Analysis of the Causes of Irregular 36Cl Radionuclide Distribution in Irradiated Nuclear Graphite

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

Research output: Contribution to journalArticle

Abstract

Abstract—: The article is dedicated to analyzing the concentration processes of the long-lived 36Cl radionuclide in irradiated graphite of uranium-graphite nuclear reactors. The 36Cl radionuclide is one of the most important isotopes for assessing the safety of radioactive-waste disposal. An analysis of the so-called Nugget effect due to the substantial heterogeneity of the 36Cl content in samples of irradiated graphite of nuclear reactors is carried out. In the same graphite elements, the difference in the 36Cl concentration reaches 100 times regardless of operational factors, such as the neutron flux and temperature. The article discusses the main processes that can affect 36Cl contamination in irradiated graphite. Particular attention is paid to determining the form of 36Cl in graphite, taking into account the features of its manufacturing and thermodynamic modeling of the equilibrium compositions of reaction products during the purification of unirradiated graphite in a gaseous medium.

Original languageEnglish
Pages (from-to)176-183
Number of pages8
JournalJournal of Surface Investigation
Volume14
Issue number1
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • chlorine
  • decommissioning
  • irradiated graphite
  • irregularity
  • leaching
  • Nugget effect
  • radionuclide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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