Document: NUREG-0800
Document ID: 00049a4f-6345-4415-8ec0-0e63d8d04990
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070482.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
and pressure profiles for each subcompartment. For plants at the construction permit stage of review, the SCSB will ascertain that it is the applicant's intent to design all internal structures with a margin of 40% between the maximum calculated differential pressure and the design differential pressure of the structure or component. Design certification applicants should also be reviewed against the 40% margin for containment internal structure design differential pressure. At the operating license stage of review, the 54 SCSB will ascertain that an appropriate margin exists. However, changes in technology and calculational methods may affect the margin. The SCSB 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 SCSB will request the SEBECGB to evaluate the adequacy of the affected internal structures. 55 The loads on components or their supports installed within the compartment due to possible pressure gradients will be evaluated by EMEB. The SCSB will coordinate the review of dynamic pressure loads for components and equipment supports, and when the design basis loads have been identified the SCSB will request the EMEB to evaluate 56 57 the design adequacy of the components and supports. Modification to the RELAP4 code (Reference 12) to include two-phase, 58 two-component mixtures and ice condenser modeling have been made. This will improve the capability of the code for use in short-term response analysis of ice condenser plants. The SCSB will use the RELAP4 code to conduct confirmatory 59 6.2.1.1.B-11 DRAFT Rev. 3 - April 1996 analyses. The COMPARE code (Reference 11) is also being modified to permitused 60 for the short term response analysis of ice condenser plants. 61 4. The SCSB reviews the methods, input assumptions, and