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:
ures, systems, and components important to safety to an ultimate heat sink shall be provided, as necessary, to transfer the combined heat load of these structures, systems, and components under normal operating and accident conditions. Suitable redundancy in components and features and suitable interconnections leak detection, and isolation capabilities shall be provided to ensure that the system safety function can be accomplished, assuming a single failure. This mHTGR-DC accounts for advanced reactor design system differences to include cooling requirements for SSCs important to safety, if applicable; this mHTGR-DC does not address the residual heat removal system required under ARDC 34. The staff inserted “passive” based on the system design for residual heat removal. If a specific mHTGR design can demonstrate that the reactor cavity cooling system (RCCS) provides indefinite core cooling capability, then structural and equipment cooling systems would not be needed. The GDC reference to electric power was removed. Refer to the rationale for ARDC 17 on electric power systems. 45 Inspection of structural and equipment cooling systems. Same as ARDC The structural and equipment cooling systems shall be designed to permit appropriate periodic inspection of important This renamed mHTGR-DC accounts for advanced reactor system design differences to include possible cooling requirements for SSCs important to safety. APPENDIX C. MODULAR HIGH-TEMPERATURE GAS-COOLED REACTOR DESIGN CRITERIA Appendix C to DG-1330, Page C-21 IV. Fluid Systems Criterion mHTGR-DC Title and Content NRC Rationale for Adaptions to GDC components, such as heat exchangers and piping, to assure the integrity and capability of the systems. 46 Testing of structural and equipment cooling systems. Same as ARDC The structural and equipment cooling systems shall be designed to permit appropriate periodic functional testing to assure (1) the structural and leaktight integrity of their components, (2) the