3150-AH42 201804 Unified Agenda of Federal Regulatory and Deregulatory Actions 3150 Nuclear Regulatory Commission NRC Performance-Based Emergency Core Cooling System Acceptance Criteria [NRC-2008-0332]

This rule would amend the Nuclear Regulatory Commission's regulations in 10 CFR 50.46 that specify the fuel cladding acceptance criteria for emergency core cooling system (ECCS) loss-of-coolant accidents (LOCA) evaluations. The new ECCS acceptance criteria would be performance-based, and reflect recent research findings that identified new embrittlement mechanisms for fuel rods with zirconium alloy cladding under LOCA conditions. The rule would address petitions from the public (PRM-50-71 and PRM-50-84) that request changes to these regulations. This rule was previously titled "50.46b Fuel Cladding." This rule contains a risk-informed alternative to address the effects of debris in the long-term.

]]> Substantive, Nonsignificant Previously Published in The Unified Agenda Final Rule Stage No No Independent agency 10 CFR 50 42 U.S.C. 2201 42 U.S.C. 5841 No ANPRM 08/13/2009 74 FR 40765 ANPRM Comment Period End 10/27/2009 NPRM 03/24/2014 79 FR 16106 NPRM Comment Period End 08/21/2014 Final Rule 05/00/2018 The draft final 10 CFR 50.46c rule was delivered to the Commission on March 16, 2016 (SECY-16-0033). No No None No No No Alysia Bone 3150 Nuclear Regulatory Commission NRC 301 415-1034 alysia.bone@nrc.gov Office of Nuclear Material Safety and Safeguards, Washington DC 20555-0001