Document: NUREG-0800
Document ID: 0c95c042-addf-4bad-84f5-1d1692769268
Document Type: srp
Title: CONCRETE AND STEEL INTERNAL STRUCTURES OF STEEL OR CONCRETE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550052.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.3
CFR Part: 
CFR Title: 

Content:
uch pressures are reviewed in accordance with guidance provided in SRP Section 6.2.1. Other LOCA loads that apply are those transmitted to the wall through the reactor supports, including pipe rupture reaction forces which may induce simultaneous shear forces, torsional moments, and bending moments at the base of the wall. The elevated temperature within and around the primary shield created by the accident may also produce transient thermal gradients across the thick wall. The review evaluates these design and analysis procedures accordingly. 3.8.3-9 Revision 2 - March 2007 iii. Secondary Shield Walls The secondary shield walls surrounding the primary loops and supporting the operating floor should be designed for loads similar to those applicable to the primary shield wall, including loads of fluid jets from a postulated break of a primary pipe which can impinge on them. The analytical techniques used for these walls are reviewed, including their structural framing and behavior under loads. When elasto-plastic behavior is assumed and the ductility of the walls is relied upon to absorb the energy associated with jet loads, the review evaluates the procedures and assumptions, with particular emphasis on such areas as modeling techniques, boundary conditions, force-time functions, and assumed ductility. For the time-dependent differential pressure, however, elastic behavior is required, and the review considers the methods of determining an equivalent static load accordingly. iv. Other Interior Structures Many of the other interior structures reviewed are combinations of slabs, walls, beam, and columns classified as Category I structures. These structures are subjected to most of the loads and load combinations described in Subsection I.3 of this SRP section. The review evaluates the analytical techniques for these structures on the same basis as the review of the structures described above. B. PWR Ice-Condenser Containment Internal Structures i. Divider Barrier