ML20203M057
Letter Sequence Meeting | |
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EPID:L-2020-LLA-0004, Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02) (Approved, Closed) | |
Initiation Administration Questions Answers | |
MONTHYEARCNL-19-066, Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02)2020-01-14014 January 2020
[Table View]Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02) Project stage: Request CNL-20-026, Supplement to Application to Revise Sequoyah Nuclear Plant Units 1 and 2 Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02)2020-02-18018 February 2020 Supplement to Application to Revise Sequoyah Nuclear Plant Units 1 and 2 Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02) Project stage: Supplement ML20054B5532020-02-20020 February 2020 NRR E-mail Capture - Sequoyah Nuclear Plant, Units 1 and 2 - Acceptance of License Amendment Request to Modify the UFSAR Based on a New Hydrologic Analysis Project stage: Acceptance Review ML20106F1042020-04-14014 April 2020 Request for Additional Information Regarding the Hydrologic Analysis LAR Project stage: RAI CNL-20-032, Response to Request for Additional Information (TS-19-02) Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis2020-05-14014 May 2020 Response to Request for Additional Information (TS-19-02) Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis Project stage: Response to RAI ML20141L7672020-05-28028 May 2020 Request for Withholding Information from Public Disclosure Project stage: Withholding Request Acceptance ML20189A2112020-07-0101 July 2020 Request for Additional Information Regarding Hydrologic UFSAR Update Project stage: RAI ML20203M0572020-07-16016 July 2020 Updated TVA Non-Proprietary Slides for Open Session of July 16, 2020, Partially Closed Public Meeting to Discuss Sequoyah License Amendment Request Project stage: Meeting ML20196L7922020-07-16016 July 2020 Corrected TVA Non-Proprietary Slides for Open Session of July 16, 2020, Partially Closed Public Meeting to Discuss Sequoyah License Amendment Request Project stage: Meeting ML20196L6892020-07-16016 July 2020 TVA Non-Proprietary Slides for Open Session of July 16, 2020, Partially Closed Public Meeting to Discuss Sequoyah License Amendment Request Project stage: Meeting ML20203M2292020-08-11011 August 2020 July 16, 2020, Summary of Partially Closed Meeting with Tennessee Valley Authority to Discuss Responses to Requests for Additional Information Regarding Updated Final Safety Analysis Report Hydrologic Analysis License Amendment Request Project stage: RAI CNL-20-057, Tennessee Valley Authority - Application to Revise Sequoyah Nuclear Plant Units 1 & 2 Updated FSAR Changes to Hydrologic Analysis - Partial Response to Additional Request for Additional Information (TS-19-02)2020-08-12012 August 2020 Tennessee Valley Authority - Application to Revise Sequoyah Nuclear Plant Units 1 & 2 Updated FSAR Changes to Hydrologic Analysis - Partial Response to Additional Request for Additional Information (TS-19-02) Project stage: Request ML20261H4162020-09-0202 September 2020 NRR E-mail Capture - Draft Request for Additional Information - Sequoyah Nuclear Plant, Units 1 and 2, Request to Revise UFSAR Hydrologic Analysis Project stage: Draft RAI ML20261H4182020-09-14014 September 2020 NRR E-mail Capture - Sequoyah Nuclear Plant, Units 1 and 2 - Audit Plan and Setup of Online Reference Portal Project stage: Other ML20261H4172020-09-14014 September 2020 NRR E-mail Capture - Sequoyah Nuclear Plant, Units 1 and 2 - Request for Additional Information Regarding Hydrologic UFSAR Update Project stage: RAI ML20293A0802020-10-28028 October 2020 Summary of October 13, 2020, Closed Meeting with TVA on Responses to Requests for Additional Information Updated Final Safety Analysis Report Hydrologic Analysis License Amendment Request Project stage: RAI