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NRC RIN: 3150-AI01 Publication ID: Fall 2008 
Title: Amend Fracture Toughness Requirements Against Pressurized Thermal Shock Event 
Abstract: The proposed rule would amend the Commission's regulations that protect against brittle fracture of reactor vessels during severe cooldown events. The existing regulations establish screening limits that were developed based on what NRC believed to be a conservative probabilistic fracture mechanics analysis. Several licensees will exceed the screening limits in the current rule during their license renewal periods. The proposed rule would provide alternate fracture toughness requirements which reflect an updated technical basis. 
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 USC 2201    42 USC 5841   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  10/03/2007  72 FR 56275   
NPRM Comment Period End  11/02/2007    
NPRM Comment Period Reopened  11/21/2007  72 FR 65470   
NPRM Comment Period End  12/17/2007    
Supplemental NPRM  08/11/2008  73 FR 46557   
Supplemental NPRM Comment Period End  09/10/2008    
Final Rule  07/00/2009    
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Veronica M. Rodriguez
Nuclear Regulatory Commission
Office of Nuclear Reactor Regulation,
Washington, DC 20555-0001
Phone:301 415-3703
Email: veronica.rodriguez@nrc.gov