Decoupling of Assumed Loss-of-Offsite Power from Large Break Loss-of-Coolant Emergency Core Cooling System Analysis

Docket ID: NRC-2008-0602
Agency: Nuclear Regulatory Commission (NRC)

The proposed rule would amend Part 50, Appendix A, Criterion 35, to eliminate, based on appropriate risk considerations, the assumption of a LOOP coincident with a postulated large-break (low-frequency) loss-of-coolant accident. The proposed rule would provide a voluntary alternative to existing requirements for satisfying specified acceptance criteria, and would consider, in part, PRM-50-77.  Commission direction in SRM-SECY-09-0140 approved placing this rulemaking on hold pending further development on other related rulemakings.


RIN: 3150-AH43
Impacts and Effects: None
CFR Citation: 10 CFR 50
Priority: Substantive, Nonsignificant
UA and Regulatory Plan Information open glossary dialog  
Publication Period: Spring 2015
Agenda Stage of Rulemaking: Long-term Action
Major Rule: Undetermined
Legal Authorities: 42 U.S.C. 2201; 42 U.S.C. 5841
Legal Deadlines: None
Government Levels Affected: No
Federalism Implications: No
Unfunded Mandates: No
Requires Regulatory Flexibility Analysis: No
Small Entities Affected: No
International Impacts: No
Included in Regulatory Plan: No
ActionDateFR Citation
Docket Details open glossary dialog  
Related RINs: None
Related Dockets: None
Keyword(s): ECCS, LOCA, LOOP
Type: Rulemaking

Primary Documents

View All  (1)
Comments Not Accepted
Proposed Rule
Posted: 04/13/2009
ID: NRC-2008-0602-0001

Supporting Documents

No documents available.


No comments posted.

Comments Received*
Regulatory Timeline
Pre Rule
Current Stage
Proposed Rule
Current Stage
Final Rule
Current Stage
Long Term Action
Current Stage
Agency Contact
Richard F. Dudley
301 415-1116
Office of Nuclear Reactor Regulation
Washington, DC 20555-0001
*This count refers to the total comment/submissions received on this docket, as of 11:59 PM yesterday. Note: Agencies review all submissions, however some agencies may choose to redact, or withhold, certain submissions (or portions thereof) such as those containing private or proprietary information, inappropriate language, or duplicate/near duplicate examples of a mass-mail campaign. This can result in discrepancies between this count and those displayed when conducting searches on the Public Submission document type. For specific information about an agency’s public submission policy, refer to its website or the Federal Register document.