-10 6.62E-04 -1.1OE-08 -4.50E- 11 CB17.01_MCB-12-11-1 1.67E-06 4.71E-08 2.82E-02 2.OOE-11 1.19E-05 2.OOE-09 9.OOE-13 CB17.01_MCB-12-12-1 5.04E-06 1.42E-07 2.81E-02 6.01E-11 1.19E-05 6.OOE-09 2.70E-12 CB17.01_MCB-12-9-1 4.92E-07 3.78E-07 7.68E-01 9.93E-09 2.02E-02 3.76E-07 9.89E-09 CB17.01_MCB-13-10-1 4.92E-07 8.72E-08 1.77E-01 3.26E-10 6.62E-04 -6.40E-09 -2.60E- 11 CB17.01_MCB-13-11-1 8.21E-07 2.33E-08 2.84E-02 9.89E-12 1.20E-05 1.OOE-09 4.30E-13 CB17.01_MCB-13-12-1 1.67E-06 4.76E-08 2.84E-02 2.02E-11 1.20E-05 2.OOE-09 9.OOE-13 CB17.01_MCB-13-13-1 5.04E-06 4.27E-08 8.49E-03 1.80E-11 3.58E-06 6.20E-09 2.60E-12 CB17.01MCB-14-11-1 4.92E-07 1.40E-08 2.84E-02 5.93E-12 1.20E-05 6.OOE-10 2.60E-13 CB17.01_MCB-14-12-1 8.21E-07 2.33E-08 2.84E-02 9.89E-12 1.20E-05 1.OOE-09 4.30E-13 CB17.01_MCB-14-13-1 1.67E-06 1.42E-08 8.49E-03 5.99E-12 3.58E-06 2.1OE-09 8.80E-13 CB17.01_MCB-14-14-1 5.04E-06 4.27E-08 8.49E-03 1.80E-11 3.58E-06 6.20E-09 2.60E-12 CB17.01 MCB-15-12-1 4.92E-07 1.40E-08 2.84E-02 5.93E-12 1.20E-05 6.OOE-10 2.60E-13
Document Control Desk CR-06-00055 Attachment RC-13-0017 Page 6 of 10 CB17.01 MCB-15-13-1 8.21E-07 6.97E-09 8.49E-03 2.94E-12 3.58E-06 1.02E-09 4.30E- 13 CB17.01 MCB-15-14-1 1.67E-06 1.42E-08 8.49E-03 5.99E-12 3.58E-06 2.10E-09 8.80E-13 CB17.01 MCB-15-15-1 5.04E-06 3.82E-08 7.58E-03 1.61E-11 3.20E-06 6.30E-09 2.60E-12 CB17.01 MCB-16-13-1 4.92E-07 4.18E-09 8.49E-03 1.76E-12 3.58E-06 6.10E-10 2.60E-13 CB17.01_MCB-16-14-1 8.21E-07 6.97E-09 8.49E-03 2.94E-12 3.58E-06 1.02E-09 4.30E-13 CB17.01 MCB-16-15-1 1.67E-06 1.27E-08 7.58E-03 5.35E-12 3.20E-06 2.1OE-09 8.80E-13 CB17.01 MCB-16-16-1 5.04E-06 3.82E-08 7.58E-03 1.61E-11 3.20E-06 6.30E-09 2.60E-12 CB17.01 MCB-17-14-1 4.92E-07 4.18E-09 8.49E-03 1.76E-12 3.58E-06 6.10E-10 2.60E-13 CB17.01 MCB-17-15-1 8.21E-07 6.22E-09 7.58E-03 2.62E-12 3.20E-06 1.01E-09 4.30E-13 CB17.01 MCB-17-16-1 1.67E-06 1.27E-08 7.58E-03 5.35E-12 3.20E-06 2.1OE-09 8.80E-13 CB17.01 MCB-17-17-1 5.04E-06 2.43E-08 4.82E-03 1.02E-11 2.03E-06 -7.60E-09 -3.30E-12 CB17.01_MCB-18-15-1 4.92E-07 3.73E-09 7.58E-03 1.57E-12 3.20E-06 1.44E-09 6.07E-13 CB17.01_MCB-18-16-1 8.21E-07 6.22E-09 7.58E-03 2.62E-12 3.20E-06 2.40E-09 1.01E-12 CB17.01_MCB-18-17-1 1.67E-06 8.08E-09 4.82E-03 3.40E-12 2.03E-06 2.90E-10 1.20E-13 CB17.01_MCB-18-18-1 5.04E-06 2.34E-08 4.65E-03 9.85E-12 1.96E-06 0.OOE+00 0.OOE+00 CB17.01_MCB-2-1-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.OOE+00 0.00E+00 CB17.01_MCB-2-2-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.00E+00 0.00E+00 CB17.01_MCB-3-1-1 1.67E-06 7.82E-09 4.67E-03 3.29E-12 1.97E-06 0.OOE+00 0.OOE+00 CB17.01_MCB-3-2-1 1.67E-06 7.82E-09 4.67E-03 3.29E-12 1.97E-06 0.OOE+00 0.OOE+00 CB17.01_MCB-3-3-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.00E+00 0.OOE+00 CB17.01_MCB-4-1-1 1.67E-06 7.82E-09 4.67E-03 3.29E-12 1.97E-06 0.OOE+00 0.OOE+00 CB17.01_MCB-4-2-1 1.67E-06 7.82E-09 4.67E-03 3.29E-12 1.97E-06 0.OOE+00 0.OOE+00 CB17.01_MCB-4-3-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.OOE+00 0.OOE+00 CB17.01_MCB-4-4-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.OOE+00 0.OOE+00
