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:
GDC safety functions of structures, systems, and components important to safety are maintained. Special features, such as inerted enclosures or guard vessels, shall be provided for systems containing sodium. NUREG-1368 (Ref. 4) (page 3-56), Section 3.2.4.1, suggested the need for a separate criterion for protection against sodium reactions. Also, a separate criterion was included in NUREG-0968 (Ref. 5) (Criterion 4, “Protection against Sodium and NaK reactions”). 74 Sodium/water reaction prevention/mitigation. Structures, systems, and components containing sodium shall be designed and located to avoid contact between sodium and water and to limit the adverse effects of chemical reactions between sodium and water on the capability of any structure, system, or component to perform any of its intended safety functions. If steam-water is used for energy conversion, to prevent loss of any plant safety function, the sodium-steam generator system shall be designed to detect and contain sodium-water reactions and limit the effects of the energy and reaction products released by such reactions, including mitigation of the effects of any resulting fire involving sodium. The NRC considered DOE’s proposed SFR-DC 74 and made changes based on the “Response to NRC Staff Questions on the U.S. Department of Energy Report, ‘Guidance for Developing Principal Design Criteria for Advanced Non-Light Water Reactors’” (pages 16–18). NUREG-1368 (Ref 4) (page 3-56), Section 3.2.4.1, suggested the need for a separate criterion for protection against sodium reactions. Also, a separate criterion was included in NUREG-0968 (Ref. 5) (Criterion 4, “Protection against Sodium and NaK reactions”). Fire considerations are added for consistency with SFR-DC 73. 75 Quality of the intermediate coolant boundary. Components that are part of the intermediate coolant boundary shall be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the