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Category:Annual Operating Report
MONTHYEARML23121A2402023-05-0202 May 2023 Annual Radioactive Effluent Release Report RS-22-115, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors2022-10-19019 October 2022 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors RS-21-110, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors2021-10-19019 October 2021 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors SVPLTR 21-0027, Radioactive Effluent Release Report and Offsite Dose Calculation Manual2021-04-22022 April 2021 Radioactive Effluent Release Report and Offsite Dose Calculation Manual RS-20-128, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Dresden Nuclear Power Station, Units 2 and 32020-10-19019 October 2020 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Dresden Nuclear Power Station, Units 2 and 3 RS-19-103, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors2019-10-18018 October 2019 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors RS-18-132, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Dresden Nuclear Power Station, Units 2 and 32018-10-19019 October 2018 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Dresden Nuclear Power Station, Units 2 and 3 SVPLTR 18-0012, Submittal of 2017 Radioactive Effluent Release Report and Offsite Dose Calculation Manual2018-04-24024 April 2018 Submittal of 2017 Radioactive Effluent Release Report and Offsite Dose Calculation Manual RS-17-136, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors2017-10-20020 October 2017 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors RS-16-206, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors2016-10-21021 October 2016 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors RS-15-104, Annual Property Insurance Status Report2015-04-0101 April 2015 Annual Property Insurance Status Report SVPLTR 13-0016, Annual Radiological Environmental Operating Report2013-05-13013 May 2013 Annual Radiological Environmental Operating Report ML13141A6272013-04-30030 April 2013 2012 Radioactive Effluent Release Report and Offsite Dose Calculation Manual SVPLTR 12-0025, 2011 Annual Radiological Environmental Operating Report2012-05-11011 May 2012 2011 Annual Radiological Environmental Operating Report SVPLTR 11-0022, Submittal of 2010 Annual Radiological Environmental Operating Report2011-05-13013 May 2011 Submittal of 2010 Annual Radiological Environmental Operating Report ML11123A0332011-04-29029 April 2011 2010 Annual Radioactive Effluent Release Report RS-10-191, Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report2010-10-29029 October 2010 Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report SVPLTR 10-0027, Annual Radiological Environmental Operating Report2010-05-14014 May 2010 Annual Radiological Environmental Operating Report SVPLTR 09-0020, Submittal of 2008 Annual Radiological Environmental Operating Report2009-05-0808 May 2009 Submittal of 2008 Annual Radiological Environmental Operating Report SVPLTR 06-0054, Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report2006-11-0909 November 2006 Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report ML0414504142004-05-17017 May 2004 Annual Radiological Environmental Operating Report for 2003 ML0314200592003-05-14014 May 2003 Annual Radiological Environmental Operating Report for 2002 ML0037096542000-04-28028 April 2000 Annual Radiological Environmental Operating Report for 1999 2023-05-02
[Table view] Category:Letter type:SVPLTR
