Document: NUREG-0800
Document ID: 7e0d3b3e-62c3-4492-ba89-6cebb4e82234
Document Type: srp
Title: SECONDARY CONTAINMENT FUNCTIONAL DESIGN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340701.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.3
CFR Part: 
CFR Title: 

Content:
-coolant accident occur- ring in the primary containment should be based on the following guidelines: a. Heat transfer from the primary to secondary containment should be considered. (1) Heat transfer from the primary containment atmosphere to the primary containment structure should be calculated using conser- vative heat transfer coefficients such as those provided in Branch Technical Position CSB 6-1 (Ref. 6). (2) Conductive heat transfer through the primary containment struc- ture and convective heat transfer to the secondary containment atmosphere should be considered. (3) Radiant heat transfer to the secondary containment should be considered. b. Adiabatic boundary conditions should be assumed for the surface of the secondary containment structure exposed to the outside environment. c. The compressive effect of primary containment expansion on the secon- dary containment atmosphere should be considered. d. Secondary containment inleakage should be considered. e. No credit should be taken for secondary containment outleakage. f. Secondary containment response analyses should be based on the assump- tion of loss of offsite power and the most severe single active failure in the emergency power system (e.g., a diesel generator failure), in the primary containment heat removal systems, in the core cooling systems, or in the secondary containment depressurization and filtration system. Any delay, due to system design, in actuating the 6.2.3-3 Rev. 2 - July 1981 secondary containment depressurization and filtration system should be considered. g. Heat loads generated within the secondary containment (e.g., equipment heat loads) should be considered. h. Fan performance characteristics sbould be considered in evaluating the depressurization of the secondary containment. 2. In meeting the requirement of GDC 4 to project structures, systems and components important to safety against dynamic effects, high energy lines I passing through the secondary containment should be