Document: NUREG-0800
Document ID: 129133a3-2833-4da5-a564-052efbadbeb2
Document Type: srp
Title: but as applied to Category I subsystems.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070319.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
owing items should be considered in the analysis: a. Two types of groundshaking-induced loadings must be considered for design. (i) Relative deformations imposed by seismic waves traveling through the surrounding soil or by differential deformations between the soil and anchor points. (ii) Lateral earth pressures and ground-water effects acting on structures. b. The effects of static resistance of the surrounding soil on piping deformations or displacements, differential movements of piping anchors, bent geometry and curvature changes, etc., should be adequately considered. Procedures using the principles of the theory of structures on elastic foundations are acceptable. c. When applicable, the effects due to local soil settlements, soil arching, etc., should also be considered in the analysis. DRAFT Rev. 3 - April 1996 3.7.3-6 d. Actual methods used for determining the design parameters associated with seismically induced transient relative deformations are reviewed and accepted on a case-by-case basis. Additional information, for guidance purposes only, can be found on page 26 of NUREG/CR-1161 (Reference 35) and in Section 3.5.2 of 17 ASCE Std 4-86 (Reference 46) . 18 13. Methods for Seismic Analysis of Category I Concrete Dams For the analysis of all Category I concrete dams, an appropriate approach that takes into consideration the dynamic nature of forces (due to both horizontal and vertical earthquake loadings), the behavior of the dam material under earthquake loadings, soil-structure interaction (SSI) effects, and nonlinear stress-strain relations for the soil, should be used. Analysis of earthen dams is reviewed under SRP Section 2.5.6. 19 14. Methods for Seismic Analysis of Above-Ground Tanks Most above-ground fluid-containing vertical tanks do not warrant sophisticated, finite element, fluid-structure interaction analyses for seismic loading. However, the commonly used alternative of analyzing such tanks by the "Housner-method" described in TID-7024