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MONTHYEARML20315A1172020-12-25025 December 2020 DAEC-LIC504-Immediate-Determination-11-02 Project stage: Request ML21022A4182021-01-22022 January 2021 Non-Concurrence 2020-007, - MD 8.3 Evaluation - Duane Arnold Energy Center - Loss of Offsite Power Event Project stage: Request ML21022A4152021-01-22022 January 2021 8/10/2020 MD 8.3 Evaluation - Duane Arnold Energy Center - Loss of Offsite Power Event Project stage: Request ML21042A0792021-02-17017 February 2021 DAEC Executive Summary of Risk Assessment of Derecho Impact on Duane Arnold Project stage: Request ML21078A1272021-03-30030 March 2021 Final-LIC-504 Closure Memo - 03/30/2021 Project stage: Request ML21146A1832021-05-27027 May 2021 Updated 2 Nextera - Duane Arnold Energy Center Loss of Offsite Power Due to Derecho Event Aug 2020 Project stage: Other ML21145A1662021-05-27027 May 2021 DAEC Webinar May 27, 2021 Project stage: Other ML21145A0302021-05-27027 May 2021 NextEra Energy - Duane Arnold Energy Center - Loss of Offsite Power Due to Derecho (August 2020) Project stage: Other 2021-02-17
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Category:Slides and Viewgraphs
MONTHYEARML24073A3372024-03-13013 March 2024 NextEra - NRC Slides for the Public Meeting on March 19, 2024 Regarding Emergency Plan Licensing Amendment ML22061A1052022-02-18018 February 2022 4A-3_of_4-Hunter-Duane_Arnold_ASP_Analysis-SLIDES ML22061A1062022-02-18018 February 2022 4A-2_of_4-Hanna-Duane_Arnold-rev0-SLIDES ML22061A1042022-02-15015 February 2022 4A-4_of_4-Leech-DAEC_LIC504_for_PFHA_Workshop-SLIDES ML22061A1072022-02-15015 February 2022 4A-1_of_4-Brandt-DAEC_Derecho_Sequence_of_Events-SLIDES NRC-2020-0148, Comment (1) of Bari Richter on NextEra Energy Duane Arnold, LLC; Duane Arnold Energy Center; Post-Shutdown Decommissioning Activities Report; Reopening of Comment Period2021-12-20020 December 2021 Comment (1) of Bari Richter on NextEra Energy Duane Arnold, LLC; Duane Arnold Energy Center; Post-Shutdown Decommissioning Activities Report; Reopening of Comment Period ML21278A0602021-10-0606 October 2021 Slides for Duane Arnold Virtual PSDAR Meeting - October 6, 2021 ML21146A1832021-05-27027 May 2021 Updated 2 Nextera - Duane Arnold Energy Center Loss of Offsite Power Due to Derecho Event Aug 2020 ML21146A0562021-05-27027 May 2021 Updated Nextera - Duane Arnold Derecho Event Aug 2020 ML21145A1662021-05-27027 May 2021 DAEC Webinar May 27, 2021 ML21145A0302021-05-27027 May 2021 NextEra Energy - Duane Arnold Energy Center - Loss of Offsite Power Due to Derecho (August 2020) ML20253A1912020-09-24024 September 2020 Slides for Decommissioning Webinar Regarding Duane Arnold Energy Center on September 24, 2020 ML20261H3892020-09-17017 September 2020 Slides for Decommissioning-Overview Webinar Regarding Duane Arnold Energy Center Presented on September 24, 2020 ML20240A2702020-08-27027 August 2020 2019 EOC Slide Presentation ML20223A0562020-08-12012 August 2020 Slides for Decommissioning Webinar Regarding Duane Arnold Energy Center on August 12, 2020 ML19127A2562019-05-0707 May 2019 NRC 2018 Assessment Summary Hand Out for Duane Arnold Energy Center ML17139D4432017-05-19019 May 2017 Us NRC Probabilistic Risk Assessment Confirmatory Success Criteria Analysis Using the Duane Arnold Site ML17115A1972017-04-24024 April 2017 5/1/17, Meeting Slide for Pre-application Teleconference with NextEra Energy Duane Arnold, LLC Regarding a License Amendment Request for Duane Arnold Energy Center to Adopt TSTF-542 ML16288A2462016-10-13013 October 2016 Pre-Submittal Call: License Amendment Request for Change in DAEC Emergency Plan, Emergency Planning Zone Boundary - July 13, 2016 ML16190A1442016-07-13013 July 2016 July 13, 2016, Pre-Submittal Call Concerning License Amendment Request for Change in Duane Arnold Energy Center Emergency Plan Emergency Planning Zone Boundary ML16167A0252016-06-30030 June 2016 License Amendment Request for Change in Emergency Plan Staff Augmentation Response Times ML16117A1982016-04-26026 April 2016 Slide Presentation on U.S. NRC-RES Confirmatory Success Criteria Analysis (for May 3, 2016 Public Meeting) ML15335A3222015-12-10010 December 2015 Pre-Submittal Meeting for Spent Fuel Pool Criticality Analyses ML15112B1302015-04-16016 April 2015 2015_NRC_End_Cycle_Meeting - Final for Presentation ML15112B1352015-04-16016 April 2015 2014 Duane Arnold EOC Public Meeting Slides ML14121A2872014-04-30030 April 2014 Summary of Public Meeting to Discuss the 2013 Annual Assessment Results, Slides ML14007A2292014-01-0707 January 2014 EA-13-223 Duane Arnold RCIC Reg Conference Presentation Final ML13308A9052013-11-0505 November 2013 Regulatory Conference Presentation ML13159A0092013-06-0404 June 2013 Notable Failures in Nondustructive Testing - June 4, 2013 Public Meeting ML13106A1542013-04-15015 April 2013 NRC - Duane Arnold Energy Center End-Of-Cycle Presentation ML12115A3222012-04-26026 April 