Letter Sequence Other |
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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) (Open) |
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MONTHYEARCNL-19-066, Application to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, (TS-19-02)2020-01-14014 January 2020 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 2020-07-16
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Category:E-Mail
MONTHYEARML24032A0202024-01-31031 January 2024 NPDES Biocide/Corrosion Treatment Plan Annual Report, Cy 2023 ML23319A1662023-11-0202 November 2023 NRR E-mail Capture - Acceptance Review Results for Browns Ferry Nuclear Plant, Sequoyah Nuclear Plant, and Watts Bar Nuclear Plant, Exemption Request Related to 10 CFR 37.11(c)(2) ML23275A0272023-09-29029 September 2023 Submittal of Discharge Monitoring Report (DMR) Quality Assurance Study 43 Final Report 2023 ML23236A2562023-08-24024 August 2023 NRR E-mail Capture - Acceptance Review Results for the Sequoyah and Watts Bar License Amendment Request to Adopt TSTF-567 (L-2023-LLA-0106) ML23165A2862023-06-14014 June 2023 Tennessee Multi-Sector Permit (Tmsp), 2023 Annual Discharge Monitoring Report for Outfalls SW-1, SW-16, SW-17, SW-18, SW-19, and SW-21 ML23072A0722023-03-10010 March 2023 NRR E-mail Capture - (External_Sender) State Consultation - Sequoyah Nuclear Plant, Units 1 and 2; and Watts Bar Nuclear Plant, Units 1 and 2, License Amendment Request to Revise Technical Specification 3.4.12 (L-2022-LLA-0103) ML23058A1312023-02-27027 February 2023 FW: TVA Intentions on EA-22-129 ML23062A5952023-02-27027 February 2023 Staff follow-up Questions to Tva'S 12/19/2022 Response of the Staff'S Rsi Regarding 08/04/2022 SQN Exemption Request ML23052A0792023-02-21021 February 2023 NRR E-mail Capture - Acceptance Review for Browns Ferry and Sequoyah License Amendment Request to Adopt TSTF-541 ML23046A3552023-02-15015 February 2023 Annual Water Withdrawal Report 2022 ML23019A3442023-01-19019 January 2023 Tennessee Multi-Sector Permit (Tmsp), 2022 Annual Discharge Monitoring Report for Outfalls SW-1, SW-16, and SW-19 ML23013A0362023-01-12012 January 2023 NRR E-mail Capture - (External_Sender) State Consultation for Alabama - Browns Ferry, Units 1, 2 and 3; Sequoyah, Units 1 and 2; and Watts Bar, Units 1 and 2, License Amendment Request to Adopt TSTF-554-A, Revision 1 (L-2022-LLA-0100) ML23013A0382023-01-12012 January 2023 NRR E-mail Capture - (External_Sender) State Consultation for Alabama - Browns Ferry, Units 1, 2 and 3; Sequoyah, Units 1 and 2; and Watts Bar, Units 1 and 2, License Amendment Request to Adopt TSTF-529, Revision 4 (L-2022-LLA-0088) ML23026A0282023-01-12012 January 2023 001 Radiation Safety Baseline Inspection Information Request ML22348A0972022-12-14014 December 2022 NRR E-mail Capture - State Consultation - Browns Ferry, Units 1, 2 and 3; Sequoyah, Units 1 and 2; and Watts Bar, Units 1 and 2, License Amendment Request to Adopt TSTF-529, Revision 4 (L-2022-LLA-0088) ML22348A0442022-12-13013 December 2022 NRR E-mail Capture - State Consultation - Browns Ferry, Units 1, 2 and 3; Sequoyah, Units 1 and 2; and Watts Bar, Units 1 and 2, License Amendment Request to Adopt TSTF-554-A, Revision 1 (L-2022-LLA-0100) ML22343A0692022-12-0808 