MONTHYEARSVPLTR 23-0037, Core Operating Limits Report for Cycle 292023-11-29029 November 2023 Core Operating Limits Report for Cycle 29 SVPLTR 23-0021, Registration of Use of Casks to Store Spent Fuel2023-06-20020 June 2023 Registration of Use of Casks to Store Spent Fuel SVPLTR 23-0018, Submittal of 2022 Annual Radiological Environmental Operating Report2023-05-15015 May 2023 Submittal of 2022 Annual Radiological Environmental Operating Report SVPLTR 23-0019, ILT 22-1 (2023-301) Svpltr 23-0019 Post-Exam Submittal Letter (1)2023-05-0101 May 2023 ILT 22-1 (2023-301) Svpltr 23-0019 Post-Exam Submittal Letter (1) SVPLTR 23-0014, Annual Dose Report for 20222023-04-15015 April 2023 Annual Dose Report for 2022 SVPLTR 23-0004, Owner'S Activity Report Submittal Dresden Nuclear Power Station 6500 North Dresden Road Morris, Il 60450 Fifth 10-Year Interval 2022 Refueling Outage Activities2023-02-10010 February 2023 Owner'S Activity Report Submittal Dresden Nuclear Power Station 6500 North Dresden Road Morris, Il 60450 Fifth 10-Year Interval 2022 Refueling Outage Activities SVPLTR 22-0037, Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report2022-09-0707 September 2022 Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report SVPLTR 22-0024, Registration of Use of Casks to Store Spent Fuel2022-06-16016 June 2022 Registration of Use of Casks to Store Spent Fuel SVPLTR 22-0016, Unit 3, Deviation from BWR Vessel and Internals Project (BWRVIP) Guideline - Inspection of Unit 2 and Unit 3 Shroud Vertical Welds2022-06-0808 June 2022 Unit 3, Deviation from BWR Vessel and Internals Project (BWRVIP) Guideline - Inspection of Unit 2 and Unit 3 Shroud Vertical Welds SVPLTR 22-0017, Registration of Use of Casks to Store Spent Fuel2022-05-25025 May 2022 Registration of Use of Casks to Store Spent Fuel SVPLTR 21-0061, Core Operating Limits Report for Dresden Unit 2 Cycle 282021-11-19019 November 2021 Core Operating Limits Report for Dresden Unit 2 Cycle 28 SVPLTR 21-0057, Submittal of 10 CFR 72.48 Evaluation Summary Report2021-10-15015 October 2021 Submittal of 10 CFR 72.48 Evaluation Summary Report SVPLTR 21-0030, Registration of Use of Casks to Store Spent Fuel2021-06-0202 June 2021 Registration of Use of Casks to Store Spent Fuel SVPLTR 21-0028, 2020 Annual Radiological Environmental Operating Report2021-05-0606 May 2021 2020 Annual Radiological Environmental Operating Report SVPLTR 21-0027, Radioactive Effluent Release Report and Offsite Dose Calculation Manual2021-04-22022 April 2021 Radioactive Effluent Release Report and Offsite Dose Calculation Manual SVPLTR 21-0005, Submittal of Analytical Evaluation of Isolation Condenser Nozzle to Shell Weld Flaw Indications (ISI Weld 3/2/1302A-12/12-8)2021-01-29029 January 2021 Submittal of Analytical Evaluation of Isolation Condenser Nozzle to Shell Weld Flaw Indications (ISI Weld 3/2/1302A-12/12-8) SVPLTR 20-0053, Deviation from BWR Vessel and Internals Project (BWRVIP) Guideline - Inspection of Unit 3 Top Guide Rim Weld2020-10-15015 October 2020 Deviation from BWR Vessel and Internals Project (BWRVIP) Guideline - Inspection of Unit 3 Top Guide Rim Weld SVPLTR 20-0045, Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report2020-09-0101 September 2020 Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report SVPLTR 20-0037, Response to Apparent Violation in NRC Inspection Report 05000237/2020012 and 05000249/2020012; EA-20-0532020-07-0202 July 2020 Response to Apparent Violation in NRC Inspection Report 05000237/2020012 and 05000249/2020012; EA-20-053 SVPLTR 20-0027, Registration of Use of Casks to Store Spent Fuel2020-05-14014 May 2020 Registration of Use of Casks to Store Spent Fuel SVPLTR 20-0014, Submittal of 2019 Radioactive Effluent Release Report and Offsite Dose Calculation Manual2020-04-21021 April 2020 Submittal of 2019 Radioactive Effluent Release Report and Offsite Dose Calculation Manual SVPLTR 20-0010, Fifth 10-Year Interval 2019 Refueling Outage Activities2020-02-13013 February 2020 Fifth 10-Year Interval 2019 Refueling Outage Activities SVPLTR 19-0049, Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report2019-09-10010 