Kinetics and mechanism of thermoradiation decomposition of water vapour and its mixtures with acceptors

Development and verification of a mathematical model of the radiolysis of water vapor

“…Hydrogen yield versus temperature for irradiation of water for 1.5 sec by a beam of accelerated electrons from the U-12 accelerator with dose rates 590 (A), 1640 (×), 3900 (a), and 13680 Gy/sec (C)[11]: ---) calculation.…”

“…Analysis of the data obtained in investigations of the water chemistry of operating power and research nuclear reactors [5][6][7][8] has shown that their use for verifying software is problematic and at present impossible because they do not provide important data, such as the dose rate of the n and γ radiation absorbed in the coolant, the temperature distribution over the first loop, and the parameters of the thermal-and hydrodynamic regime at the moment the experiments or observations were performed. Consequently, only data obtained in laboratory investigations were found to be suitable for purposes of verification [1, [9][10][11].…”

“…Aside from the reaction rate constants, the table also presents the temperature interval ∆T in which they were determined experimentally and also the variance ∆logk 0 . The optimized constants k OH+OH and k H+H 2 O were determined by comparing the computed dose and temperature dependences of the observed yield of molecular hydrogen with the experimental data presented in [1, [9][10][11]. The rate constant k OH+OH = 1.44·10 12 dm 6 /(mole 2 ·sec) [4] is temperature independent in the interval 300-400 K. Our calculations showed that the experimental temperature dependences of G H 2 can be described in a wider temperature range only if it is assumed that the rate constant of the reaction OH + OH + H 2 O = H 2 O 2 + H 2 O has a T −2 temperature dependence by analogy with the reaction H + OH +H 2 O = H 2 O +H 2 O.…”