Document: NUREG-0800
Document ID: bc3e4db6-5bf3-4ccc-95dd-955e48799612
Document Type: srp
Title: CONTAINMENT LEAKAGE TESTING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070620007.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.6
CFR Part: 
CFR Title: 

Content:
In addition, it is typical for BWR applicants or licensees to request that MSIV local leakage rates be excluded from the Type A test leakage rate and the sum of Type B and Type C leakage rates, which would require exemption from Option A, Sections III.A., III.B.3., and III.C.3, or Option B, Sections III.A. and III.B. Such exemptions must also be requested and justified, and may readily be combined with an exemption request regarding test pressure and acceptance criteria, mentioned above. NEI 94-01, Rev. 0 (Section 6.0), and ANSI/ANS-56.8-1994 (Section 3.3.1) state that Type B or Type C tests are not required for the following cases: 1. Containment boundaries that do not constitute potential containment atmospheric leakage pathways during and following a design-basis loss-of-coolant accident (DB LOCA); 2. Containment boundaries sealed with a qualified seal system; 6.2.6-6 Revision 3 - March 2007 3. Test connections, vents, and drains between containment isolation valves which: A. are one inch or less in size, and B. administratively secured closed, and C. consist of a double barrier (e.g., two valves in series, one valve with a nipple and cap, one valve and a blind flange). This guidance may be applied to either Option A or Option B of Appendix J. Examples of Case No. 1 are lines that terminate below the minimum post-accident water level of the suppression pool in a BWR or the recirculation sump in a PWR. For Case No. 2, a qualified seal system is defined in ANSI/ANS-56.8-1994 as a system that is capable of sealing the leakage with a liquid at a pressure no less than 1.1 Pa, for at least 30 days following the DB LOCA. The staff's position is that the analysis of the sealing capability includes the assumption of the most limiting single failure of any active component. Also, unless there is a virtually unlimited supply of sealing liquid (such as from a suppression pool or recirculation sump), limits for liquid leakage rate should be assigned to these valves based on