Document: NRC Regulatory Guide
Document ID: 70415715-297f-4d60-841c-514b0372a131
Document Type: regulatory_guide
Title: 02/2017 (Rev. 5)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1608/ML16082A501.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.26
CFR Part: 
CFR Title: 

Content:
The OM Code specifies that its scope includes: (a) pumps and valves that are required to perform a specific function in shutting down a reactor to the safe shutdown condition, in maintaining the safe shutdown condition, or in mitigating the consequences of an accident; (b) pressure relief devices that protect systems or portions of systems that perform one or more of the three functions identified in (a) above; and (c) dynamic restraints (snubbers) used in systems that perform one or more of the three functions identified in (a) above, or to ensure the integrity of the reactor coolant pressure boundary. A user of RG 1.26 should confirm that its classification process considers the scope of pumps, valves, and dynamic restraints specified in ASME OM Code. As mentioned above, RG 1.201 provides guidance for complying with the NRC’s voluntary requirements in 10 CFR 50.69. RG 1.201 specifies regulatory positions for the acceptable use of the process described in Nuclear Energy Institute (NEI) 00-04, “10 CFR 50.69 SSC Categorization Guideline” (Ref. 10), to determine the safety significance of SSCs and place them into the appropriate risk-informed safety class (RISC) categories. Through this process, the safety significance of SSCs is determined using an integrated decision-making process, which incorporates both risk and traditional engineering insights. The process considers the safety functions of SSCs to include both the design-basis functions (derived from the safety-related definition) and functions credited for preventing and/or mitigating severe accidents. A user of RG 1.26 should be aware of the differences in the safety classification process in RG 1.201 when 10 CFR 50.69 will be implemented. Harmonization with International Standards The International Atomic Energy Agency (IAEA) has established a series of safety guides and standards constituting a high level of safety for protecting people and the environment. IAEA safety guides present international