Document: NUREG-0800
Document ID: 73dc4705-6dff-4f44-87ee-2a6f76cc6536
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A258.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
. 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 structures, particularly with respect to seismic events and plant process conditions during which they are required to remain functional. G. Masonry Walls If used, these are walls, partitions, or radiation shields which are components of the structures listed above. They are constructed of concrete masonry units bonded with mortar in single or multiple widths and may be reinforced horizontally as well as vertically. Masonry walls without reinforcement should not be used to support seismic Category I structures, systems, and components (SSCs) nor in areas that contain seismic Category I SSCs. The staff will review the arrangement and configuration of these walls. Some designs use modular construction methods for the major seismic Category I structures. Wall modules are typically constructed from large prefabricated sections of steel plates spaced apart with intermittent steel members, joined with other modules at the site, and then filled with concrete. The concrete fill used in wall modules could be structural concrete with reinforcing (composite construction), or fill concrete of low strength and no 3.8.4-4 Revision 4 – September 2013 reinforcing, or heavy concrete for radiation shielding. Floor modules consist of prefabricated steel members and plates which are combined with poured concrete to create a composite section. The design of modules to nuclear power plants, structural module design, fabrication, configuration, layout, and connections are reviewed on a case-by-case basis. 2. Applicable Codes, Standards, and Specifications. The information pertaining to design codes,