Document: NUREG-0800
Document ID: ceaa1dba-52a6-4b19-ad13-28c6d44794a8
Document Type: srp
Title: POSTULATED RADIOACTIVE RELEASES DUE TO LIQUID-CONTAINING TANK FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350171.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.7.3
CFR Part: 
CFR Title: 

Content:
ect the tanks and components for which a failure is assumed based on the nuclide concentration and the total radioactive material content in the tank and its components that will result in the highest concentrations of radioactive material at the nearest potable water supply in an unrestricted area. a. The radionuclide inventory in failed components is based on assuming 80% of the liquid volume in each component and the expected failed fuel fraction, i.e., 0:12% of the fuel producing power in a pres- surized water reactor (PWR) per NUREG-0017 or consistent with an offgas release rate of 15 pCi/sec-MWt after 30 minutes delay for a boiling water reactor (BWR) per NUREG-0016. The radionuclide inventory in failed components is calculated based on the techniques given in Chapter 4 and Appendices A and B of NUREG-0133. b. The ETSB will consider the design features, e.g., steel liners or walls in building areas housing components, dikes for outdoor tanks, and overflow provisions incorporated to mitigate the effect of a | postulated failure. Because of the potential radionuclide inven- tory, the failed components that are considered are typically waste collector tanks or evaporator concentrate tanks. However, the components selected for evaluation are based on the individual plant design. Selection of the components should be coordinated with the HGEB reviewer to assure that the assessment considers access to the hydrosphere and the magnitude of potential dilution and decay for various pathways as well as size and inventory. Credit for liquid retention by unlined building foundations will not be given regardless of the building seismic category because of the *"Supply" means a well or surface water intake that is used as a water source for direct human consumption or indirectly through animals, crops, or food processing. 15. 7. 3-2 Rev. 2 - July 1981 potential for cracks. Credit is not allowed for retention by coatings or leakage barriers outside the building foundation. 2.