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Administration
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Results
Other: ML111640211, ML111861529, ML111890408, ML111890413, ML112130165, ML112350873, ML112350883, ML112630673, ML112630676, ML112770237, ML112770246, ML112770251, ML113050623, ML113060606, ML113060615, ML113060623, ML113210411, ML113330116
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MONTHYEARML1104105052011-02-10010 February 2011 2/22/11 Notice of Forthcoming Public Meeting with STP Nuclear Operating Co., Units 1 & 2, to Discuss Risk-informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor Sump Performance, Resolution Option Approach Project stage: Meeting ML1107700052011-04-0505 April 2011 Summary of Meeting with STP Nuclear Operating Company to Discuss a Risk-informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Option Approach for South Texas, Units 1 and 2 Project stage: Meeting ML1113302442011-05-16016 May 2011 Notice of Meeting with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 Project stage: Meeting ML1114706522011-05-16016 May 2011 Correction 06/02/2011 Notice of Meeting with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 Project stage: Meeting ML11157A0102011-06-0202 June 2011 STP Nuclear Operating Company, Licensee Handouts, 6/2/2011 Meeting Risk-Informed GSI-191 Closure Plan for GSI-191 Resolution Project stage: Meeting ML1116401602011-06-21021 June 2011 Summary of Meeting with STP Nuclear Operating Company Regarding Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance; Resolution Approach for South Texas, Units 1 and 2 (TAC ME5358-ME5 Project stage: Meeting ML1116402112011-06-24024 June 2011 Notice of Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 & 2 Project stage: Other ML1118903912011-07-0606 July 2011 Email Additional Materials for Teleconference on 7/7/11 with STP to Discuss Risk Informed GSI-191 Project stage: Meeting ML1118904082011-07-0606 July 2011 Licensee Handout Loca Frequencie Approach and Example Application Project stage: Other ML1118904132011-07-0606 July 2011 Licensee Slide Regarding Questions on LOCA Frequency Analysis and Responses to Comments Project stage: Other ML1118904202011-07-0606 July 2011 Licensee Slide from 7/7/11 Meeting with STP Nuclear Project stage: Meeting ML1118903762011-07-0707 July 2011 Email Licensee Slides for 7/7/11 Teleconference with STP to Discuss Risk Informed GSI-191 Project stage: Meeting ML1118903802011-07-0707 July 2011 Licensee Slides, LOCA Initiating Event Frequencies and Uncertainties(Draft) Project stage: Draft Other ML1118615292011-07-12012 July 2011 Notice of Conference Call with STP Nuclear Operating Company to Discuss Risk-informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 Project stage: Other ML1120707292011-07-26026 July 2011 Meeting Notice with South Texas Project, Units 1 and 2 - Licensee Slides Computational Fluid Dynamics Validation Plan Project stage: Meeting ML1120707072011-07-26026 July 2011 Meeting Notice with South Texas Project, Units 1 and 2 - Licensee Slide Models and Methods Used for Casa Grande Project stage: Meeting ML1121301822011-08-0202 August 2011 Meeting Notice with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 (TAC ME5358-ME5359 Project stage: Meeting ML1119500942011-08-0404 August 2011 Summary of Meeting with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 Project stage: Meeting ML1121301652011-08-19019 August 2011 7/26/11 - Summary of Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 an Project stage: Other ML1123508732011-08-22022 August 2011 Models and Methods Used for Casa Grande Project stage: Other ML1123508832011-08-22022 August 2011 LOCA Initiating Event Frequencies and Uncertainties Status Report Project stage: Other ML1125101482011-09-15015 September 2011 Notice of Meeting by Conference Call with STP Nuclear Operating Co. to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 Project stage: Meeting ML1126306732011-09-20020 September 2011 Email, NRC Staff Questions, Loss-of-Coolant Accident Frequency Analysis, Resolution Approach for Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance. Project stage: Other ML1126306762011-09-20020 September 2011 NRC Staff Questions, Loss-of-Coolant Accident Frequency Analysis, Resolution Approach for Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance. Project stage: Other ML1127702372011-09-30030 September 2011 LOCA