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

E. V. Bespala, I. Yu Novoselov, A. O. Pavlyuk, S. G. Kotlyarevskiy

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)109-117
Number of pages9
JournalThermophysics and Aeromechanics
Volume25
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Fingerprint

cold plasmas
graphite
contaminants
radioactive contaminants
decontamination
nuclear reactors
plasma temperature
magnetohydrodynamic flow
sublimation
gases
purification
uranium
mathematical models
chemical reactions
flow velocity
helium
porosity
coefficients
simulation

Keywords

  • decontamination
  • irradiated graphite
  • plasma
  • processing

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics

Cite this

Study of evaporating the irradiated graphite in equilibrium low-temperature plasma. / Bespala, E. V.; Novoselov, I. Yu; Pavlyuk, A. O.; Kotlyarevskiy, S. G.

In: Thermophysics and Aeromechanics, Vol. 25, No. 1, 01.01.2018, p. 109-117.

Research output: Contribution to journalArticle

Bespala, E. V. ; Novoselov, I. Yu ; Pavlyuk, A. O. ; Kotlyarevskiy, S. G. / Study of evaporating the irradiated graphite in equilibrium low-temperature plasma. In: Thermophysics and Aeromechanics. 2018 ; Vol. 25, No. 1. pp. 109-117.
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