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| | issue date = 01/29/2010 | | | issue date = 01/29/2010 |
| | title = Letter from J. Giitter, NRR to D. Baxter, Duke Energy on Evaluation of Duke Energy Carolinas, November 30, 2009, Response to NRC Letter Dated April 30, 2009, Related to Oconee | | | title = Letter from J. Giitter, NRR to D. Baxter, Duke Energy on Evaluation of Duke Energy Carolinas, November 30, 2009, Response to NRC Letter Dated April 30, 2009, Related to Oconee |
| | author name = Giitter J G | | | author name = Giitter J |
| | author affiliation = NRC/NRR/DORL | | | author affiliation = NRC/NRR/DORL |
| | addressee name = Baxter D | | | addressee name = Baxter D |
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| =Text= | | =Text= |
| {{#Wiki_filter:O.IILUFQLYSCJIVRLAE | | {{#Wiki_filter:O.IILUFQLYSCJIVRLAE !oM7~ |
| !oM7~January 29, 2010 Mr. Dave Baxter Vice President, Oconee Site Duke Energy Carolinas, LLC 7800 Rochester Highway Seneca, SC 29672 | | January 29, 2010 Mr. Dave Baxter Vice President, Oconee Site Duke Energy Carolinas, LLC 7800 Rochester Highway Seneca, SC 29672 |
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| ==SUBJECT:== | | ==SUBJECT:== |
| EVALUATION OF DUKE ENERGY CAROLINAS, LLC (DUKE), NOVEMBER 30, 2009, RESPONSE TO NUCLEAR REGULATORY COMMISSION (NRC) LETTER DATED APRIL 30, 2009, RELATED TO EXTERNAL FLOODING AT OCONEE NUCLEAR STATION, UNITS 1,2, AND 3 (OCONEE)(TAC NOS. ME3065, ME3066, AND ME3067) | | EVALUATION OF DUKE ENERGY CAROLINAS, LLC (DUKE), NOVEMBER 30, 2009, RESPONSE TO NUCLEAR REGULATORY COMMISSION (NRC) LETTER DATED APRIL 30, 2009, RELATED TO EXTERNAL FLOODING AT OCONEE NUCLEAR STATION, UNITS 1,2, AND 3 (OCONEE) |
| | (TAC NOS. ME3065, ME3066, AND ME3067) |
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| ==Dear Mr. Baxter:== | | ==Dear Mr. Baxter:== |
| On August 15, 2008, the Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Section 50.54(f), regarding the protection against external flooding at Oconee, including the potential failure of the Jocassee Dam. Duke responded to the NRC letter on September 26, 2008. The NRC staff reviewed the letter and found that Duke had not provided sufficient information to demonstrate that Oconee will be adequately protected from external flooding events. Subsequently, on April 30, 2009, the NRC issued a letter to Duke requesting additional information (RAI) to demonstrate that Oconee will be adequately protected from external flooding events. In the April 30, 2009, letter, the NRC requested that Duke provide analyses which would establish an adequate licensing basis for external flooding at Oconee by November 2009, including a schedule for any site modifications necessary to mitigate an external flooding event.Several closed meetings and telephone conference calls have taken place in order for the NRC staff to obtain a better understanding of the technical issues. By letter dated November 30, 2009, Duke provided a response to the NRC April 30, 2009, letter. Based on a preliminary review of the November 30, 2009, letter, the NRC staff determined that although Duke provided a more accurate estimate of the flooding caused by a failure of the Jocassee Dam, the NRC staff finds that additional information is needed. This information is necessary for the NRC staff to determine if the analyses performed to date will demonstrate, for the entire Jocassee earthen works, that the Oconee site will be adequately protected from external flooding events. Enclosed is a set of RAIs. These RAIs have been discussed with members of your staff on December 10, 2009, and January 21, 2010. The NRC requests that Duke provide a response to the RAIs within 30 days of receipt of this letter. If Duke cannot provide the information requested within 30 days, please notify the NRC in writing within 5 days of receipt of this letter.L MITED ERNAL &FONLY -S RMATI b-Df Bate -SU-2-D. Baxter By letter dated January 15, 2010, Duke submitted a letter to the NRC which provided its interim compensatory measures (ICMs) to ensure that the Oconee site will be adequately protected from external flooding events until the final mitigating strategies have been implemented and all site modifications have been completed. | | |
| The NRC staff will perform a further review of the ICMs, and will perform a future inspection. | | On August 15, 2008, the Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 10 of the Code of FederalRegulations (10 CFR), Part 50, Section 50.54(f), |
