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:
trol 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, accounting for a single malfunction of the reactivity control systems. “Specified acceptable fuel design limits” is replaced with SARRDLs. The concept of using SARRDLs is discussed for GDC 10. 26 Reactivity control systems. Same as ARDC Reactivity control systems shall include the following capabilities: (1) A means of shutting down the reactor shall be provided to ensure that, under conditions of normal operation, including anticipated operational occurrences, and with appropriate margin for malfunctions, design limits for fission product barriers are not exceeded. (2) A means of shutting down the reactor and maintaining a safe shutdown under design-basis event conditions, with appropriate margin for malfunctions, shall be provided. A second means of reactivity control shall be provided that is independent, diverse, and capable of achieving and maintaining safe shutdown under design-basis event conditions. (3) A system for holding the reactor subcritical under cold conditions shall be provided. Recent licensing activity associated with the application of GDC 26 and GDC 27 to new reactor designs “Response to Gap Analysis Summary Report for Reactor System Issues,” (Ref. 26) and “Response to NuScale Gap Analysis Summary Report for Reactivity Control Systems, Addressing Gap 11, General Design Criteria 26,” (Ref. 27), revealed that additional clarity could be provided in the area of reactivity control requirements. ARDC 26 combines the scope of GDC 26 and GDC 27. The development of ARDC 26 is informed by the proposed General Design Criteria of 1965, AEC-R 2/49 and November 5, 1967 (32 FR 10216) (Ref. 28); the current GDC 26 and 27; the definition of safety-related SSC in 10 CFR 50.2; and SECY-94-084, “Policy and Technical Issues Associated with the Regulatory