Letter Sequence Response to RAI |
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Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance
Results
Other: ML110872079, ML11145A064, ML11256A057, ML11256A058, ML12086A081, ML12264A642, ML13029A497, ML13063A071, ML13198A056, ML13253A163, ML16118A311, NOC-AE-12002780, Clarification of Information in Support of the Review of the License Renewal Application, NOC-AE-13002945, Update to License Renewal Application - Environmental Permits
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MONTHYEARML1030102572010-10-25025 October 2010 Project, Units 1 & 2, Transmittal of License Renewal Application Project stage: Request ML1108720792011-04-0505 April 2011 Project Manager Change for the License Renewal of South Texas Project, Units 1 and 2 Project stage: Other ML11145A0642011-06-21021 June 2011 Plan for the Environmental Related Regulatory Audit Regarding the South Texas Project, Units 1 and 2, License Renewal Application Review (TAC Nos. ME4938 and ME4939) Project stage: Other NOC-AE-11002687, Response to Request for Additional Information for the South Texas Project License Renewal Application2011-07-0505 July 2011 Response to Request for Additional Information for the South Texas Project License Renewal Application Project stage: Response to RAI NOC-AE-11002691, Response to Request for Additional Information for the Review of the License Renewal Application2011-07-0505 July 2011 Response to Request for Additional Information for the Review of the License Renewal Application Project stage: Response to RAI ML11154A0132011-07-0606 July 2011 Summary of Telephone Conference Call Held on May 23, 2011, Between the NRC and STPNOC, Concerning Requests for Additional Information Pertaining to the South Texas Project, LRA-Future Consideration of Operating Experience Project stage: RAI ML11201A0622011-08-0404 August 2011 Request for Additional Information for the Review of the South Texas Project, License Renewal Application (TAC Nos. ME4938 and ME5122) Project stage: RAI ML11214A2072011-08-18018 August 2011 RAI for the Review of the STP, License Renewal Application (TAC No. ME4938 and ME512) Project stage: RAI ML1123000162011-08-18018 August 2011 License Renewal - Errata in AMP RAI Package Project stage: RAI NOC-AE-11002711, Response to Request for Additional Information for License Renewal Application2011-08-23023 August 2011 Response to Request for Additional Information for License Renewal Application Project stage: Response to RAI ML11256A0572011-08-31031 August 2011 Documents to Support Review of the South Texas Project License Renewal Application, List of Transmitted Documents Including Copy of Each Document, Enclosure to NOC-AE-11002720 Project stage: Other ML11256A0582011-08-31031 August 2011 Documents to Support Review of the South Texas Project License Renewal Application, WR-5, Tceq Id No. 1610103/1610051 (Operation of Public Potable Water System) Project stage: Other ML11256A0562011-08-31031 August 2011 Project, Units 1 and 2 - Transmittal of Documents to Support Review of the South Texas Project License Renewal Application Project stage: Request ML1123601142011-09-0101 September 2011 Request for Additional Information for the Review of the South Texas Project License Renewal Application Project stage: RAI NOC-AE-11002719, Response to Request for Additional Information for the License Renewal Application2011-09-0606 September 2011 Response to Request for Additional Information for the License Renewal Application Project stage: Response to RAI NOC-AE-11002734, Transmittal of Document to Support Review of the License Renewal Application2011-09-12012 September 2011 Transmittal of Document to Support Review of the License Renewal Application Project stage: Request NOC-AE-11002723, Response to Requests for Additional Information for the License Renewal Application2011-09-12012 September 2011 Response to Requests for Additional Information for the License Renewal Application Project stage: Response to RAI ML11270A0602011-09-22022 September 2011 Response to Requests for Additional Information for License Renewal Application (TAC Nos. ME4938 and ME5122) Project stage: Response to RAI ML11269A0022011-09-28028 September 2011 Requests