Document: NUREG-0800
Document ID: c53cf2ef-5eb4-4449-bed4-17a9eff508e3
Document Type: srp
Title: SECONDARY CONTAINMENT FUNCTIONAL DESIGN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600406.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.3
CFR Part: 
CFR Title: 

Content:
outside environment. C. The compressive effect of primary containment expansion on the secondary containment atmosphere should be considered. D. Secondary containment in-leakage should be considered. 6.2.3-5 Revision 3 - March 2007 E. No credit should be taken for secondary containment out-leakage. F. For secondary containment response analyses 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 should be assumed. Any delay due to system design in secondary containment depressurization and filtration system actuation should be considered. G. Heat loads generated within the secondary containment (e.g., equipment heat loads) should be considered. H. Fan performance characteristics should be considered in evaluating secondary containment depressurization. 2. To meet the GDC 4 requirement to protect SSCs important to safety against dynamic effects, high-energy lines passing through the secondary containment should have guard pipes. Design criteria for guard pipes are in SRP Section 3.6.2. If there are no guard pipes, analyses should demonstrate that both primary containment and secondary containment structures are capable of withstanding the effects of a high-energy pipe rupture inside the secondary containment without loss of integrity. 3. In meeting GDC 16 requirements for the functional capability of the secondary containment, the following criteria apply: A. The secondary containment depressurization and filtration systems should meet the guidelines of Regulatory Guide (RG) 1.52 and be capable of maintaining a uniform negative pressure throughout the secondary containment as well as other areas served by the systems. B. The negative pressure differential to be maintained in the secondary containment and other contiguous plant areas should be