Letter Sequence Meeting |
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Administration
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Results
Other: ML120540570, ML120540610, ML120540667, ML120540727, ML120540816, ML120610068, ML120610074, ML120610102, ML12145A438, ML12145A466, ML12243A474, ML12335A174, ML12335A177
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MONTHYEARML1200901012012-01-10010 January 2012
Notice of Forthcoming Public Meeting Via Conference Call with South Texas Project Nuclear Operating Company
Project stage: Meeting
ML1204400602012-01-26026 January 2012
Summary of January 12, 2012 Chemical Effects Meeting
Project stage: Request
ML1203003642012-02-0202 February 2012
3/8/12 Forthcoming 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, U
Project stage: Meeting
ML1203400432012-02-0303 February 2012
Notice of Forthcoming Meeting Via Conference Call with STP Nuclear Operating Company
Project stage: Meeting
ML1204400612012-02-0808 February 2012
Email Licensee Slides for 2/9/12 Public Meeting Via Conference Call
Project stage: Meeting
ML1204400652012-02-0909 February 2012
Licensee Slides for 2/9/12 Meeting Regarding GSI-191
Project stage: Meeting
ML1205407272012-02-0909 February 2012
Actions Taken to Resolved PIRT Items
Project stage: Other
ML1205406942012-02-22022 February 2012
Email Additional Meeting Materials for the 3/01/12 Meeting to Discuss GSI- 191
Project stage: Meeting
ML1205406672012-02-22022 February 2012
Casa Grande Summary
Project stage: Other
ML1205406102012-02-22022 February 2012
Email Casa Grande Summary
Project stage: Other
ML1205405572012-02-22022 February 2012
Licensee Slides for 03/1/12 Meeting with STP Nuclear Operating Company Meeting to Discuss GSI-191
Project stage: Meeting
ML1205405092012-02-22022 February 2012
Email Meeting Materials for March 1, 2012 Conference Call
Project stage: Meeting
ML1205407582012-02-22022 February 2012
STP Summary of January Meeting
Project stage: Meeting
ML1205406042012-02-22022 February 2012
Meeting Materials for 3/1/12 Conference Call
Project stage: Meeting
ML1205405702012-02-22022 February 2012
Uncertainty Modeling of LOCA Frequencies and Break Size Distributions for the STP GSI-191 Resolution
Project stage: Other
ML1205407842012-02-23023 February 2012
Email Documents Transmitted for March 1, 2012 Meeting
Project stage: Meeting
ML1205408162012-02-23023 February 2012
Experimental Setup for Chle Test Equipment
Project stage: Other
ML1206100682012-02-28028 February 2012
Southtexas Project, Units 1 and 2 - Test Plan for STP High Temperature Vertical Loops Testing
Project stage: Other
ML1206100742012-02-29029 February 2012
Corrosion Head Loss Experiments Test Program
Project stage: Other
ML1206100632012-02-29029 February 2012
Intro for March 8, 2012 Public Meeting to Discuss GSI-191
Project stage: Meeting
ML1206101022012-02-29029 February 2012
Proposed STP Strainer Fiber Bypass Test Protocol
Project stage: Other
ML1206205412012-03-0606 March 2012
2/9/12 Summary 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, Un
Project stage: Meeting
ML1207400312012-03-15015 March 2012
3/29/12 Notice of Meeting Viaconference 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 Units 1 and 2
Project stage: Meeting
ML1208300862012-03-29029 March 2012
Summary 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 & 2
Project stage: Meeting
ML1208301032012-03-30030 March 2012
3/1/12 Summary 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, Un
Project stage: Meeting
ML1210800062012-05-0404 May 2012
Staff Comments and Questions Related to Review of STP Nuclear Operating Companys Report Entitled, Risk-Informed Resolution of GSI-191 at South Texas Project, Discussed at Public Meeting on 3/1/12 (TAC ME7735-36)
Project stage: Meeting
ML12145A4382012-05-18018 May 2012
Licensee Handout on Calibration and Benchmarking of Single and Two-Phase Jet Cfd Models
Project stage: Other
ML12145A3122012-05-18018 May 2012
E-mail Documents for Public Meeting on LOCA Frequency and Jet Formation
Project stage: Meeting
ML12145A4662012-05-18018 May 2012
Loca-Hybrid-Final
Project stage: Other
ML12146A0202012-05-31031 May 2012
Notice of 6/11/12 Meeting by Conference Call 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, Unit
Project stage: Meeting
ML1213805222012-05-31031 May 2012
3/29/12 Summary of Conference Call 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
Project stage: Meeting
ML12187A0812012-07-11011 July 2012
Summary of 6/11/12 Meeting by Conference Call 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, Uni