ML20316A0182020-11-10010 November 2020 NRR E-mail Capture - Sequoyah Nuclear Plant, Units 1 and 2 - Audit Plan and Setup of Online Reference Portal Project stage: Other CNL-20-082, Partial Response to Request for Additional Information Regarding Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis (TS-19-02)2020-11-10010 November 2020 Partial Response to Request for Additional Information Regarding Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis (TS-19-02) Project stage: Response to RAI ML20343A1182021-01-12012 January 2021 Request for Withholding Information from Public Disclosure Project stage: Withholding Request Acceptance ML21068A4082021-03-0909 March 2021 NRR E-mail Capture - Sequoyah Nuclear Plant, Units 1 and 2 - Supplement 2 to Audit Plan and Setup of Online Reference Portal Project stage: Other CNL-21-024, Partial Response to Additional Request for Information Re Application to Revise Updated Final Safety Analysis Report Re Changes to Hydrologic Analysis (TS-19-02)2021-06-15015 June 2021 Partial Response to Additional Request for Information Re Application to Revise Updated Final Safety Analysis Report Re Changes to Hydrologic Analysis (TS-19-02) Project stage: Request ML21239A1152021-08-13013 August 2021 Partial Response to Additional Request for Additional Information, (Question 2) Regarding Application to Revise Sequoyah Nuclear Plant, Units 1 and 2 Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis - Correction Project stage: Request CNL-21-095, Submittal of Application to Revise Sequoyah Nuclear Plant, Units 1 and 2, 10 CFR 50.90 Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis - Software Dedication Report 16-01 - Update .2021-12-21021 December 2021 Submittal of Application to Revise Sequoyah Nuclear Plant, Units 1 and 2, 10 CFR 50.90 Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis - Software Dedication Report 16-01 - Update . Project stage: Request CNL-23-012, Revision to the Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02)2023-04-11011 April 2023 Revision to the Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02) Project stage: Request ML24039A0792024-02-12012 February 2024 – Summary of Regulatory Audit Regarding the License Amendment Request for Hydrologic Analysis Changes to the Updated Final Safety Analysis Report (EPID L-2020-LLA-0004) - Public Project stage: Other ML24074A4252024-03-14014 March 2024 NRR E-mail Capture - Sequoyah Hydrologic Analysis License Amendment Request - Notification of Change to Estimated Completion and Hours Project stage: Other ML24040A2062024-03-26026 March 2024 Issuance of Amendment Nos. 367 and 361 Regarding Changes to the Hydrologic Analyses (EPID L-2020-LLA-0004) - Public Project stage: Approval 2020-08-12 |
ML20203M057 | |
Person / Time | |
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Site: | Sequoyah |
Issue date: | 07/16/2020 |
From: | Tennessee Valley Authority |
To: | Office of Nuclear Reactor Regulation |
References | |
EPID L-2020-LLA-0004 | |
Download: ML20203M057 (12) | |
Similar Documents at Sequoyah | |
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Category:Meeting Agenda
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[Table view]Meeting with Tennessee Valley Authority to Discuss a Proposed Sequoyah Nuclear Plant, Unit 2, Fitness for Duty Exemption PMNS20241312, Meeting with Tennessee Valley Authority to Discuss a Proposed Sequoyah Nuclear Plant License Amendment Request to Revise Technical Specification 3.4.14 Related to Reactor Coolant System Pressure Isolation Valve Leakage2024-11-0606 November 2024 Meeting with Tennessee Valley Authority to Discuss a Proposed Sequoyah Nuclear Plant License Amendment Request to Revise Technical Specification 3.4.14 Related to Reactor Coolant System Pressure Isolation Valve Leakage PMNS20241229, Meeting with Tennessee Valley Authority to