A system (300) configured to passively filter radioactive materials from a flow (302) may include one or more particulate removal devices (310); one or more water removal devices (316); and/or one or more radionuclide removal devices (322). At least one of the one or more particulate removal devices may mechanically remove particulates of the radioactive materials from the flow. At least one of the one or more water removal devices mechanically may remove water from the flow. At least one of the one or more radionuclide removal devices may remove radioactive aerosols, reactive radioactive gases, or radioactive aerosols and reactive radioactive gases from the flow using engineered filter media (522). A filter (500) may include a body (502), including an inlet (504) and an outlet (510). The body may be configured to store filter media (522), to contain pressure from gas explosions, and/or to allow the stored filter media to move toward the outlet when pressure at the inlet increases.
