Document: NUREG-0800
Document ID: 215ec1da-bdbb-48d3-b871-6010c1f4bc55
Document Type: srp
Title: SEISMIC SUBSYSTEM ANALYSIS REVIEW RESPONSIBILITIES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A239.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.3
CFR Part: 
CFR Title: 

Content:
at the base of the tank should be obtained by the modal and spatial combination methods discussed in Subsection II of SRP Section 3.7.2. The uplift tension resulting from Mo should be resisted either by tying the tank to the foundation with anchor bolts, etc., or by mobilizing enough fluid weight on a thickened base skirt plate. The latter method of resisting Mo should be shown to be conservative. F. The seismically induced hydrodynamic pressures on the tank shell at any level can be determined by the modal and spatial combination methods in SRP Section 3.7.2. The maximum hoop forces in the tank wall should be evaluated with due regard for the contribution of the vertical component of ground shaking. 3.7.3-9 Revision 4 – September 2013 The effects of SSI should be considered in this evaluation unless justified otherwise. The hydrodynamic pressure at any level should be added to the hydrostatic pressure at that level to determine the hoop tension in the tank shell. G. Either the tank top head should be located at an elevation higher than the slosh height above the top of the fluid or else should be designed for pressures resulting from fluid sloshing against this head. H. At the point of attachment, the tank shell should be designed to withstand the seismic forces imposed by the attached piping. An appropriate analysis should be performed to verify this design. I. The tank foundation (see also SRP Section 3.8.5) should be designed to accommodate the seismic forces imposed on it. These forces include the hydrodynamic fluid pressures imposed on the base of the tank as well as the tank shell longitudinal compressive and tensile forces resulting from Mo. J. In addition to the above, the tank should be designed to not allow buckling of tank walls and roof, failure of connecting piping, and sliding of the tank. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the