Document: NUREG-0800
Document ID: 786da65a-4915-4af3-afb3-678b7df5bea7
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070327.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
tion reviewed is similar to that reviewed for the auxiliary building. f. Other Structures In most plants, there are several miscellaneous seismic Category I structures and other structures that may be safety-related but, because of other design provision, may not be classified as seismic Category I. These structures are usually either of reinforced concrete or structural steel, or a combination thereof. The descriptive information reviewed for such structures is similar to that reviewed for the auxiliary building. Among such structures are pipe and electrical conduit tunnels, waste storage facilities, stacks, intake structures, pumping stations, and cooling towers. Further, the reviewer may encounter special safety-related structures such as emergency cooling water tunnels, embankments, concrete dams, and water wells. Such structures are reviewed on a case-by-case basis. The descriptive information provided is reviewed to understand the structural behavior of these structures, specifically during seismic events and plant process conditions during which such structures are required to remain functional. Further, the reviewer may encounter special structures that are not located in the immediate vicinity of the site. When the failure of any such structure could affect the safety of the plant, it should be designed to withstand the effects of a safe shutdown earthquake (SSE) and the surface faulting should be comparable to that of the nuclear plant itself. Examples of such structures include emergency cooling water tunnels, embankments, concrete dams, and water wells. These structures are reviewed on a case-by-case basis, and safety assessments should take into account the material underlying the structure and its location with respect to the site. The descriptive information provided is reviewed to ascertain the structural behavior of such structures, particularly with respect to seismic events and plant process conditions during which they are required to remain