Document Control Desk CR-06-00055 Attachment RC-13-0017 Page 7 of 10 CB17.01_MCB-5-1-1 1.67E-06 7.82E-09 4.67E-03 3.29E-12 1.97E-06 3.00E-11 1.OOE-14 CB17.01_MCB-5-2-1 1.67E-06 7.82E-09 4.67E-03 3.29E-12 1.97E-06 0.OOE+00 O.OOE+00 CB17.01_MCB-5-3-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.OOE+00 0.00E+0 CB17.01_MCB-5-4-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.OOE+00 O.OOE+00 CB17.01_MCB-5-5-1 5.04E-06 2.35E-08 4.67E-03 9.90E-12 1.97E-06 0.00E+00 0.00E+00 CB17.01_MCB-6-1-1 8.21E-07 8.56E-08 1.04E-01 3.62E- 1 4.41.E-05 8.18E-08 3.46E-11 CB17.01_MCB-6-2-1 8.21E-07 8.56E-08 1.04E-01 3.62E-11 4.41E-05 8.18E-08 3.46E-11 CB17.01_MCB-6-3-1 1.67E-06 1.74E-07 1.04E-01 7.38E-11 4.41E-05 8.OOE+00 3.OOE+00 CB17.01_MCB-6-4-1 1.67E-06 1.74E-07 1.04E-01 7.38E-11 4.41E-05 O.00E+00 0.OOE+00 CB17.01_MCB-6-5-1 1.67E-06 1.74E-07 1.04E-01 7.38E-11 4.41E-05 0.OOE+00 0.OOE+00 CB17.01_MCB-6-6-1 5.04E-06 5.25E-07 1.04E-01 2.22E-10 4.41E-05 0.OOE+00 0.OOE+00 CB17.01_MCB-7-1-1 8.21E-07 8.56E-08 1.04E-01 3.62E-11 4.41E-05 8.18E-08 3.46E-11 CB17.01_MCB-7-2-1 8.21E-07 8.56E-08 1.04E-01 3.62E-11 4.41E-05 8.18E-08 3.46E-11 CB17.01_MCB-7-3-1 1.67E-06 1.74E-07 1.04E-01 7.38E-11 4.41E-05 1.66E-07 7.05E-11 CB17.01_MCB-7-4-1 1.67E-06 1.74E-07 1.04E-01 7.38E-11 4.41E-05 1.66E-07 7.05E-11 CB17.01_MCB-7-5-1 1.67E-06 1.74E-07 1.04E-01 7.38E-11 4.41E-05 1.66E-07 7.05E-11 CB17.01_MCB-7-6-1 5.04E-06 5.25E-07 1.04E-01 2.22E-10 4.41E-05 5.02E-07 2.12E-10 CB17.01_MCB-7-7-1 5.04E-06 5.25E-07 1.04E-01 2.22E-10 4.41E-05 5.02E-07 2.12E-10 CB17.01_MCB-8-1-1 4.92E-07 5.25E-08 1.07E-01 7.51E-11 1.53E-04 5.02E-08 7.41E-11 CB17.01_MCB-8-2-1 4.92E-07 5.25E-08 1.07E-01 7.51E-11 1.53E-04 5.02E-08 7.41E-11 CB17.01_MCB-8-3-1 8.21E-07 8.77E-08 1.07E-01 1.25E-10 1.53E-04 8.39E-08 1.23E-10 CB17.01_MCB-8-4-1 8.21E-07 8.77E-08 1.07E-01 1.25E-10 1.53E-04 8.39E-08 1.23E-10 CB17.01_MCB-8-5-1 8.21E-07 8.77E-08 1.07E-01 1.25E-10 1.53E-04 8.39E-08 1.20E-10 CB17.01_MCB-8-6-1 8.21E-07 8.77E-08 1.07E-01 1.25E-10 1.53E-04 8.39E-08 1.20E-10
Document Control Desk CR-06-00055 Attachment RC-13-0017 Page 8 of 10 Tnhi 1 IAlin r.nntrni Rnnrri Firp .qnannrinc - IPici d CB17.01_MCB-8-8-1 5.04E-06 5.38E-07 1.07E-01 7.69E-10 1.53E-04 5.15E-07 7.36E-10 CB17.01_MCB-9-3-1 4.92E-07 4.27E-07 8.69E-01 8.37E-09 1.70E-02 4.25E-07 8.37E-09 CB17.01_MCB-9-4-1 4.92E-07 4.27E-07 8.69E-01 8.37E-09 1.70E-02 4.25E-07 8.37E-09 CB17.01_MCB-9-5-1 4.92E-07 4.27E-07 8.69E-01 8.37E-09 1.70E-02 4.25E-07 8.37E-09 CB17.01 MCB-9-6-1 8.21E-07 7.13E-07 8.69E-01 1.40E-08 1.70E-02 7.09E-07 1.39E-08 CB17.01_MCB-9-7-1 8.21E-07 7.13E-07 8.69E-01 1.40E-08 1.70E-02 7.09E-07 1.39E-08 CB17.01_MCB-9-8-1 1.67E-06 1.45E-06 8.69E-01 2.85E-08 1.70E-02 1.44E-06 2.84E-08 CB17.01 MCB-9-9-1 5.04E-06 3.78E-06 7.50E-01 9.57E-08 1.90E-02 3.76E-06 9.53E-08
Document Control Desk CR-06-00055 Attachment RC-1 3-0017 Page 9 of 10 PRA RAI 68 In the Generic Fire Methodology report, the transient zone describes the zone of damage from the fixed or transient ignition source. According to page 12 of 73 of this report, the transient zone bounds the effect of flame spread or propagation since an extended range of 4 feet beyond the transient zone boundaries was examined for PRA targets. Explain how the transient zone boundary takes into account fire growth over time, or propagation into adjacent transient zones via secondary combustible fires. Should the finding be that the 4 feet margin does not account adequately for these issues, the PRA should be updated accordingly.