December 2022 NRR E-mail Capture - Request for Additional Information - Sequoyah Nuclear Plant, Units 1 and 2, and Watts Bar Nuclear Plant, Units 1 and 2, License Amendment Request to Revise Technical Specification 3.4.12 (L-2022-LLA-0103) ML22348A0432022-11-28028 November 2022 NRR E-mail Capture - State Consultation - Sequoyah Nuclear Plant, Units 1 and 2, License Amendment Request to Modify the Approved 10 CFR 50.69 Categorization Process (L-2022-LLA-0033) ML22227A0712022-08-15015 August 2022 NRR E-mail Capture - Acceptance Review Results for Sequoyah and Watts Bar License Amendment Request to Revise TS 3.4.12 (EPID L-2022-LLA-0103) - Corrected ML22227A0262022-08-12012 August 2022 NRR E-mail Capture - Acceptance Review Results for Sequoyah and Watts Bar License Amendment Request to Revise TS 3.4.12 ML22227A0272022-08-11011 August 2022 NRR E-mail Capture - Request for Additional Information Related to Alternative Requests RP-11 for Sequoyah Nuclear Plant, Units 1 and 2, and IST-RR-9 for Watts Bar Nuclear Plant, Units 1 and 2 ML22215A2752022-08-0303 August 2022 NRR E-mail Capture - Acceptance Review Results for TVA Fleet License Amendment Request to Adopt TSTF-554 ML22214A1582022-08-0202 August 2022 NRR E-mail Capture - Request for Additional Information for Sequoyah Units 1 and 2 License Amendment Request for Fire and Seismic PRA Modification to 10 CFR 50.69 (L-2022-LLA-0033) ML22196A0732022-07-15015 July 2022 NRR E-mail Capture - (External_Sender) State Notification for Sequoyah Units 1 and 2 Amendment Issuance - TSTF-505 RICT (L-2021-LLA-0145) ML22194A8762022-07-13013 July 2022 NRR E-mail Capture - Acceptance Review Results for TVA Fleet License Amendment Request to Adopt TSTF-529 ML22173A0332022-06-17017 June 2022 NRR E-mail Capture - (External_Sender) State Notification for Sequoyah Units 1 and 2 Amendment Issuance - Reactor Trip System Instrumentation (L-2021-LLA-0200) ML22166A4292022-06-0606 June 2022 NRR E-mail Capture - LAR to Adopt TSTF-577 ML22151A0102022-05-27027 May 2022 NRR E-mail Capture - Revised Request for Additional Information Re Sequoyah Nuclear Plant Alternative Request RV-02 ML22151A0092022-05-26026 May 2022 NRR E-mail Capture - Request for Additional Information Re Sequoyah Nuclear Plant Alternative Request RV-02 ML22146A3322022-05-26026 May 2022 NRR E-mail Capture - Request for Additional Information Related to Sequoyah Nuclear Plant'S LAR to Adopt TSTF-505 ML22146A3342022-05-25025 May 2022 NRR E-mail Capture - Acceptance Review Results for Browns Ferry Nuclear Plant, Units 1, 2, and 3, Sequoyah Nuclear Plant, Units 1 and 2, and Watts Bar Nuclear Plant, Units 1 and 2, Relief Requests (EPID L-2022-LLR-0045 - 0047) ML22137A2692022-05-17017 May 2022 Notice of Termination, TNR192066, Gravel Lot Restoration Project ML22136A0182022-05-16016 May 2022 NRR E-mail Capture - Acceptance Review Results for Sequoyah Nuclear Plant, Units 1 and 2, Alternative Request RP-11 and Watts Bar Nuclear Plant, Units 1 and 2, Alternative Request IST-RR-9 ML22144A1002022-05-12012 May 2022 NRR E-mail Capture - Request for Additional Information Related to Tva'S Request to Revised the TVA Plants' Radiological Emergency Plans ML22132A1762022-05-12012 May 2022 Tennessee Multi-Sector Permit (Tmsp), 2021 Annual Discharge