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NRC

RIN: 3150-AH29

Publication ID: Fall 2008

Title: Large Break Loss-of-Coolant Accident (LB-LOCA) Redefinition
Abstract: The proposed rule would amend the Commission's regulations to allow for a risk-informed alternative to the present loss-of-coolant accident (LOCA) break size. This rulemaking would address a petition for rulemaking submitted by the Nuclear Energy Institute (NEI) (PRM-50-75). A draft final rule was provided to the Advisory Committee on Reactor Safeguards (ACRS) on October 16, 2006. After reviewing the draft rule, the ACRS informed the Commission of numerous technical and policy concerns and recommended that the rule not be issued. The staff prepared a Commission paper (SECY-07-0082; May 16, 2007) to inform the Commission of the impact of the ACRS recommendations and to request guidance before proceeding with the rule. The Commission provided its guidance in a Staff Requirements Memorandum on August 10, 2007. On April 1, 2008, the staff provided a revised final rule to the Commission. The staff now plans to discuss the rule with stakeholders in a public meeting in late 2008, and to provide a final rule package to the Commission in September 2009.
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	11/07/2005	70 FR 67597
NPRM Comment Period End	02/06/2006
NPRM Comment Period Extended	01/25/2006	71 FR 4061
NPRM Comment Period End	03/08/2006
Final Rule	09/00/0009

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: Richard F. Dudley Nuclear Regulatory Commission Office of Nuclear Reactor Regulation, Washington, DC 20555-0001 Phone:301 415-1116 Email: richard.dudley@nrc.gov