Abstract: A gas purifier having a removeable sample canister apparatus and gas adsorber in combination is provided for use in atmospheric containment and cleanup systems in nuclear power plants and other air and gas filtering applications. The sample canister is particularly adapted for removeable attachment to and use in combination with a gas adsorber having a plurality of parallel spaced filter beds. The sample canister is designed to permit the sampling of adsorbent material at discrete time intervals without disturbing adsorbent material in the filter beds and without disturbing the structural integrity of the gas adsorber to which the sample canister is attached.

Abstract: Methods for removing radioactive isotopes from contaminated gas streams for use in atmospheric containment and cleanup systems in nuclear power plants are provided. The methods provide for removal of radioactive isotopes from a first portion of the contaminated stream, separated from the remaining portion of the stream, so that adsorbent used to purify the first portion of the contaminated stream by adsorption of the radioactive isotopes therefrom can be tested to determine the adsorbing efficacy of the generally larger portion of adsorbent used to purify the remaining portion of the stream.

Abstract: A closure apparatus is provided for optionally closing and opening a storage hopper portion of an adsorber filter fill system used for filling adsorber filter cells in a gas adsorber filter system. The closure apparatus is particularly adapted to have a portion thereof move with respect to a metering means of storage hopper of an adsorber filter fill system between first or open and second or closed positions, so as to optionally, selectably permit the opening and closing of the storage hopper. The closure apparatus provides a substantially air-tight seal at holes in the metering means of the adsorber filter fill system when the closure apparatus is at the closed position. The closure apparatus is designed so that its sliding operation and maintenance of substantially air-tight seals is not adversely affected by the presence of any granules of adsorbent which remain in the holes in the metering means or in the vicinity of the holes in the metering means once filling of the adsorber filter system is completed.

Abstract: Standby gas treatment system for removal of radioactive release from a nuclear containment structure not only during normal purge operations but also in the event of a design basis accident. Ventiduct trains arranged in parallel so that one is redundant are each operative to extract dust in excess of 0.3 microns and adsorb radioactive iodine and compounds thereof at 99.9% plus efficiency. A rechargeable gasketless charcoal filter in each train can be filled or emptied without removing the filter enclosures per se. Laminar flow filter beds entirely encapsulate the gas stream to provide low gas velocity and even distribution across the charcoal cage without channeling, thereby securing long residence time.

Abstract: System includes a closed housing having a plurality of rectangularly configured beds with perforate sidewalls longitudinally disposed in housing in laterally spaced disposition with each other. Alternate spaces at inlet end are closed and alternate spaces opposite the open ends are closed at exit end whereby contaminated gas is laterally squeezed through the beds filled with particulate adsorbent. The lower portions of the beds funnel into longitudinally extending discharge chutes enclosed within respective wells, the lower edges of the chutes rising at a constant angle above the well floor. An evacuation system coupled to the wells suctions the pile of particulate from the most remote portion of the chutes first.