Monitoring Report for Outfalls SW-2, SW-3, SW-4, SW-6, SW-8, SW-9, and SW-13 ML22123A1812022-05-0303 May 2022 NRR E-mail Capture - Acceptance Review Results for Sequoyah Nuclear Plant, Units 1 and 2, and Watts Bar Nuclear Plant, Units 1 and 2, License Amendment Request to Adopt TSTF-577 ML22095A0182022-04-0404 April 2022 NRR E-mail Capture - Sequoyah Nuclear Plant - Acceptance of Request for Alternative - Pressure Isolation Valve Leakage ISTC-3630 (L-2022-LLR-0034) ML22125A1422022-03-22022 March 2022 1 and 2 - March 22, 2022 e-mail - Sequoyah TSTF-505 LAR Supplemental Information ML22075A0942022-03-16016 March 2022 NRR E-mail Capture - Acceptance Review for Sequoyah Units 1 and 2 - LAR to Use of Fire and Seismic PRAs to Modify Approved 10 CFR 50.69 Categorization Process ML22046A2742022-02-15015 February 2022 NRR E-mail Capture - Audit Question (Snsb 02) for Sequoyah Units 1 and 2 LAR to Adopt TSTF-505, Revision 2 (L-2021-LLA-0145) ML22047A0552022-02-15015 February 2022 Annual Water Withdrawal Report 2021 ML22038A1882022-02-0404 February 2022 NRR E-mail Capture - Acceptance Review Results for TVA Fleet License Amendment Request to Revise the TVA Radiological Emergency Plan ML22035A0182022-02-0303 February 2022 NRR E-mail Capture - Audit Questions (Eeb follow-up) for Sequoyah Units 1 and 2 LAR to Adopt TSTF-505, Revision 2 (L-2021-LLA-0145) ML22018A0272022-01-18018 January 2022 2022 All RFI Responses - Exercise and Program Inspections - Revl ML21347A9022021-12-13013 December 2021 Discharge Monitoring Report (DMR) Quality Assurance Study 41 Follow-up Report 2021 ML21336A3942021-12-0101 December 2021 NRR E-mail Capture - Audit Questions for Sequoyah Units 1 and 2 - LAR to Adopt TSTF-505, Revision 2 (L-2021-LLA-0145) ML21323A0432021-11-18018 November 2021 NRR E-mail Capture - Acceptance Review for Sequoyah Units 1 and 2 - LAR to Eliminate the High Negative Flux Rate Trip Requirement ML21252A2152021-09-0909 September 2021 NRR E-mail Capture - Sequoyah Nuclear Plant, Unit 2 - Acceptance of Request for Alternative Inspection for Upper Head Injection J-groove Welds (L-2021-LLR-0059) ML21239A0712021-08-27027 August 2021 Acceptance of License Amendment Request to Adopt TSTF-505, Revision 2 ML21237A4952021-08-25025 August 2021 Document Request for Sequoyah Nuclear Plant - Radiation Protection Inspection - Inspection Report 2021-04 2024-01-31
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From: Wentzel, Michael Sent: Tuesday, November 10, 2020 9:40 AM To: Taylor, Andrew Charles Cc: Williams, Gordon Robert; Wells, Russell Douglas
Subject:
Sequoyah Nuclear Plant, Units 1 and 2 - Audit Plan and Setup of Online Reference Portal (EPID L-2020-LLA-0004)
Attachments: Redacted - Sequoyah 1 and 2 - Supplement to Audit Plan and Setup of Online Reference Portal (EPID L-2020-LLA-0004).pdf
Dear Mr. Taylor:
By application dated January 14, 2020, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20016A396); as supplemented by letters dated February 18, May 14, and August 12, 2020 (ADAMS Accession Nos. ML20049H184, ML20135H067, and ML20225A170, respectively); the Tennessee Valley Authority (TVA), submitted a license amendment request to revise the Sequoyah Nuclear Plant, Units 1 and 2, Updated Final Safety Analysis Report hydrologic analysis.