2012 Annual Assessment Meeting Open House - NRC Slides ML1107703492011-03-22022 March 2011 3/22/11 PRE-Application Meeting Slides Regarding NFPA 805 License Amendment Request ML1108206992011-03-22022 March 2011 3/22/11 Revised Pre-application Meeting Slides Regarding NFPA 805 License Amendment Request ML0918705282009-07-0707 July 2009 License Renewal Process and Environmental Public Scoping Meeting Slides ML0810505152008-04-10010 April 2008 Summary Meeting Slides - DAEC Annual Assessment Meeting ML0725306142007-09-21021 September 2007 Public Meeting Summary on the Reactor Oversight Process ML0706601662007-03-0101 March 2007 Regulatory Conference with Fpl/Daec Slide Presentation, NRC Emergency Preparedness IR ML0706702592007-03-0101 March 2007 Public Meeting Slides, Re Regulatory Conference, Duane Arnold Exercise Critique Finding ML0615106012006-05-23023 May 2006 EPRI HRA Users Group Review of Draft NUREG-1842 ML0618900062006-04-14014 April 2006 Slides, Meeting Summary, 4/14/2006, Dose Consequences Analysis for Control Rod Drop Accident Without Automatic Trip of Mechanical Vacuum Pump ML0610403382006-04-11011 April 2006 Public Meeting NRC Presentation Slides with Florida Power and Light to Discuss Duane Arnold Energy Center End-of-Cycle Plant Performance Assessment ML0604000582005-12-31031 December 2005 Enclosure 1 - Slides - NRC Briefing HPCI ML0533202252005-12-0101 December 2005 Ri Schedule 05- Mcmurtray; Lessons Learned from Security-Based Table Top Drills ML0513303322005-05-0909 May 2005 Public Meeting Slides Duane Arnold End-of-Cycle Plant Performance Assessment ML0434900602004-11-30030 November 2004 NMC Slides for 11/30/04 Public Meeting ML0410504422004-04-0505 April 2004 Public Meeting Slides, Duane Arnold 2003 End-of-Cycle Assessment ML0309204322003-04-11011 April 2003 Summary of Meeting with Nuclear Management Co., LLC to Discuss Duane Arnold Energy Center End of Cycle Plant Performance Assessment. NRC Presentation Slides ML0208008962002-03-18018 March 2002 Annual Assessment Presentation - March 2002 2024-03-13
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Text
Duane Arnold Energy Center Loss of Offsite Power Due to Derecho May 27, 2021
Outline
DAEC Overview
- GE BWR/4 - Mark I Containment
- Rated Thermal Power 1,912 MW(t)
~615 MW(e) 3
Plant status prior to event
- Plant Status on August 10, 2020
- Reactor Power approximately 80% due to surveillance testing on LPCI
- Diesel Driven Fire Pump inoperable due to maintenance
- Dry cask storage campaign under way in the spent fuel pool
- Weather Forecast for August 10, 2020
- National Weather Service Storm Prediction Center issued Moderate Risk Outlook
- At 11:38 the National Weather Service Issued a Severe Thunderstorm Watch for the DAEC area which was upgraded to a Severe Thunderstorm Warning at 12:02 4
Detailed Event Summary
- August 10 - 12:30 to 12:35
- High sustained winds cause perturbation in the power lines feeding DAEC
- At 12:35 voltage drop is significant enough to automatically start the diesel generators, but they did not tie on to their respective buses as offsite power was still available
- Sustained high winds damage all power lines leading to the plant causing a loss of offsite power
- The plant responded as designed The reactor tripped and all control rods fully insert Emergency Diesel Generators (already operating) automatically connect to and power their respective essential buses Operators enter their emergency response procedures
- Notice of Unusual Event Reported to the NRC 5
Detailed Event Summary
- August 10 - 13:00 to 24:00
- Operations establishes a controlled cooldown to begin shutdown cooling
- Emergency Service Water strainer differential pressure alarm in Control Room Operations bypassed strainer in accordance with station procedures Emergency Service Water system stable operation throughout the event
- Systems restored to facilitate plant reliability Reactor Water Cleanup Spent Fuel Pool Cooling General Service Water
- Coordinate with ITC to prepare Switchyard for repairs 6
Detailed Event Summary
- Operations established cold shutdown conditions
- 161kV Vinton line is restored to the switchyard restoring off-site power
- Decision is made to perform a controlled evolution to restore power as the Emergency Diesel Generators are performing well
- Startup transformer is reenergized from offsite power
- August 11 - 13:12 to 13:24
- Safety Bus A and B reenergized from offsite power
- Notice of Unusual Event Terminated 7
Insights
- There was never an impact to public health or safety
- The plant operated as designed when offsite power was lost
- The loss of the cooling towers did not impact the ability to safely shut the plant down, decay heat removal maintained through the Cedar River
- Operators responded in accordance with plant procedures
- Assisted SRA and SRI with risk significance
- Engaged owners group to provide insights for generic impact
- Provided comments to NRC ASP report 8