| In the interim, the NRC staff requests that Duke implement the ICMs and keep them in place until such time that this safety issue is resolved.The NRC stated in its April 30, 2009, letter, that there was not an immediate need to modify, suspend or revoke the Oconee licenses. | | regarding the protection against external flooding at Oconee, including the potential failure of the Jocassee Dam. Duke responded to the NRC letter on September 26, 2008. The NRC staff reviewed the letter and found that Duke had not provided sufficient information to demonstrate that Oconee will be adequately protected from external flooding events. Subsequently, on April 30, 2009, the NRC issued a letter to Duke requesting additional information (RAI) to demonstrate that Oconee will be adequately protected from external flooding events. In the April 30, 2009, letter, the NRC requested that Duke provide analyses which would establish an adequate licensing basis for external flooding at Oconee by November 2009, including a schedule for any site modifications necessary to mitigate an external flooding event. |
| The NRC staff continues to believe that there is no immediate need to take such actions, as long as the ICMs are effectively maintained at the Oconee site and Duke can provide adequate information responsive to the NRC's request in a timely manner. Should Duke not be able to maintain the ICMs or provide adequate information in a timely manner, the NRC will consider taking further regulatory action.In responding to the enclosed RAIs, please take the appropriate measures in the development and handling of information regarding this issue, including consideration of the provisions of 10 CFR 2.390(d)(1). | | Several closed meetings and telephone conference calls have taken place in order for the NRC staff to obtain a better understanding of the technical issues. By letter dated November 30, 2009, Duke provided a response to the NRC April 30, 2009, letter. Based on a preliminary review of the November 30, 2009, letter, the NRC staff determined that although Duke provided a more accurate estimate of the flooding caused by a failure of the Jocassee Dam, the NRC staff finds that additional information is needed. This information is necessary for the NRC staff to determine ifthe analyses performed to date will demonstrate, for the entire Jocassee earthen works, that the Oconee site will be adequately protected from external flooding events. Enclosed is a set of RAIs. These RAIs have been discussed with members of your staff on December 10, 2009, and January 21, 2010. The NRC requests that Duke provide a response to the RAIs within 30 days of receipt of this letter. If Duke cannot provide the information requested within 30 days, please notify the NRC in writing within 5 days of receipt of this letter. |
| If safeguards information is necessary to provide an acceptable response, please provide the level of protection described in 10 CFR 73.21.If you have any questions on this matter, please contact John Stang of my staff at 301-415-1345. | | L MITED ERNAL & |
| Sincerely, IRA!Joseph G. Guitter, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287 | | FONLY - S RMATI b-Df Bate -SU D. Baxter By letter dated January 15, 2010, Duke submitted a letter to the NRC which provided its interim compensatory measures (ICMs) to ensure that the Oconee site will be adequately protected from external flooding events until the final mitigating strategies have been implemented and all site modifications have been completed. The NRC staff will perform a further review of the ICMs, and will perform a future inspection. In the interim, the NRC staff requests that Duke implement the ICMs and keep them in place until such time that this safety issue is resolved. |
| | The NRC stated in its April 30, 2009, letter, that there was not an immediate need to modify, suspend or revoke the Oconee licenses. The NRC staff continues to believe that there is no immediate need to take such actions, as long as the ICMs are effectively maintained at the Oconee site and Duke can provide adequate information responsive to the NRC's request in a timely manner. Should Duke not be able to maintain the ICMs or provide adequate information in a timely manner, the NRC will consider taking further regulatory action. |
| | In responding to the enclosed RAIs, please take the appropriate measures in the development and handling of information regarding this issue, including consideration of the provisions of 10 CFR 2.390(d)(1). If safeguards information is necessary to provide an acceptable response, please provide the level of protection described in 10 CFR 73.21. |
