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| | number = ML071280126 | | | number = ML071280126 |
| | issue date = 05/30/2007 | | | issue date = 05/30/2007 |
| | title = Edwin I. Hatch Nuclear Plant, Units 1 and 2 Request for Additional Information the Revision of the Licensing and Design Basis with a Full Scope Implementation of an Alternative Source Term | | | title = Request for Additional Information the Revision of the Licensing and Design Basis with a Full Scope Implementation of an Alternative Source Term |
| | author name = Martin R E | | | author name = Martin R |
| | author affiliation = NRC/NRR/ADRO/DORL/LPLII-1 | | | author affiliation = NRC/NRR/ADRO/DORL/LPLII-1 |
| | addressee name = Madison D R | | | addressee name = Madison D |
| | addressee affiliation = Southern Nuclear Operating Co, Inc | | | addressee affiliation = Southern Nuclear Operating Co, Inc |
| | docket = 05000321, 05000366 | | | docket = 05000321, 05000366 |
| | license number = DPR-057, NPF-005 | | | license number = DPR-057, NPF-005 |
| | contact person = Martin R E, NRR/DORL, 415-1493 | | | contact person = Martin R, NRR/DORL, 415-1493 |
| | case reference number = TAC MD2934, TAC MD2935 | | | case reference number = TAC MD2934, TAC MD2935 |
| | document type = Letter, Request for Additional Information (RAI) | | | document type = Letter, Request for Additional Information (RAI) |
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| =Text= | | =Text= |
| {{#Wiki_filter:May 30, 2007Mr. Dennis R. MadisonVice President - Hatch Edwin I. Hatch Nuclear Plant 11028 Hatch Parkway North Baxley, GA 31513 | | {{#Wiki_filter:May 30, 2007 Mr. Dennis R. Madison Vice President - Hatch Edwin I. Hatch Nuclear Plant 11028 Hatch Parkway North Baxley, GA 31513 |
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| ==SUBJECT:== | | ==SUBJECT:== |
| EDWIN I. HATCH NUCLEAR PLANT, UNIT NOS. 1 AND 2 (HNP) - REQUESTFOR ADDITIONAL INFORMATION (RAI) REGARDING ALTERNATE SOURCE TERM APPLICATION (TAC NOS. MD2934 AND MD2935) | | EDWIN I. HATCH NUCLEAR PLANT, UNIT NOS. 1 AND 2 (HNP) - REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING ALTERNATE SOURCE TERM APPLICATION (TAC NOS. MD2934 AND MD2935) |
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| ==Dear Mr. Madison:== | | ==Dear Mr. Madison:== |
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| By letter to the U.S. Nuclear Regulatory Commission dated August 29, 2006, Southern NuclearOperating Company, Inc., proposed to revise the HNP, licensing and design basis with a full scope implementation of an alternative source term. We have reviewed your application and have identified a need for additional information on the meteorology of the site as set forth in the Enclosure. | | By letter to the U.S. Nuclear Regulatory Commission dated August 29, 2006, Southern Nuclear Operating Company, Inc., proposed to revise the HNP, licensing and design basis with a full scope implementation of an alternative source term. We have reviewed your application and have identified a need for additional information on the meteorology of the site as set forth in the Enclosure. |
| | | We discussed this issue with your staff on May 29, 2007. Your staff indicated that it plans to submit a response to this issue within sixty (60) days of receipt of this letter. |
| We discussed this issue with your staff on May 29, 2007. Your staff indicated that it plans to submit a response to this issue within sixty (60) days of receipt of this letter. Sincerely,/RA/Robert E. Martin, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket Nos. 50-321 and 50-366 | | Sincerely, |
| | /RA/ |
| | Robert E. Martin, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366 |
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| ==Enclosure:== | | ==Enclosure:== |
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| RAIcc w/encl: See next page
| | RAI cc w/encl: See next page |
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| - ML071280126 *transmitted by email datedOFFICENRR/LPL2-1/PMNRR/LPL2-1/LANRR/SCVB/BCNRR/LPL2-1/BCNAMERMartin:ncMO'BrienMHart by emailEMarinos DATE05/30/0705/14/0705/7/07*05/30/07 EnclosureREQUEST FOR ADDITIONAL INFORMATIONCONCERNING IMPLEMENTATION OF AN ALTERNATIVE SOURCE TERMFOR EDWIN I. HATCH NUCLEAR PLANT, UNIT NOS. 1 AND 2 (HNP)1.The Nuclear Regulatory Commission (NRC) staff estimated the following distribution ofatmospheric stability in the 1996 through 1998 hourly meteorological data files provided as Enclosure 3 to the November 6, 2006, submittal letter:StabilityCategoryABCDEFGFrequency Occurrence19.9%3.7%3.5%16.5%29.1%13.2%14.1%The frequency of category D appears to be considerably lower, and categories A, F andG higher, than generally observed for other sites with a 50-meter (m) temperature difference ( -T) interval. This distribution appears to be more similar to measurements made from a smaller -T interval or possibly a temperature sensor less than 10-m above the ground. Please confirm that the category distributions are estimated