for Additional Information for the Review of the South Texas Project License Renewal Application (TAC ME4938 and ME5122) Project stage: RAI ML11298A0852011-10-18018 October 2011 Response to Requests for Additional Information for License Renewal Application (TAC No. ME4938 and ME5122) Project stage: Response to RAI NOC-AE-11002761, Clarification to Response to Request for Additional Information for License Renewal Application (TAC No. ME4938 & ME5122)2011-11-17017 November 2011 Clarification to Response to Request for Additional Information for License Renewal Application (TAC No. ME4938 & ME5122) Project stage: Response to RAI NOC-AE-12002780, Clarification of Information in Support of the Review of the License Renewal Application2012-01-10010 January 2012 Clarification of Information in Support of the Review of the License Renewal Application Project stage: Other NOC-AE-11002773, Supplemental Response to Requests for Additional Information for the South Texas Project License Renewal Application - SAMA2012-01-19019 January 2012 Supplemental Response to Requests for Additional Information for the South Texas Project License Renewal Application - SAMA Project stage: Response to RAI ML12033A1342012-02-14014 February 2012 January 31, 2012, Summary of Telephone Conference Call Held Between the NRC and STP Nuclear Operating Company, Concerning Requests for Additional Information Pertaining to the South Texas Project License Renewal Application Project stage: RAI NOC-AE-12002795, Clarification to Supplemental Response to Request for Additional Information for the South Texas Project License Renewal Application - SAMA2012-02-16016 February 2012 Clarification to Supplemental Response to Request for Additional Information for the South Texas Project License Renewal Application - SAMA Project stage: Response to RAI ML12017A1282012-02-29029 February 2012 RAI for the Review of the STP LRA (TAC Nos. ME4938 and ME5122) Project stage: RAI ML12047A2852012-02-29029 February 2012 January 17, 2012, Summary of Telephone Conference Call Held Between the U.S. Nuclear Regulatory Commission & STP Nuclear Operating Company, Concerning Requests for Additional Information Pertaining to the South Texas Project License Renewal Project stage: RAI NOC-AE-12002818, Response to Requests for Additional Information for the Review of the South Texas Project License Renewal Application2012-03-12012 March 2012 Response to Requests for Additional Information for the Review of the South Texas Project License Renewal Application Project stage: Response to RAI ML11290A2262012-03-19019 March 2012 Revision of Schedule for the Conduct of Environmental Review of the South Texas Project License Renewal Application Project stage: Approval NOC-AE-12002840, Renewal of the Wastewater Discharge Permit2012-04-17017 April 2012 Renewal of the Wastewater Discharge Permit Project stage: Request ML12128A0612012-05-0404 May 2012 NRR E-mail Capture - NEPA Consultation - Waterborne Outbreak Project stage: Request ML12142A0022012-05-18018 May 2012 NRR E-mail Capture - Environmental Permit Updated Status Project stage: Request ML12144A4432012-06-25025 June 2012 Request for Additional Information for the Review of the South Texas Project, Units 1 and 2, License Renewal Application- Aging Management, Set 20 TAC Nos. ME4939 and ME4937) STP-RAIs-Set 20-RAI Project stage: RAI ML12171A4832012-08-10010 August 2012 Revision of Schedule for the Conduct of Environmental Review of the South Texas Project License Renewal Application (TAC Nos. ME5122, ME5123, ME4938, and ME4939) Project stage: Approval ML11153A0822012-11-14014 November 2012 Issuance of Environmental Scoping Summary Report Associated with the Staff'S Review of the Application by STP Nuclear Operating Company for Renewal of the Operating License for South Texas Project, Units 1 and 2 Project stage: Approval ML12086A0812012-11-14014 November 2012 Environmental Impact Statement Scoping Process Summary Report for South Texas Project, Units 1 and 2 Project stage: Other ML12264A6422012-11-14014 November 2012 STP Scoping Report_Paula Cooper Project stage: Other ML12324A0492012-11-30030 November 2012 NUREG-1437 Supp 48 Dfc Generic Environmental Impact Statement for License Renewal of Nuclear