Document: NRC Regulatory Guide
Document ID: 1f8fd3ff-bc9e-4b84-b4d9-71d2a51882f7
Document Type: regulatory_guide
Title: Seismic Design Classification for Nuclear Power Plants + HISTORY - HISTORY DG-1315 , Proposed Revision 5, published 09/2015 DG-1156 , Proposed Revision 4, published 10/2006 (Rev. 5)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1506/ML15061A048.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.29
CFR Part: 
CFR Title: 

Content:
quences of an accident; Several key examples of systems included in items 1.c and 1.d are provided below for reference, but do not represent the complete scope of these items. Determining the complete scope of these items is the applicant’s or licensee’s responsibility. o Those portions of the steam systems of boiling-water reactors extending from the 1 The system boundary includes those portions of the system required to accomplish the specified safety function and connected piping up to and including the second isolation valve or outboard containment isolation valve, such that the effects of an earthquake on non-seismic Category I portions of systems may be isolated from seismic Category I portions. This footnote applies wherever the phrase “systems or portions thereof” appears in this guide. DG-1315, Page 5 outermost containment isolation valve up to but not including the turbine stop valve, and connected piping of a nominal size of 6.35 cm (2.5 inches) or larger, up to and including the first valve that is either normally closed or capable of automatic closure during all modes of normal reactor operation (the turbine stop valve should be designed to withstand the SSE and maintain its integrity). o Those portions of the steam and feedwater systems of pressurized-water reactors extending from and including the secondary side of steam generators up to and including the outermost containment isolation valves, and connected piping of a nominal size of 6.35 cm (2.5 inches) or larger, up to and including the first valve (including a safety or relief valve) that is either normally closed or capable of automatic closure during all modes of normal reactor operation. o The spent fuel storage pool structure, including the fuel racks. o The reactivity control systems (e.g., control rods, control rod drives, and boron injection system). o The control room, including its associated equipment and all equipment needed to maintain the control room within safe habitability