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| {{#Wiki_filter:REaU, UNITED STATES v CJ '"'{>> NUCLEAR REGULATORY COMMISSION t:! WASHINGTON, D.C. 20555-0001 0 t; ; | | {{#Wiki_filter:,,~p.~ REaU, _ UNITED STATES vCJ '"'{>> |
| 2011 'S-" ****-¥ STP Nuclear Operating Company South Texas Project | | o,~. _01>" NUCLEAR REGULATORY COMMISSION t:! (> WASHINGTON, D.C. 20555-0001 |
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| | ~ ~ A~gust23, 2011 |
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| | ****-¥ LICENSEE: STP Nuclear Operating Company FACILITY: South Texas Project SUB~IECT: |
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| ==SUMMARY== | | ==SUMMARY== |
| OF TELEPHONE CONFERENCE CALL HELD ON JULY 28, 2011, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION PERTAINING TO THE SOUTH TEXAS PROJECT LICENSE RENEWAL APPLICATION The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company held a telephone conference call on July 28,2011, to discuss and clarify the applicant's responses to the staff's requests for additional information (RAls) concerning the South Texas Project license renewal application. | | OF TELEPHONE CONFERENCE CALL HELD ON JULY 28, 2011, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION PERTAINING TO THE SOUTH TEXAS PROJECT LICENSE RENEWAL APPLICATION The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company held a telephone conference call on July 28,2011, to discuss and clarify the applicant's responses to the staff's requests for additional information (RAls) concerning the South Texas Project license renewal application. The telephone conference call was useful in clarifying the needs for follow-up RAls. |
| The telephone conference call was useful in clarifying the needs for follow-up RAls. Enclosure 1 provides a listing of the partiCipants and Enclosure 2 contains a listing of the clarifications for RAI responses that were discussed with the applicant, including a brief description of the status of the items. The applicant had an opportunity to comment on this summary. | | Enclosure 1 provides a listing of the partiCipants and Enclosure 2 contains a listing of the clarifications for RAI responses that were discussed with the applicant, including a brief description of the status of the items. |
| Tam Tran, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket 50-498 and 50-499 | | The applicant had an opportunity to comment on this summary. |
| | -'l~'~ |
| | Tam Tran, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos.: 50-498 and 50-499 |
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| ==Enclosures:== | | ==Enclosures:== |
| : 1. List of Participants | | : 1. List of Participants |
| : 2. List of RAI cc w/encls: Listserv TELEPHONE CONFERENCE SOUTH TEXAS LICENSE RENEWAL LIST OF JULY 28, PARTICIPANTS Tam Tran Jerry Dozier Travis Tate Donnie Harrison Steve Short Bruce Schmidt Arden Aldridge Chet Mcl ntyre Shawn Rodgers Mary Ann Billings Don Macleod AFFILIATIONS Nuclear Regulatory Commission (NRC) NRC NRC NRC Pacific Northwest National laboratory (PNNl) PNNl South Texas Project (STP) STP STP STP Engineering and Research, Inc. (ERIN) ENCLOSURE REQUESTS FOR ADDITIONAL LICENSE RENEWAL JULY 2S, The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company held a telephone conference call on July 2S, 2011, to discuss and clarify the following responses to requests for additional information (RAls) concerning the license renewal application (LRA), listed in ML11140A015. | | : 2. List of RAI cc w/encls: Listserv |
| A RAJ response supplements are needed for additional clarification RAI 1.d: The response to this RAI states that a reduced set of sequences was used for the uncertainty analysis and the results scaled so that the mean of the distribution was scaled to match the mean of the CDF point estimate or 6.39E-06 per year. It is unclear how this scaling of the CDF distribution impacts the 95 th percentile multiplier of 1.6 used in the uncertainty analysis. | | |
| Provide the mean and 95 th percentile CDF from the Monte Carlo distribution and the ratio of this 95 th percentile CDF to the point estimate CDF for the reduced set of sequences. | | TELEPHONE CONFERENCE CAll SOUTH TEXAS PRO~IECT LICENSE RENEWAL APPLICATION LIST OF PARTICIPANTS JULY 28, 2011 PARTICIPANTS AFFILIATIONS Tam Tran Nuclear Regulatory Commission (NRC) |
| If the resulting ratio is greater than 1.6, consider the impact on the SAMA cost benefit analysis provided in the environmental report (ER) and in response to RAls. Also, confirm that all CDF and release frequency values provided in the ER and in RAI responses are point estimates based on mean basic event values. RAI 1.f: The total CDF for STP _REV4 is given in Table 1-3 of the RAI response as 1.17E-05 per year. Section F.2 of the ER and page 9 of Attachment 1 to STPNOC's 2/2S/07 RMTS submittal give the total as 9.0SE-06 per year. Explain this difference and/or indicate the necessary corrections in the submittals. | | Jerry Dozier NRC Travis Tate NRC Donnie Harrison NRC Steve Short Pacific Northwest National laboratory (PNNl) |