Project stage: Meeting
ML12234A6042012-08-21021 August 2012
Email - Documents for NRC Public Meeting on Corrosion Head Loss Experiments (Chle) Part 1 and 2
Project stage: Meeting
ML12227A5902012-08-23023 August 2012
9/6/2012 Notice of Meeting by Conference Call 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, Uni
Project stage: Meeting
ML12243A4742012-08-30030 August 2012
Email - Risk-Informed Approach to GSI-191, STP Cfd Data Analysis Report - Bypass Test Protocol
Project stage: Other
ML12261A3012012-09-21021 September 2012
Notice of Forthcoming Public 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
Project stage: Meeting
ML12270A0552012-10-0404 October 2012
9/6/2012 Summary of Meeting by Conference Call 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, Un
Project stage: Meeting
ML12300A2972012-11-0808 November 2012
Summary of Meeting by Conference Call 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
Project stage: Meeting
ML12321A1222012-11-20020 November 2012
12/3/12 Notice of Meeting by Conference Call 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, Unit
Project stage: Meeting
ML12335A1842012-11-26026 November 2012
Licensee Documents for December 12, 2012 Public Meeting
Project stage: Meeting
ML12335A1772012-11-26026 November 2012
- Licensee Documents ALION-CAL-STP for 12-10-12 Public Telecon GSI-191
Project stage: Other
ML12335A1902012-11-26026 November 2012
Licensee Documents for December 12, 2012 Public Meeting
Project stage: Meeting
ML12335A1742012-11-26026 November 2012
Email Licensee Documents for 12-10-12 Public Telecon GSI-191
Project stage: Other
ML12340A1352012-11-27027 November 2012
Meeting Notice by Conference Call with STP Nuclear Operating Company; Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution South Texas Project, Units 1 and 2
Project stage: Meeting
ML12331A2922012-11-27027 November 2012
Notice of Meeting by Conference Call 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
Project stage: Meeting
ML12341A1702012-12-20020 December 2012
12/3/12 Summary of Meeting by Conference Call 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, Uni
Project stage: Meeting
ML13004A4012013-01-31031 January 2013
Summary 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
2012-02-08
[Table View] |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 20, 2012 LICENSEE:
STP Nuclear Operating Company FACILITY:
South Texas Project, Units 1 and 2
SUBJECT:
SUMMARY
OF DECEMBER 3, 2012, 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. ME7735 AND ME7736)
On December 3,2012, 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, Maryland. The purpose of the meeting was to discuss the licensee's proposed licensing approach to the resolution of Generic Safety Issue (GSI)-191, "Assessment of Debris Accumulation on PWR [Pressurized-Water Reactor] Sump Performance," for South Texas Project (STP), Units 1 and 2. The meeting notice and agenda are located in the Agencywide Documents Access and Management System (ADAMS) at Accession No. ML12321A122. The licensee previously provided an overview of its proposed approach during the public meetings held on June 2, July 7, July 26, August 22, October 3, November 1, November 2, and December 1, 2011, and February 9, March 1, March 8, March 29, June 11, September 6, 2012, and October 10, 20121.
The licensee discussed the following licensing strategy that it intends to pursue for a risk informed approach to resolving GSI-191.
STPNOC would initially submit an exemption request only.
STPNOC would evaluate the effects of debris accumulation and in-vessel effects based on the performance of the sump during long-term cooling for those breaks associated with events that cumulatively fall within Region III of NRC Regulatory Guide (RG) 1.174, "An Approach for Using Probabilistic Risk Assessment in Risk~lnformed Decisions on Plant-Specific Changes to the licensing Basis.".
STPNOC would request a partial exemption from the provisions of paragraph 50.46(b)(5), "Long-term cooling," of Title 10 of the Code of Federal Regulations Summaries of the meetings held on June 2, July 7, July 26, August 22, October 3, November 1, November 2, and December 1, 2011, and February 9, March 1, March 8, March 29, June 11, September 6, and October 10, 2012, are available in ADAMS at Accession Nos. ML111640160, ML111950094, ML112130165, ML112411419, ML112840114, ML113120129, Ml113180196, ML113430087, ML120620541, ML120830103, ML120830086, ML121380522, ML12187A081, ML12270A055, and ML12300A297, respectively.
