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:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of containment integrity Secondary - None The responsible organization reviews the information presented by the applicant in the safety analysis report (SAR) concerning the determination of the design differential pressure values for containment subcompartments. A subcompartment is defined as any fully or partially enclosed volume within the primary containment that houses high-energy piping and would limit the flow of fluid to the main containment volume in the event of a pipe rupture within the volume. This is referred to as an internal compartment in general design criterion (GDC) 50, of Appendix A to 10 CFR Part 50. A short-term pressure pulse would exist inside a containment subcompartment following a pipe rupture within the volume. This pressure transient would produce a pressure differential across the walls of the subcompartment which would generally reach a maximum value within the first second after blowdown begins. The magnitude of this maximum value is a function of several parameters, which include blowdown mass and energy release rates, subcompartment volume, vent area, and vent flow behavior. A transient differential pressure response analysis should be provided for each subcompartment or group of subcompartments that meets the above definition. I. AREAS OF REVIEW The specific areas of review are as follows: 6.2.1.2-2 Revision 3 - March 2007 1. Nodalization Schemes: The basis for the nodalization within each subcompartment is reviewed. 2. Initial Thermodynamic Conditions: The initial thermodynamic conditions within each subcompartment are reviewed to ensure the selection of values that maximize the resultant differential pressure. 3. Vent Flow Path and Distribution of Mass and Energy Released: The nature of each vent flow path considered, the distribution of the mass and energy released, and the extent of entrainment assumed in the vent flow mixture is reviewed. The review may