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:
design conditions of the primary coolant boundary are not exceeded as a result of anticipated operational occurrences and (2) vital functions that rely on electric power are maintained in the event of postulated accidents. A reliable power system is required for SSCs during postulated accident conditions. Power systems shall be sufficient in capacity, capability, and reliability to ensure vital safety functions are maintained. The emphasis is placed on requiring reliability of power sources rather than prescribing how such reliability can be attained. Reference to onsite vs. offsite electric power systems was deleted to provide for those reactor designs that do not depend on offsite power for the functioning of SSCs important to safety. The text related to “…supplies, including batteries, and the onsite distribution system,” was deleted to allow increased flexibility in the design of onsite power systems for advanced reactor designs. APPENDIX B. SODIUM-COOLED FAST REACTOR DESIGN CRITERIA Appendix B to DG-1330, Page B-7 II. Multiple Barriers Criterion SFR-DC Title and Content NRC Rationale for Adaption to GDC The onsite electric power systems shall have sufficient independence, redundancy, and testability to perform their safety functions, assuming a single failure. However, such onsite systems are expected to remain capable of performing assigned safety functions during accidents as a condition of requisite reliability. “Reactor coolant pressure boundary” has been relabeled as “primary coolant boundary” to conform to standard terms used in the LMR industry. The existing single switchyard allowance remains available under ARDC 17. If a particular advanced design requires use of GDC single switchyard allowance wording, the designer should look to GDC 17 for guidance when developing PDC. If electrical power is not required to permit the functioning of SSCs important to safety, the requirements in the SFR-DC are not applicable to the design. In this case,