September 2019 Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report SVPLTR 19-0031, Registration of Use of Casks to Store Spent Fuel2019-06-14014 June 2019 Registration of Use of Casks to Store Spent Fuel SVPLTR 19-0020, Submittal of 2018 Radioactive Effluent Release Report and Offsite Dose Calculation Manual2019-04-19019 April 2019 Submittal of 2018 Radioactive Effluent Release Report and Offsite Dose Calculation Manual SVPLTR 19-0005, Owner'S Activity Report Submittal Fifth 10-Year Interval 2018 Refueling Outage Activities2019-02-0808 February 2019 Owner'S Activity Report Submittal Fifth 10-Year Interval 2018 Refueling Outage Activities SVPLTR 18-0025, Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report2018-08-15015 August 2018 Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report SVPLTR 18-0020, Corrected 2017 Radioactive Effluent Release Report2018-06-28028 June 2018 Corrected 2017 Radioactive Effluent Release Report SVPLTR 18-0018, Registration of Use of Casks to Store Spent Fuel2018-06-14014 June 2018 Registration of Use of Casks to Store Spent Fuel SVPLTR 18-0012, Submittal of 2017 Radioactive Effluent Release Report and Offsite Dose Calculation Manual2018-04-24024 April 2018 Submittal of 2017 Radioactive Effluent Release Report and Offsite Dose Calculation Manual SVPLTR 18-0007, Security Plan, Training and Qualification Plan, and Safeguards Contingency Plan, Revisions 17 and 182018-03-0101 March 2018 Security Plan, Training and Qualification Plan, and Safeguards Contingency Plan, Revisions 17 and 18 SVPLTR 17-0033, Submittal of Corrected 2016 Radioactive Effluent Release Report for January Through December2017-08-29029 August 2017 Submittal of Corrected 2016 Radioactive Effluent Release Report for January Through December SVPLTR 17-0026, Registration of Use of Casks to Store Spent Fuel2017-06-0606 June 2017 Registration of Use of Casks to Store Spent Fuel SVPLTR 17-0017, Submittal of 2016 Radioactive Effluent Release Report2017-04-26026 April 2017 Submittal of 2016 Radioactive Effluent Release Report SVPLTR 16-0027, 2016 Dresden Nuclear Station Initial License Examination Proposed Exam Files - Licensee Letter Transmitting the Proposed Examination/Test to the NRC2016-12-0101 December 2016 2016 Dresden Nuclear Station Initial License Examination Proposed Exam Files - Licensee Letter Transmitting the Proposed Examination/Test to the NRC SVPLTR 16-0061, Core Operating Limits Report for Unit 3 Cycle 252016-11-21021 November 2016 Core Operating Limits Report for Unit 3 Cycle 25 SVPLTR 16-0018, Transmittal of 2015 Radioactive Effluent Release Report and Offsite Dose Calculation Manual2016-04-25025 April 2016 Transmittal of 2015 Radioactive Effluent Release Report and Offsite Dose Calculation Manual SVPLTR 16-0017, Submittal of Post Accident Monitoring Report Instrumentation2016-04-0808 April 2016 Submittal of Post Accident Monitoring Report Instrumentation SVPLTR 16-0001, Cyber-Security Ms 1 Thru 7 Inspection 2014 405; Notification of Completion of Corrective Actions2016-01-21021 January 2016 Cyber-Security Ms 1 Thru 7 Inspection 2014 405; Notification of Completion of Corrective Actions SVPLTR 15-0070, Core Operating Limits Report for Cycle 24A2015-12-15015 December 2015 Core Operating Limits Report for Cycle 24A SVPLTR 15-0065, Core Operating Limits Report for Cycle 252015-11-16016 November 2015 Core Operating Limits Report for Cycle 25 SVPLTR 15-0059, Core Operating Limits Report, Cycle 242015-10-25025 October 2015 Core Operating Limits Report, Cycle 24 SVPLTR 15-0056, 1, 2 and 3 - Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report2015-09-0404 September 2015 1, 2 and 3 - Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report SVPLTR 15-0055, Notification of Readiness for NRC 95001 Inspection2015-08-25025 