Plants: Regarding South Texas Project, Units 1 and 2 (Draft for Comment) Project stage: Draft Other ML12339A2652012-12-0505 December 2012 Notice of Availability of the Draft Plant-Specific Supplement 48 to the GEIS for License Renewal of Nuclear Plants Regarding South Texas Project, Units 1 and 2, (TAC ME5122, ME5123, ME4938, and ME4939) Project stage: Draft Other ML12195A0852012-12-0505 December 2012 Notice of Availability of the Draft Plant-Specific Supplement 48 to the GEIS for License Renewal of Nuclear Plants Regarding South Texas Project, Units 1 and 2, (TAC Nos. ME5122, ME5123, ME4938, and ME4939) Project stage: Draft Other ML13029A4972013-01-15015 January 2013 Slides - Preliminary Site-Specific Results of the Environmental Review for South Texas Project License Renewal Project stage: Other ML13029A7552013-01-15015 January 2013 Transcript of South Texas Project License Renewal Public Meeting: Afternoon Session, January 15, 2013, Pages 1-34 Project stage: Meeting NOC-AE-13002945, Update to License Renewal Application - Environmental Permits2013-01-21021 January 2013 Update to License Renewal Application - Environmental Permits Project stage: Other ML13011A1312013-02-11011 February 2013 Revision of Schedule for the Conduct of Environmental Review of the South Texas Project License Renewal Application (TAC Nos. ME5122, ME5123, ME4938, and ME939) Project stage: Approval ML13023A3342013-02-25025 February 2013 1/15/2013 Summary of Public Meetings Conducted to Discuss Draft Supplemental Environmental Impact Statement Related to Review of South Texas Project, Units 1 & 2, License Renewal Application ML13063A0712013-03-0101 March 2013 Efh Consultation W/ NRC for South Texas Nuclear Plant License Renewal Project stage: Other NOC-AE-13002969, Response to Requests for Additional Information for Review of License Renewal Application Concerning Wildlife Management (TAC Nos. ME5122 and ME5123)2013-03-0606 March 2013 Response to Requests for Additional Information for Review of License Renewal Application Concerning Wildlife Management (TAC Nos. ME5122 and ME5123) Project stage: Response to RAI ML13077A1172013-03-14014 March 2013 NRR E-mail Capture - South Texas NRC Informal Consultation Project stage: Request NOC-AE-13002999, Annual Environmental Operating Report, Chapter 5 Through End2013-04-30030 April 2013 Annual Environmental Operating Report, Chapter 5 Through End Project stage: Request NOC-AE-13003000, Radioactive Effluent Release Report2013-04-30030 April 2013 Radioactive Effluent Release Report Project stage: Request 2012-11-30
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Category:Letter
MONTHYEARNOC-AE-240040, Inservice Inspection Summary Report - 2RE232024-09-0404 September 2024 Inservice Inspection Summary Report - 2RE23 IR 05000498/20243012024-08-27027 August 2024 NRC Initial Operator Licensing Examination Approval 05000498/2024301; 05000499/2024301 IR 05000498/20240052024-08-22022 August 2024 Updated Inspection Plan for South Texas Project Electric Generating Station, Units 1 and 2 (Report 05000498/2024005 and 05000499/2024005) IR 05000498/20240022024-08-0909 August 2024 Integrated Inspection Report 05000498/2024002 and 05000499/2024002 IR 05000498/20240102024-08-0808 August 2024 Biennial Problem Identification and Resolution Inspection Report 05000498/2024010 and 05000499/2024010 ML24218A1462024-07-26026 July 2024 2. EPA Comments on South Texas Project Exemption Ea/Fonsi ML24207A1782024-07-25025 July 2024 Licensed Operator Positive Fitness-For-Duty Test IR 05000498/20244042024-06-0303 June 2024 Cyber Security Inspection Report 05000498/2024404 (Cover Letter) ML24141A0482024-05-17017 May 2024 EN 56958_1 Ametek Solidstate Controls, Inc ML24136A2842024-05-15015 May 2024 Independent Spent Fuel Storage Installation Supplement to Request for Exemption from Various Part 72 Regulations Resulting from Fuel Basket Design Control Compliance ML24136A2872024-05-15015 May 2024 Submittal of 2024 Nrc/Fema Evaluated Exercise Scenario Manual NOC-AE-240040, Operator Licensinq Examination Schedule Revision 32024-05-15015 May 2024 Operator Licensinq Examination Schedule Revision 3 ML24128A1572024-05-0707 May 2024 Independent Spent Fuel Storage Installation Request for Exemption