from -T measurements between the 60-m and 10-m levels and, if so, describe how the data were converted to represent measurements of C/100 meters. If these data are -T measurements made between the 60-m and 10-m levels, what factors contribute to the relatively low occurrence of category D and moderately frequent occurrences of the A, F and G stability category meteorological conditions at the HNP site?2.Wind speeds measured at the 10-m level from 1996 through 1998 appear to be lighterthan generally reported for other sites, than would be estimated by exponential extrapolation of the 60-m measurements to the 10-m level, and in comparison to the early 1970's data presented in Table 2.3-14 of the HNP Final Safety Analysis Report. | | - ML071280126 *transmitted by email dated OFFICE NRR/LPL2-1/PM NRR/LPL2-1/LA NRR/SCVB/BC NRR/LPL2-1/BC NAME RMartin:nc MOBrien MHart by email EMarinos DATE 05/30/07 05/14/07 05/7/07* 05/30/07 REQUEST FOR ADDITIONAL INFORMATION CONCERNING IMPLEMENTATION OF AN ALTERNATIVE SOURCE TERM FOR EDWIN I. HATCH NUCLEAR PLANT, UNIT NOS. 1 AND 2 (HNP) |
| | : 1. The Nuclear Regulatory Commission (NRC) staff estimated the following distribution of atmospheric stability in the 1996 through 1998 hourly meteorological data files provided as Enclosure 3 to the November 6, 2006, submittal letter: |
| | Stability A B C D E F G Category Frequency Occurrence 19.9% 3.7% 3.5% 16.5% 29.1% 13.2% 14.1% |
| | The frequency of category D appears to be considerably lower, and categories A, F and G higher, than generally observed for other sites with a 50-meter (m) temperature difference ( -T) interval. This distribution appears to be more similar to measurements made from a smaller -T interval or possibly a temperature sensor less than 10-m above the ground. Please confirm that the category distributions are estimated from -T measurements between the 60-m and 10-m levels and, if so, describe how the data were converted to represent measurements of C/100 meters. If these data are -T measurements made between the 60-m and 10-m levels, what factors contribute to the relatively low occurrence of category D and moderately frequent occurrences of the A, F and G stability category meteorological conditions at the HNP site? |
| | : 2. Wind speeds measured at the 10-m level from 1996 through 1998 appear to be lighter than generally reported for other sites, than would be estimated by exponential extrapolation of the 60-m measurements to the 10-m level, and in comparison to the early 1970's data presented in Table 2.3-14 of the HNP Final Safety Analysis Report. |
| NRC staff estimated the 5-percentile 1996 through 1998 10-m measured wind speed to be about 0.4 meters/second (m/s) while extrapolation of the 1996 through 1998 60-m winds result in a 5-percentile 10-m wind speed estimate slightly less than 1 m/s. | | NRC staff estimated the 5-percentile 1996 through 1998 10-m measured wind speed to be about 0.4 meters/second (m/s) while extrapolation of the 1996 through 1998 60-m winds result in a 5-percentile 10-m wind speed estimate slightly less than 1 m/s. |
| Further, the extrapolated 1970's data suggests a 10-m 5-percentile wind speed of approximately 0.7 m/s. Both the 1 m/s and 0.7 m/s estimates are more similar to the 5-percentile 10-m wind speeds reported at other sites. Do you agree that the 5-percentile 1996 through 1998 10-m wind speed measured at HNP was about 0.4 m/s? | | Further, the extrapolated 1970's data suggests a 10-m 5-percentile wind speed of approximately 0.7 m/s. Both the 1 m/s and 0.7 m/s estimates are more similar to the 5-percentile 10-m wind speeds reported at other sites. Do you agree that the 5-percentile 1996 through 1998 10-m wind speed measured at HNP was about 0.4 m/s? |
| If so, what factors contributed to these light winds?3.Figures 4 and 5 of Enclosure 1 to the November 6, 2006, submittal provide wind rosesof the 1996 through 1998 meteorological measurements. Calm winds are listed as having a frequency of occurrence of 0.95% at the 10-m level and 2.05% at the 60-m level. Are calms in this figure defined as winds less than one knot (nautical mile per hour) as suggested by the figure legends? If so, please confirm these estimates. | | If so, what factors contributed to these light winds? |
| Based upon the 1996 through 1998 hourly data, NRC staff estimated a frequency of approximately 10% for winds less than one knot at the10-m level and 1% for winds at the 60-m level.4.Do the control room atmospheric dispersion factors (/Q values) listed in the responseto NRC Question 1 of Enclosure 1 of the November 6, 2006, submittal include consideration of /Q values applicable to the main steamline break accident (MSLB) and scenarios involving a loss of offsite power and other single failure? Which /Q valueswere used to model unfiltered inleakage into the control room and what is the basis for their use?5.Please justify use of the 10-m and 60-m meteorological data to calculate the controlroom /Q values for postulated releases from the 101.7-m stack rather