Document: NUREG-0800
Document ID: ab4f353d-c299-479d-ab25-834f97196988
Document Type: srp
Title: CONCRETE AND STEEL INTERNAL STRUCTURES OF STEEL OR CONCRETE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070326.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.3
CFR Part: 
CFR Title: 

Content:
l 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. Further, the elevated temperature within and around the primary shield created by the accident may produce transient thermal gradients across the thick wall. Design and analysis procedures for such accident effects are accordingly reviewed. 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 these walls. The analytical techniques utilized for these walls are reviewed, including their structural framing and behavior under loads. Where elasto-plastic behavior is assumed and the ductility of the walls is relied upon to absorb the energy associated with jet loads, the procedures and assumptions are reviewed 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 methods of determining an equivalent static load are accordingly reviewed. iv. Other Interior Structures Most of the other interior structures that are also reviewed are combinations of slabs, walls, beam, and columns; classified as Category I structures; and subjected to most of the loads and combinations 28 described in subsection I.3 of this SRP section. Analytical techniques for these structures are reviewed on the same basis as for the structures described above. b. For PWR Ice-Condenser Containment Internal Structures i. Divider Barrier Since the divider barrier has to maintain a certain degree of leaktightness during a LOCA and is thus a critical structure with respect to the proper functioning of the containment, it is