Thermophysics and Aeromechanics

, Volume 25, Issue 1, pp 109–117 | Cite as

Study of evaporating the irradiated graphite in equilibrium low-temperature plasma

  • E. V. Bespala
  • I. Yu. Novoselov
  • A. O. Pavlyuk
  • S. G. Kotlyarevskiy
Article
  • 1 Downloads

Abstract

The paper describes a problem of accumulation of irradiated graphite due to operation of uranium-graphite nuclear reactors. The main noncarbon contaminants that contribute to the overall activity of graphite elements are iso-topes 137Cs, 60Co, 90Sr, 36Cl, and 3H. A method was developed for processing of irradiated graphite ensuring the volu-metric decontamination of samples. The calculation results are presented for equilibrium composition of plasma-chemical reactions in systems “irradiated graphite−argon” and “irradiated graphite−helium” for a wide range of tem-peratures. The paper describes a developed mathematical model for the process of purification of a porous graphite surface treated by equilibrium low-temperature plasma. The simulation results are presented for the rate of sublimation of radioactive contaminants as a function of plasma temperature and plasma flow velocity when different plasma-forming gases are used. The extraction coefficient for the contaminant 137Cs from the outer side of graphite pores was calculated. The calculations demonstrated the advantages of using a lighter plasma forming gas, i.e., helium.

Keywords

irradiated graphite plasma processing decontamination 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • E. V. Bespala
    • 1
  • I. Yu. Novoselov
    • 2
  • A. O. Pavlyuk
    • 1
  • S. G. Kotlyarevskiy
    • 1
  1. 1.Pilot and Demonstration Center for Decommissioning of Uranium-Graphite Nuclear Reactors (PDC UGR)SeverskRussia
  2. 2.Tomsk Polytechnic UniversityTomskRussia

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