| | Bruce Schmidt PNNl Arden Aldridge South Texas Project (STP) |
| | Chet Mcl ntyre STP Shawn Rodgers STP Mary Ann Billings STP Don Macleod Engineering and Research, Inc. (ERIN) |
| | ENCLOSURE 1 |
| | |
| | REQUESTS FOR ADDITIONAL INFORMATION LICENSE RENEWAL APPLICATION JULY 2S, 2011 The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company held a telephone conference call on July 2S, 2011, to discuss and clarify the following responses to requests for additional information (RAls) concerning the license renewal application (LRA), listed in ML11140A015. |
| | A RAJ response supplements are needed for additional clarification RAI 1.d: The response to this RAI states that a reduced set of sequences was used for the uncertainty analysis and the results scaled so that the mean of the distribution was scaled to match the mean of the CDF point estimate or 6.39E-06 per year. It is unclear how this scaling of the CDF distribution impacts the 95th percentile multiplier of 1.6 used in the uncertainty analysis. |
| | Provide the mean and 95th percentile CDF from the Monte Carlo distribution and the ratio of this 95 th percentile CDF to the point estimate CDF for the reduced set of sequences. If the resulting ratio is greater than 1.6, consider the impact on the SAMA cost benefit analysis provided in the environmental report (ER) and in response to RAls. Also, confirm that all CDF and release frequency values provided in the ER and in RAI responses are point estimates based on mean basic event values. |
| | RAI 1.f: The total CDF for STP _REV4 is given in Table 1-3 of the RAI response as 1.17E-05 per year. Section F.2 of the ER and page 9 of Attachment 1 to STPNOC's 2/2S/07 RMTS submittal give the total as 9.0SE-06 per year. |
| | Explain this difference and/or indicate the necessary corrections in the submittals. |
| RAI 2.c: The response to this RAI states that an additional initiator with a large contribution to LERF, HWIND2, that was not included in the IPE was added to the PRA later. ER Table F.2-1 does not include the HWIND2 initiator, only the HWIND initiator. | | RAI 2.c: The response to this RAI states that an additional initiator with a large contribution to LERF, HWIND2, that was not included in the IPE was added to the PRA later. ER Table F.2-1 does not include the HWIND2 initiator, only the HWIND initiator. |
| Discuss the difference between the HWIND and HWIND2 initiators, their contributions to CDF and LERF, and identify the version of the PRA model to which the HWIND2 initiator was first added. RAI 6.b: The ER discussion of the modeling of SAMA 12 appears to indicate that the only sequences impacted and credited in the cost benefit analysis are those involving leakage from the primary system. The conservative modeling discussed involves hydrogen generation for non-leakage sequences. | | Discuss the difference between the HWIND and HWIND2 initiators, their contributions to CDF and LERF, and identify the version of the PRA model to which the HWIND2 initiator was first added. |
| The response to the RAI states sequences involving this conservative ENCLOSURE 2 | | RAI 6.b: The ER discussion of the modeling of SAMA 12 appears to indicate that the only sequences impacted and credited in the cost benefit analysis are those involving leakage from the primary system. The conservative modeling discussed involves hydrogen generation for non-leakage sequences. The response to the RAI states sequences involving this conservative ENCLOSURE 2 |
| -2 modeling are included in the assessment of the impact of this SAMA. Describe how these conservatively modeled sequences are included in the SAMA evaluation. | | |
| Discussion: | | -2 modeling are included in the assessment of the impact of this SAMA. Describe how these conservatively modeled sequences are included in the SAMA evaluation. |
| The applicant indicated that the questions are clear. The applicant will provide an RAI supplement by August 19, 2011. In addition, during the discussion, the applicant provided clarification that the information in the ER for RAI 2.c is correct; hence, the staff withdraws this question (RAI 2.c). Resolution path is needed on the use of best available methodology or data for evaluation in DSEIS RAI 3.b: 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 6850, specifically in the areas of hot short probabilities, fire ignition frequencies, and suppression probabilities, indicate that the fire analysis methodologies utilized for the IPE may underestimate fire risk. Provide assurance that consideration of this new information is not expected to impact the selection of cost beneficial SAMAs for STP. Discussion: | | Discussion: The applicant indicated that the questions are clear. The applicant will provide an RAI supplement by August 19, 2011. In addition, during the discussion, the applicant provided clarification that the information in the ER for RAI 2.c is correct; hence, the staff withdraws this question (RAI 2.c). |