thanmeteorological data measured at the 10-m and 100-m levels. Regulatory Guide (RG) 1.194, "Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants," and NRC Regulatory Issue Summary 2006-04, "Experience with Implementation of Alternative Source Terms," recommend that if wind measurements are available at more than two elevations, the data at the height closest to the release height should be used when running the ARCON96 computer code. 6.NRC staff notes that there are no 0-0.5 hour fumigation /Q values explicitly given forpostulated releases from the Hatch stack to the exclusion area boundary (EAB) and low population zone (LPZ). RG 1.183, "Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors," states that fumigation should be considered where applicable for the EAB and LPZ. For the EAB, the assumed fumigation period should be timed to be included in the worst 2-hour exposure period. Do the elevated release 0-2 hour EAB and LPZ /Q values include fumigation? If not, why is fumigation considered inapplicable? | | : 3. Figures 4 and 5 of Enclosure 1 to the November 6, 2006, submittal provide wind roses of the 1996 through 1998 meteorological measurements. Calm winds are listed as having a frequency of occurrence of 0.95% at the 10-m level and 2.05% at the 60-m level. Are calms in this figure defined as winds less than one knot (nautical mile per hour) as suggested by the figure legends? If so, please confirm these estimates. |
| | Based upon the 1996 through 1998 hourly data, NRC staff estimated a frequency of approximately 10% for winds less than one knot at the10-m level and 1% for winds at the 60-m level. |
| | : 4. Do the control room atmospheric dispersion factors (/Q values) listed in the response to NRC Question 1 of Enclosure 1 of the November 6, 2006, submittal include consideration of /Q values applicable to the main steamline break accident (MSLB) and Enclosure |
| | |
| | scenarios involving a loss of offsite power and other single failure? Which /Q values were used to model unfiltered inleakage into the control room and what is the basis for their use? |
| | : 5. Please justify use of the 10-m and 60-m meteorological data to calculate the control room /Q values for postulated releases from the 101.7-m stack rather than meteorological data measured at the 10-m and 100-m levels. Regulatory Guide (RG) 1.194, "Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants," and NRC Regulatory Issue Summary 2006-04, "Experience with Implementation of Alternative Source Terms," recommend that if wind measurements are available at more than two elevations, the data at the height closest to the release height should be used when running the ARCON96 computer code. |
| | : 6. NRC staff notes that there are no 0-0.5 hour fumigation /Q values explicitly given for postulated releases from the Hatch stack to the exclusion area boundary (EAB) and low population zone (LPZ). RG 1.183, "Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors," states that fumigation should be considered where applicable for the EAB and LPZ. For the EAB, the assumed fumigation period should be timed to be included in the worst 2-hour exposure period. Do the elevated release 0-2 hour EAB and LPZ /Q values include fumigation? |
| | If not, why is fumigation considered inapplicable? |
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| Edwin I. Hatch Nuclear Plant, Units 1 & 2 cc: | | Edwin I. Hatch Nuclear Plant, Units 1 & 2 cc: |
| Laurence BergenOglethorpe Power Corporation 2100 E. Exchange Place P.O. Box 1349 Tucker, GA 30085-1349Mr. R. D. BakerManager - Licensing Southern Nuclear Operating Company, Inc. | | Laurence Bergen P.O. Box 1295 Oglethorpe Power Corporation Birmingham, AL 35201-1295 2100 E. Exchange Place P.O. Box 1349 General Manager Tucker, GA 30085-1349 Edwin I. Hatch Nuclear Plant Southern Nuclear Operating Company, Inc. |
| P.O. Box 1295 Birmingham, AL 35201-1295Resident InspectorPlant Hatch 11030 Hatch Parkway N. | | Mr. R. D. Baker U.S. Highway 1 North Manager - Licensing P.O. Box 2010 Southern Nuclear Operating Company, Inc. Baxley, GA 31515 P.O. Box 1295 Birmingham, AL 35201-1295 Mr. K. Rosanski Resident Manager Resident Inspector Oglethorpe Power Corporation Plant Hatch Edwin I. Hatch Nuclear Plant 11030 Hatch Parkway N. P.O. Box 2010 Baxley, GA 31531 Baxley, GA 31515 Harold Reheis, Director Department of Natural Resources 205 Butler Street, SE., Suite 1252 Atlanta, GA 30334 Steven M. Jackson Senior Engineer - Power Supply Municipal Electric Authority of Georgia 1470 Riveredge Parkway, NW Atlanta, GA 30328-4684 Mr. Reece McAlister Executive Secretary Georgia Public Service Commission 244 Washington St., SW Atlanta, GA 30334 Arthur H. Domby, Esq. |