Discuss a Proposed License Amendment Request for Sequoyah Nuclear Plant, Units 1 and 2, and Watts Bar Nuclear Plant, Units 1 and 22024-10-0303 October 2024 Meeting with Tennessee Valley Authority to Discuss a Proposed License Amendment Request for Sequoyah Nuclear Plant, Units 1 and 2, and Watts Bar Nuclear Plant, Units 1 and 2 PMNS20241083, Pre-submittal Meeting with Tennessee Valley Authority to Discuss a Proposed Sequoyah Nuclear Plant, Unit 2, Alternative Related to Main Steam Safety Valve Surveillance Requirement 3.7.1.12024-08-27027 August 2024 Pre-submittal Meeting with Tennessee Valley Authority to Discuss a Proposed Sequoyah Nuclear Plant, Unit 2, Alternative Related to Main Steam Safety Valve Surveillance Requirement 3.7.1.1 PMNS20241102, Meeting with Tennessee Valley Authority to Discuss a Proposed Sequoyah Nuclear Plant License Amendment Request to Revise Technical Specs 3.3.6 and 3.9.4 Related to Containment Isolation/Penetrations and the Fuel Handling a2024-08-21021 August 2024 Meeting with Tennessee Valley Authority to Discuss a Proposed Sequoyah Nuclear Plant License Amendment Request to Revise Technical Specs 3.3.6 and 3.9.4 Related to Containment Isolation/Penetrations and the Fuel Handling a ML24228A2312024-08-15015 August 2024 TVA Meeting Slides for August 19 Public Meeting Re QAPD Supplement ML24225A2542024-08-14014 August 2024 August 14, 2024 - 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Pre-Submittal Teleconference for Proposed Amendment Request Regarding the Change for the Sequoyah and Watts Bar Nuclear Plants Technical Specification 3.4.12 Meeting Slides ML22103A0852022-04-14014 April 2022 And Watts Bar Plant Pre-submittal Meeting for Inservice Testing (IST) Program Request for Alternative for the Motor Driven Auxiliary Feedwater Pump Testing Following Maintenance During an Outage Per ISTB-3310 ML22080A1662022-03-21021 March 2022 TVA Nuclear Plants -2021 EOC Media Loop Slides for Automatic Play ML22046A2932022-02-15015 February 2022 Pre-submittal Meeting Presentation - Request for Alternative to ASME OM Code ISTC-3630 Regarding Leakage of Pressure Isolation Valves ML21308A4932021-11-0808 November 2021 Pre-submittal Meeting Presentation - License Amendment Request to Revise Sequoyah Operating License to Use Fire and Seismic PRA Models for 10 CFR 50.69 Risk-Informed Categorizations (EPID L-2021-LRM-0109) (Slides) ML21281A2282021-10-13013 October 2021 Tennessee Valley Authority Fleet Pre-Submittal Meeting for License Amendment Request to Change Emergency Action Level Scheme Presentation - October 13, 2021 (EPID L-2021-LRM-0096) (Slides) ML21252A3632021-09-15015 September 2021 Pre-Submittal Meeting for License Amendment Request to Eliminate the High Negative Flux Rate Trip ML21197A0022021-08-0505 August 2021 N-769-6 Relief Pre-Submittal TVA Presentation August 2021 ML21111A0202021-04-21021 April 2021 TVA Slides for April 21, 2021 Public Meeting to Discuss Planned Sequoyah Amendment Request ML21096A1002021-04-0606 April 2021 Annual Assessments ML21061A0892021-03-0202 March 2021 TVA Presentation Slides for March 2, 2021, Public Meeting to Discuss Sequoyah Alternative Request ML20196L6892020-07-16016 July 2020 TVA Non-Proprietary Slides for Open Session of July 16, 2020, Partially Closed Public Meeting to Discuss Sequoyah License Amendment Request ML20203M0572020-07-16016 July 2020 Updated TVA Non-Proprietary Slides for Open Session of July 16, 2020, Partially Closed Public Meeting to Discuss Sequoyah License Amendment Request ML20196L7922020-07-16016 July 2020 Corrected TVA Non-Proprietary Slides for Open Session of July 16, 2020, Partially Closed Public Meeting to Discuss Sequoyah License Amendment Request ML20175A0552020-06-23023 June 2020 TVA Slides for June 23, 2020, Emergency Plan Change Presubmittal Meeting ML20163A6952020-06-12012 June 2020 Bpg Presentation on TVA