from Various Part 72 Regulations Resulting from Fuel Basket Design Control Compliance IR 05000498/20240012024-05-0606 May 2024 Integrated Inspection Report 05000498/2024001 & 05000499/2024001 NOC-AE-240040, Annual Dose Report for 20232024-04-29029 April 2024 Annual Dose Report for 2023 ML24116A3032024-04-25025 April 2024 Operations Quality Assurance Plan Condition Adverse to Quality Definition Change Resulting in a Reduction in Commitment ML24116A2282024-04-25025 April 2024 Annual Environmental Operating Report ML24117A1602024-04-24024 April 2024 2023 Radioactive Effluent Release Report ML24102A2452024-04-23023 April 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0046 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML24113A3122024-04-22022 April 2024 Cycle 24 Core Operating Limits Report NOC-AE-240040, Financial Assurance for Decommissioning - 2024 Update2024-03-28028 March 2024 Financial Assurance for Decommissioning - 2024 Update ML24081A3972024-03-21021 March 2024 Response to Request for Additional Information for Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML24080A2902024-03-19019 March 2024 Nuclear Liability Certificates of Insurance ML24079A1312024-03-0505 March 2024 Nuclear Insurance Protection ML24060A1742024-02-28028 February 2024 Submittal of Annual Fitness for Duty Performance Report for 2023 IR 05000498/20230062024-02-28028 February 2024 Annual Assessment Letter for South Texas Project Electric Generating Station, Units 1 and 2 (Report 05000498/2023006 and 05000499/2023006) IR 05000498/20240132024-02-27027 February 2024 Design Basis Assurance Inspection (Programs) Commercial Grade Dedication IR 05000498/2024013 and 05000499/2024013 ML24050A0082024-02-19019 February 2024 Evidence of Financial Protection ML24045A0922024-02-16016 February 2024 Response to STP FOF Move Letter (2024) NOC-AE-240040, Unit L & 2, Supplement to Modify the Implementation Date for License Amendment Request to Revise Alternate Source Term Dose Calculation2024-02-0808 February 2024 Unit L & 2, Supplement to Modify the Implementation Date for License Amendment Request to Revise Alternate Source Term Dose Calculation ML24039A1112024-02-0808 February 2024 Operator Licensing Examination Schedule Revision 2 ML24033A3002024-02-0707 February 2024 Summary of Regulatory Audit Regarding a Proposed Alternative to ASME Code, Section XI Requirements for Containment Building Inspections ML24038A3342024-02-0707 February 2024 Change to South Texas Project Electric Generating Station (Stepgs) Emergency Plan IR 05000498/20230042024-01-29029 January 2024 Integrated Inspection Report 05000498/2023004 and 05000499/2023004 ML24029A2752024-01-29029 January 2024 Request to Reschedule Evaluated Force-on-Force Drill ML24024A1162024-01-24024 January 2024 STP Unit 2 Request for Information IR 05000498/20230032023-12-28028 December 2023 Acknowledgment of Reply to a Notice of Violation (NRC Inspection Report 05000498/2023003 and 05000499/2023003) ML23360A1692023-12-26026 December 2023 FEMA, Submittal of Radiological Emergency Preparedness Final Report for the South Texas Project Medical Services Drill Evaluated on August 31, 2023 NOC-AE-230040, Supplement to Proposed Alternate Frequency to Containment Unbonded Post-Tensioning System Inservice Inspection (Relief Request RR-ENG-4-06)2023-12-14014 December 2023 Supplement to Proposed Alternate Frequency to Containment Unbonded Post-Tensioning System Inservice Inspection (Relief Request RR-ENG-4-06) NOC-AE-230039, Docket Nos. Stn 50-498, Stn 50-499 - Reply to a Notice of Violation, NRC Inspection Report 05000498/2023003 and 05000499/20230032023-12-12012 December 2023 Docket Nos. Stn 50-498, Stn 50-499 - Reply to a Notice of Violation, NRC Inspection Report 05000498/2023003 and 05000499/2023003 ML23326A2592023-12-0505 December 2023 Review of the Fall 2022 Steam Generator Tube Inspection Report ML23339A1902023-12-0505 December 2023 Update Foreign Ownership, Control, or Influence (FOCI) IR 05000498/20234012023-12-0404 December 2023 Security Baseline Inspection Report 05000498/2023401 and 05000499/2023401 ML23324A0102023-11-16016 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23310A2282023-11-13013 November 2023 Integrated Inspection Report 05000498/2023003 