Frequencies for STP GSI-191( Final) Project stage: Other ML1127701702011-10-0303 October 2011 E-mail Licensee Handouts for 10/3/11 Public Meeting Project stage: Meeting ML1127701762011-10-0303 October 2011 Licensee Handouts from 10/3/11 Meeting STP LOCA Frequency Project stage: Meeting ML1127702032011-10-0303 October 2011 Licensee Slides from 10/3/11 Meeting LOCA Frequencies, Final Results Project stage: Meeting ML1127702302011-10-0303 October 2011 E-mail Documents for 10/3/11 Teleconference Project stage: Meeting ML1127702462011-10-0303 October 2011 E-mail Questions Associated with LOCA Frequency Analysis Project stage: Other ML1127702512011-10-0303 October 2011 STP Responses to Questions Associated with LOCA Frequency Analysis Project stage: Other ML1124114192011-10-0404 October 2011 8/22/11 Summary of Meeting with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 (TAC M Project stage: Meeting ML1127901512011-10-11011 October 2011 Notice of Meeting by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 & Project stage: Meeting ML1127900992011-10-11011 October 2011 Notice of Meeting by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 an Project stage: Meeting ML1130606232011-10-20020 October 2011 Technical Review of STP LOCA Frequency Estimation Methodology Project stage: Other ML1130506322011-10-26026 October 2011 Licensee Handouts from November 1, 2011 Meeting with STP Nuclear Operating Company on GSI-191 Project stage: Meeting ML1130506232011-10-26026 October 2011 Alion- Expected Impact of Chemical Effects on GSI-191 Risk Informed Evaluation for South Texas Project Project stage: Other ML1130606152011-10-31031 October 2011 LOCA Frequencies for STP Nuclear Operating Company GSI-191 Project stage: Other ML1128401142011-10-31031 October 2011 10/3/11 Summary of Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas Project stage: Meeting ML1129701092011-11-0101 November 2011 Notice of Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor Sump Performance, Resolution Approach for South Texas, Units 1 & 2 Project stage: Meeting ML1132104112011-11-0101 November 2011 Revised Notice of by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Project stage: Other ML1130606062011-11-0202 November 2011 Questions Associated with Loss-of-Coolant Accident (LOCA) Frequency Analysis Project stage: Other ML1133301162011-11-29029 November 2011 Email, 11/1/2011 Pre-Licensing Conference Call to Discuss the Topic of Expected Impact of Chemical Effects on GSI-191 Risk-Informed Evaluation, Phenomena Identification and Ranking Table Items (TAC ME5358-ME5359) Project stage: Other ML1131201292011-11-29029 November 2011 Summary of 11/1/11 Meeting by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance,Resolution Approach for South Texas, Un Project stage: Meeting ML1133505632011-12-0101 December 2011 Licensee Presentation from 12/1/11 Meeting Via Conference Call to Discuss Risk-Informed GSI-191,Assessment of Debris Accumulation on Pressurized Water Reactor Sump Performance Project stage: Meeting ML1131801962011-12-0505 December 2011 Summary of Meeting with STP Nuclear Operating Company Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas Units 1 and 2 Project stage: Meeting ML1134300872011-12-23023 December 2011 Summary of 12/1/11 Meeting by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas Un Project stage: Meeting 2011-05-16
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Category:Meeting Summary
MONTHYEARML22252A0432022-09-12012 September 2022 Summary of August 31, 2022, Webinar with STP Nuclear Operating Company to Discuss a Proposed LAR to Revise the Dose Consequence Analysis for Main Steam Line Break and Locked Rotor Analysis Events for STP, Units 1 & 2 ML22147A0932022-06-0606 June 2022 2021 Annual Assessment Public Meeting Summary ML21236A3082021-09-10010 September 2021 Regulatory Audit Summary Regarding License Amendment Request to Revise Moderator Temperature Coefficient Surveillance Requirements ML21222A1192021-08-12012 August 2021 Summary of Meeting with STP Nuclear Operating Company Regarding the License Amendment Request to Revise the Moderator Temperature Coefficient Surveillance Requirements for South Texas Project, Units 1 and 2 ML21140A3892021-05-24024 May 2021 Riv Column 1 EOC 2020 Public Meeting Summary ML20279A8152020-10-20020 October 2020 Summary of September 14, 2020, Presubmittal Teleconference with STP Nuclear Operating Company Regarding the