Document: NUREG-0800
Document ID: 9c7116dd-39cd-47a9-b121-dce6f51adc77
Document Type: srp
Title: SUBCOMPARTMENT ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070620009.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.2
CFR Part: 
CFR Title: 

Content:
proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. Nodalization Schemes. The reviewer evaluates the nodalization of each subcompartment to determine the adequacy of the calculational model. As necessary, the reviewer performs iterative nodalization studies for subcompartments to confirm that the model includes sufficient nodes. 2. Initial Thermodynamic Conditions. The reviewer compares the initial subcompartment air pressure, temperature, and humidity conditions to the criteria in Subsection II of this SRP section to confirm that conservative conditions were selected. 3. Vent Flowpath and Distribution of Mass and Energy Released. The reviewer determines the adequacy of the information in the safety analysis report regarding subcompartment volumes, vent areas, vent resistances, and inertia terms. If a subcompartment must rely on doors, blowout panels, or equivalent devices to increase vent areas, or unique flow- limiting devices to control vent flows, the reviewer evaluates the analysis and testing programs that substantiate their use. The review of the mechanical and structural design of such flow control devices will be performed under SRP Sections 3.6.2 and 3.8.3. The reviewer evaluates the bases, correlations, and computer codes used to predict subsonic and sonic vent flow behavior and the capability of the code to model compressible and incompressible flow. The bases should include comparisons of the correlations to both experimental data and recognized alternate correlations that have been accepted by the staff. The reviewer may perform a confirmatory analysis of the blowdown mass and energy profiles within a subcompartment. The analysis is done using thermal-hydraulics computer codes that are acceptable to the responsible reviewing organization for the subject application. The purpose of the analysis is to confirm the predictions of the mass and energy release rates appearing in