| | If you have any questions on this matter, please contact John Stang of my staff at 301-415-1345. |
| | Sincerely, IRA! |
| | Joseph G. Guitter, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287 |
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| ==Enclosure:== | | ==Enclosure:== |
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| RAIs--OkFl ýALO VY ý-CU RY- AT I N ýFMýI Oý | | RAIs |
| | -- OkFl ýALO VYý-CU RY- AT IýFMýI N Oý |
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| A L U O -ý -ýE ED I TIO0 REQUEST FOR ADDITIONAL INFORMATION (RAI)OCONEE NUCLEAR STATION, UNITS 1. 2. AND 3 (OCONEE)RELATED TO EXTERNAL FLOODING AT OCONEE Based on an assessment of Duke's November 30, 2009, letter, the Nuclear Regulatory Commission (NRC) staff has identified that additional information is needed in order to have reasonable assurance that the parameters and sensitivity analyses adequately identify the amount of water that could result at the site due to a potential external flooding event. The NRC staff believes that the issues identified below could potentially impact the flood level at the Oconee site.1. Justify the assumptions used for parameters (breach dimension, breach time, and breach location) associated with the Jocassee Dam, Keowee Main Dam, Keowee West Saddle Dam, Intake Dike, and the Little River Dam. Also include the assumptions associated with the operation and capacity of the turbines and discharge gates for the Jocassee Dam. Specifically, describe how the values selected for each parameter represent a conservative value.2. Justify the use of the different Manning "n" values for the following areas: Little River Basin below the channel, the Keowee River below the Jocassee tailrace, and in the Keowee tailrace extension to the road bridge. Specifically, describe how the "n" values selected represent a conservative value.(b)(7)(F)4. The 2-dimensional (2D) model shows a second surge of water at the Oconee site due to a backup of water from the Keowee tailrace.
| | ýO* AL U O -ý - ýE ED I TIO0 REQUEST FOR ADDITIONAL INFORMATION (RAI) |
| Describe the effect of the overall water level at the Oconee site, following a faster breach time of the Keowee Dam.5. Organize the final runs such that the set of parameters that provides the highest water level for each point of interest (flood barrier, standby shutdown facility, any other necessary points of personnel ingress, etc.) can be identified and evaluated, with reasonable conservatism. | | OCONEE NUCLEAR STATION, UNITS 1. 2. AND 3 (OCONEE) |
| : 6. Provide the key for your runs associated with the sensitivity analysis for the Hydrologic Engineering Center -River Analysis System (HEC-RAS) model.7. Provide a copy of the final HEC-RAS models and 2D models that were used for the runs to justify the proposed modifications that will be made to protect the Oconee site from external flooding.8. Provide a copy of the topology associated with the area below Keowee Dam and around the Oconee site, yard, and switchyard. | | RELATED TO EXTERNAL FLOODING AT OCONEE Based on an assessment of Duke's November 30, 2009, letter, the Nuclear Regulatory Commission (NRC) staff has identified that additional information is needed in order to have reasonable assurance that the parameters and sensitivity analyses adequately identify the amount of water that could result at the site due to a potential external flooding event. The NRC staff believes that the issues identified below could potentially impact the flood level at the Oconee site. |
| Enclosure'1r:IC i US ii ON I- C ELA T4" OIAIOP}} | | : 1. Justify the assumptions used for parameters (breach dimension, breach time, and breach location) associated with the Jocassee Dam, Keowee Main Dam, Keowee West Saddle Dam, Intake Dike, and the Little River Dam. Also include the assumptions associated with the operation and capacity of the turbines and discharge gates for the Jocassee Dam. Specifically, describe how the values selected for each parameter represent a conservative value. |
| | : 2. Justify the use of the different Manning "n" values for the following areas: Little River Basin below the channel, the Keowee River below the Jocassee tailrace, and in the Keowee tailrace extension to the road bridge. Specifically, describe how the "n" values selected represent a conservative value. |
| | (b)(7)(F) |
