Document: NUREG-0800
Document ID: dfd1fbdb-0dd1-46f4-8489-99de53d66afc
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550054.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
ial 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 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. The staff will review the arrangement and configuration of these walls. Some recent design (e.g., AP600 and AP1000) 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 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 will be reviewed on a case-by-case basis. 3.8.4-4 Revision 2 - March 2007 2. Applicable Codes, Standards, and Specifications. The information pertaining to design codes, standards, specifications, regulatory guides, and other industry standards that are applied in the design, fabrication, construction, testing, and surveillance of Seismic Category I structures is reviewed. 3. Loads and Loading Combinations. The review encompasses information pertaining to the applicable design loads and various load combinations thereof. The loads normally