-2 (10 CFR), for loss-of-coolant accident (LOCA) events that cumulatively fall within Region III of RG 1.174. Specifically, 10 CFR 50.46(a)(1)(i) requires that:
ECCS cooling performance must be calculated in accordance with an acceptable evaluation model and must be calculated for a number of postulated loss-of-coolant accidents of different sizes, locations, and other properties sufficient to provide assurance that the most severe postulated loss-of-coolant accidents are calculated.
STPNOC would seek an exemption from demonstrating that long-term cooling performance acceptance criteria are met with an acceptable evaluation model for LOCA events that cumulatively fall within Region'" of RG 1.174. Based on meeting the criteria of RG 1.174, the licensee would not perform sump strainer tests or any other calculations that demonstrate adequate pump net positive suction head and that in-vessel effects limits are maintained under the most severe postulated LOCAs.
The exemption would support closing NRC Generic Letter 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents At Pressurized-Water Reactors," for STP for compliance with 10 CFR 50.46, based on NRC approval of the exemption request.
The licensee's exemption request would reference the supporting analysis. This analysis will be maintained in the licensee's Records Management System (RMS) and would be part of the exemption request.
This analysis would be maintained and controlled under the licensee's PRA program.
The licensee would change the STP updated final safety analysis report (UFSAR) based on the NRC staff's safety evaluation for the exemption.
The NRC staff queried the licensee about several aspects of the proposed approach and discussed potential problems to be considered before going forward. These include, in part, The specific provision of 10 CFR 50.46 from which the licensee would seek exemption is unclear.
- The licensee would need to completely address all of the criteria of RG 1.174 (e.g.,
defense-in-depth, safety margins) in its submittal.
- The NRC staff would expect the licensee to submit for approval the model/methodology/test results used in any of the licensee's evaluations of piping breaks, in addition to the evaluations.
- 3 No regulatory decisions were made at the meeting. A list of meeting attendees is enclosed. No Public Meeting Feedback forms were received.
Please direct any inquiries to Balwant Singal at (301) 415-3016, or balwant.singal@nrc.gov.
Sincerely, b" \\~~ ~,~~. ~
Carl F. Lyon, 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 DECEMBER 3,2012, MEETING WITH STP NUCLEAR OPERATING COMPANY REGARDING LICENSING APPROACH TO RESOLUTION OF GSI-191 ISSUE SOUTH TEXAS PROJECT, UNITS 1 AND 2 DOCKET NOS. 50-498 AND 50-499 Licensee Jamie Paul, Licensing Coley Chappell, Licensing Ernie Kee, Risk Management Linda Dyer, GSI-191 Administration U.S. Nuclear Regulatory Commission Carl Schulten, Technical SpeCifications Branch Rob Elliott, Technical Specifications Branch Tim Collins, Division of Safety Systems John Lenning, Nuclear Performance and Code Review Branch Mike Snodderly, Health Physics and Human Performance Branch John Stang, Safety Issues Resolution Branch Mike Markley, Plant Licensing Branch IV Chris Jackson, Reactor Systems Branch Donnie Harrison, PRA Licensing Branch C.J. Fong, Division of Risk Analysis Ervin Geiger, Safety Issues Resolution Branch Jack Davis, Division of Safety Systems Fred Lyon, Plant Licensing Branch IV Todd Mintz, SWRI Enclosure
- 3
- The processirelation proposed by the licensee between any exemption andlor license amendment to revise the licensing basis as described in the UFSAR and the requirements of 10 CFR 50.59 is unclear.
The staff concluded that further internal discussion of the licensing approach is necessary among the NRC staff, as well as further discussion with the licensee staff. The staff anticipates further discussion of the topic during the public meeting via conference call with the licensee scheduled for December 10,2012 (ADAMS Accession No. ML12331A292).
No regulatory decisions were made at the meeting. A list of meeting attendees is enclosed. No Public Meeting Feedback forms were received.
Please direct any inquiries to Balwant Singal at (301) 415-3016, or balwant.singal@nrc.gov.
Sincerely, IRA by Balwant K. Singal forI Carl F. Lyon, 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 DISTRIBUTION:
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BSingal 12/20/12 OFFICIAL RECORD COpy
