Document: NUREG-0800
Document ID: a09b1666-b289-4ea9-9e8f-3ee5fbd5bf41
Document Type: srp
Title: CONCRETE AND STEEL INTERNAL STRUCTURES OF STEEL OR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A250.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.3
CFR Part: 
CFR Title: 

Content:
in a similar manner. Because the structural integrity of the drywell and, to a certain extent, its leak tight integrity are critically important to the proper functioning of the pressure-isuppression system, the drywell is treated, for design and testing purposes only, in a manner similar to the containment itself. Accordingly, for the concrete pressure-resisting portions of the drywell, the loads and loading combinations of Article CC-3000 of ASME Code, Section III, Division 2, will apply, with additional criteria provided by applicable portions of SRP Section 3.8.1 and RG 1.136. For steel components of the drywell that resist pressure and are not backed by concrete, the appropriate sections of Subsection NE of ASME Code, Section III, Division 1, should be used, with additional guidance provided by applicable portions of SRP Section 3.8.2 and RG 1.57. Specifically, the loads and load combinations of Subsection II.3 of SRP Section 3.8.2 apply. Additional criteria presented in Subsection II.3.A of this SRP section are also applicable to the BWR containment drywell. For the lower vent portion of the drywell, the following conditions apply: i. If the main reinforcement of the drywell is carried down between 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. ii. If the main reinforcement of the drywell is terminated above the vent holes, and two steel plates lining both faces of the drywell are used for structural purposes, the criteria that apply to steel portions of the drywell as described above will apply. iii. 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. 4. Design and Analysis Procedures. The design and analysis procedures used for the containment internal structures are acceptable if found to be in accordance with the following: A. PWR Dry