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:
view 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 Because 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 treated on the same basis as the containment. The loads that usually govern the design of the divider barrier are those induced by the LOCA, including the time-dependent differential pressure across the barrier and any concurrent concentrated jet impingement loads. Because the divider barrier is typically a combination of walls and slabs framed together, the design and analysis procedures are conventional. The review evaluates them accordingly, with an emphasis on the assumed boundary conditions and behavior under loads. Since the differential pressure and jet impingement loadings are dynamic impulsive loads that vary with time, the review considers the techniques used to determine their equivalent static loads. 3.8.3-10 Revision 2 - March 2007 ii. Ice-Condenser The design of the ice-condenser and its various components may be based on a combination of analysis and testing. The review includes the analytical and testing procedures for the ice baskets and brackets (couplings), the lattice frames and columns, including attachments; the supporting structures comprising the lower supports; the wall panels; and cooling duct and supports of various auxiliary components. The ice-condenser and its components should be analyzed or tested for various loads and combinations thereof, including dead and live loads, thermal loads induced by differential thermal expansion within the various elements, seismic loads, and loads induced by a LOCA. Accident loads include pressure differential drag loads and loads induced by the change of momentum of the flowing steam. Elastic analysis is usually used