| The applicant indicated that the question is clear. The applicant will provide a proposed resolution by August 19, 2011. RAI 3.c: The response to this RAI did not provide the requested updated seismic CDF results instead citing IN 2010-18. While this Information Notice concluded that the US plants had adequate safety margin, it did indicate that the seismic CDF for South Texas could be as high as 3E-06 per year (for spectral accelerations of 5 hz and 10hz). This is 40 times the total seismic CDF given in the 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 PRA. Since the seismic CDF was determined using point estimates, the seismic CDF for STP _REV6, based on the LLNL hazard curve, can be obtained from the LLNL seismic frequencies from Table 3.4.4-9 of the IPEIIPEEE and the CCDPs from Table F.2-1 of the ER. The result is a SCDF of 8.7E-06 per year. Comparing the USGS hazard curves for the STP site with the 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 gives seismic CDFs of 4E-06 and 5E-06 per year, respectively. | | B. Resolution path is needed on the use of best available methodology or data for evaluation in DSEIS RAI 3.b: 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. |
| 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 STP _REV6 total CDF. | | Provide assurance that consideration of this new information is not expected to impact the selection of cost beneficial SAMAs for STP. |
| -3 Provide an assessment of the seismic CDF contribution due to the updated USGS hazard curves and the potential for cost beneficial SAMAs. Discussion: | | Discussion: The applicant indicated that the question is clear. The applicant will provide a proposed resolution by August 19, 2011. |
| The applicant indicated that the question is clear. The applicant's experts are having discussion with the industry on the use of USGS hazard curves, but this effort may not meet the license renewal schedule. | | RAI 3.c: The response to this RAI did not provide the requested updated seismic CDF results instead citing IN 2010-18. While this Information Notice concluded that the US plants had adequate safety margin, it did indicate that the seismic CDF for South Texas could be as high as 3E-06 per year (for spectral accelerations of 5 hz and 10hz). This is 40 times the total seismic CDF given in the 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 PRA. Since the seismic CDF was determined using point estimates, the seismic CDF for STP _REV6, based on the LLNL hazard curve, can be obtained from the LLNL seismic frequencies from Table 3.4.4-9 of the IPEIIPEEE and the CCDPs from Table F.2-1 of the ER. The result is a SCDF of 8.7E-06 per year. |
| The difficulty for the applicant's experts is that the use of LLNL or the USGS hazard curves may not provide consistently realistic results requiring extensive peer-reviews. | | Comparing the USGS hazard curves for the STP site with the 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. |
| The applicant is working on a proposed resolution by August 19, 2011. | | Using the above method for determining the CDF for SEIS3 and SEIS4 initiators 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 STP _REV6 total CDF. |
| August 23, 2011 STP Nuclear Operating Company South Texas Project
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| | -3 Provide an assessment of the seismic CDF contribution due to the updated USGS hazard curves and the potential for cost beneficial SAMAs. |
| | Discussion: The applicant indicated that the question is clear. The applicant's experts are having discussion with the industry on the use of USGS hazard curves, but this effort may not meet the license renewal schedule. The difficulty for the applicant's experts is that the use of LLNL or the USGS hazard curves may not provide consistently realistic results requiring extensive peer-reviews. The applicant is working on a proposed resolution by August 19, 2011. |
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| | ... ML11216A263 *concurred via email OFFICE LA:DLR* PM:RPB2:DLR BC:RPB2:DLR NAME IKing TTran DWrona DATE 8/10/11 8/18/11 8/23/11 |
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| ==SUMMARY==
| | Memorandum to STP Nuclear Operating Company from T. Tran dated August 23, 2011 |
| OF TELEPHONE CONFERENCE CALL HELD ON JULY 28, 2011, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION PERTAINING TO THE SOUTH TEXAS PROJECT LICENSE RENEWAL APPLICATION The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company held a telephone conference call on July 28,2011, to discuss and clarify the applicant's responses to the staff's requests for additional information (RAls) concerning the South Texas Project license renewal application.