| | : 4. The 2-dimensional (2D) model shows a second surge of water at the Oconee site due to a backup of water from the Keowee tailrace. Describe the effect of the overall water level at the Oconee site, following a faster breach time of the Keowee Dam. |
| | : 5. Organize the final runs such that the set of parameters that provides the highest water level for each point of interest (flood barrier, standby shutdown facility, any other necessary points of personnel ingress, etc.) can be identified and evaluated, with reasonable conservatism. |
| | : 6. Provide the key for your runs associated with the sensitivity analysis for the Hydrologic Engineering Center - River Analysis System (HEC-RAS) model. |
| | : 7. Provide a copy of the final HEC-RAS models and 2D models that were used for the runs to justify the proposed modifications that will be made to protect the Oconee site from external flooding. |
| | : 8. Provide a copy of the topology associated with the area below Keowee Dam and around the Oconee site, yard, and switchyard. |
| | Enclosure |
| | '1r:IC US i ONii I- C ELA T4" OIAIOP}} |
Letter Sequence Other |
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|
MONTHYEARML1001500662010-01-11011 January 2010
Request for Additional Information Regarding the Oconee External Flooding Issue
Project stage: RAI
ML1002715912010-01-29029 January 2010
Evaluation of Duke Energy Carolina, LLC (Duke), November 30, 2009, Response to Nuclear Regulatory Commission (NRC) Letter Dated April 30, 2009, Related to External Flooding at Oconee Nuclear Station, Units 1, 2, and 3 (Oconee)
Project stage: Other
ML12363A0852010-01-29029 January 2010
Letter from J. Giitter, NRR to D. Baxter, Duke Energy on Evaluation of Duke Energy Carolinas, November 30, 2009, Response to NRC Letter Dated April 30, 2009, Related to Oconee
Project stage: Other
ML1004700532010-02-0808 February 2010
External Flood, Response to Request for Additional Information
Project stage: Response to RAI
ML12363A0862010-06-22022 June 2010
CAL 2-10-003 - Confirmatory Action Letter- Oconee Nuclear Station, Units 1,2 and 3 Commitments to Address External Flooding Concerns (TAC Nos. ME3065, ME3066 and ME3067
Project stage: Other
ML1018908032010-07-26026 July 2010
Summary of Closed Meeting with Duke Energy Carolinas, LLC, to Discuss External Flooding at Oconee
Project stage: Meeting
ML1021700062010-08-0202 August 2010
Response to Confirmatory Action Letter (CAL) 2-10-003
Project stage: Request
ML1102801532011-01-28028 January 2011
Staff Assessment of Duke'S Response to Confirmatory Action Letter Regarding Duke'S Commitments to Address External Flooding Concerns at the Oconee Nuclear Station, Units 1, 2, and 3 (ONS)
Project stage: Other
ML1102604432011-01-28028 January 2011
Non-concurrence on Oconee Assessment Letter
Project stage: Other
2010-06-22
[Table View] |
Letter from J. Giitter, NRR to D. Baxter, Duke Energy on Evaluation of Duke Energy Carolinas, November 30, 2009, Response to NRC Letter Dated April 30, 2009, Related to Oconee| ML12363A085 |
| Person / Time |
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| Site: |
Oconee  |
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| Issue date: |
01/29/2010 |
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| From: |
Giitter J
Division of Operating Reactor Licensing |
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| To: |
Baxter D
Duke Energy Carolinas |
|---|
| References |
|---|
| TAC ME3065, TAC ME3066, TAC ME3067, FOIA/PA-2012-0128 |
| Download: ML12363A085 (4) |
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[Table view]
Category:Request for Additional Information (RAI)
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Notification of Inspection and Request for Information
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Audit Summary and RAI-RCI - Revised Enclosure
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002 Radiation Safety Baseline Inspection Information Request
ML23086C0362023-03-27027 March 2023
Request for Additional Information Steam Generator Tube Inspection Report (03R31)
ML23039A1632023-02-0808 February 2023
Requalification Program Inspection
ML23038A1832023-02-0707 February 2023
Request for Additional Information Alternative Request (RA-22-0174) to Use ASME Code Case N-752
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402 Cyber Notification and RFI Letter Final
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SLRA - Feedback for RAI B2.1.7-4a to Duke - August 16, 2022
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NRR E-mail Capture - Duke Common EOF Relocation - Request for Addition Information
