NEIOwners Group ECCS Margin Assessment 10 CFR 50

NEI/Owners Group ECCS Margin Assessment 10 CFR 50. 46 c Proposed Rule SECY-12 -0034 Draft RG Analytical Limits Draft RGs Test Procedures Research Fuel Fragmentation & Dispersal Completed: 1 Q 2012 50. 46 c Safety Assessment Completed: 3 Q 2011 SRM-SECY-12 -0034 • Compile research data on fuel fragmentation and dispersal. • Assess safety significance. . • Document technical basis. • Add alternative for risk-informed approach to debris (GSI-191). • Complete research on fuel fragmentation and dispersal and identify impacts. 1 Q 2013 Issued: 1 Q 2013 Round Robin 10 CFR 50. 46 c Proposed Rule 2 Q 2013 STP Pilot Risk. Informed GSI-191 3 Q 2013 Submitted: 3 Q 2013 4 Q 2013 Review STP Pilot Issued: 1 Q 2014 Completed 1 Q 2014 Public Comment Period 2 Q 2014 • 120 day comment period. Public Comment Period Regulatory Basis • 120 day comment period. Ends: 2 Q 2014 Prepare Final Rule Prepare RG 3 Q 2014 • Develop regulatory basis for addressing fuel fragmentation and dispersal. • Identify scope of new regulatory requirements and impacts to 50. 46 c. 4 Q 2014 Issued: 4 Q 2014 Draft RG Risk. Informed Alternative 1 Q 2015 Completed: 1 Q 2015 2 Q 2015 Completed: 2 Q 2015 3 Q 2015 Public Comment Period Completed: 2 Q 2015 • 120 day comment period. Revise SRP NUREG-0800 Ends: 2 Q 2015 Completed: 4 Q 2015 Prepare RG Revise RG 1. 157 Completed: 1 Q 2016 Completed: 1 Q 2016 RG Issued: 1 Q 2016 Completed: 1 Q 2016 RG Risk-Informed Alternative 2 Q 2016 10 CFR 50. 46 c Final Rule Issued Completed: 2 Q 2016 Issued: 4 Q 2016 3 Q 2016 Cladding Hydrogen Uptake Models 4 Q 2016 Employ Reg Guide PQD Analytical Limits 1 Q 2017 • Collect hot-cell hydrogen measurements. • Perform PQD testing. 2 Q 2017 Track #1 • Develop analytical limits. • 66 plants which require no new models nor new LOCA calculations. 3 Q 2017 • Document compliance, revise UFSAR, and submit letter report to NRC. Completion: 4 Q 2017 • Vendors update LOCA models and methods. • Approx. 12 models • Develop alloy-specific hydrogen uptake models. Elect to Perform PQD Testing PQD Tests LOCA Model Updates Breakaway Tests • Approx. 8 models • Perform breakaway oxidation testing. • Develop analytical limits. Completion: 4 Q 2017 Completed 4 Q 2017 • Approx. 50 AORs. 4 Q 2017 NRC Review • Review analytical limits. NRC Review • Review vendors alloy-specific hydrogen models. NRC Review • Review LOCA models and methods. 1 Q 2018 2 Q 2018 3 Q 2018 Track #2 Completion: 4 Q 2018 Completed: 4 Q 2018 • 14 PWR plants currently using realistic models and require new analysis. • 2 BWR/2 plants. • Prepare LAR. • Approx. 13 AORs. 1 Q 2019 Periodic Breakaway Tests 2 Q 2019 3 Q 2019 Periodic Breakaway Tests 4 Q 2019 Track #3 • 16 PWR plants currently using Appendix K and require new analysis. 1 Q 2020 • 6 BWR/3 plants. • Approx. 14 AORs. 2 Q 2020 Periodic Breakaway Tests 3 Q 2020 4 Q 2020 1 Q 2021 Completion: 4 Q 2020 NRC Review • Review Track #2 LARs. Periodic Breakaway Tests 2 Q 2021 Completion: 4 Q 2021 3 Q 2021 NRC Review 4 Q 2021 Completed: 4 Q 2022 • Review Track #3 LARs. Completed: 4 Q 2024 Periodic Breakaway Tests Completed: 4 Q 2018