Reply to comment on the possible role of the reaction H+H2O→H2+OH in the radiolysis of water at high temperatures

Swiatla-Wojcik, Dorota; Buxton, George V.

doi:10.1016/j.radphyschem.2009.07.024

Cited by 26 publications

(19 citation statements)

References 14 publications

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“…At temperatures higher than the operating temperature, these free radicals are no longer found because they have reacted with other reactive species. The reaction rate contribute significantly at temperatures above 200 °C, however the value of the rate constant of this reaction remains unclear [17,18] .…”

Section: Resultsmentioning

confidence: 99%

Temperature Dependence of Primary Species G(values) Formed from Radiolysis of Water by Interaction of Tritium β-Particles

Butarbutar

Sriyono²,

Sunaryo³

2017

Jurnal Pengembangan Energi Nuklir

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TEMPERATURE DEPENDENCE OF PRIMARY SPECIES G(VALUES) FORMED FROM RADIOLYSIS OF WATER BY INTERACTION OF TRITIUM β-PARTICLES. G(values) are important to understand the effect of radiolysis of Nuclear Power Plant (NPP) cooling water. Since direct measurements are difficult, hence modeling and computer simulation were carried out to predict radiation chemistry in and around reactor core. G(values) are required to calculate the radiation chemistry. Monte Carlo simulations were used to calculate the G(values) of primary species , H•, H2, •OH dan H2O2 formed from the radiolysis of tritium β low energy electron. These radiolytic products can degrade the reactor components and cause corrosion under the reactor operating conditions. G(values) prediction can indirectly contribute to maintain the material reliability. G(values) were calculated at 10-8, 10-7, 10-6 and 10-5 s after ionization at temperature ranges. The calculation were compared with the G(values) of g-ray 60Co. The work aimed to understand temperature effect on the water radiolysis mechanism by the tritium β electron. The results show that the trend similarity was found on the temperature dependence of G(values) of tritium β electron and g-ray 60Co. For tritium β electron, G(values) for free radical were lower than g-ray 60Co, but higher for molecular products as temperature raise at 10-8 and 10-7. The significant differences for these two type of radiations were on G(H2), G(•OH) and G(H•) at 10-6and 10-5 s above 200 oC.

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Section: Resultsmentioning

confidence: 99%

Temperature Dependence of Primary Species G(values) Formed from Radiolysis of Water by Interaction of Tritium β-Particles

Butarbutar

Sriyono²,

Sunaryo³

2017

Jurnal Pengembangan Energi Nuklir

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“…Although H 2 is a molecular product, g(H 2 ) is observed to continue to increase with temperature, particularly above 200°C. This anomalous increase in g(H 2 ), which is an issue of much debate in the radiation chemistry of high-temperature water, has been discussed at length elsewhere [48][49][50][51][52][53][54][55]. From a theoretical perspective, we have recently performed Monte Carlo track chemistry simulations of the low-LET radiolysis of liquid water over the range 25-350°C [51], incorporating newly measured or re-assessed experimental data.…”

Section: Low-let Radiolysis Of Liquid Watermentioning

confidence: 96%

Generation of Ultrafast Transient Acid Spikes in High-Temperature Water Irradiated With Low Linear Energy Transfer Radiation

Kanike¹,

Meesungnoen²,

Sanguanmith³

et al. 2016

CNL Nuclear Review

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“…Thus, the concentration of O 2 increases as a function of the reverse reaction rate constant of reaction (33). The measurement of the precise rate constant of this reverse reaction, which has not yet been experimentally determined [26][27][28], could decrease the difference caused by employing different reaction sets and rate constants.…”

Section: Reactions and Corresponding Rate Constantsmentioning

confidence: 99%

“…Likewise, it is interesting to evaluate the reliability of several reaction sets and corresponding rate constants, as well as other initial parameters, for the simulation model at high temperatures. Unlike at ambient temperatures, the accumulated experimental data at elevated temperatures are not well established [25][26][27][28][29][30]. During the past few decades, several groups have attempted to evaluate the chemical reactions and corresponding rate constants based on the accumulated experimental hightemperature data together with the extrapolation and estimation of activation energies and theoretical evaluation [31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Primary yields and reaction sets with corresponding rate constants for computer simulation of water radiolysis at elevated temperature

Lertnaisat

Katsumura

Mukai³

et al. 2016

Journal of Nuclear Science and Technology

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The chemical conditions of coolant water in light water reactors are important factors affecting the corrosive environment and the integrity of the structural materials. Computer simulations have commonly been used to predict chemical environment changes due to water radiolysis under extreme conditions. Initial parameters, including the chemical reactions, rate constants, and primary yields of water decomposition by radiolysis, have been reported by several groups in the past few decades. Using a FACSIMILE simulation, the variations caused by utilizing different sets of primary yields of water radiolysis, including γ-rays and fast neutrons, along with the chemical reactions and rate constants at 285°C were evaluated in this study. The rate constant of the reverse reaction of OH + H 2 → H + H 2 O was found to be the main factor controlling the variation between the different sets of chemical reactions and rate constants.

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Reply to comment on the possible role of the reaction H+H2O→H2+OH in the radiolysis of water at high temperatures

Cited by 26 publications

References 14 publications

Temperature Dependence of Primary Species G(values) Formed from Radiolysis of Water by Interaction of Tritium β-Particles

Temperature Dependence of Primary Species G(values) Formed from Radiolysis of Water by Interaction of Tritium β-Particles

Generation of Ultrafast Transient Acid Spikes in High-Temperature Water Irradiated With Low Linear Energy Transfer Radiation

Primary yields and reaction sets with corresponding rate constants for computer simulation of water radiolysis at elevated temperature

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