Computer Simulation of Thermal Processes Involving Sr and Ca Radionuclides in the Process of Heating Radioactive Graphite in an Air Atmosphere

Q4 Energy Izvestiya Wysshikh Uchebnykh Zawedeniy, Yadernaya Energetika Pub Date : 2023-09-01 DOI:10.26583/npe.2023.3.09

Nikolay M. Barbin, S. Titov, Dmitry I. Terentiev, A. Kobelev

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Abstract

The paper presents the results from a thermodynamic analysis of the behavior of Sr and Ca radionuclides in the process of heating radioactive graphite in an air atmosphere. The TERRA software package was used for the thermodynamic analysis in a temperature range of 300 to 3600 K to determine the possible composition of the ionized, gaseous and condensed phases. It has been found that strontium is in the form of condensed SrCl2(c) and gaseous SrCl2 in a temperature range of 300 to 1600 K, and in the form of gaseous SrCl2, SrO, SrCl and Sr and ionized SrCl+, Sr+ and SrO+ when the temperature is increased from 1600 to 3600 K. Calcium is in the form of condensed CaCl2(c), CaUO4(c), CaO(c) and gaseous CaCl2 in the temperature interval between 300 and 2100 K, and in the form of gaseous Ca, CaCl and CaO and ionized Ca+, CaO+ and CaCl+ when the temperature is increased from 2100 to 3600 K. The paper determines the key reactions within individual phases and among condensed, gaseous and ionized phases. The equilibrium constants of their reactions have been calculated. Based on the results obtained, dependence plots are presented for the Sr and Ca radionuclide distribution by phases.

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在空气大气中加热放射性石墨过程中涉及 Sr 和 Ca 放射性核素的热过程计算机模拟

本文介绍了在空气环境中加热放射性石墨过程中 Sr 和 Ca 放射性核素行为的热力学分析结果。热力学分析使用了 TERRA 软件包，温度范围为 300 至 3600 K，以确定电离相、气相和凝聚相的可能组成。研究发现，在 300 至 1600 K 的温度范围内，锶以冷凝态 SrCl2(c) 和气态 SrCl2 的形式存在；当温度从 1600 K 升至 3600 K 时，锶以气态 SrCl2、SrO、SrCl 和 Sr 以及电离态 SrCl+、Sr+ 和 SrO+ 的形式存在。在 300 至 2100 K 的温度区间内，钙以凝结 CaCl2(c)、CaUO4(c)、CaO(c) 和气态 CaCl2 的形式存在；当温度从 2100 K 升至 3600 K 时，钙以气态 Ca、CaCl 和 CaO 以及离子化 Ca+、CaO+ 和 CaCl+ 的形式存在。计算了它们反应的平衡常数。根据所获得的结果，给出了各相 Sr 和 Ca 放射性核素分布的依存图。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Izvestiya Wysshikh Uchebnykh Zawedeniy, Yadernaya Energetika Energy-Nuclear Energy and Engineering

CiteScore

0.40

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0.00%

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