August 2015 Notification of Readiness for NRC 95001 Inspection SVPLTR 15-0052, Response to Preliminary White Finding2015-08-14014 August 2015 Response to Preliminary White Finding SVPLTR 15-0046, ISFSI - Registration of Use of Casks to Store Spent Fuel2015-07-17017 July 2015 ISFSI - Registration of Use of Casks to Store Spent Fuel SVPLTR 15-0043, Registration of Use of Casks to Store Spent Fuel2015-06-12012 June 2015 Registration of Use of Casks to Store Spent Fuel SVPLTR 15-0034, 2014 Annual Radiological Environmental Operating Report2015-05-14014 May 2015 2014 Annual Radiological Environmental Operating Report SVPLTR 15-0020, Written Position on Preliminary White Finding Discussed in NRC Inspection Report 05000237/2014005; 05000249/20140052015-03-0202 March 2015 Written Position on Preliminary White Finding Discussed in NRC Inspection Report 05000237/2014005; 05000249/2014005 SVPLTR 15-0014, Owner'S Activity Report Submittal Fifth 10-Year Interval 2014 Refueling Outage Activities2015-02-11011 February 2015 Owner'S Activity Report Submittal Fifth 10-Year Interval 2014 Refueling Outage Activities 2023-06-20
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Exelon Genera tion Company, LLC ExekrnD Dresden Nuclear Power Station www.exelonICOTp.COMr Nuclear 65oo North Dresden Road Morris, IL 60450-9765 10 CFR 50.46(a)(3)(ii)
November 9, 2006 SVPLTR: #06-0054 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Dresden Nuclear Power Station, Units 2 and 3 Renewed Facility Operating License Nos. DPR-19 and DPR-25 NRC Docket Nos. 50-237 and 50-249
Subject:
Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report
Reference:
Letter from D. Bost (Exelon Generation Company, LLC) to U. S. NRC, "Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report," dated November 16, 2005 In accordance with 10 CFR 50.46, "Acceptance criteria for emergency core cooling systems for light-water nuclear power reactors," paragraph (a)(3)(ii), Exelon Generation Company LLC, is submitting this letter and its attachment to meet the annual reporting requirements.
Dresden Nuclear Power Station (DNPS) has maintained the same emergency core cooling (ECCS) model as reported in the referenced letter. One vendor 10 CFR 50.46 LOCA model change/error notification was received since the last annual report. The vendor has implemented a change in performing analysis of small break LOCA cases, which requires considering both mid-peaked as well as top-peaked power shapes. The effect of this change was evaluated for DNPS LOCA analyses and it was determined that the impact on the licensing basis Peak Cladding Temperature (POT) is zero. The attachment provides the POT value for each unit and the "rack-up" sheets for the LOCA analyses, along with assessment note summaries.
If there are any questions concerning this letter, please contact Mr. James Ellis at (815) 416-2800.
Respectf ully, DannyB Site Vi e~ President Dresden Nuclear Power Station Attachmen t: Dresden Nuclear Power Station Units 2 and 3 - 10 CER 50.46 Report cc: Regional Administrator - NRC Region III NRC Senior Resident Inspector - Dresden Nuclear Power Station 74 ow
Attachment Dresden Nuclear Power Station Units 2 and 3 1OC FR5O.46 Report PLANT NAME: Dresden Nuclear Power Station, Unit 2 ECCS EVALUATION MODEL: SAFE R/G ESTR-LOCA REPORT REVISION DATE: 10/20/2006 CURRENT OPERATING CYCLE: 20 ANALYSIS OF RECORD Evaluation Model: The GESTR-LOCA and SAFER Models for the Evaluation of the Loss-of-Coolant Accident, Volume 111,SAFER/GESTR Application Methodology, NEDE-23785-1 -PA, General Electric Company, Revision 1, October 1984.
Calculations:
"SAFER/GESTR-LOCA Loss-of-Coolant Accident Analysis for Dresden Nuclear Station 2 and 3 and Quad Cities Nuclear Station Units 1 and 2," NEDC-32990P, Revision 2, GE Nuclear Energy, September 2003.
