Document: NRC Regulatory Guide
Document ID: da269da5-7390-4252-b08f-bdb7aeb8beaf
Document Type: regulatory_guide
Title: Developing Principal Design Criteria for Non-Light Water Reactors + HISTORY - HISTORY 02/2017 – DG-1330 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1630/ML16301A307.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.232
CFR Part: 
CFR Title: 

Content:
tion valve inside and one automatic isolation valve outside containment. A simple check valve may not be used as the automatic isolation valve outside containment; or (4) One automatic isolation valve inside and one automatic isolation valve outside containment. A simple check valve The word “structure” was added to this SFR-DC to clearly convey the understanding that this criterion only applies to designs employing containment structures. In some cases, the word “the” was also added to make the phrase grammatically correct. The title of SFR-DC 55 is the “Primary coolant boundary penetrating containment.” The SFR intermediate loop is a separate closed system that does not allow any direct mixing of intermediate fluid with the primary coolant sodium. The tubing of the IHX and associated intermediate loop piping inside the reactor vessel are a part of the primary coolant boundary. SFR-DC 57, “Closed system isolation valves,” addresses closed systems that penetrate containment and would be the appropriate place to address a closed system, such as an intermediate loop, that penetrates containment and is not part of the primary coolant boundary (in its entirety). This is similar to the treatment of the main steam system and the steam generator in a pressurized-water reactor. APPENDIX B. SODIUM-COOLED FAST REACTOR DESIGN CRITERIA Appendix B to DG-1330, Page B-26 V. Reactor Containment Criterion SFR-DC Title and Content NRC Rationale for Adaption to GDC may not be used as the automatic isolation valve outside containment. Isolation valves outside containment shall be located as close to containment as practical and, upon loss of actuating power, automatic isolation valves shall be designed to take the position that provides greater safety. Other appropriate requirements to minimize the probability or consequences of an accidental rupture of these lines or of lines connected to them shall be provided as necessary to ensure adequate safety. Determination of