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:
ems. GDC 18 is a design-independent companion criterion to GDC 17. Wording pertaining to additional system examples has been deleted to allow increased flexibility associated with various designs. The text related to the nuclear power unit, offsite power system, and onsite power system was deleted to be consistent with mHTGR-DC 17. 19 Control room. Same as ARDC A control room shall be provided from which actions can be taken to operate the nuclear power unit safely under normal conditions and to maintain it in a safe condition under accident conditions. Adequate radiation protection shall be provided to permit access and occupancy of the control room under accident conditions without personnel receiving radiation exposures in excess of 5 rem total effective dose equivalent as defined in § 50.2 for the duration of the accident. Adequate habitability measures shall be provided to permit access and occupancy of the control room during normal operations and under accident conditions. Equipment at appropriate locations outside the control room shall be provided The criterion was updated to remove specific emphasis on LOCAs, which may be not appropriate for advanced designs such as the mHTGR. Reference to “whole body, or its equivalent to any part of the body” has been updated to the current total effective dose equivalent standard as defined in § 50.2. A control room habitability requirement beyond that associated with radiation protection has been added to address the concern that non-radionuclide accidents may also affect control room access and occupancy. The last paragraph of the GDC has been eliminated for the mHTGR-DC because it is not applicable to future applicants. APPENDIX C. MODULAR HIGH-TEMPERATURE GAS-COOLED REACTOR DESIGN CRITERIA Appendix C to DG-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