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| The telephone conference call was useful in clarifying the needs for follow-up RAls. Enclosure 1 provides a listing of the participants and Enclosure 2 contains a listing of the clarifications for RAI responses that were discussed with the applicant, including a brief description of the status of the items. The applicant had an opportunity to comment on this summary. IRA! Tam Tran, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket 50-498 and 50-499
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| ==Enclosures:== | | ==SUBJECT:== |
| : 1. List of Participants
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| : 2. List of RAI cc w/encls: Listserv DISTRIBUTION:
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| See next page ADAMS Accession No . ML
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| *concurred via email .. OFFICE LA:DLR* PM:RPB2:DLR BC:RPB2:DLR NAME IKing TTran DWrona DATE 8/10/11 8/18/11 8/23/11 OFFICIAL RECORD Memorandum to STP Nuclear Operating Company from T. Tran dated August 23, 2011
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| ==SUMMARY== | | ==SUMMARY== |
| OF TELEPHONE CONFERENCE CALL HELD ON JULY 28, 2011 BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION PERTAINING TO THE SOUTH TEXAS PROJECT, LICENSE RENEWAL APPLICATION DISTRIBUTION: | | OF TELEPHONE CONFERENCE CALL HELD ON JULY 28, 2011 BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION PERTAINING TO THE SOUTH TEXAS PROJECT, LICENSE RENEWAL APPLICATION DISTRIBUTION: |
| E-MAIL: PUBLIC (or NON-PUBLIC if appropriate) | | E-MAIL: |
| | PUBLIC (or NON-PUBLIC if appropriate) |
| RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRerb Resource RidsNrrDlrRpob Resource RidsNrrDraApla Resource RidsOgcMailCenter JDaily TTran ICouret, OPA BSingal, DORL NO'Keefe GPick, RIV JDixon, RIV VDricks, RIV WMaier, RIV AVegel, RIV SGraves, RIV}} | | RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRerb Resource RidsNrrDlrRpob Resource RidsNrrDraApla Resource RidsOgcMailCenter JDaily TTran ICouret, OPA BSingal, DORL NO'Keefe GPick, RIV JDixon, RIV VDricks, RIV WMaier, RIV AVegel, RIV SGraves, RIV}} |
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Category:Memoranda
MONTHYEARML22147A0932022-06-0606 June 2022 2021 Annual Assessment Public Meeting Summary ML22034A3932022-02-16016 February 2022 Calendar Year 2021 Security Baseline Completion Memo ML21140A3892021-05-24024 May 2021 Riv Column 1 EOC 2020 Public Meeting Summary 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 ML18304A2902018-11-19019 November 2018 STP ISFSI PSP Rev 23 Review ML18289A5652018-10-16016 October 2018 Memorandum to D. White Technical Assistance Request - Review of Physical Security Plan for the South Texas Project Generating Station Independent Spent Fuel Storage Installation (CAC No.001027) ML18173A0082018-06-20020 June 2018 Cancelling Numerous Inspection Report Numbers ML17233A0082017-08-21021 August 2017 Notification of Administrative Correction to Renewed Facility Operating License ML17187A1782017-07-0606 July 2017 License Renewal Application ML17137A3252017-05-17017 May 2017 Safety Evaluation of LAR by South Texas Project Nuclear Operating Company to Adopt a Risk-Informed Resolution of Generic Safety Issue-191 ML15190A0422017-05-12012 May 2017 the NRC Staff Evaluation of the Final Rule for Continued Storage of Spent Nuclear Fuel for the License Renewal Environmental Review for South Texas Project, Units 1 and 2 ML16334A4002017-03-24024 March 2017 Climate Change Review Analysis for South Texas Project, Units 1 and 2 - License Renewal Application ML16302A0162016-10-12012 October 2016 Corrected After Action Report/ Improvement Plan for Plume Phase Exercise Conducted on 07/13/2016 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) ML13330B2222013-12-0505 December 2013 Notice 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 Project, Units 1 and 2 (TAC MF2400-MF24 ML13324A4942013-11-19019 November 2013 Deferral of Baseline Inspection Activities ML13303A9742013-10-31031 October 2013 PubMtgNotice-Nov13-2013-update ML13119A0802013-04-30030 April 2013 Notice Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed Approach to Resolve Generic Safety Issue 191 for South Texas, Units 1 and 2 ML13101A3142013-04-12012 April 2013 Notice of Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed Approach to Resolve Generic Safety Issue 191 for South Texas, Units 1 and 2 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 ML13046A0652013-02-22022 February 2013 3/5/13 Notice of Preapplication Meeting Via Conference Call with STP Nuclear Operating Company to Discuss License Amendment Request for Fire Protection Program to Credit Additional Operator Actions for South Texas, Units 1 and 2 