SCE&G Response Transient zone boundaries are conservatively established by using walk down results and qualitative criteria, such as where separation between potential targets exists. The transient ignition source is assumed to be located anywhere within the transient zone boundary, so all targets within the boundary are assumed failed. In response to a peer review comment questioning the adequacy of this strategy when the transient source is located on or near the boundary, a review of the transient fire zone of influence determined that 4 feet was a bounding distance. Therefore, the target selection boundary was expanded to include all targets outside, but within 4 feet of, the transient zone boundary.
In practice, this results in an overlap in the boundaries of transient zone areas. The resulting overlap ensures that scenarios postulated at or near a boundary would include nearby targets that are actually within a different scenario area. The overlap distance of 4 ft is justified as follows:
- a. Considering the 98th percentile of a transient fire of approximately 317 kW, a damage criterion for targets of approximately 6 kW/m2, and a radiation fraction of 0.3, the radius r of the zone of influence based on flame radiation is estimated, using the methodology in Chapter 5, Section 5.3.1 of NUREG-1 805, to be 1.1 m or 3.6 ft.
- b. When a fixed ignition source is present in the transient zone area, there are two possibilities with regard to its location relative to the boundaries of the scenario area. First, the fixed ignition source may be completely within the boundaries and not near any of them (i.e., at least 4 ft from the boundaries). In this case, the separation from the boundary, and the fact that the space up to 4 ft from the boundaries has been examined to include nearby targets, bounds any need to assign targets outside the scenario area to fire scenarios that originate in the fixed ignition source. Second, a fixed ignition source may be located on or close to the boundary between adjacent scenario areas. This layout of scenario areas is particularly necessary in electrical rooms where electrical cabinets are targets themselves and must be accounted for in transient fire scenarios postulated on either side of the cabinets. In such cases, to capture all appropriate targets in fire scenarios that originate in the fixed ignition source, the fixed ignition source is assigned to all of the applicable adjacent scenario areas.
HLR-FSS-C of ASME/ANS RA-Sa-2009 requires the factors that relate to the timing and extent of damage be addressed. The peer review characterized all supporting requirements as met at least at Capability Category II. This further supports that the model accounts for fire growth/propagation.
Document Control Desk CR-06-00055 Attachment RC-13-0017 Page 10 of 10 Also note that if the scenario produces a hot gas layer, all targets within the firef zone are assumed failed.
In summary, the use of the 4 ft overlap for each transient scenario in conjunction with the inclusion of fixed ignition sources, located near the transient zone boundary in the adjacent transient zone, has been reviewed and found to be conservative. Therefore no PRA revision was made.
