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NRC RIN: 3150-AH42 Publication ID: Spring 2018 
Title: Performance-Based Emergency Core Cooling System Acceptance Criteria [NRC-2008-0332]  
Abstract:

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. 

 
Agency: Nuclear Regulatory Commission(NRC)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
EO 14192 Designation: Independent agency 
CFR Citation: 10 CFR 50   
Legal Authority: 42 U.S.C. 2201    42 U.S.C. 5841   
Legal Deadline:  None
Timetable:
Action Date FR Cite
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 
Additional Information: The draft final 10 CFR 50.46c rule was delivered to the Commission on March 16, 2016 (SECY-16-0033).
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Alysia Bone
Nuclear Regulatory Commission
Office of Nuclear Material Safety and Safeguards,
Washington, DC 20555-0001
Phone:301 415-1034
Email: alysia.bone@nrc.gov