Document: NUREG-0800
Document ID: 34819bc5-4c15-4da7-8de9-4ab5944771a7
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100630323.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
the descriptive information 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 provisions, may not be classified as Seismic Category I. These structures are usually made either of reinforced concrete or structural steel, or a combination of the two. 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, water and fuel tanks, waste storage facilities, stacks, intake structures, pumping stations, and cooling towers. Distribution systems including their supports (e.g., cable trays, conduit, heating, ventilation, and air conditioning, and piping), and equipment supports are reviewed in accordance with SRP Sections 3.9.2 and 3.9.3. Intervening structural elements between these supports and building structural steel/concrete (e.g., steel platforms, building frame members, embedment plates, and building steel members beyond the jurisdictional boundary of supports to mechanical components) are reviewed under this SRP section. 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 consider the material underlying the structure and its location with respect to the site. The staff will review the descriptive information provided to ascertain the structural behavior of such