Document: NUREG-0800
Document ID: 6c5a07e2-91cf-49ae-a450-62551ed6bcef
Document Type: srp
Title: CONTAINMENT ISOLATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340703.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.4
CFR Part: 
CFR Title: 

Content:
r Criterion 4, "Environmental Criterion 16, "Containment Criterion 54, "Piping Systems 6.2.4-11 Rev. 2 - July 1981 6. 10 CFR Part 50, Appendix A, General Design Criterion 55, "Reactor Coolant Pressure Boundary Penetrating Containment." 7. 10 CFR Part 50, Appendix A, General Design Criterion 56, "Primary Contain- ment Isolation." 8. 10 CFR Part 50, Appendix A, General Design Criterion 57, "Closed System Isolation Valves.' 9. Regulatory Guide 1.11, "Instrument Lines Penetrating Primary Reactor Con- tainment." 10. Regulatory Guide 1.26, "Quality Group Classifications and Standards for Water-, Steam-, and Radioactive-Waste-Containing Components of Nuclear Power Plants." 11. Regulatory Guide 1.29, "Seismic Design Classification." 12. Regulatory Guide 1.141, "Containment Isolation Provisions for Fluid Systems." 13. Branch Technical Position CSB 6-4, "Containment Purging During Normal Plant Operation," attached to this SRP section. 14. 10 CFR Part 100, "Reactor Site Criteria." 15. 10 CFR Part 50, Appendix K, "ECCS Evaluation Models." 16. NUREG-0737, "Classifications of TMI Action Plan Requirements." 17. NUREG-0718, "Licensing Requirements for Pending Application for Construc- tion Permits and Manufacturing License." 6.2.4-12 Rev. 2 - July 1981 Branch Technical Position CSB 6-4 CONTAINMENT PURGING DURING NORMAL PLANT OPERATIONS A. BACKGROUND This branch technical position pertains to system lines which can provide an open path from the containment to the environs during normal plant operation; e.g., the lines associated with the containment purge and vent systems. It supplements the position taken in SRP Section 6.2.4. While the containment purge and vent systems provide plant operational flexibility, their designs must consider the importance of minimizing the release of containment atmosphere to the environs following a postulated loss-of-coolant accident. Therefore, plant designs must not rely on their use on a routine basis. The need for purging has not always been