ML12342A3972013-01-0303 January 2013 Forthcoming Meeting to Discuss the Draft Supplemental Environmental Impact Statement for the License Renewal of South Texas Project, Units 1 and 2 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 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 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 ML12312A2342012-11-13013 November 2012 Memo to File Summary Verbal Authorization Provided on 11/6/12 for Relief Request RR-ENG-3-10, RPV Head Flange O-Ring Leakoff Lines NDE, Third 10-Year Inservice Inspection Interval ML12243A4042012-09-25025 September 2012 Notice of Prelicensing Meeting with STP Nuclear Operating Company to Discuss Proposed Amendment for Approval of Revised Fire Protection Program Related to Alternate Shutdown Capability for South Texas, Units 1 and 2 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 ML12227A5602012-09-12012 September 2012 Summary of Telephone Conference Call Held on August 9, 2012, Between NRC and STPNOC, Concerning Clarification of One Part of Response to RAI 4.3-13. Pertaining to the STP, Units 1 and 2, LRA 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 ML12226A4552012-08-15015 August 2012 Forthcoming Meeting with STP Nuclear Operating Company Regarding License Renewal for the South Texas Project, Units 1 and 2 ML12206A3032012-08-0707 August 2012 Summary of Telephone Conference Call Held on 7/3/12, Between the U.S. NRC and STP Nuclear Operating Company, Concerning Debris from Coating Failures - Followup, Pertaining to the South Texas Project, Units 1 and 2, LRA, TAC Nos. ME4936 and 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 ML12080A0352012-04-19019 April 2012 Summary of Telephone Conference Call Held on February 22, 2012 Between the U.S. Nuclear Regulatory Commission and STP Nuclear Operating Company, Regarding Requests for Additional Information STP - Record of Conference Call-02222012 on RAIs- ML12080A0552012-04-11011 April 2012 STP - Record of Conference Call-03082012 on RAIs-SGTI-RxHeadStudClosures ML12080A0492012-04-11011 April 2012 STP - Record of Conference Call-03012012 on RAIs-RV Beltline ML12080A0442012-04-11011 April 2012 STP - Record of Conference Call-02092012 on RAIs-TLAAs ML12080A0402012-04-11011 April 2012 STP - Record of Conference Call-020162012 on RAIs-RVIs-31180-etc 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 ML1203400432012-02-0303 February 2012 Notice of Forthcoming Meeting Via Conference Call with STP Nuclear Operating Company 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 ML1200901012012-01-10010 January 2012 Notice of Forthcoming Public Meeting Via Conference Call with South Texas Project Nuclear Operating Company ML11348A0392012-01-0404 January 2012 and 12/1/11, Summary of Telephone Conference Calls Between the U.S. Nuclear Regulatory Commission and STP Nuclear Operating Company, Concerning Requests for Additional Information Pertaining to the South Texas Project LRA - Set 9 ML11320A1162011-12-0505 December 2011 November 9, 2011, Summary of Telephone Conference Call Held Between the U.S. Nuclear Regulatory Commission and STP Nuclear Operating Company, Concerning Requests for Additional Information Pertaining to the South Texas Project Units 1 and 2 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 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 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 ML11216A2632011-08-23023 August 2011 Summary of Telephone Conference Call Held on July 28, 2011, Between the U.S. NRC and STP Nuclear Operating Company, Concerning RAI Pertaining to the South Texas Project, LRA 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 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 2022-06-06
[Table view] 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
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24024A1162024-01-24024 January 2024 STP Unit 2 Request for Information ML23334A0062023-11-29029 November 2023 NRR E-mail Capture - South Texas Project - Request for Additional Information - Proposed Alternative to ASME BPV Code Requirements ML23319A4442023-11-15015 November 2023 NRR E-mail Capture - South Texas Project - Draft Request for Additional Information - Proposed Alternative to ASME BPV Code Requirements ML23278A1532023-10-0505 October 2023 NRR E-mail Capture - South Texas Project Request for Additional Information - Request for Indirect Transfer of Licenses and Conforming Amendments (L-2023-LLM-0004) ML23264A0972023-09-21021 September 2023 NRR E-mail Capture - South Texas Project - Request for Additional Information - License Amendment Request to Revise the Alternate Source Term Dose Calculation (L-2023-LLA-0047) ML23255A2862023-09-12012 September 2023 NRR E-mail Capture - South Texas Project Draft Request for Additional Information