By email dated September 14, 2020 (ADAMS Accession No. ML20261H418), the U.S. Nuclear Regulatory Commission (NRC) staff issued a plan for the audit of information supporting the license amendment request. The NRC staff is issuing the attached supplement to that plan to include the review of information pertaining to TVAs software dedication process to the scope of the regulatory audit. As such, the NRC staff requests that the online reference portal be populated with the additional information identified in revised Section IV of the audit plan. The NRC staff may request additional documents during the review, which will be transmitted to you via email. The NRC staffs supplemental audit plan contains information that has been designated as proprietary. The redacted version of the supplemental audit plan is attached. The version containing proprietary information will be transmitted to you separately via an appropriate mechanism.
Related to the inclusion of information pertaining to TVAs software dedication process to the scope of the regulatory audit, TVAs August 12, 2020, letter stated its intent to provide the final response to the NRC staffs July 1, 2020, request for additional information (ADAMS Accession No. ML20189A211) at a later date agreed to by TVA and NRC. With the inclusion of this additional, related information to the scope of the regulatory audit, the NRC staff agrees that it would be appropriate for TVA to delay its response to the staffs request for additional information until a date to be agreed upon after the staff has had an opportunity to complete its audit activities.
If you have any questions, please contact me at (301) 415 6459 or michael.wentzel@nrc.gov.
Sincerely, Michael J. Wentzel, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
Hearing Identifier: NRR_DRMA Email Number: 880 Mail Envelope Properties (MN2PR09MB586777D5DA6E5751623454B1E7E90)
Subject:
Sequoyah Nuclear Plant, Units 1 and 2 - Audit Plan and Setup of Online Reference Portal (EPID L-2020-LLA-0004)
Sent Date: 11/10/2020 9:39:51 AM Received Date: 11/10/2020 9:39:51 AM From: Wentzel, Michael Created By: Michael.Wentzel@nrc.gov Recipients:
"Williams, Gordon Robert" <grwilliams1@tva.gov>
Tracking Status: None "Wells, Russell Douglas" <rdwells0@tva.gov>
Tracking Status: None "Taylor, Andrew Charles" <actaylor@tva.gov>
Tracking Status: None Post Office: MN2PR09MB5867.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 2412 11/10/2020 9:39:51 AM Redacted - Sequoyah 1 and 2 - Supplement to Audit Plan and Setup of Online Reference Portal (EPID L-2020-LLA-0004).pdf 70869 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
OFFICIAL USE ONLY PROPRIETARY INFORMATION SUPPLEMENT TO AUDIT PLAN REGARDING LICENSE AMENDMENT REQUEST TO REVISE UPDATED FINAL SAFETY ANALYSIS REPORT HYDROLOGIC ANALYSIS TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 I. BACKGROUND By application dated January 14, 2020 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20014353A016); as supplemented by letters dated February 18 May 14, and August 12, 2020 (ADAMS Accession Nos. ML20049H184 and ML20135H067, ML20225A170, respectively); the Tennessee Valley Authority (TVA; the licensee) submitted a license amendment request (LAR) for Sequoyah Nuclear Plant (Sequoyah), Units 1 and 2. The proposed amendments would revise the Sequoyah, Units 1 and 2, Updated Final Safety Analysis Report (UFSAR) to reflect the results from new hydrologic analysis performed by the licensee.
By email dated September 14, 2020 (ADAMS Accession No. ML20261H418), the U.S. Nuclear Regulatory Commission (NRC) staff issued its plan for audit of information that supports the LAR. On October 13, 2020 (ADAMS Accession No. ML20293A080), the NRC and TVA staff participated in a closed meeting to discuss responses to NRC requests for additional information pertaining to the software dedication process used support the LAR. Based on that meeting, the NRC staff has determined that expanding the audit to include information associated with the software dedication process would be the most efficient approach toward a timely resolution of questions associated with this LAR review and will allow the NRC staff to confirm that the analyses, validation tests to support software dedication, and references support the requested licensing action.