Proposed LAR to Revise the Moderator Temperature Coefficient Surveillance Requirement for South Texas Project, Units 1 and 2 (EPID L ML20189A2832020-07-0707 July 2020 Summary of Region IV Annual Assessment Public Meeting ML20163A5522020-06-12012 June 2020 Summary of April 21, 2020, Teleconference with STP Nuclear Operating Company to Discuss the License Amendment Request to Revise the Emergency Plan for South Texas Project, Units 1 and 2 ML20140A2612020-05-27027 May 2020 May 5, 2020, Summary of Teleconference with STP Nuclear Operating Company to Discuss a Proposed Exigent License Amendment Request to Revise the Pressure of the Safety Injection Accumulators for South Texas Project, Unit 1 ML20107J5482020-04-15015 April 2020 Teleconference Regarding NRC Observations on the March 30, 2020, License Amendment Request to Revise the Emergency Plan STP Nuclear Operation Company South Texas Project, Units 1 and 2, Dockets 50-498 and 50-499 ML20049A0572020-02-26026 February 2020 Summary of February 6, 2020, Meeting with STP Nuclear Operating Company to Discuss a Proposed License Amendment Request to Revise the Emergency Plan for South Texas Project, Units 1 and 2 (EPID L- 2020-LRM-0004) ML19350C5902019-12-17017 December 2019 12/3/19, Summary of Teleconference with STP Nuclear Operating Company to Discuss a Proposed License Amendment Request to Revise the Emergency Plan for South Texas Project, Units 1 and 2, ML19102A0162019-04-16016 April 2019 4/10/2019 Summary of Public Teleconference Regarding Potential Submission of a Relief Request to Allow Use of Carbon Fiber Reinforced Polymer for Selected Piping Repairs at South Texas, Units 1 and 2 ML17005A1002017-01-18018 January 2017 January 4, 2017, Summary of Meeting to Discussion Stp'S Response to Request for Additional Information the Revised Aluminum Bronze Selective Leaching Aging Management Program for All Potentially Susceptible Welds Throughout the Facility ML16279A3312016-10-27027 October 2016 Summary of Public Meeting with STP Nuclear Operating Company Regarding Open Items, Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 (CAC Nos. MF2400-MF2409) ML16272A4362016-10-14014 October 2016 Summary of Public Preapplication Meeting with STP Nuclear Operating Company to Discuss Possible License Amendment Request to Modify Emergency Response Organization for South Texas Project, Units 1 and 2 ML16246A0222016-10-0505 October 2016 Summary of Public Meeting with STP Nuclear Operating Company Regarding Open Items Related to Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 (CAC Nos. MF2400 - MF2409) ML16238A5272016-09-0101 September 2016 Summary of 7/28/16, Public Meeting with STP Nuclear Operating Company to Discuss the License Amendment and Exemption Requests to Use a Risk-Informed Approach to the Resolution of GSI-191 (CAC Nos. MF2400 - MF2409) ML16218A3672016-08-30030 August 2016 07/21/2016 Summary of Public Teleconference Meeting with STP Nuclear Operating Company Discussing Revisions to License Renewal Application Aluminum Bronze Selective Leaching Aging Management Program and Background Document ML16236A0322016-08-23023 August 2016 08/18/2016 Summary of Conference Call With STP Nuclear Operating Company Concerning the Aluminum Bronze Selective Leaching Aging Management Program in the South Texas Project, License Renewal Application ML16236A3042016-08-23023 August 2016 08/11/2016 Summary of Conference Call Between NRC and STP Nuclear Operating Company Concerning the 2016 Annual Update to the South Texas Project License Renewal Application ML16180A0142016-07-25025 July 2016 Summary of Meeting Discussion Between South Texas Project, Units 1 and 2, and NRC Staff Regarding the Revised Aluminum Bronze Selective Leaching Aging Management Program for All Potentially Susceptible Welds Throughout the Facility ML16190A0082016-07-13013 July 2016 Summary of 6/22/2016 Public Meeting with STP Nuclear Operating Company Regarding Open Items, Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 (CAC Nos. MF2400-MF2409) ML16188A0072016-07-0707 July 2016 Summary of Telecon Held on July 5, 2016 With STP Nuclear Operating Company, Concerning Additional Information Pertaining to the STP, License Renewal Application (TAC. Nos. ME4936, ME4937) ML16188A0112016-07-0707 July 2016 Summary of Telecon Held on July 5, 2016 With STP Nuclear Operating Company, Concerning Additional Information Pertaining to the STP, License Renewal Application (TAC Nos. ME4936, ME4937) ML16188A0092016-07-0707 July 2016 Summary of Telecon Held on July 5, 2016 with STP Nuclear Operating Company, Concerning Additional Information Pertaining to the STP, License Renewal Application (Tac. Nos. ME4936, ME4937) - Enclosure 1 ML16175A1082016-06-24024 June 2016 Summary of 4/21/2016 Public Meeting with STP Nuclear Operating Company Regarding Open Items, Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 ML16166A0272016-06-14014 June 2016 Summary of Telephone Conference Call Held on 06/08/2016, Between the USNRC and STP Nuclear Operating Company Response to Request for Additional Information B2.1.18-6 Pertaining to the South Texas Project License Renewal Application ML16092A0852016-04-13013 April 2016 3/17/2016 Summary of Public Meeting with STP Nuclear Operating Company Regarding Open Items, Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 (CAC Nos. MF2401-MF2409) ML16092A0442016-04-11011 April 2016 Summary of 3/3/2016 Public Meeting with STP Nuclear Operating Company Regarding Open Items, Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 (CAC Nos. MF2400-MF2409) ML16088A2432016-04-0101 April 2016 2/18/2016, Summary of Public Meeting with STP Nuclear Operating Company Regarding Open Items, Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 (CAC Nos. MF2400-MF2409) ML16081A2052016-03-24024 March 2016 Summary of Meeting with STP Nuclear Operating Company to Discuss Potential License Amendment Request for South Texas Project, Unit 1 Regarding Permanent Operation with 56 Control Rods ML16074A0412016-03-14014 March 2016 Summary of a Call Held on March 10, 2016, between USNRC and STPNOC, Concerning the Staff's Upcoming Audit Regarding the Amp for the Loss Of Material Due to Selective of Al-Br Welds in the ECW System for the STP LRA (TAC Nos. ME4936 And ME4937) ML16060A1272016-03-0707 March 2016 February 23, 2016, Summary of Conference Calls Held between NRC and STP Concerning Staff's Review of Submerged Closure Bolting Portion of 2014 Annual Update for STP License Renewal Application (TAC ME4936 And ME4937) ML16028A1522016-02-18018 February 2016 1/14/2016 Summary of Public Meeting with STP Nuclear Operating Company Regarding Modifications to the Licensee'S Risk-Informed Generic Safety Issue (GSI) 191 Application and Supplements for South Texas Project, Units 1 and 2 ML16035A4802016-02-12012 February 2016 Jsc Meeting Summary Attachment ML16011A0612016-02-0202 February 2016 Summary of 10/1/15 Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas Project, Units 1 and 2 (CAC MF ML16011A0702016-01-28028 January 2016 Summary of Preapplication Meeting with STP Nuclear Operating Company to Discuss Exigent License Amendment Request to Operate Following Removal of a D6 Control Rod at South Texas Project, Unit 1 ML16033A0072016-01-19019 January 2016 January 19, 2016, Summary of Public Meeting with STP to Discuss the Plant-Specific Aging Management Program, Selective Leaching of Aluminum Bronze, Associated with STP's License Renewal Application ML16013A0662016-01-14014 January 2016 Summary of 11/9 and 12/30/15 Conference Calls with STP Nuclear Operating Company to Discuss the Fall 2015 Steam Generator Tube Inspection Activities (CAC No. A11018) ML15308A0112015-11-30030 November 2015 Record of Conference Call on STP Request for Additional Information Set 34 ML15201A0032015-07-30030 July 2015 7/2/15 Summary of Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas, Units 1 and 2 ML15177A1042015-07-21021 July 2015 4/22/2015 Summary of Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas, Units 1 and 2 (TAC MF2400 t ML15177A2742015-07-21021 July 2015 5/6/2015 Summary of Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas, Units 1 and 2 (TAC Nos. MF24 ML15180A2732015-07-15015 July 2015 6/3/2015 Summary of Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas, Units 1 and 2 (TAC MF2400 to ML15139A3442015-06-11011 June 2015 Summary of Telephone Conference Call Held on May 12, 2015 Between the U.S. Nuclear Regulatory Commission and STP Nuclear Operating Company, Concerning Request for Additional Information, Set 31, Pertaining to the South Texas Project, Licens ML15103A0022015-05-13013 May 2015 Summary of 4/8/15 Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas, Units 1 and 2 ML15084A0032015-04-0606 April 2015 2/4/15 Summary of Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas, Units 1 and 2 (TAC MF2400-MF24 ML15084A0042015-04-0101 April 2015 2/5/2015 Summary of Presubmittal Meeting with STP Nuclear Operating Company to Discuss Integrated Leak Rate Testing Program License Amendment Request for South Texas, Units 1 and 2 ML15020A1062015-02-19019 February 2015 12/1-3/2014 Summary of Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas, Unit 1 and 2 (TAC MF2400- 2022-09-12
