Mathematical modeling of radiolysis of mixtures of hydrogen, nitrogen, oxygen and their compounds in the gas phase

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Abstract

A mathematical model of radiation-induced transformations in vapor-gas mixtures containing hydrogen, nitrogen, oxygen and their compounds is presented. In accordance with the array of experimental data used in verification, the model adequately describes the directions and rates of processes in the temperature range from 0 to ~250°C, pressure from 1 kPa to 0.2 MPa (in some cases up to ~5 MPa) and absorbed dose rate up to 103–104 Gy/s over an unlimited time interval. The model can be used as a tool for performing fast calculations with wide sets of external parameters and initial conditions: when assessing the consequences of design and beyond design basis accidents at reactor facilities with water coolants, as well as when substantiating hydrogen explosion safety at facilities where there are sources of ionizing radiation.

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About the authors

A. B. Sazonov

National Research Center “Kurchatov Institute”

Email: Grachev_VA@nrcki.ru
Russian Federation, Moscow

V. A. Grachev

National Research Center “Kurchatov Institute”

Author for correspondence.
Email: Grachev_VA@nrcki.ru
Russian Federation, Moscow

O. S. Bystrova

National Research Center “Kurchatov Institute”

Email: Grachev_VA@nrcki.ru
Russian Federation, Moscow

A. V. Frolova

National Research Center “Kurchatov Institute”

Email: Grachev_VA@nrcki.ru
Russian Federation, Moscow

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2. Fig. 1. Composition of the gas mixture during NO irradiation (70 °C, 66.7 kPa, 105 Gy/min): 1 – NO, 2 – NO2, 3 – N2, 4 – N2O, 5 – O2.

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3. Fig. 2. Composition of the gas mixture during NO2 irradiation (70 °C, 73.3 kPa, 1.2 × 105 Gy/min): 1 – NO2, 2 – N2, 3 – N2O, 4 – O2, 5 – NO.

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4. Fig. 3. Accumulation of ammonia and destruction of intermediate radiolysis products during irradiation of a nitrogen-hydrogen mixture containing O2: 1 – NH3, 2 – NO (× 10), 3 – NO2, 4 – N2O.

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5. Fig. 4. Oxygen consumption and formation of oxidation products during irradiation of a nitrogen-hydrogen mixture containing O2: 1 – O2 (× 2), 2 – HNO3 (× 3), 3 – H2O.

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6. Fig. 5. The main products of radiolysis of dry air (20°C, 101.3 kPa, 1 Gy/s) containing hydrogen (1 kPa): 1 – NO2, 2 – O3, 3 – N2O, 4 – HNO3.

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7. Fig. 6. The main products of radiolysis of air (20°C, 101.3 kPa, 1 Gy/s) containing hydrogen (1 kPa) and water vapor (2.3 kPa): 1 – NO2, 2 – O3, 3 – N2O, 4 – HNO3.

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