| Baxley, GA 31531Harold Reheis, DirectorDepartment of Natural Resources 205 Butler Street, SE., Suite 1252 Atlanta, GA 30334Steven M. JacksonSenior Engineer - Power Supply Municipal Electric Authority of Georgia 1470 Riveredge Parkway, NW Atlanta, GA 30328-4684Mr. Reece McAlisterExecutive Secretary Georgia Public Service Commission 244 Washington St., SW Atlanta, GA 30334Arthur H. Domby, Esq.Troutman Sanders Nations Bank Plaza 600 Peachtree St, NE, Suite 5200 Atlanta, GA 30308-2216ChairmanAppling County Commissioners County Courthouse Baxley, GA 31513Mr. Jeffrey T. GasserExecutive Vice President Southern Nuclear Operating Company, Inc.P.O. Box 1295Birmingham, AL 35201-1295General ManagerEdwin I. Hatch Nuclear Plant Southern Nuclear Operating Company, Inc. | | Troutman Sanders Nations Bank Plaza 600 Peachtree St, NE, Suite 5200 Atlanta, GA 30308-2216 Chairman Appling County Commissioners County Courthouse Baxley, GA 31513 Mr. Jeffrey T. Gasser Executive Vice President Southern Nuclear Operating Company, Inc.}} |
| U.S. Highway 1 North P.O. Box 2010 Baxley, GA 31515Mr. K. RosanskiResident Manager Oglethorpe Power Corporation Edwin I. Hatch Nuclear Plant P.O. Box 2010 Baxley, GA 31515}}
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Letter Sequence RAI |
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MONTHYEARML0630700372006-11-14014 November 2006 Edwin I Hatch, Nuclear Plant Unit No. 1 & 2, Request for Additional Information for Alternate Source Term Review (TAC Nos. MD2934 & MD2935) Project stage: RAI ML0632800652006-11-14014 November 2006 Meeting Summary Handouts, Enclosure 2 (Tac Nos. MD2934 and MD2935) Project stage: Meeting ML0632401972006-12-11011 December 2006 Summary of November 14, 2006, Meeting with Southern Nuclear Operating Co., on Alternative Source Term Submittal Project stage: Meeting ML0704602852007-02-22022 February 2007 Request for Additional Information Regarding Alternate Source Term Application Project stage: RAI ML0706502982007-03-15015 March 2007 Edwin I Hatch Nuclear Plant, Units 1 and 2 (HNP) - Request for Additional Information Alternative Source Term Application Project stage: RAI ML0708902972007-04-10010 April 2007 RAI Regarding Alternative Source Term Application Project stage: RAI ML0710900392007-04-26026 April 2007 Request for Additional Information Alternate Source Term Application Project stage: RAI ML0710900572007-05-0808 May 2007 Request for Additional Information Alternate Source Term Application Project stage: RAI ML0712801262007-05-30030 May 2007 Request for Additional Information the Revision of the Licensing and Design Basis with a Full Scope Implementation of an Alternative Source Term Project stage: RAI ML0721904682007-08-16016 August 2007 Nos. Units 1 and 2, (Hnp), RAI, Request for Additional Information Regarding Alternate Source Term Application Project stage: RAI ML0726806972007-10-0303 October 2007 Request for Additional Information Regarding Alternate Source Term Application Project stage: RAI NL-07-1949, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Turbine Building Ventilation and Leakage Treatment Piping Seismic Evaluations2007-12-11011 December 2007 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Turbine Building Ventilation and Leakage Treatment Piping Seismic Evaluations Project stage: Response to RAI ML0800702622008-01-0909 January 2008 (Hnp), Request for Additional Information (RAI) Regarding Alternate Source Term Application Tac Nos. MD2934 and MD2935) Project stage: RAI ML0801100512008-01-30030 January 2008 Discussion of Review Schedule Regarding Alternate Source Term Application Project stage: Other NL-08-0035, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Unit 1 Main Steam Isolation Valve Alternate Leakage Treatment Seismic Evaluation2008-02-0404 February 2008 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Unit 1 Main Steam Isolation Valve Alternate Leakage Treatment Seismic Evaluation Project stage: Response to RAI ML0803801412008-02-13013 February 2008 E.I Hatch Nuclear Plant, Units 1 and 2 (Hnp), RAI Regarding Alternate Source Term Application Project stage: RAI NL-07-1389, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Radiological Consequences Analyses2008-02-25025 February 2008 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Radiological Consequences Analyses Project stage: Response to RAI NL-07-1532, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Turbine Building Ventilation and Standby Liquid Control Systems2008-02-27027 February 2008 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Turbine Building Ventilation and Standby Liquid Control Systems Project stage: Response to RAI NL-08-0351, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Power Sources for the Turbine Building Ventilation System2008-03-13013 March 2008 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Power Sources for the Turbine Building Ventilation System Project stage: Response to RAI NL-08-0524, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding Atmospheric Dispersion Factors2008-04-0101 April 2008 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding Atmospheric Dispersion Factors Project stage: Response to RAI NL-08-0634, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Radiological Consequences Analyses2008-05-0505 May 2008 