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Text
~"I\ IIEG,,~ UNITED STATES
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';'1-') .l' October 31,2011
LICENSEE: STP Nuclear Operating Company FACILITY: South Texas Project, Units 1 and 2
SUBJECT:
SUMMARY
OF OCTOBER 3,2011, PRE-LICENSING PUBLIC MEETING WITH STP NUCLEAR OPERATING COMPANY HELD VIA CONFERENCE CALL TO DISCUSS THE PROPOSED RISK*INFORMED APPROACH TO THE RESOLUTION OF GSI-191, "ASSESSMENT OF DEBRIS ACCUMULATION ON PWR SUMP PERFORMANCE" (TAC NOS. ME5358 AND ME5359)
On October 3, 2011, a public meeting was held via conference call between the U.S. Nuclear Regulatory Commission (NRC), and representatives of STP Nuclear Operating Company (STPNOC, the licensee), at NRC Headquarters, Rockville, MD. The meeting notice and agenda, dated September 15, 2011, is located in the Agencywide Documents Access and Management System (ADAMS) under Accession No. ML112510148. The purpose of the meeting was to discuss the proposed risk-informed approach to the resolution of Generic Safety Issue (GSI)-191, "Assessment of Debris Accumulation on PWR [Pressurized-Water Reactor]
Sump Performance." South Texas Project (STP) is the lead plant and STPNOC plans to submit a license amendment request (LAR) in mid-2012. The licensee previously provided an overview of its proposed approach during the public meetings held on June 2, July 6, July 26, and August 22, 2011 . The purpose of this conference call was to provide an overview and results of the initial Loss-of-Coolant Accident (LOCA) Initiating Event Frequencies and Uncertainties Analysis.
The licensee's presentation slides and additional materials provided for the meeting are located at ADAMS Accession No. ML112770162. A list of meeting attendees is provided in the Enclosure to this meeting summary.
Meeting Summary The licensee provided copies of the following presentations prior to the meeting:
- 1. LOCA Initiating Event Frequencies - Final Results for 2011
- 2. Technical Review of SIP LOCA Frequency Estim;3tion Methodology
- 3. Development of LOCA Initiating Event Frequencies for South Texas Project GSI-191 - Final Report for 2011 Work Scope ..
- 4. Questions Associated with LOCA Frequency Analysis 1 Summaries of the meetings held on June 2, July 7, July 26, and August 22, 2011, are available in ADAMS Accession Nos. ML111640160, ML111950094, ML112130165, and ML112411419, respectively.
-2 The presentation slides were made available to the NRC staff just prior to the meeting; therefore, the NRC staff did not have sufficient time to review the materials to be presented during the meeting. Item 3 was provided for NRC staff information as a supplement to item 1 and was not to be discussed during the meeting. The NRC staff agreed to review the information presented in item 4 for discussion in a future public meeting.
The licensee presented an overview of the topics covered by items 1 and 2 and covered the following key areas.
LOCA Initiating Event Frequencies - Final Results for 2011
- Briefing on final results for 2011
- Review of technical approach with focus on recent refinements
- Highlights of results for component level for Containment Accident Sequence Stochastic Analysis Grande (CASAGRANDE), total LOCA frequencies for RISKMAN, and comparison with NUREG-18292
- Issues to be completed in 2012 Technical Review of STP LOCA Frequency Estimation Methodology
- LOCA frequency estimation model
- Other key assumptions and computational steps used to generate the numerical results
- Discussion on results of reviews performed in August 2011 and September 2011 Results of Discussions
- Based on the previous public meetings, the NRC staff had identified several preliminary issues and concerns associated with the LOCA frequency analysis.
Some of the known preliminary issues and concerns based on limited information provided in the previous meetings were transmitted to STPNOC via e-mail dated September 20, 2011 (ADAMS Accession No. ML112630671). STPNOC's presentation during the meeting was intended to address these concerns.