II. REVISIONS TO AFFECTED SECTIONS The revised sections of the NRC staffs September 14, 2020, audit plan are indicated, below:
IV. INFORMATION REQUEST Information Request (IR) 2.4-2: Software Quality Assurance and Documentation
- 1. Dedication of the Probable Maximum Precipitation (PMP) Evaluation Tool
- a. Documentation on the methodology, test cases, and test results to independently validate the output of the PMP Evaluation Tool.
OFFICIAL USE ONLY PROPRIETARY INFORMATION
OFFICIAL USE ONLY PROPRIETARY INFORMATION
- b. Documentation that provides basis to demonstrate that the test cases selected to validate the output of the PMP Evaluation Tool is sufficient to dedicate this tool for use in the intended application as described in the LAR.
- c. Information to respond to NRC staff questions related to the dedication and operation of the PMP Evaluation tool as described in Enclosure 1 of this audit plan.
IV. AUDIT TEAM Team Member Title Division Area of Responsibility Deanna Zhang Senior Reactor NRR/DRO/IQVB Technical Review Operations Engineer In addition, the NRC staffs September 14, 2020, audit plan is revised to include the following new section:
VII. AUDIT DISCUSSION TOPICS A. Discussion Topics Related to the Dedication and Intended Use of the Probable Maximum Precipitation (PMP) Evaluation Tool
- 1. As described in the LAR, Section 2.4.3.1, Probable Maximum Precipitation:
The updated PMP depth-area-duration [DAD] characteristics for three storm types at each point of a gridded network over the Tennessee River drainage basis for three storm types: local, general, and tropical.
The resolution of the PMP gridded network is 0.025 by 0.025 decimal degrees with each grid cell having an approximate area of 2.5-square miles for a total of 12,966 grid points above Wheeler dam. Gridded PMP values are calculated using the PMP Evaluation Tool, described in Topical Report TVA-NPG-AWA16-A and further described in Attachment A to this enclosure. This tool applies moisture transposition, in-place maximization, and orographic transposition adjustment factors to analyzed storm depth-area-duration value for the PMP area size and duration of interest to yield an adjusted rainfall value at a single grid point location... This process is repeated for each grid point on the gridded network within the PMP area of interest to determine the final point PMP rainfall depths.
((
))
- a. Clarify the difference between (1) test area sizes, (2) DAD data area sizes, and (3) watershed area sizes and how they are related.
OFFICIAL USE ONLY PROPRIETARY INFORMATION
OFFICIAL USE ONLY PROPRIETARY INFORMATION
- b. How do the test problems with area sizes between values in DAD tables provide basis for validating the functions of the PMP Evaluation Tool for basins of interest in the TVA project?
- 2. As described in the LAR, Section 2.4.2.3 Effects of Local Intense Precipitation, PMP for the plant drainage system and roofs of safety-related structures is defined in Topical Report TVA-NPG-AWA16-A[and] would produce a maximum one-hour depth of 13.8 inches.
Section 3.7 of the NRC staffs safety evaluation associated with the Topical Report states that While the local PMP provides localized, small-scale PMP estimates across the TVA Basin, nearly all data provided is outside the scope of the NRC's review, as stated in Section 3.0; instead, the LIP depths provide site-specific calculations relevant for on-site flooding at each of TVA's three operating nuclear power plants which may result from LIP [local intense precipitation] over the powerblock. The final 1-hour, 1-mi2 [1-square mile] LIP depths were 11.60, 13.81, and 13.81 inches at BFN [Browns Ferry Nuclear Plant, Units 1, 2, and 3],
WBN [Watts Bar Nuclear Plant, Units 1 and 2], and SQN [Sequoyah],
respectively.
- a. Given the limitations and conditions of the Topical Report and since site-specific LIP calculations were used in place of local PMP data, clarify whether application of the PMP Evaluation Tool Package for local type events should be considered within the scope of the NRC staffs software dedication audit since local PMP data were outside the scope of the NRC staffs Topical Report review.
OFFICIAL USE ONLY PROPRIETARY INFORMATION