Document: NUREG-0800
Document ID: ff35052f-d051-4098-a352-1e382f87365a
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340655.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
e TMD code, the CSB reviews the modeling of the containment subcompart- ments, the size and area of assumed vents between nodes, volumes of nodes, the flow loss coefficients for each vent modeled, and the heat transfer coefficients within the ice condenser. The CSB will determine from the safety analysis report that the TMD code, without the "augmented flow" correlation, has been utilized to determine the transient pressure response in each subcompartment that contains a high energy line, and in adjoining subcompartments. 6.2.1.1.B-6 Rev. 2 - July 1981 The CSB reviews the maximum calculated differential pressures and pressure profiles for each subcompartment. For plants at the construction permit stage of review, the CSB will ascertain that it is the applicant's intent to design all internal structures with.a margin of 40Z between the maximum calculated differential pressure and the design differential pressure of the structure or component. At the operating license stage of review, the CSB will ascertain that an appropriate margin exists. However, changes in technology and calculational methods may affect the margin. The CSB will then determine that the maximum calculated differential pressures do not exceed the design differential pressures for the internal structures. When maximum calculated differential pressures which exceed the pressures used in the design of the internal structures are identified, the CSB will request the SEB to evaluate the adequacy of the affected internal structures. The loads on components or their supports installed within the compartment due to possible pressure gradients will be evaluated by MEB. The CSB will coordinate the review of dynamic pressure loads for components and equipment supports, and when the design basis loads have been identified the CSB will request the MEB to evaluate the design adequacy of the components and supports. Modification to the RELAP4 code to include two-phase, two-component mixtures and ice condenser