and 05000499/2023003, and Notice of Violation ML23311A2082023-11-0909 November 2023 Reassignment of U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch IV ML23298A0002023-11-0101 November 2023 the Associated Independent Spent Fuel Storage Installation - Issuance of Amendment Nos. 226 and 211 Related to Order Approving Indirect Transfer of Licenses and Conforming License Amendments ML23303A0782023-10-30030 October 2023 Submittal of Supplemental Information in Response to Order Consenting to License Transfers and Approval of Draft Conforming License Amendments ML23279A0342023-10-30030 October 2023 Associated Independent Spent Fuel Storage Installation - Order Approving Indirect Transfer of Licenses and Draft Conforming License Amendments (EPID L-2023-LLM-0004) (Letter) IR 05000498/20234032023-10-26026 October 2023 Material Control and Accounting Program Inspection Report 05000498/2023403 and 05000499/2023403 (Cover Letter) 2024-09-04
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ALM/'/AM Nuclear Operating Company South Texas Project Electric GeneratinS Station PO. Bae 289 Wadsworth, Texas 77483 _/_/_ _--September 22, 2011 NOC-AE-1 1002735 10CFR54 STI: 32945070 File: G25 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2746 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Response to Requests for Additional Information for the South Texas Proiect License Renewal Application (TAC Nos. ME4938 and ME5122)
References:
- 1. STPNOC Letter dated October 25, 2010, from G. T. Powell to NRC Document Control Desk, "License Renewal Application" (NOC-AE-10002607) (ML103010257)
- 2. NRC letter dated September 1, 2011, "Requests for Additional Information for the Review of the South Texas Project, License Renewal Application" (ML1 12360114)By Reference 1, STP Nuclear Operating Company (STPNOC) submitted a License Renewal Application (LRA) for South Texas Project (STP) Units 1 and 2. By Reference 2, the NRC staff requests additional information for review of the STP LRA. STPNOC's response to the request for additional information is provided in the Enclosure to this letter.There are no regulatory commitments in this letter.Should you have any questions regarding this letter, please contact either Arden Aldridge, STP License Renewal Project Lead, at (361) 972-8243 or Ken Taplett, STP License Renewal Project regulatory point-of-contact, at (361) 972-8416.I declare under penalty of perjury that the foregoing is true and correct.Executed on , e 'al Date G. T. Powell Vice President, Technical Support & Oversight KJT
Enclosure:
STPNOC Response to Requests for Additional Information NOC-AE-1 1002735 Page 2 cc: (paper copy)(electronic copy)Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 612 East Lamar Blvd, Suite 400 Arlington, Texas 76011-4125 Balwant K. Singal Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (MS 8B1)11555 Rockville Pike Rockville, MD 20852 Senior Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MN1 16 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 John W. Daily License Renewal Project Manager (Safety)U.S. Nuclear Regulatory Commission One White Flint North (MS 011-Fl)Washington, DC 20555-0001 Tam Tran License Renewal Project Manager (Environmental)
U. S. Nuclear Regulatory Commission One White Flint North (MS O11F01)Washington, DC 20555-0001 A. H. Gutterman, Esquire Kathryn M. Sutton, Esquire Morgan, Lewis & Bockius, LLP John Ragan Catherine Callaway Jim von Suskil NRG South Texas LP Ed Alarcon Kevin Polio Richard Pena City Public Service Peter Nemeth Crain Caton & James, P.C.C. Mele City of Austin Richard A. Ratliff Alice Rogers Texas Department of State Health Services Balwant K. Singal John W. Daily Tam Tran U. S. Nuclear Regulatory Commission Enclosure NOC-AE-1 1002735 Page 1 of 2 STPNOC Response to Requests for Additional Information SOUTH TEXAS PROJECT LICENSE RENEWAL APPLICATION REQUESTS FOR ADDITIONAL INFORMATION REGARDING THE ANALYSIS OF SEVERE ACCIDENT MITIGATION ALTERNATIVES The requests for information (RAIs) listed below were derived from the discussion during the conference call of July 28, 2011 (ML1 1216A263).
The purpose for the call was to seek additional clarification for the RAI responses of July 5, 2011 (ML11193A016).