ML22112A0072022-04-20020 April 2022
Email from Marieliz Johnson (NRC) to Steve Snider (Duke) - Oconee SLRA - Request for Confirmation of Information 3.5.2.2.2.6-L
ML22113A0092022-04-20020 April 2022
Attachment: Oconee SLRA - Final RAI 3.1.2-1
ML22081A0062022-03-21021 March 2022
Attachment: Oconee SLRA - 2nd Round RAI B4.1-3
ML22081A0052022-03-21021 March 2022
Email from Angela Wu (NRC) to Steve Snider (Duke) - Oconee SLRA - 2nd Round RAI B4.1-3
ML22080A0772022-03-16016 March 2022
SLRA - RAI Set 4 (2nd Round Rais)
ML22069A0012022-03-0808 March 2022
Attachment: Oconee SLRA - Final Requests for Confirmation of Information - Set 4
ML22063A4502022-03-0404 March 2022
Request for Additional Information Application to Revise TS 3.7.7, Low Pressure Service Water (LPSW) System, to Extend the Completion Time for One Required Inoperable LPSW Pump
RA-22-0036, Responses to NRC Request for Additional Information Set 22022-02-14014 February 2022
Responses to NRC Request for Additional Information Set 2
ML22019A1032022-01-18018 January 2022
Email from Angela Wu (NRC) to Steve Snider (Duke) - Oconee SLRA - Requests for Additional Information - Set 3
ML22019A2442022-01-18018 January 2022
Notification of an NRC Fire Protection Team Inspection (FPTI) (NRC Inspection Report 05000269/2022010, 05000270/2022010, 05000287/2022010) and Request for Information (RFI)
ML22019A1042022-01-18018 January 2022
Attachment: Oconee SLRA - Final Requests for Additional Information - Set 3
ML22012A0422022-01-11011 January 2022
SLRA - Final Requests for Additional Information - Set 2
ML22010A1132022-01-0505 January 2022
SLRA - RCIs - Set 3
ML21333A0392021-11-29029 November 2021
RP Inspection Document Request
ML21327A2782021-11-23023 November 2021
Email from Angela Wu (NRC) to Steve Snider (Duke) - Oconee SLRA - Final RAIs (Set 1 and 2nd Round RAI B2.1.27-1a)
ML21327A2792021-11-23023 November 2021
SLRA - Final Requests for Additional Information - Set 1
ML21327A2802021-11-23023 November 2021
SLRA - Final 2nd Round RAI - RAI B2.1.27-1a
ML21330A0192021-11-23023 November 2021
Attachment: Oconee SLRA - Final Requests for Confirmation of Information - Set 2
ML21313A2342021-11-0404 November 2021
Attachment: Oconee SLRA - Final Requests for Confirmation of Information - Set 1
ML21274A0682021-10-0101 October 2021
Request for Additional Information Alternative Request (RA-20-0334) Regarding Use of an Alternative to the ASME Code Case N-853 Acceptance Criteria
ML21273A0492021-09-30030 September 2021
Request for Additional Information Alternative Request (ON-RPI-OMN-28) to Use Code Case OMN-28
ML21271A5892021-09-28028 September 2021
SLRA - RAI B2.1.27-1 (Draft)
ML21271A5902021-09-28028 September 2021
SLRA - RAI B2.1.27-1 (Final)
ML21271A5882021-09-22022 September 2021
SLRA - Request for Additional Information B2.1.27-1 - Email from Angela Wu (NRC) to Steve Snider (Duke)
ML21217A1912021-08-0505 August 2021
Request for Additional Information Alternative Request (RA-20-0334) Regarding Use of an Alternative to the ASME Code Case N-853 Acceptance Criteria
2024-07-05
[Table view] |
Text
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January 29, 2010 Mr. Dave Baxter Vice President, Oconee Site Duke Energy Carolinas, LLC 7800 Rochester Highway Seneca, SC 29672
SUBJECT:
EVALUATION OF DUKE ENERGY CAROLINAS, LLC (DUKE), NOVEMBER 30, 2009, RESPONSE TO NUCLEAR REGULATORY COMMISSION (NRC) LETTER DATED APRIL 30, 2009, RELATED TO EXTERNAL FLOODING AT OCONEE NUCLEAR STATION, UNITS 1,2, AND 3 (OCONEE)
(TAC NOS. ME3065, ME3066, AND ME3067)
Dear Mr. Baxter:
On August 15, 2008, the Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 10 of the Code of FederalRegulations (10 CFR), Part 50, Section 50.54(f),
regarding the protection against external flooding at Oconee, including the potential failure of the Jocassee Dam. Duke responded to the NRC letter on September 26, 2008. The NRC staff reviewed the letter and found that Duke had not provided sufficient information to demonstrate that Oconee will be adequately protected from external flooding events. Subsequently, on April 30, 2009, the NRC issued a letter to Duke requesting additional information (RAI) to demonstrate that Oconee will be adequately protected from external flooding events. In the April 30, 2009, letter, the NRC requested that Duke provide analyses which would establish an adequate licensing basis for external flooding at Oconee by November 2009, including a schedule for any site modifications necessary to mitigate an external flooding event.