Fuel: 9x9-2, ATRIUM-9B3 and GE14 Limiting Fuel Type: GE14 Limiting Single Failure: Diesel Generator Limiting Break Size and Location: 1.0 Double-Ended Guillotine in a Recirculation Suction Pipe Reference Peak Cladding Temperature (PCT) PCT = 21100'F MARGIN ALLOCATION A. PRIOR LOCA MODEL ASSESSMENTS 10 CFR 50.46 report dated December 6, 2001 (See Note 1) APCT = 00 F 10 CFR 50.46 report dated November 25, 2002 (See Note 2) APCT = 00 F 10 CFR 50.46 report dated November 25, 2003 (See Note 3) APCT = 00 F 10 CFR 50.46 report dated November 24, 2004 (See Note 4) APCT = 0OF 10 CFR 50.46 report dated November 16, 2005 (See Note 5) APCT = 00 F Net PCT 2110 OF B. CURRENT LOCA MODEL ASSESSMENTS GE Reload (Note 6) APCT = 00 F Additional Core Spray Line Leakage (Note 7) APCT = 00F Axial Power Shape Impact on Small Break LOCA (Note 8) APCT = 00F Total PCT change from current assessments Z-APCT =0 OF Cumulative PCT change from current assessments YZI APCT I 0-F Net PCT 2110 OF
Attachment Dresden Nuclear Power Station Units 2 and 3 10CFR5O.46 Report PLANT NAME: Dresden Nuclear Power Station, Unit 3 ECCS EVALUATION MODEL: SAFE R/G ESTR- LOCA REPORT REVISION DATE: 10/20/2006 CURRENT OPERATING CYCLE: 19 ANALYSIS OF RECORD Evaluation Model: The GESTR-LOCA and SAFER Models for the Evaluation of the Loss-of-Coolant Accident, Volume Ill, SAFER/GESTR Application Methodology, NEDE-23785-1-PA, General Electric Company, Revision 1, October 1984.
Calculations:
"SAFER/GESTR-LOCA Loss-of-Coolant Accident Analysis for Dresden Nuclear Station 2 and 3 and Quad Cities Nuclear Station Units 1 and 2," NEDC-32990P, Revision 2, GE Nuclear Energy, September 2003.
Fuel: 9x9-2, ATRIUM-9B3 and GE14 Limiting Fuel Type: GE14 Limiting Single Failure: Diesel Generator Limiting Break Size and Location: 1.0 Double-Ended Guillotine in a Recirculation Suction Pipe Reference Peak Cladding Temperature (PCT) PCT = 21100'F MARGIN ALLOCATION A. PRIOR LOCA MODEL ASSESSMENTS 10 CFR 50.46 report dated November 25, 2002 (See Note 2) APCT = 0F 10 CFR 50.46 report dated November 25, 2003 (See Note 3) APCT = 0F 10 CFR 50.46 report dated November 24, 2004 (See Note 4) APCT = 0F 10 CFR 50.46 report dated November 16, 2005 (See Note 5) APCT = 0F Net PCT 2110 OF B. CURRENT LOCA MODEL ASSESSMENTS Axial Power Shape Impact on Small Break LOCA (Note 8) APOT = 0 0 F Total PCT change from current assessments I ZAPCT = 00F Cumulative PCT change from current assessments Y_IAPCT I=OOF Net PCT 2110 OF
Attachment Dresden Nuclear Power Station Units 2 and 3 10CFR5O.46 Report Notes:
- 1. Prior LOCA Model Assessment The 50.46 letter dated December 6, 2001 reported a new LOCA analysis to support extended power uprate (EPU) and transition to GE14 fuel for Dresden Unit 2 Cycle
- 18. The same report assessed impact of errors in Framatome ANP LOCA analysis model for Dresden Unit 3 Cycle 17 at pre-EPU power level.
[
Reference:
Letter from Preston Swafford (PSLTR: #01 -0122) (Exelon) to USNRC, "Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report," December 6, 2001.]
- 2. Prior LOCA Model Assessment Unit 3 implemented GE LOCA analysis and GE14 fuel with Dresden Unit 3 Cycle 18 startup on October 25, 2002. Therefore, both Dresden Units 2 and 3 are being maintained under the same LOCA analysis. In the referenced letter, the impact of GE LOCA error in the WEVOL code was reported for Dresden Units 2 and 3 and determined to be negligible.
