Document: NUREG-0800
Document ID: 55688d47-80f6-498a-af38-5bfb9d7420aa
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070740004.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
lear Regulatory Commission, Washington, DC 20555, Attention: Reproduction and Distribution Services Section, or by fax to (301) 415-2289; or by email to DISTRIBUTION@nrc.gov. Electronic copies of this section are available through the NRC's public Web site at http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0800/, or in the NRC's Agencywide Documents Access and Management System (ADAMS), at http://www.nrc.gov/reading-rm/adams.html, under Accession # ML070740004. NUREG-0800 U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN BRANCH TECHNICAL POSITION 6-3 DETERMINATION OF BYPASS LEAKAGE PATHS IN DUAL CONTAINMENT PLANTS REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of component integrity issues related to engineered safety features Secondary - None A. BACKGROUND This branch position provides guidance in the determination of that portion of the primary containment leakage not collected and processed by the secondary containment. Bypass leakage is defined as leakage from the primary containment which can circumvent the secondary containment boundary and escape directly to the environment (i.e., bypass the leakage collection and filtration systems of the secondary containment). This leakage component must be considered in the radiological analysis of a loss-of-coolant accident (LOCA). The secondary containment consists of a structure which completely encloses the primary containment and can be maintained at a pressure lower than atmospheric so that primary containment leakage can be collected or processed before release to the environment. The secondary containment may include an enclosure building forming an annular volume around the primary containment, the auxiliary building where it completely encloses the primary BTP 6-3-2 Revision 3 - March 2007 containment, and other regions of the plant with leakage collection and filtration systems. Depressurization systems as parts of the secondary containment decrease or maintain the