SCWE Final 2 ML20112F5302020-04-21021 April 2020 TVA Nuclear Plants -2019 EOC Media Loop Slides for Automatic Play (Final) ML20108E9082020-04-16016 April 2020 Presentation Slides for Sequoyah Nuclear Plant, Unit 2 - Exigent License Amendment Request TS 4.2.2, Control Rod Assemblies, Pre-Submittal Conference Call - April 16, 2020 ML20050C8662020-02-20020 February 2020 February 20, 2020 - Pre-Submittal Meeting Presentation - Permanent Operation with Control Rod H8 Removed ML20049G1822020-02-18018 February 2020 February 20, 2020 - Pre-submittal Meeting Presentation - Transition to Westinghouse Fuel ML20024D2112020-01-27027 January 2020 Pre-Submittal Meeting for License Amendment Request (LAR) Revised Steam Generator (SG) Inspection Intervals - January 27, 2020 ML19325C7142019-12-0202 December 2019 November 15,2019, Summary of Conference Call with Tennessee Valley Authority to Discuss Submittal of Exigent License Request (EPID L-2019-LLA-0239) for Sequoyah Nuclear Plant, Unit 1 ML19323D8882019-11-15015 November 2019 TVA Pre-submittal Presentation Slides - Exigent Amendment ML19161A2392019-06-10010 June 2019 Plants Pre-Submittal Meeting for Proposed License Amendments Hydrological Analysis Updates June 10, 2019 ML19164A2032019-05-30030 May 2019 OEDO-19-00288-TVA Sequoyah Leadership Forum Power Point ML19142A2772019-05-21021 May 2019 Summary of Public Meeting - Sequoyah Nuclear Plant ML18312A3502018-11-14014 November 2018 Meeting to Discuss Proposed Technical Specification Changes Needed of Associated with the Use of Westinghouse Robust Fuel Assemblies at Sequoyah Nuclear Plant Units 1 & 2 - November 14, 2018 ML18164A3092018-06-13013 June 2018 June 6, 2018 Summary of Public Meeting - Sequoyah Nuclear Plant - Docket Nos. 50-327 and 50-328 ML17271A0162017-09-28028 September 2017 Meeting Slide for Tennessee Valley Authority (TVA) Hydrology Precipitation Model Topical Report Review Status ML17212A8432017-08-0101 August 2017 Meeting Slides for Pre-submittal Meeting with Tennessee Valley Authority on Unbalanced Voltage License Amendment Request for TVA Nuclear Plants ML17053A0232017-02-22022 February 2017 Slides for Meeting with Tennessee Valley Authority to Discuss HEC-RAS Flood Model Project: Seismic Dam Failure Methodology ML16102A3302016-04-0404 April 2016 Presentation Slides for 04042016 Public Meeting on Resolution of TVA Flood Model Issue ML14259A1662014-09-17017 September 2014 Meeting Slides for the September 17, 2014 Public Meeting to Discuss the Dseis for License Renewal of Sequoyah Units 1 and 2 ML14262A3302014-09-16016 September 2014 9/16/2014 Meeting Slide for Sequoyah Nuclear Plant, Units 1 and 2 Regarding AST Presentation ML14101A1522014-04-11011 April 2014 Summary of Public and Closed Meeting for Tennessee Valley Authority 2013 Synergy Safety Culture Survey Results 2024-08-15 |
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Sequoyah Nuclear Plant (SQN)
Responses to NRC Request for Additional Information (RAI) Regarding License Amendment Request (LAR) for Hydrological Analysis Update July 16, 2020
Introduction
Background
Proposed Responses to NRC RAIs (Non-Proprietary)
Schedule for Submittal Proposed Responses to NRC RAIs (Proprietary)
Agenda l 2
Introduction Purpose of the meeting is to resolve questions raised by the NRC Quality Assurance and Vendor Inspection Branch (IQVB) regarding the TVA LAR for the SQN Hydrologic Analysis.
Resolution of these questions is important to not only the SQN LAR, but also the planned WBN Hydrology LAR.
Portions of the NRC RAI and proposed TVA responses contain proprietary information and will be discussed during the closed session.
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Background===
TVA LAR for the SQN Hydrologic Analysis submitted to NRC on 1/14/2020 (ML20016A396 and ML20016A397).
Supplement to the LAR submitted on 2/18/2020 (ML20049H184).