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Radiological Consequences Analyses Project stage: Response to RAI ML0814201722008-05-30030 May 2008 Request for Additional Information Regarding Alternative Source Term Application Project stage: RAI NL-08-0903, Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Turbine Building Ventilation Exhaust System Fans2008-06-25025 June 2008 Request to Implement an Alternative Source Term Response to Request for Additional Information Regarding the Turbine Building Ventilation Exhaust System Fans Project stage: Response to RAI NL-08-1022, Request to Revise the Unit 1 and Unit 2 Operating Licenses to Extend the Interim Period for the Use of Potassium Iodide2008-07-0202 July 2008 Request to Revise the Unit 1 and Unit 2 Operating Licenses to Extend the Interim Period for the Use of Potassium Iodide Project stage: Request ML0819001752008-07-0909 July 2008 Request for Additional Information, Alternate Source Term Application Project stage: RAI ML0819003312008-07-14014 July 2008 Transmittal of Notice of Consideration of Issuance of Amendments for Alternate Source Term Application Project stage: Other ML0819003382008-07-14014 July 2008 Notice of Consideration of Issuance of Amendments for Alternate Source Term Application Project stage: Other ML0819703922008-07-14014 July 2008 Edwin I. Hatch, Transmittal of Responses to Request for Additional Information Addition of License Conditions to Operating Licenses for Request to Implement an Alternative Source Term Project stage: Request NL-08-1269, Request to Implement an Alternative Source Term Response to Requests for Additional Information Regarding Turbine Building Ventilation Exhaust Systems and Operating License Changes2008-08-14014 August 2008 Request to Implement an Alternative Source Term Response to Requests for Additional Information Regarding Turbine Building Ventilation Exhaust Systems and Operating License Changes Project stage: Response to RAI ML0817700752008-08-28028 August 2008 Issuance of Amendment Nos. 256 and 200, Alternate Source Term Project stage: Approval 2008-02-13
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Farley Nuclear Plant - Units 1 & 2, Vogtle Electric Generating Plant - Units 1 & 2, Annual Radiological Environmental Operating Reports for 2022 ML23123A2222023-05-0101 May 2023 Notification of Licensed Operator Initial Examination 05000321/2023301, and 05000366/2023301 IR 05000321/20230012023-04-26026 April 2023 Integrated Inspection Report 05000321/2023001 and 05000366/2023001 NL-23-0310, Annual Non-Radiological Environmental Operating Reports and Annual Radioactive Effluent Release Reports for 20222023-04-25025 April 2023 Annual Non-Radiological Environmental Operating Reports and Annual Radioactive Effluent Release Reports for 2022 NL-23-0019, GEN-ISI-ALT-2023-01, Request to Use Provision of a Later Edition of the ASME Boiler and Pressure Vessel Code, Section XI2023-04-12012 April 2023 GEN-ISI-ALT-2023-01, Request to Use Provision of a Later Edition of the ASME Boiler and Pressure Vessel Code, Section XI NL-23-0263, Southern Nuclear Company Submittal of Drug and Alcohol Testing Errors Identified 10 CFR 26.719(c) 30-Day Report2023-04-0505 April 2023 Southern Nuclear Company Submittal of Drug and Alcohol Testing Errors Identified 10 CFR 26.719(c) 30-Day Report NL-23-0014, Southern Nuclear Operating Co Submittal of Report on Status of Decommissioning Funding2023-03-29029 March 2023 Southern Nuclear Operating Co Submittal of Report on Status of Decommissioning Funding NL-23-0208, Independent Spent Fuel Storage Installation ISFSI, Decommissioning Funding Plan Triennial Update2023-03-29029 March 2023 Independent Spent Fuel Storage Installation ISFSI, Decommissioning Funding Plan Triennial Update NL-23-0228, Nuclear Property Insurance Coverage as of April 1, 2023 and Licensee Guarantees of Payment of Deferred Premiums (10 CFR 140.21)2023-03-20020 March 2023 Nuclear Property Insurance Coverage as of April 1, 2023 and Licensee Guarantees of Payment of Deferred Premiums (10 CFR 140.21) NL-23-0179, National Pollutant Discharge Elimination System (NPDES) Permit Renewal2023-03-13013 March 2023 National Pollutant Discharge Elimination System (NPDES) Permit Renewal ML23065A1092023-03-0808 March 2023 Correction of Relief Request HNP-ISI-RR-05-02 Allowing to Continue Operation with a Flaw Indication on One Reactor Pressure Vessel Closure Bolt Until December 31, 2025 ML23053A2182023-03-0303 March 2023 Correction of Amendment Nos. 321 and 266 Regarding License Amendment Request to Revise the (National Fire Protection Association) NFPA-805 Fire Protection Program IR 05000321/20220062023-03-0101 March 2023 Annual Assessment Letter Edwin I. Hatch Nuclear Plant, Units 1 and 2 - NRC Inspection Report 05000321/2022006 and 05000366/2022006 NL-23-0101, Cycle 28 Core Operating Limits Report Version 12023-02-23023 February 2023 Cycle 28 Core Operating Limits Report Version 1 ML23034A2462023-02-21021 February 2023 Audit Summary for License Amendment Request to Relax Required Number of Fully Tensioned Reactor Pressure Vessel Head Closure Studs ML22363A3932023-02-15015 February 2023 Issuance of Amendments Nos. 321 and 266, Regarding License Amendment Request to Revise the (National Fire Protection Association) NFPA-805 Fire Protection Program ML22346A1482023-02-0909 February 2023 Issuance of Amendments 320 and 265, Regarding LAR to Revise Technical Specifications to Adopt TSTF-208 and Administrative Correction for Duplicate Technical Specifications 3.4.10 2024-01-31