Several closed meetings and telephone conference calls have taken place in order for the NRC staff to obtain a better understanding of the technical issues. By letter dated November 30, 2009, Duke provided a response to the NRC April 30, 2009, letter. Based on a preliminary review of the November 30, 2009, letter, the NRC staff determined that although Duke provided a more accurate estimate of the flooding caused by a failure of the Jocassee Dam, the NRC staff finds that additional information is needed. This information is necessary for the NRC staff to determine ifthe analyses performed to date will demonstrate, for the entire Jocassee earthen works, that the Oconee site will be adequately protected from external flooding events. Enclosed is a set of RAIs. These RAIs have been discussed with members of your staff on December 10, 2009, and January 21, 2010. The NRC requests that Duke provide a response to the RAIs within 30 days of receipt of this letter. If Duke cannot provide the information requested within 30 days, please notify the NRC in writing within 5 days of receipt of this letter.
L MITED ERNAL &
FONLY - S RMATI b-Df Bate -SU D. Baxter By letter dated January 15, 2010, Duke submitted a letter to the NRC which provided its interim compensatory measures (ICMs) to ensure that the Oconee site will be adequately protected from external flooding events until the final mitigating strategies have been implemented and all site modifications have been completed. The NRC staff will perform a further review of the ICMs, and will perform a future inspection. In the interim, the NRC staff requests that Duke implement the ICMs and keep them in place until such time that this safety issue is resolved.
The NRC stated in its April 30, 2009, letter, that there was not an immediate need to modify, suspend or revoke the Oconee licenses. The NRC staff continues to believe that there is no immediate need to take such actions, as long as the ICMs are effectively maintained at the Oconee site and Duke can provide adequate information responsive to the NRC's request in a timely manner. Should Duke not be able to maintain the ICMs or provide adequate information in a timely manner, the NRC will consider taking further regulatory action.
In responding to the enclosed RAIs, please take the appropriate measures in the development and handling of information regarding this issue, including consideration of the provisions of 10 CFR 2.390(d)(1). If safeguards information is necessary to provide an acceptable response, please provide the level of protection described in 10 CFR 73.21.
If you have any questions on this matter, please contact John Stang of my staff at 301-415-1345.
Sincerely, IRA!
Joseph G. Guitter, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287
Enclosure:
RAIs
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ýO* AL U O -ý - ýE ED I TIO0 REQUEST FOR ADDITIONAL INFORMATION (RAI)
OCONEE NUCLEAR STATION, UNITS 1. 2. AND 3 (OCONEE)
RELATED TO EXTERNAL FLOODING AT OCONEE Based on an assessment of Duke's November 30, 2009, letter, the Nuclear Regulatory Commission (NRC) staff has identified that additional information is needed in order to have reasonable assurance that the parameters and sensitivity analyses adequately identify the amount of water that could result at the site due to a potential external flooding event. The NRC staff believes that the issues identified below could potentially impact the flood level at the Oconee site.
- 1. Justify the assumptions used for parameters (breach dimension, breach time, and breach location) associated with the Jocassee Dam, Keowee Main Dam, Keowee West Saddle Dam, Intake Dike, and the Little River Dam. Also include the assumptions associated with the operation and capacity of the turbines and discharge gates for the Jocassee Dam. Specifically, describe how the values selected for each parameter represent a conservative value.
- 2. Justify the use of the different Manning "n" values for the following areas: Little River Basin below the channel, the Keowee River below the Jocassee tailrace, and in the Keowee tailrace extension to the road bridge. Specifically, describe how the "n" values selected represent a conservative value.
(b)(7)(F)
- 4. The 2-dimensional (2D) model shows a second surge of water at the Oconee site due to a backup of water from the Keowee tailrace. Describe the effect of the overall water level at the Oconee site, following a faster breach time of the Keowee Dam.
- 5. Organize the final runs such that the set of parameters that provides the highest water level for each point of interest (flood barrier, standby shutdown facility, any other necessary points of personnel ingress, etc.) can be identified and evaluated, with reasonable conservatism.
- 6. Provide the key for your runs associated with the sensitivity analysis for the Hydrologic Engineering Center - River Analysis System (HEC-RAS) model.
- 7. Provide a copy of the final HEC-RAS models and 2D models that were used for the runs to justify the proposed modifications that will be made to protect the Oconee site from external flooding.
- 8. Provide a copy of the topology associated with the area below Keowee Dam and around the Oconee site, yard, and switchyard.
Enclosure
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