NRC RAI 3.b: Fire-analysis Individual plant examination (IPE) -use of technical report NUREGICR-6850
Background:
The response to this RAI simply indicates that a review of the NUREG/CR-6850 will be performed in the future. However, the recent research and guidance reported in NUREG/CR-6850, specifically in the areas of hot short probabilities, fire ignition frequencies, and non-suppression probabilities, indicate that the fire analysis methodologies utilized for the IPE may underestimate fire risk.Requested information:
Provide assurance that consideration of this new information is not expected to impact the selection of cost beneficial severe accident mitigation alternatives (SAMAs) for South Texas Project (STP).STPNOC Response: STPNOC will perform an assessment using the new information provided in NUREG/CR-6850,"EPRI/NRC-RES Fire PRA Methodology for Nuclear Power Facilities," for assessing impact on the selection of cost beneficial severe accident mitigation alternatives (SAMAs) for the South Texas Project (STP). The assessment will consider insights provided in NUREG/CR-6850 regarding hot short probabilities, fire ignition frequencies, and non-suppression probabilities.
The STP Fire Probabilistic Risk Analysis (PRA) model will not be revised as a result of this study.The insights from NUREG/CR-6850 will be applied to the fire analyses from the IPE and as augmented through the STPREV 6 version of the PRA model. The insights from NUREG/CR-6850 will be applied to the fire scenarios currently in the PRA model. The resultant core damage frequency (CDF) from the assessment will be used to screen the list of SAMAs currently considered in the LRA to re-evaluate if any SAMA would be cost-beneficial.
STPNOC expects to complete the assessment and report the results to the NRC by December 15, 2011.
Enclosure NOC-AE-1 1002735 Page 2 of 2 NRC RAI 3.c: Seismic-analysis IPE of external events (IPEEE) -use of Lawrence Livermore National Laboratory (LLNL) or United States Geological Survey (USGS) hazard curves
Background:
The response to this RAI did not provide the requested updated seismic core damage frequency (CDF) results. Instead, the applicant cited Notice IN 2010-18. While this Information Notice concluded that the US plants had adequate safety margin, it did indicate that the seismic CDF for STP could be as high as 3E-06 per year (for spectral accelerations of 5 hz and 10 hz). This is 40 times the total seismic CDF given in the environmental report (ER). Also, note that the STP IPE gives a seismic CDF using the LLNL hazard curve of 1.7E-05 per year which is over 200 times the value used in the probabilistic risk assessment (PRA). Since the seismic CDF was determined using point estimates, the seismic CDF for the analysis STPREV6, based on the LLNL hazard curve, can be obtained from the LLNL seismic frequencies from Table 3.4.4-9 of the IPE or IPEEE or both and the conditional core damage probabilities (CCDPs) from Table F.2-1 of the ER. The result is a seismic core damage frequency (SCDF) of 8.7E-06 per year.Comparing the USGS hazard curves for the STP site with the Electric Power Research Institute (EPRI) hazard curves indicates that the frequency for the USGS curves is 60 to 150 times those for the EPRI curves over the range of 0.4 to 0.6 g which is the range for the largest contributors to STP seismic CDF. Furthermore, the USGS hazard curve is higher than the LLNL hazard curve by a factor of 1.5 to 2 over the same range.Using the above method for determining the CDF for SEIS3 and SEIS4 initiators for the seismic event scenarios gives seismic CDFs of 4E-06 and 5E-06 per year, respectively.
This indicates that applying the LLNL hazard curves or the 2008 USGS hazard curves to the SEIS3 and SEIS4 initiators could lead to CDF contributions of about 60 to 150% of the STPREV6 total CDF.Requested information:
Provide an assessment of the seismic CDF contribution due to the updated USGS hazard curves and the potential for cost beneficial SAMAs.STPNOC Response: STPNOC will perform an assessment of the seismic CDF contribution due to the updated USGS hazard curves for impact on the selection of cost beneficial SAMAs for STP. The STP PRA model will not be revised as a result of this assessment.
The acceleration values from the USGS hazard curves will be applied to the current STP PRA model and will examine the impact on those key components previously identified in the current STP PRA model. Because the fragilities for many of these key components were conservative, revised fragilities may be assumed, if necessary and where justified, to determine the resultant CDF. The resultant CDF from the assessment will be used to screen the list of SAMAs currently considered in the LRA to re-evaluate if any SAMA would be cost-beneficial.
STPNOC expects to complete the assessment and report the results to the NRC by December 15, 2011.