Document: NUREG-0800
Document ID: 42f941d3-4815-4bc5-bf81-f2dab04a7aa7
Document Type: srp
Title: SECONDARY CONTAINMENT FUNCTIONAL DESIGN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070459.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.3
CFR Part: 
CFR Title: 

Content:
ted systems be provided to establish an essentially leak-tight barrier against the uncontrolled release of radioactivity to the environment. The secondary containment minimizes radioactive releases by confining primary containment leakage following a LOCA. Application of GDC 16 to the secondary containment minimizes the likelihood and magnitude of radiation exposures to control room personnel and the public resulting from radioactive releases. 3. GDC 43 requires that containment atmosphere cleanup systems be designed to permit appropriate periodic pressure and functional testing to assure component integrity, the operability of active components, the operability of the system as a whole, and the performance of the operational sequence that brings the system into operation. The depressurization and filtration systems associated with secondary containment confine radioactive material in the event of primary containment leakage. Application of GDC 43 to these systems assures that capabilities to perform this function can be periodically verified and deficiencies identified and corrected to minimize the likelihood of demand and inservice failures; this results in a high likelihood that a substantial portion of primary containment leakage will be confined. 4. 10 CFR Part 50, Appendix J requires that structures of multiple barrier or subatmospheric containments (e.g., secondary containments for boiling water reactors and shield buildings for pressurized water reactors that enclose the entire primary reactor containment or portions thereof) be subject to individual tests in accordance with the procedures specified in the technical specifications, or associated bases. The function of the secondary containment is to minimize radioactive releases by confining a substantial fraction of primary containment leakage following a LOCA. The technical specifications establish conservative limits on the total fraction of primary containment leakage which may bypass secondary