Characterisation of RBMK-1500 graphite: A method to identify the neutron activation and surface contamination terms

Remeikis, Vidmantas; Plukienė, R.; Plukis, A.; Barkauskas, Vytenis; Gudelis, A.; Druteikienė, R.; Gvozdaitė, R.; Juodis, L.; Duškesas, G.; Lagzdina, Elena; Germanas, Darius; Ridikas, D.; Krutovcov, Sergej

doi:10.1016/j.nucengdes.2019.110501

Cited by 6 publications

(1 citation statement)

References 26 publications

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“…The radioactive graphite waste produced has been stored temporarily at the decommissioning sites, waiting for development of a reliable and safe decontamination technology for final disposal [1][2][3][4][5]. The radioactivity of graphite waste originates from the active radionuclides produced from the nuclear fission reaction and the irradiation of impurities adsorbed on the pore surfaces of the pure graphite matrix [1, [6][7][8][9][10]. Theoretically, most of the metallic radionuclides can be selectively removed using the halogenation process.…”

Section: Introductionmentioning

confidence: 99%

Single-Phase Flow Model of a Screw Reactor for Decontamination of Radioactive Graphite Waste Using Surface Gasification

Yang

2022

Processes

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A screw reactor is a promising apparatus for decontaminating radioactive graphite waste by uniform gasification under ambient air. However, developing the design equation for a screw reactor is difficult due to the reactor’s fundamentally intricate gas and solid interactions. In this study, we performed three-dimensional computational fluid dynamics simulations to predict and characterize the graphite particles that flow through the screw reactor and are thermally gasified. This was done using the Eulerian single-fluid approach coupled with the experimentally established kinetic model for graphite gasification. The numerical results show that the counter-rotating flow, generated along the rotating screw of the reactor by the relative motion of the reactor wall to the rotating screw, mixes particles spatially and reduces their axial velocity. The diameter of the feed graphite particles can be reduced by as much as 28% depending on the screw rotating velocity and the temperature of the reactor shell, according to the conducted numerical calculations. These numerical simulations can be used to provide proper operating parameters for the laboratory-scale screw reactor by which to decontaminate radioactive graphite waste by gasifying the radiocarbons, together with a part of the graphite matrix, on the surface of the graphite particles.

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