Document: NUREG-0800
Document ID: c0c5657a-82df-46c2-8cb5-fad0fd37fb58
Document Type: srp
Title: GASEOUS WASTE MANAGEMENT SYSTEMS1
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070610.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.3
CFR Part: 
CFR Title: 

Content:
tems designed to acceptance criteria of SRP Section 11.3 have low probability of passive failure, excluding events required by the guidelines of 10 CFR Part 100. All principal release points are to be monitored and controlled according to the requirements of 10 CFR Part 50, Appendix A, GDC 60 and 64, and SRP Section 11.5 provides the acceptance criteria for release point instrumentation to assure that setpoints are established on gaseous effluent lines prior to exceeding the limits of 10 CFR Part 20.99 Therefore, the most credible unique unplanned release would be a major leak or a single active failure of a waste gas system component releasing gas by a The NRC staff considers that the release to the environment resulting from the postulated event will be via a pathway not normally used for planned releases and requiring the release will 11.3-19 DRAFT Rev. 3 - April 1996 require a reasonable time to detect and take remedial action to terminate the release. The NRC staff considers that the release of a compressed gas storage tank of a batch-type waste gas system or the inadvertent bypass of the main decay portion of a continuous-type waste gas system (such as charcoal delay beds in a BWR augmented off-gas system) would provide a conservative assumption for any unique unplanned the release while the input to the waste gas system is at the system design basis source term. Only the radioactive noble gases (Xe, Kr, Ar) are to be considered since the assumed transit time is great enough to permit major radioactive decay of oxygen and nitrogen isotopes. Particulates and radioiodines are assumed to be removed by pretreatment, gas separation, and intermediate radwaste treatment equipment. The release should be assumed to occur within the building structure housing the waste gas system storage tank or main decay position of the system., and It should further be assumed that the effluent resulting from the postulated event will be released to the environs without continuous