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML23341A2042024-01-12012 January 2024 Request for Additional Information Exemption Requests for Physical Barriers (EPID L-2023-LLE-0018 & L-2023-LLE-0021) ML23354A2032023-12-18018 December 2023 Document Request for Hatch Nuclear Plant - Radiation Protection Inspection - Inspection Report 2024-01 ML23250A0472023-09-20020 September 2023 Request for Additional Information Regarding License Amendment Request to Relax Required Number of Fully Tensioned Reactor Pressure Vessel Head Closure Bolts in Technical Specifications Table 1.1-1, Modes ML23264A0142023-09-14014 September 2023 NRR E-mail Capture - (External_Sender) Draft Round-2 RAI - Hatch, Units 1 and 2, Revise TS 1.1-1 Modes LAR ML23198A1552023-07-17017 July 2023 NRR E-mail Capture - for Your Action - Request for Additional Information (RAI) - Hatch, Farley, and Vogtle, Units 1 and 2 Quality Assurance Topical Report (QATR) Submittal Dated June 15, 2023 ML23018A1872023-01-17017 January 2023 2023 HNP CGD Inspection Information Request ML22355A2082022-12-21021 December 2022 NRR E-mail Capture - RAI - Hatch, Units 1 and 2, Reactor Pressure Vessel 'Rpv Head Studs' LAR ML23026A2372022-11-16016 November 2022 2023001 Hatch RP RFI Final ML22208A1332022-07-26026 July 2022 NRR E-mail Capture - RAI - Hatch, Units 1 and 2, TSTF-208 LAR ML22157A3542022-06-0606 June 2022 NRR E-mail Capture - RAI - Hatch, Units 1 and 2, TSTF-505 LAR ML22140A1192022-05-20020 May 2022 NRR E-mail Capture - RAIs - Hatch, Units 1 and 2, TSTF-505 LAR ML22073A0842022-03-21021 March 2022 an NRC Fire Protection Team Inspection (NRC Inspection Report Nos. 05000321/2022011 and 05000366/2022011) and Request for Information ML22025A2142022-01-21021 January 2022 Plant Hatch 2022001 RP Baseline Inspection Information Request ML21265A3402021-09-22022 September 2021 NRR E-mail Capture - Request for Additional Information - Hatch, Unit 1, Emergency TS 3.7.2 LAR ML21111A3032021-04-21021 April 2021 NRR E-mail Capture - RAI - Hatch Unit 2 - One-Time Emergency RHR LAR (L-2020-LRO-0068) ML21110A6842021-04-20020 April 2021 NRR E-mail Capture - RAI - Hatch Unit 2 - One-Time Emergency RHR LAR (L-2020-LRO-0068) ML21013A4112021-01-13013 January 2021 Notification of Edwin I. Hatch Nuclear Plant Design Bases Assurance Inspection U.S. Nuclear Regulatory Commission Inspection Report 05000321/2021010 and 05000366/2021010 ML20293A0752020-10-14014 October 2020 NRR E-mail Capture - RAIs for SNC Fleet EP LAR (L-2020-LLA-0150 and L-2020-LLA-0151) ML20253A2732020-09-0909 September 2020 Requalification Program Inspection Hatch Nuclear Station ML20149K6252020-05-27027 May 2020 NRR E-mail Capture - RAIs for SNC Fleet Fire Protection Exemption Requests NL-19-1532, Units 1 and 2 - Response to Requests for Additional Information Regarding Application to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures. Systems and Components for Nuclear Power Reactors2019-12-18018 December 2019 Units 1 and 2 - Response to Requests for Additional Information Regarding Application to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures. Systems and Components for Nuclear Power Reactors ML19336A0142019-12-0101 December 2019 NRR E-mail Capture - RAI: Hatch Emergency TS 3.7.1 Residual Heat Removal Service Water (RHRSW) System LAR ML19280A0082019-10-0404 October 2019 NRR E-mail Capture - Request for Additional Information (RAI) - Hatch TSTF-51 LAR (L-2019-LLA-0091) ML19224C0552019-08-12012 August 2019 NRR E-mail Capture - RAI - Edwin I. Hatch Nuclear Plant, LAR Regarding Degraded Voltage (L-2019-LLA-0108) ML19220A0362019-08-0808 August 2019 NRR E-mail Capture - RAI - Edwin I. Hatch Nuclear Plant, LAR Regarding Adoption of NFPA 805, Request for Additional Information, EPID L-2018-LLA-0107 ML19164A2582019-06-13013 June 2019 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection ML19107A4962019-04-17017 April 2019 NRR E-mail Capture - Request for Additional Information - Hatch 1 & 2 Application to Adopt Title 10 of Code of Federal Regulations 50.69 RISK-INFORMED Categorization and Treatment of Structures, Systems and Components for Power Reactors ML19088A0092019-03-29029 March 2019 NRR E-mail Capture - Hatch 1 and 2 - LAR to Adopt NFPA 805 Fire Protection Standard, EPID L-2018-LLA-0107, Request for Additional Information ML19029B3402019-01-23023 January 2019 Southern Nuclear Operating Company, Edwin I. Hatch Nuclear Plant, Unit Nos. 1 and 2 Draft Request for Additional Information for the License Amendment Requests to Adopt the Risk-Informed Provisions of Title 10 of the