[
Reference:
Letter from Robert J. Hovey (RHLTR: #02-0083) (Exelon) to USNRC, "Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report," November 25, 2002.]
- 3. Prior LOCA Model Assessment The annual 50.46 report provided information on the LOCA model assessments for SAFER LevelNolume table error and Steam Separator pressure drop error. In the referenced letter, the impact of these two GE LOCA errors were reported to be negligible.
[
Reference:
Letter from Robert J. Hovey (RHLTR: #03-0077) (Exelon) to USNRC, "Plant Specific ECOS Evaluation Changes - 10 CFR 50.46, Report," November 25, 2003.]
- 4. Prior LOCA Model Assessment The referenced annual 50.46 report provided information on reload of GE14 fuel for Dresden Unit 2 Cycle 19 and impact of postulated hydrogen-oxygen recombination on PCT. GE determined that there is no PCT impact because of the change due to the new reload of GE14 fuel and the postulated hydrogen -oxygen recombination.
[
Reference:
Letter from Danny Bost (SVPLTR: #04-0075) (Exelon) to USNRC, "Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report," November 24, 2004.]
- 5. Previous LOCA Model Assessment The referenced letter provided the annual 50.46 report for Units 2 and 3. The letter reported the PCT impact of reload of GE1 4 fuel for D3C1 9 starting on December 8,
Attachment Dresden Nuclear Power Station Units 2 and 3 10CFR5O.46 Report 2004. Also, the letter reported the GE LOCA evaluation for Unit 3, which implemented the lower sectional replacement and T-box clamp repairs. GE determined that there is no POT impact because of the change due to the new reload of GE1 4 fuel and the lower sectional replacement and T-box clamp repairs.
[
Reference:
Letter from Danny Bost (SVPLTR: #05-0044) (Exelon) to USNRC, "Plant Specific ECCS Evaluation Changes - 10 CFR 50.46 Report," November 16, 2005.]
- 6. Current LOCA Model Assessment Dresden Unit 2 Cycle 20 started on November 20, 2005 with a reload of GE14 fuel.
The impact of this reload was evaluated by GE and reported to be negligible. With this reload, Unit 2 core consists of all GE14 fuel type. GE determined that there is no PCT impact because of the change due to the new reload of GE14 fuel.
[
Reference:
"Supplemental Reload Licensing Report for Dresden 2 Reload 19 Cycle 20," 0000-0035-6363-SRLR, Revision 1, October 2005.]
- 7. Current LOCA Model Assessment During D2R19 outage, an increased leakage of less than 5 gpm at runout condition in core spray line flow due to crack growth was evaluated by GE for impact on the LOCA analysis. The analytical limit for the Core Spray flow increased by 50 gpm that offsets the increase in the leakage. The Dresden Unit 2 LOCA analysis continues to meet the 10 CFR 50.46 acceptance criteria.
[
Reference:
"Effect on Increased Leakage and CS Flow on Dresden 2 LOCA, GE-NE-0000-0047-9777-RO, 11/17/05 (transmitted via letter GE-EB2JXFGG-002, dated 11/18/05).]
- 8. Current LOCA Model Assessment Past GE small break analysis assumed a mid-peaked power shape consistent with the GE methodology. Recently, GE has determined that for small break cases, a top-peaked power shape can result in higher calculated PCT than a mid-peaked shape. GE has implemented a change in performing analysis of small break LOCA cases, which requires considering both mid-peaked as well as top-peaked power shapes. GE has evaluated effect of this change for Dresden LOCA analysis and determined the impact on the licensing basis PCT is zero. This is because the limiting POT is based on the DBA large break and the revised small break POT remains below the limiting large break. Therefore, the impact on the limiting large break POT and as a result licensing basis POT is reported as zero.
[
Reference:
Exelon Dresden Station (Unit 2 & 3), "10 CFR5O.46 Notification Letter 2006-1, July 28, 2006.]