STPNOC also provided its preliminary responses to the NRC staff's concerns (item 4). The NRC staff stated that it is in the process of understanding the complex analysis being used to develop location-specific LOCA frequencies that will serve as input to the model determining the debris source term and for determining total LOCA frequencies for the probabilistic risk analysis (PRA) 2 U.S. Nuclear Regulatory Commission, "Estimating Loss-of-Coolant Accident (LOCA) Frequencies Through the Elicitation Process," April 2008 (Volumes 1 and 2 at ADAMS Accession Nos. ML080630013 and ML081060300, respectively).
- 3 analysis. Since the NRC staff did not have sufficient time to review the presentation slides (items 1! 2, and 4) including the supporting materials (item 3),
it was agreed to discuss the topic in a future public meeting to be arranged early in November 2011.
- STPNOC stated that it intends to use the geometric mean methodology to aggregate the different expert elicitation estimates of LOCA frequencies of different sizes into a single frequency for each size. STPNOC provided example curves for several different LOCA sizes which compared the frequency results using the alternative mixed distribution aggregation technique compared with the results using geometric mean aggregation. The results illustrate that using the mixed aggregation instead of geometric aggregation can increase the rupture frequencies by up to two orders of magnitude. The NRC staff noted that NUREG-1829 identified the sensitivity of the results on the aggregation technique and concluded that the context of the application should be considered when determining which method was most applicable. STPNOC did not clarify whether the sensitivity studies would be carried thorough the analysis used to support its planned risk-informed submittal to provide the alternative aggregation technique estimates of the risk of sump blockage. The NRC staff stated that a sensitivity study providing the risk of sump blockage using the mixed distribution aggregation methodology should be provided as part of planned risk-informed submittal.
- STPNOC agreed to provide more information on the nine expert distributions, including which LOCA categories were covered by each expert and how this impacted the method of applying geometric means.
- STPNOC agreed to provide more information on how pipe-induced LOCA frequencies were extracted from NUREG-1829, including references to tables and figures used to generate the NUREG-1829 comparisons.
- STPNOC indicated that it will perform additional sensitivity analysis on LOCA frequencies when more information on break location sensitivity to sump failure from CASAGRANDE becomes available. This will include sensitivity to assumptions regarding possible synergy between two or more degradation mechanisms at applicable locations.
- 4 No Public Meeting Feedback Forms were received for this meeting.
Please direct any inquiries to me at (301) 415-3016, or balwant.singal@nrc.gov.
Sincerely, b~~'~as<-
Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499
Enclosure:
List of Attendees cc w/encl: Distribution via Listserv
LIST OF ATTENDEES FOR MEETING WITH STP NUCLEAR OPERATING COMPANY REGARDING RISK-INFORMED APPROACH TO RESOLUTION OF GSI-191 ISSUE SOUTH TEXAS PROJECT, UNITS 1 AND 2 OCTOBER 3, 2011 NAME TITLE ORGANIZATION I Paul Jamie* Licensing STPNOC Rick Grantom* Manager, Risk Projects STPNOC Sara Wright* Administrative Assistant STPNOC Wes Schulz* Design Engineer STPNOC Tim Sande* Principal Engineer Alion Science and Technology, Represented STPNOC Ali Mosleh* Professor Nuclear Engineering University of Maryland, Represented STPNOC Karl Fleming* Consultant KNF Consulting, Represented STPNOC
- Mike Golay* President MGI, Represented STPNOC Gil Zilger* Senior Engineer Alion Science and Technology, Represented STPNOC Bengt Lydell* -- ScandPower I Diego Soenz* General Engineer NRC I
John Tsao Materials Engineer NRC Michael Snodderly Senior Reliability and Risk Engineer NRC Balwant K. Singal Senior Project Manager NRC Robert Tregoning* NRC I Stephen Dinsmore Senior Reliability and Risk Engineer NRC Stewart Bailey Branch Chief NRC Donnie Harrison Branch Chief NRC
- Participated via phone NRC - U.S. Nuclear Regulatory Commission STPNOC - STP Nuclear Operating Company Enclosure
ML112840114 _._._. *Via E-mail I OFFICE NRR/LPL4/PM I\IRR/LPL4/LA NRR/DSS/SSIB/BC NAME BSingal JBurkhardt SBailey*
DATE 10/14/11 10/14/11 10/14/11 OFFICE NRRIDRNAPLNBC NRR/LPL4/BC NRR/LPL4/PM NAME SDinsmore(A)", MMarkley BSingal DATE 10/14/11 10/31/11 10/31/11