Code of Federal Regulat ML19016A3422019-01-10010 January 2019 U2 ISI 2019001 RFI - Bcc ML18355A4772019-01-0404 January 2019 Request for Additional Information Revise TS 5.2.2.g and Update Emergency Plan Minimum On-Shift Staff Tables ML18337A4032018-12-0606 December 2018 Request for Additional Information Revise Technical Specification 5.2.2.G and Updating Emergency Plan Minimum On-Shift Staff Tables ML18085A0132018-03-0808 March 2018 Draft Request for Additional Information on Alternative RR-V-11, Proposed Extension to Main Steam Safety Relief Valve Testing Requirements ML18058A0812018-02-27027 February 2018 Enclosurequest for Additional Information(Rai for Review of Southern Nuclear Operating Company'S Decommissioning Funding Plan Updates for Joseph M. Farley,Unit 1 and 2;Edwin I. Hatch,Units 1 and 2; and Vogtle Electric Generating Plant, Unit ML17306A0872017-11-0808 November 2017 Request for Additional Information Regarding the Decommissioning Funding Status Reports (EPID L-LRO-2017-0008) ML17284A3542017-11-0707 November 2017 Request for Additional Information Regarding Generic Letter 2016-01, Monitoring of Neutron Absorbing Materials in Spent Fuel Pools ML17270A1402017-09-27027 September 2017 PIR Notification Letter 2017 ML17290A3172017-09-19019 September 2017 NRR E-mail Capture - Hatch 1 and 2 - Draft Request for Additional Information Request for Alternative No. HNP-ISI-ALT-05-05 ML17111A5792017-04-26026 April 2017 Request for Additional Information, Fourth 10-Year ISI Interval Relief Requests ML17110A2112017-04-24024 April 2017 Request for Additional Information ML16330A1282016-12-0505 December 2016 Request for Additional Information ML16307A1842016-11-0202 November 2016 Request for Additional Information (Non-Proprietary) ML16271A1692016-10-17017 October 2016 Request for Additional Information ML16222A2952016-08-29029 August 2016 Request for Additional Information ML16205A0012016-07-22022 July 2016 Requalification Program Inspection - Plant Hatch ML16195A4002016-07-13013 July 2016 Request for Additional Information License Amendment Request to Revise Technical Specifications Regarding TSTF-500 ML16194A4282016-07-12012 July 2016 E-mail Draft Request for Additional Information for Technical Clarification ML16187A1222016-07-0101 July 2016 Notification of Inspection and Request for Information ML16111B3132016-04-20020 April 2016 Notification of Inspection and Request for Information ML16098A1442016-04-15015 April 2016 Request for Additional Information 2024-01-12
[Table view] |
Text
May 30, 2007 Mr. Dennis R. Madison Vice President - Hatch Edwin I. Hatch Nuclear Plant 11028 Hatch Parkway North Baxley, GA 31513
SUBJECT:
EDWIN I. HATCH NUCLEAR PLANT, UNIT NOS. 1 AND 2 (HNP) - REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING ALTERNATE SOURCE TERM APPLICATION (TAC NOS. MD2934 AND MD2935)
Dear Mr. Madison:
By letter to the U.S. Nuclear Regulatory Commission dated August 29, 2006, Southern Nuclear Operating Company, Inc., proposed to revise the HNP, licensing and design basis with a full scope implementation of an alternative source term. We have reviewed your application and have identified a need for additional information on the meteorology of the site as set forth in the Enclosure.
We discussed this issue with your staff on May 29, 2007. Your staff indicated that it plans to submit a response to this issue within sixty (60) days of receipt of this letter.
Sincerely,
/RA/
Robert E. Martin, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366
Enclosure:
RAI cc w/encl: See next page
- ML071280126 *transmitted by email dated OFFICE NRR/LPL2-1/PM NRR/LPL2-1/LA NRR/SCVB/BC NRR/LPL2-1/BC NAME RMartin:nc MOBrien MHart by email EMarinos DATE 05/30/07 05/14/07 05/7/07* 05/30/07 REQUEST FOR ADDITIONAL INFORMATION CONCERNING IMPLEMENTATION OF AN ALTERNATIVE SOURCE TERM FOR EDWIN I. HATCH NUCLEAR PLANT, UNIT NOS. 1 AND 2 (HNP)
- 1. The Nuclear Regulatory Commission (NRC) staff estimated the following distribution of atmospheric stability in the 1996 through 1998 hourly meteorological data files provided as Enclosure 3 to the November 6, 2006, submittal letter:
Stability A B C D E F G Category Frequency Occurrence 19.9% 3.7% 3.5% 16.5% 29.1% 13.2% 14.1%
The frequency of category D appears to be considerably lower, and categories A, F and G higher, than generally observed for other sites with a 50-meter (m) temperature difference ( -T) interval. This distribution appears to be more similar to measurements made from a smaller -T interval or possibly a temperature sensor less than 10-m above the ground. Please confirm that the category distributions are estimated from -T measurements between the 60-m and 10-m levels and, if so, describe how the data were converted to represent measurements of C/100 meters. If these data are -T measurements made between the 60-m and 10-m levels, what factors contribute to the relatively low occurrence of category D and moderately frequent occurrences of the A, F and G stability category meteorological conditions at the HNP site?