Responses to NRC IQVB RAIs submitted on 5/14/2020 (ML20135H065).
Second round RAIs from NRC IQVB received on 7/1/2020 (ML20189A211).
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NRC Question 1.1 TVA stated that the ArcGIS software uses gridded shapefile data to create a Triangular Irregular Network (TIN) surface that is used via a polygon volume tool to compute the sub-basin average Probable Maximum Precipitation (PMP) depths. In contrast, the QGIS alternate methodology utilizes the nearest neighbor geoprocessing tool to generate a raster surface that then uses a grid statistics tool to generate the nearest neighbor geoprocessing tool. It is unclear what the technical difference is between methodologies used to create a TIN surface and a raster surface and between the polygon volume tool and nearest neighbor geoprocessing tool used to create the sub-basin average PMP depths. Therefore, the NRC staff requests TVA to clarify how these two methodologies are technically different such that the use of these alternate calculation methodologies can be credited to prevent the same erroneous outputs in both GIS tools.
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TVA Response to NRC Question 1.1 l 6 ArcGIS Methodology PMP Evaluation Tool outputs gridded PMP depth data along a uniform grid with resolution 0.025 by 0.025 decimal degrees ArcGIS triangulation to create a Triangular Irregular Network (TIN) surface representing PMP Depth over basin where depth is interpolated along triangle edges Average basin precipitation depth =
Volume of PMP Surface above the basin boundary divided by basin area
TVA Response to NRC Question 1.1 l 7 QGIS Methodology PMP Evaluation Tool depths used to create Raster through QGIS Nearest Neighbor tool.
Only grid cells with centroid in basin utilized.
Improved accuracy by bilinear interpolation by resampling tool Average basin precipitation depth= average grid cell height within the basin boundary Differences in Methods Triangulation vs Bilinear interpolation Polygon volume vs Arithmetic averaging of grid cells
NRC Question 1.2 In Enclosure 3, Gridded PMP Development Calculation of the RAI response, Appendix A GIS PMP Event Depth Computations, Section 6.5, states Review of computed PMP depths across the ArcGIS and QGIS platforms identified a project PMP depth above Chatuge as an outlier. Analysis indicated areas around the sub-basin boundary with zero depth as the PMP points from the [Applied Weather Associates (AWA)] tool did not provide adequate coverage during TIN creation for the single sub-basin. PMP depths utilized for Chatuge are based on QGIS analysis to eliminate results without the complete PMP coverage. Since QGIS is used to verify the results of ArcGIS and their results are dissimilar for Chatuge, it is not clear what the basis is for using the output of QGIS instead of ArcGIS for this area. In addition, since the TVA determined that ArcGIS did not provide adequate coverage for Chutage, it is not clear how the output of QGIS is determined to be correct for this area. Therefore, the NRC staff requests TVA to justify the use of the QGIS output for the Chatuge sub-basin.
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TVA Response to NRC Question 1.2 l 9 Alternate calculation check of ArcGIS calculations in QGIS led to additional review of results Review showed Triangulation in ArcGIS had an area of 0.88 square-miles less than QGIS, equating to less than 0.5% of the total 189.1-sq.-mi. Chatuge basin area without TIN coverage The alternate calculation check in QGIS via the alternate methodology ensures full coverage of PMP depth data points over the basin by use of the QGIS resample tool to provide a grid of PMP depths at a 0.0025 by 0.0025 decimal degree grid Minor Lack of Coverage
TVA Response to NRC Question 1.2 l 10 Over 2,500 individual PMP surfaces were checked in QGIS with only those surfaces associated with a Chatuge PMP resulting in differences greater than 0.6% for the Chatuge sub-basin average.
Application of the adjacent grid point depths to the small uncovered area by the ArcGIS method result would approximate the QGIS result, providing the alternate calculation comparison and justification of the QGIS result for the Chatuge basin
Schedule for Submittal l 11 NRC Requested that TVA respond to the RAI within 45 days TVA plans to submit the RAI response no later than August 14, 2020 NRC is expected to approve the LAR by February 2022