Document: NUREG-0800
Document ID: a397b98f-e122-4d15-8471-5259fb45b58b
Document Type: srp
Title: and BTP 11-6 since the use of durable and passive design features would provide
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1305/ML13051A458.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.2
CFR Part: 
CFR Title: 

Content:
2014 such as tritium, C-14, Ni-63, Sr-90, Tc-99, I-129, and Cs-137, among others, and both parent and progeny radionuclides for radionuclides with decay chains. The radionuclide inventory for the tank and its components that are assumed to fail should be based on a conservative estimate of 80 percent capacity of that tank and its components. The selection of 80 percent assumes that some of the content of the failed tank would remain in the tank and room or cubicle where the tank is located, with the associated amounts of radioactive materials being retained in the building itself and, therefore, not available for environmental transport. Appendix A to this BTP presents a list of radionuclides which should be considered when defining source terms for surface water and groundwater release pathways. Depending on the type of scenario being considered in the radiological assessment, an applicant may exclude specific radionuclides, but must provide adequate justification to the staff for specific omissions. In those instances, the staff will review the basis of the justification for omitting specific radionuclides and evaluate the associated impacts on the results of the radiological assessment and confirm whether the applicant continues to meet the SRP acceptance criteria. The health physics staff will confirm that the selection of the type of radioactive materials and radionuclide distributions correspond to the highest expected concentrations and inventory of radioactivity in selected systems and components, and that the listed radionuclides are consistent with the plant design (see Appendix A), proposed release mechanism and exposure pathways at the point of entry into the nearest source of usable surface water or groundwater located in an unrestricted area. The health physics staff will use the resulting radionuclide concentrations in its analysis once the approach used in modeling the transport of radioactivity in surface water or groundwater and resulting