Abstract: A system of extracting fluid samples, either liquid or gas, from the interior of a nuclear reactor containment utilizes a jet pump. To extract the sample fluid, a nonradioactive motive fluid is forced through the inlet and discharge ports of a jet pump located outside the containment, creating a suction that draws the sample fluid from the containment through a sample conduit connected to the pump suction port. The mixture of motive fluid and sample fluid is discharged through a return conduit to the interior of the containment. The jet pump and means for removing a portion of the sample fluid from the sample conduit can be located in a shielded sample grab station located next to the containment. A non-nuclear grade active pump can be located outside the grab sampling station and the containment to pump the nonradioactive motive fluid through the jet pump.

Abstract: A method and apparatus for use in conjunction with a passive nuclear reactor containment cooling system to significantly reduce the release of radiation and resulting off-site doses is disclosed. Gases that may contain radioactive materials are drawn from a penetration room and pass through a filter prior to being fed into the passive containment airflow path. Low pressure areas are created in the passive containment airflow path by means of eductor/airfoils. Such low pressure zones draw the gases from the penetration rooms.