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:
. 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 provided with guard pipes. Design criteria for guard pipes are given in SRP Section 3.6;2. If guard pipes are not provided, analyses should be provided which demon- strate that both the primary containment structure. and the secondary con- tainment structure are capable of withstanding the effects of a high energy pipe rupture occurring inside the secondary containment without loss of integrity. 3. In meeting the requirements of GDC 16, regarding 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 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 no less than 0.25 inches (water) when compared with adjacent regions, under all wind conditions up to the wind speed at which diffusion becomes great enough to assure site boundary exposures less than those calculated for the design basis accident even if exfiltration occurs. If the leakage rate is in excess of 100% of the volume per day, a special exfiltration analysis should be performed. c. All openings, such as personnel doors and equipment hatches, should be under administrative control. These openings should be provided with position indicators and alarms having readout and alarm capabil- ity in the main control room. The effect of open doors or hatches on the functional capability of the depressurization and filtration systems should be evaluated and confirmatory preoperational tests conducted. d. Some plants may have only portions of the primary