Document: NRC Regulatory Guide
Document ID: 9c99a4b7-8619-41f0-b716-262bfdb03941
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:
G-1330, Page C-10 II. Multiple Barriers Criterion mHTGR-DC Title and Content NRC Rationale for Adaptions to GDC (1) with a design capability for prompt hot shutdown of the reactor, including necessary instrumentation and controls to maintain the unit in a safe condition during hot shutdown, and (2) with a potential capability for subsequent cold shutdown of the reactor through the use of suitable procedures. III. Reactivity Control Criterion mHTGR-DC Title and Content NRC Rationale for Adaptions to GDC 20 Protection system functions. The protection system shall be designed (1) to initiate automatically the operation of appropriate systems, including the reactivity control systems, to ensure that the specified acceptable system radionuclide release design limits is not exceeded as a result of anticipated operational occurrences and (2) to sense accident conditions and to initiate the operation of systems and components important to safety. “Specified acceptable fuel design limits” has been replaced with SARRDLs. The concept of using SARRDLs is discussed for GDC 10. The quantitative value of the SARRDL will be design specific. The protection aspect of automatic operation, to protect normal operation and AOO limits, to sense accident conditions, and to initiate mitigating equipment has been preserved. 21 Protection system reliability and testability. Same as GDC 22 Protection system independence. Same as GDC 23 Protection system failure modes. Same as GDC 24 Separation of protection and control systems. Same as GDC APPENDIX C. MODULAR HIGH-TEMPERATURE GAS-COOLED REACTOR DESIGN CRITERIA Appendix C to DG-1330, Page C-11 III. Reactivity Control Criterion mHTGR-DC Title and Content NRC Rationale for Adaptions to GDC 25 Protection system requirements for reactivity control malfunctions. The protection system shall be designed to ensure that specified acceptable system radionuclide release design limits are not exceeded during any anticipated operational occurrence,