License Amendment Request to Revise the Alternate Source Term Dose Calculation (L-2023-LLA-0047) ML23145A1872023-05-24024 May 2023 July 2023 Emergency Preparedness Program Inspection - Request for Information ML22255A1542022-09-13013 September 2022 Operating Company Information Request for the Cyber Security Baseline Inspection 05000498/2022401 and 05000499/2022401 ML22206A0142022-07-20020 July 2022 NRR E-mail Capture - South Texas Project - Request for Additional Information - 10 CFR 20.2002 Alternate Disposal Request ML22194A0502022-07-0707 July 2022 NRR E-mail Capture - South Texas Project - Updated Draft Request for Additional Information - 10 CFR 20.2002 Alternate Disposal Request ML22194A0492022-06-0808 June 2022 NRR E-mail Capture - South Texas Project - Draft Request for Additional Information - 10 CFR 20.2002 Alternate Disposal Request ML22123A3272022-05-0303 May 2022 STP EP Exercise Inspection July 2022 RFI ML22084A0762022-04-0404 April 2022 Notification of NRC Design Bases Assurance Inspection (Team) (05000498/2022012 and 05000499/2022012) and Request for Information ML21286A5732021-10-18018 October 2021 Notification of NRC Design Bases Assurance Inspection (Programs) (05000498/2022011 and 05000499/2022011) and Request for Information ML21166A2392021-06-16016 June 2021 Notification of Inspection (NRC Inspection Report 05000498/2021003 and 05000499/2021003) and Request for Information ML21160A1522021-06-0909 June 2021 Request for Information NRC Inspection 2021-003 Public Radiation Safety ML21133A2372021-05-0505 May 2021 Request for Additional Information: STP EP Exercise Inspection - July 2021 ML21039A8902021-02-0808 February 2021 NRR E-mail Capture - South Texas Project - Request for Additional Information - 1RE22 Inspection Summary Report for Steam Generator Tubing ML21029A3312021-01-29029 January 2021 NRR E-mail Capture - South Texas Project - Draft Request for Additional Information - 1RE22 Inspection Summary Report for Steam Generator Tubing ML20280A5452020-08-17017 August 2020 STP 2020 PIR Request for Information ML20111A0052020-04-17017 April 2020 NRR E-mail Capture - South Texas Project - Request for Additional Information - Proposed Alternative to ASME OM Code 2012 Edition - Relief Request PRR-01 ML20070N0222020-03-10010 March 2020 NRC Selection for Onsite Review ML20057G4612020-02-26026 February 2020 05000498/499 Request for Information - Occupational Radiation Safety Inspection ML20045E2172020-02-13013 February 2020 Licensed Operator Positive Fitness-For-Duty Test ML20036F5862020-02-0404 February 2020 Request for Additional Information - Proposed Alternative to ASME Code Requirements for the Repair of Essential Cooling Water System Class 3 Buried Piping (EPID L-2019-LLR-0096)Redacted ML19165A1032019-06-14014 June 2019 NRR E-mail Capture - Draft RAI for STP TS 3.8.1.1 Sbdg SR Change ML19081A1512019-03-21021 March 2019 NRR E-mail Capture - Draft Round 2 RAI - Sbdg Voltage and Frequency LAR (L-2018-LLA-0078) ML18283B9522018-10-10010 October 2018 NRR E-mail Capture - Final RAI - South Texas Standby DG TS Change (L-2018-LLA-0078) ML18263A1432018-09-12012 September 2018 NRR E-mail Capture - Final RAI for South Texas Project RR-ENG-E-16 (L-2018-LLR-0097) ML18197A4172018-07-17017 July 2018 Notification of NRC Triennial Heat Sink Performance Inspection (05000498/2018003 and 05000499/2018003) and Request for Information ML18003B4222018-01-0303 January 2018 NRR E-mail Capture - Final Request for Additional Information Amendment Request to Modify the Emergency Response Organization for South Texas Project ML17229B4672017-08-16016 August 2017 Notification of NRC Inspection 05000499/2017008 and Request for Information ML17132A0712017-05-15015 May 2017 Information Request the Cyber Security Baseline Inspection, Notification to Perform Inspection 05000498/2017407; 05000499/2017407 ML17103A6272017-04-13013 April 2017 Notification of Evaluations of Changes, Tests, and Experiments Inspection (05000498/2017007 and 05000499/2017007) and Request for Information ML16351A1502016-12-16016 December 2016 Correction Letter Closeout of Request for Information Questions That Are No Longer Applicable Associated with the Resolution of Generic Safety Issue 191 (CAC Nos. MF2400 - MF2409) ML16302A4532016-12-12012 December 2016 Closeout of Request for Additional Information Questions That Are No Longer Applicable, Resolution of Generic Safety Issue (GSI) 191 (CAC Nos. MF2400-MF2409) ML16343A0422016-12-0808 December 2016 Request for Additional Information for the Review of the South Texas Project, Units 1 and 2 License Renewal Application (CAC NOS. ME4936, ME4937) ML16340A1022016-12-0505 December 2016 Requests for Additional Information for the Review of the South Texas Project License Renewal Application (CAC Nos. ME4936 and