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:
equences of a Loss-of-Coolant Accident for Boiling-Water Reactors” (Ref. 12), and RG 1.4, “Assumptions Used for Evaluating the Potential Radiological Consequences of a Loss-of-Coolant Accident for Pressurized-Water Reactors” (Ref. 13)] that exceed 0.5 rem to the whole body or its equivalent to any part of the body; only single component failures need be assumed for those systems located in Seismic Category I structures, and no credit should be taken for automatic isolation from other components in the system or for treatment of released material, unless the isolation or treatment capability is designed to the appropriate seismic and quality group standards and can withstand loss of offsite power and a single failure of an active component. 4 Components in influent lines may be classified as Quality Group D if they are capable of being isolated from the reactor coolant pressure boundary by an additional valve that has high leaktight integrity. 5 As noted above, RG 1.143 provides specific guidance on the classification of radioactive waste management systems. RG 1.26, Rev. 5, Page 9 3. Quality Group D The Quality Group D standards given in Table 1 on page 7 of this guide should be applied to water- and steam-containing components that are not part of the reactor coolant pressure boundary or included in Quality Groups B or C, but are part of systems or portions of systems that contain or may contain radioactive material. Table 1 Components QUALITY STANDARDS Quality Group B Quality Group C Quality Group D Pressure Vessels ASME BPV Code, Section III, “Rules for Construction of Nuclear Facility Components,”6 Class 2 ASME BPV Code, Section III, “Rules for Construction of Nuclear Facility Components,”6 Class 3 ASME BPV Code, Section VIII, Division 1, “Rules for Construction of Pressure Vessels” (Ref. 14) Piping Class 2 Class 3 ASME B31.1 (Ref. 15) Pumps Class 2 Class 3 Manufacturers’ standards Valves Class 2 Class 3 ASME B31.1 Atmospheric Storage Tanks