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NRC RIN: 3150-AH42 Publication ID: Fall 2016 
Title: Performance-Based Emergency Core Cooling System Acceptance Criteria [NRC-2008-0332]  

This rule would amend the 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 proposed ECCS acceptance criteria are performance-based, and reflect recent research findings that identified new embrittlement mechanisms for fuel rods with zirconium alloy cladding under loss-of-coolant accident conditions.  Addresses PRM-50-71 and PRM-50-84.  Previously titled "50.46b Fuel Cladding."  This rule would also contain a risk-informed alternative to address the effects of debris during 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 
CFR Citation: 10 CFR 50   
Legal Authority: 42 U.S.C. 2201    42 U.S.C. 5841   
Legal Deadline:  None
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  01/00/2017 
Additional Information: The NRC staff provided the proposed rule package (SECY-12-0034, Proposed Rulemaking 10 CFR 50.46c: Emergency Core Cooling System Performance During Loss-of-Coolant Accidents (RIN 3150-AH42)) to the Commission on March 1, 2012. The package is publicly available at ADAMS Accession No. ML112620346. That package was supplemented by a memo to the Commission dated June 1, 2012 (ADAMS Accession No. ML12137A852). The staff requirements memorandum was issued on January 7, 2013, and is available at ADAMS Accession No. ML13007A478. The proposed rule and three draft regulatory guides were published for comment on March 24, 2014 and incorporated the Commission direction from SRM-SECY-12-0034. The 150-day comment period ended on August 21, 2014. An additional draft regulatory guide associated with the alternative risk-informed approach for addressing the effects of debris on long-term cooling was published for comment on April 20, 2015 (80 FR 21658), and this comment period closed on July 6, 2015. 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:
Jessica Kratchman
Nuclear Regulatory Commission
Office of Nuclear Reactor Regulation,
Washington, DC 20555-0001
Phone:301 415-5112