ME4937) ML16246A0952016-09-15015 September 2016 Correction to 8/26/16 Request for Additional Information Enclosure, License Amendment Request to Revise Technical Specification 5.3.2 to Allow Operation with 56 Full-Length Control Rod Assemblies ML16214A2912016-08-26026 August 2016 Summary of June 28-30, 2016, Regulatory Audit at Westinghouse in Rockville, MD, License Amendment Request to Revise Technical Specification 5.3.2 to Allow Operation with 56 Full-Length Control Rod Assemblies ML16187A0522016-07-0707 July 2016 Request for Additional Information Regarding License Renewal Application ML16141B0812016-05-31031 May 2016 Audit Summary, Risk Audit on April 12-13, 2016, at Alumni Center at the University of Texas, Austin, Tx; Pilot Generic Safety Issue 191 Submittal and Exemption Request, and Draft Request for Additional Information ML16125A2902016-05-26026 May 2016 Request for Additional Information, Risk Review, Exemption and License Amendment Request for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 (CAC Nos. MF2400-MF2409) ML16127A4522016-05-12012 May 2016 Supplemental Information Needed for Acceptance of Requested Licensing Action, Amendment Request to Revise Technical Specification 5.3.2 to Allow Operation with 56 Full-Length Control Rod Assemblies ML16104A3522016-04-22022 April 2016 Requests for Additional Information Set 35 for the Review of the South Texas Project License Renewal Application (Tac Nos. ME4936, ME4937) ML16082A5072016-04-11011 April 2016 Request for Additional Information, Phased Response Requested, Exemption and License Amendment Request for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 (CAC Nos. MF2400-MF2409) ML16082A4842016-03-22022 March 2016 NRR E-mail Capture - South Texas Project Units 1 & 2, Draft Request for Additional Information for Risk Review for GSI-191 ML16081A0042016-03-18018 March 2016 NRR E-mail Capture - South Texas Project Units 1 & 2, Draft Request for Additional Information for Thermal-hydraulic Review for GSI-191 ML16053A1872016-03-0101 March 2016 Request for Additional Information, Request to Revise Technical Specification 6.8.3.j, Containment Leakage Rate Testing Program, to Extend Integrated Leak Rate Test Interval from 10 to 15 Years (CAC MF6176-MF6177) ML16060A2872016-02-29029 February 2016 NRR E-mail Capture - Request for Additional Information - STP LRA Safety Review 2024-01-24
[Table view] |
Text
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- -¥ LICENSEE: STP Nuclear Operating Company FACILITY: South Texas Project SUB~IECT:
SUMMARY
OF TELEPHONE CONFERENCE CALL HELD ON JULY 28, 2011, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION PERTAINING TO THE SOUTH TEXAS PROJECT LICENSE RENEWAL APPLICATION The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company held a telephone conference call on July 28,2011, to discuss and clarify the applicant's responses to the staff's requests for additional information (RAls) concerning the South Texas Project license renewal application. The telephone conference call was useful in clarifying the needs for follow-up RAls.
Enclosure 1 provides a listing of the partiCipants and Enclosure 2 contains a listing of the clarifications for RAI responses that were discussed with the applicant, including a brief description of the status of the items.
The applicant had an opportunity to comment on this summary.
-'l~'~
Tam Tran, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos.: 50-498 and 50-499
Enclosures:
- 1. List of Participants
- 2. List of RAI cc w/encls: Listserv
TELEPHONE CONFERENCE CAll SOUTH TEXAS PRO~IECT LICENSE RENEWAL APPLICATION LIST OF PARTICIPANTS JULY 28, 2011 PARTICIPANTS AFFILIATIONS Tam Tran Nuclear Regulatory Commission (NRC)
Jerry Dozier NRC Travis Tate NRC Donnie Harrison NRC Steve Short Pacific Northwest National laboratory (PNNl)
Bruce Schmidt PNNl Arden Aldridge South Texas Project (STP)
Chet Mcl ntyre STP Shawn Rodgers STP Mary Ann Billings STP Don Macleod Engineering and Research, Inc. (ERIN)
ENCLOSURE 1
REQUESTS FOR ADDITIONAL INFORMATION LICENSE RENEWAL APPLICATION JULY 2S, 2011 The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company held a telephone conference call on July 2S, 2011, to discuss and clarify the following responses to requests for additional information (RAls) concerning the license renewal application (LRA), listed in ML11140A015.
A RAJ response supplements are needed for additional clarification RAI 1.d: The response to this RAI states that a reduced set of sequences was used for the uncertainty analysis and the results scaled so that the mean of the distribution was scaled to match the mean of the CDF point estimate or 6.39E-06 per year. It is unclear how this scaling of the CDF distribution impacts the 95th percentile multiplier of 1.6 used in the uncertainty analysis.
