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:
the vent holes and the reinforced concrete section is relied upon for structural purposes, the criteria that apply to concrete portions of the drywell as described above will apply. (iib) If the main reinforcement of the drywell is terminated above the vent holes and two steel plates lining both faces of the drywell are a line utilized for structural purposes, the criteria that apply to steel portions of the drywell as described above will apply. (iiic) If other structural systems are used in the vent region, the loads and load combinations are reviewed and judged on a case-by-case basis. 3.8.3-25 DRAFT Rev. 2 - April 1996 4. Design and Analysis Procedures The design and analysis procedures utilized for the interior structures of the containment are acceptable if found in accordance with the following: a. For PWR Dry Containment Internal Structures (i)i. Primary Shield Wall and Reactor Cavity The design and analysis procedures utilized for the shield wall are acceptable if found in accordance with the ACI 349 Code (Ref. 2). 100 101 This code is based on the strength design method. However, use of the ACI 318 Code working stress design method, where actual elastic/linear stresses in the concrete and reinforcement are determined and compared with their corresponding allowables, is considered acceptable. Analyses for loss-of-coolant accidentLOCA loads applicable to the 102 primary shield wall, such as for the cavity differential pressure combined with pipe rupture reaction forces, are acceptable if these loads are treated as dynamic time-dependent loads whereby either a detailed time-history analysis is performed or a static analysis utilizing the peak of the forcing function amplified by an appropriate chosen dynamic factor is utilized. Elastic behavior of the wall should be maintained under the differential pressure. However, for the concentrated accident loads such as Y or Y , r j elasto-plastic behavior may be assumed as long as the reflections are limited to