Document: NUREG-0800
Document ID: 6de5c1bb-88d0-4d17-8255-a248a8db304a
Document Type: srp
Title: SUBCOMPARTMENT ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070487.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.1.2
CFR Part: 
CFR Title: 

Content:
e flow limiting devices to control vent flows, the SCSB reviews the analysis and testing programs that 29 substantiate their use. The EMEB and SEBECGB will evaluate the mechanical and structural 30 31 design of such flow control devices as part of their review responsibility under SRP Sections 3.6.2 and 3.8.3. The SCSB reviews the nodalization of each subcompartment to determine the adequacy of the calculational model. As necessary, SCSB performs iterative nodalization studies for 32 subcompartments to confirm that sufficient nodes have been included in the model. The SCSB compares the initial subcompartment air pressure, temperature, and humidity 33 conditions to the criteria given in subsection II, above, to assure that conservative conditions were selected. The SCSB reviews the bases, correlations, and computer codes used to predict subsonic and 34 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. DRAFT Rev. 3 - April 1996 6.2.1.2-6 Using the nodalization of each subcompartment as specified in the safety analysis report, the SCSB performs analyses using one of several available computer programs to determine the adequacy of the calculated peak differential pressure. The computer program used will depend upon the subcompartment under review as well as the flow regime. At the present time, the two programs used by the SCSB are RELAP-4 (Ref. 15)and COMPARE(Ref. 14). 35 36 At the construction permit or design certification stage, the SCSB will ascertain that the 37 38 subcompartment design procedures include appropriate margins above the calculated values, as given in subsection II, above. For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to