Provide the mean and 95th percentile CDF from the Monte Carlo distribution and the ratio of this 95 th percentile CDF to the point estimate CDF for the reduced set of sequences. If the resulting ratio is greater than 1.6, consider the impact on the SAMA cost benefit analysis provided in the environmental report (ER) and in response to RAls. Also, confirm that all CDF and release frequency values provided in the ER and in RAI responses are point estimates based on mean basic event values.
RAI 1.f: The total CDF for STP _REV4 is given in Table 1-3 of the RAI response as 1.17E-05 per year. Section F.2 of the ER and page 9 of Attachment 1 to STPNOC's 2/2S/07 RMTS submittal give the total as 9.0SE-06 per year.
Explain this difference and/or indicate the necessary corrections in the submittals.
RAI 2.c: The response to this RAI states that an additional initiator with a large contribution to LERF, HWIND2, that was not included in the IPE was added to the PRA later. ER Table F.2-1 does not include the HWIND2 initiator, only the HWIND initiator.
Discuss the difference between the HWIND and HWIND2 initiators, their contributions to CDF and LERF, and identify the version of the PRA model to which the HWIND2 initiator was first added.
RAI 6.b: The ER discussion of the modeling of SAMA 12 appears to indicate that the only sequences impacted and credited in the cost benefit analysis are those involving leakage from the primary system. The conservative modeling discussed involves hydrogen generation for non-leakage sequences. The response to the RAI states sequences involving this conservative ENCLOSURE 2
-2 modeling are included in the assessment of the impact of this SAMA. Describe how these conservatively modeled sequences are included in the SAMA evaluation.
Discussion: The applicant indicated that the questions are clear. The applicant will provide an RAI supplement by August 19, 2011. In addition, during the discussion, the applicant provided clarification that the information in the ER for RAI 2.c is correct; hence, the staff withdraws this question (RAI 2.c).
B. Resolution path is needed on the use of best available methodology or data for evaluation in DSEIS RAI 3.b: 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.
Provide assurance that consideration of this new information is not expected to impact the selection of cost beneficial SAMAs for STP.
Discussion: The applicant indicated that the question is clear. The applicant will provide a proposed resolution by August 19, 2011.
RAI 3.c: The response to this RAI did not provide the requested updated seismic CDF results instead citing IN 2010-18. While this Information Notice concluded that the US plants had adequate safety margin, it did indicate that the seismic CDF for South Texas could be as high as 3E-06 per year (for spectral accelerations of 5 hz and 10hz). This is 40 times the total seismic CDF given in the 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 PRA. Since the seismic CDF was determined using point estimates, the seismic CDF for STP _REV6, based on the LLNL hazard curve, can be obtained from the LLNL seismic frequencies from Table 3.4.4-9 of the IPEIIPEEE and the CCDPs from Table F.2-1 of the ER. The result is a SCDF of 8.7E-06 per year.
Comparing the USGS hazard curves for the STP site with the 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 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 STP _REV6 total CDF.
-3 Provide an assessment of the seismic CDF contribution due to the updated USGS hazard curves and the potential for cost beneficial SAMAs.
Discussion: The applicant indicated that the question is clear. The applicant's experts are having discussion with the industry on the use of USGS hazard curves, but this effort may not meet the license renewal schedule. The difficulty for the applicant's experts is that the use of LLNL or the USGS hazard curves may not provide consistently realistic results requiring extensive peer-reviews. The applicant is working on a proposed resolution by August 19, 2011.
... ML11216A263 *concurred via email OFFICE LA:DLR* PM:RPB2:DLR BC:RPB2:DLR NAME IKing TTran DWrona DATE 8/10/11 8/18/11 8/23/11
Memorandum to STP Nuclear Operating Company from T. Tran dated August 23, 2011
SUBJECT:
SUMMARY
OF TELEPHONE CONFERENCE CALL HELD ON JULY 28, 2011 BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, CONCERNING REQUESTS FOR ADDITIONAL INFORMATION PERTAINING TO THE SOUTH TEXAS PROJECT, LICENSE RENEWAL APPLICATION DISTRIBUTION:
E-MAIL:
PUBLIC (or NON-PUBLIC if appropriate)
RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRerb Resource RidsNrrDlrRpob Resource RidsNrrDraApla Resource RidsOgcMailCenter JDaily TTran ICouret, OPA BSingal, DORL NO'Keefe GPick, RIV JDixon, RIV VDricks, RIV WMaier, RIV AVegel, RIV SGraves, RIV