- 2. Wind speeds measured at the 10-m level from 1996 through 1998 appear to be lighter than generally reported for other sites, than would be estimated by exponential extrapolation of the 60-m measurements to the 10-m level, and in comparison to the early 1970's data presented in Table 2.3-14 of the HNP Final Safety Analysis Report.
NRC staff estimated the 5-percentile 1996 through 1998 10-m measured wind speed to be about 0.4 meters/second (m/s) while extrapolation of the 1996 through 1998 60-m winds result in a 5-percentile 10-m wind speed estimate slightly less than 1 m/s.
Further, the extrapolated 1970's data suggests a 10-m 5-percentile wind speed of approximately 0.7 m/s. Both the 1 m/s and 0.7 m/s estimates are more similar to the 5-percentile 10-m wind speeds reported at other sites. Do you agree that the 5-percentile 1996 through 1998 10-m wind speed measured at HNP was about 0.4 m/s?
If so, what factors contributed to these light winds?
- 3. Figures 4 and 5 of Enclosure 1 to the November 6, 2006, submittal provide wind roses of the 1996 through 1998 meteorological measurements. Calm winds are listed as having a frequency of occurrence of 0.95% at the 10-m level and 2.05% at the 60-m level. Are calms in this figure defined as winds less than one knot (nautical mile per hour) as suggested by the figure legends? If so, please confirm these estimates.
Based upon the 1996 through 1998 hourly data, NRC staff estimated a frequency of approximately 10% for winds less than one knot at the10-m level and 1% for winds at the 60-m level.
- 4. Do the control room atmospheric dispersion factors (/Q values) listed in the response to NRC Question 1 of Enclosure 1 of the November 6, 2006, submittal include consideration of /Q values applicable to the main steamline break accident (MSLB) and Enclosure
scenarios involving a loss of offsite power and other single failure? Which /Q values were used to model unfiltered inleakage into the control room and what is the basis for their use?
- 5. Please justify use of the 10-m and 60-m meteorological data to calculate the control room /Q values for postulated releases from the 101.7-m stack rather than meteorological data measured at the 10-m and 100-m levels. Regulatory Guide (RG) 1.194, "Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants," and NRC Regulatory Issue Summary 2006-04, "Experience with Implementation of Alternative Source Terms," recommend that if wind measurements are available at more than two elevations, the data at the height closest to the release height should be used when running the ARCON96 computer code.
- 6. NRC staff notes that there are no 0-0.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> fumigation /Q values explicitly given for postulated releases from the Hatch stack to the exclusion area boundary (EAB) and low population zone (LPZ). RG 1.183, "Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors," states that fumigation should be considered where applicable for the EAB and LPZ. For the EAB, the assumed fumigation period should be timed to be included in the worst 2-hour exposure period. Do the elevated release 0-2 hour EAB and LPZ /Q values include fumigation?
If not, why is fumigation considered inapplicable?
Edwin I. Hatch Nuclear Plant, Units 1 & 2 cc:
Laurence Bergen P.O. Box 1295 Oglethorpe Power Corporation Birmingham, AL 35201-1295 2100 E. Exchange Place P.O. Box 1349 General Manager Tucker, GA 30085-1349 Edwin I. Hatch Nuclear Plant Southern Nuclear Operating Company, Inc.
Mr. R. D. Baker U.S. Highway 1 North Manager - Licensing P.O. Box 2010 Southern Nuclear Operating Company, Inc. Baxley, GA 31515 P.O. Box 1295 Birmingham, AL 35201-1295 Mr. K. Rosanski Resident Manager Resident Inspector Oglethorpe Power Corporation Plant Hatch Edwin I. Hatch Nuclear Plant 11030 Hatch Parkway N. P.O. Box 2010 Baxley, GA 31531 Baxley, GA 31515 Harold Reheis, Director Department of Natural Resources 205 Butler Street, SE., Suite 1252 Atlanta, GA 30334 Steven M. Jackson Senior Engineer - Power Supply Municipal Electric Authority of Georgia 1470 Riveredge Parkway, NW Atlanta, GA 30328-4684 Mr. Reece McAlister Executive Secretary Georgia Public Service Commission 244 Washington St., SW Atlanta, GA 30334 Arthur H. Domby, Esq.
Troutman Sanders Nations Bank Plaza 600 Peachtree St, NE, Suite 5200 Atlanta, GA 30308-2216 Chairman Appling County Commissioners County Courthouse Baxley, GA 31513 Mr. Jeffrey T. Gasser Executive Vice President Southern Nuclear Operating Company, Inc.