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NRC RIN: 3150-AI01 Publication ID: Spring 2007 
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 staff proposes to revise the screening limits to reflect the updated technical basis in the proposed rule. 
Agency: Nuclear Regulatory Commission(NRC)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed 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  06/00/2007    
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No 
Included in the Regulatory Plan: No 
Agency Contact:
George M. Tartal
Nuclear Regulatory Commission
Office of Nuclear Material Safety and Safeguards,
Washington, DC 20555-0001
Phone:301 415-0016
Email: george.tartal@nrc.gov