[en] This document provides supporting calculations for the preparation of the Submerged Bed Scrubber Condensate Disposal Preconceptual Study report. The supporting calculations include equipment sizing, Hazard Category determination, and LAW Melter Decontamination Factor Adjustments

[en] Operation of the ITER machine with tritium plasma requires tritium confinement systems to protect workers and the environment. Tritium confinement at ITER is based on multistage approach. The final stage provides tritium confinement in building sectors and consists of building's walls as physical barriers and control of sub-atmospheric pressure in those volumes as a dynamic barrier. The dynamic part of the confinement function shall be provided by safety important components that are available all the time when required. Detritiation of air prior to its release to the environment is based on catalytic conversion of tritium containing gaseous species to water vapour followed by their isotopic exchange with liquid water in scrubber column of packed bed type. Wet scrubber technology has been selected because of its advantages over conventional air detritiation technique based on gas drying by water adsorption. The most important design target of system availability was very difficult to meet with conventional water adsorption driers. This paper presents results of experimental trial for validation of wet scrubber technology application in the ITER tritium confinement system and process evaluation using developed simulation computer code.

[en] Venturi scrubbers are widely utilized in gas cleaning. The cleansing elements in these scrubbers are droplets formed from the atomization of a liquid into a dust-laden gas. In industrial scrubbers, this liquid is injected through several orifices so that the cloud of droplets can be evenly distributed throughout the duct. The interaction between droplets when injected through many orifices, where opposite clouds of atomized liquid can reach each other, is to be expected. This work presents experimental measurements of droplet size measured in situ and the evidence of cloud interaction within a Venturi scrubber operating with multi-orifice jet injection. The influence of gas velocity, liquid flow rate and droplet size variation in the axial position after the point of the injection of the liquid were also evaluated for the different injection configurations. The experimental results showed that an increase in the liquid flow rate generated greater interaction between jets. The number of orifices had a significant influence on droplet size. In general, the increase in the velocity of the liquid jet and in the gas velocity favored the atomization process by reducing the size of the droplets

[en] This report presents the results of a study of the removal of iodomethane from air using a pilot-scale corona discharge scrubber. The removal was measured in the following parameter ranges: bulk air flow, 30 to 350 m³/h; initial CH₃I concentration, 6 to 230 μmol/m³; and discharge current, 0 to 75 mA DC (negative polarity). Approximately five to ten moles of iodomethane are removed per mole of electrons added to the air stream at a discharge voltage of ∼ 10 kV. This removal efficiency suggests that both ion-molecule and radical-molecule reactions may be important in the removal of iodomethane from air in a corona discharge. The results of this pilot-scale demonstration indicate that a corona discharge scrubber would be suitable for removing iodine species from air as part of the emergency filtered-air discharge system of a nuclear reactor. The application of this technology to the control of nitrogen oxide, sulfur dioxide and hydrogen sulfide emissions is being investigated. 15 refs

[en] A structure design program was developed for Venturi scrubber working at the self-priming mode. This program proposed a complete logic for thermal parameters calculation and structure design of the throat. A revised calculation for resistance relationship was carried out based on experimental study. The relative error between revised results and experimental values is within 8.6%. (authors)

[en] The Filtra-MVSS for filtered venting of containment overpressure is a flexible system capable of covering a wide range of hypothetical design basis events for BWRs and PWRs. The system encompasses a number of special features, can be optimized for a specified decontamination factor, and can accommodate a wide range of off-gas flow rates. (author)

[en] Unit models and corresponding flow streams have been developed for the stoichiometric Bunsen reaction with chemical process simulator. These unit models and flow streams have been integrated to develop overall simulated flow-sheet for Bunsen reaction. The overall flow-sheet for Bunsen reaction can be modified when more accurate and reliable thermodynamic data are produced in the future

[en] Operation of a submerged bed scrubber has been characterized well enough to accurately estimate the collection efficiency for aerosols in an off-gas treatment system. The device has the advantages of a high degree of reliability and minimal control requirements. Correlations have been developed that allow direct specification of the design variables that are required to achieve a desire collection efficiency. The decontamination factors achievable through proper design and efficient operation are well within the acceptable range for a primary scrubber in nuclear off-gas treatment systems

[en] Short communication

[en] The device is claimed for patent consisting of a combustion chamber, scrubber and sedimentation tank. The device is designed so as to provide protection for personnel from ionizing radiation and radioactive aerosols. In processing metal uranium chips in this device controlled oxidation takes place without the development of nitroso gases. The advantage of the system of the manufacture of uranium triuranium octaoxide is higher productivity and lower energy demand of the process. The product may directly be used for colouring glass batches and ceramic glazes. (E.S.). 4 figs