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NRC RIN: 3150-AI01 Publication ID: Spring 2010 
Title: Alternate Fracture Toughness Requirements for Protection Against Pressurized Thermal Shock Events [NRC-2007-0008] 
Abstract: The final rule amends the Commission's regulations to provide alternate fracture toughness requirements for protection against pressurized thermal shock (PTS) events for pressurized water reactor (PWR) pressure vessels. This final rule provides alternate PTS requirements based on updated analysis methods. This action is desirable because the existing requirements are based on unnecessarily conservative probabilistic fracture mechanics analyses. This action reduces regulatory burden for those PWR licensees who expect to exceed the existing requirements before the expiration of their licenses, while maintaining adequate safety, and may choose to comply with the final rule as an alternative to complying with the existing requirements. 
Agency: Nuclear Regulatory Commission(NRC)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Completed Actions 
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  01/04/2010  75 FR 13   
Final Rule Effective  02/03/2010    
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

Matthew Mitchell
Nuclear Regulatory Commission
Office of Nuclear Reactor Regulation,
Washington, DC 20555-0001
Phone:301 415-1467
Email: matthew.mitchell@nrc.gov