Modelling of radiolysis of reactor cooling water—A comparative study

Lukac, Sava

doi:10.1016/1359-0197(89)90143-4

Cited by 3 publications

(4 citation statements)

References 14 publications

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“…However, as the temperature increases, the g(H) difference becomes apparent and, as a consequence of this, g(H202) (eq. [21]) also differs. solutions do appear to have a lower temperature dependence than in near-neutral solutions.…”

Section: (D) G-values For the Primary Species As Function Of Temperaturementioning

confidence: 96%

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g-Values for γ-irradiated water as a function of temperature

Elliot¹,

Chenier²,

Ouellette³

1990

Can. J. Chem.

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The g-values of primary species formed in the γ-radiolysis of water have been estimated for the temperature range 25–300 °C. The g-values for the hydrated electron, the hydroxyl radical, and molecular hydrogen all increase approximately 50% over this temperature range. The g-values for the minor products, hydrogen peroxide and atomic hydrogen, probably also increase with temperature; however, there is evidence from some of the experimental data which suggests that these g-values may slightly decrease with increasing temperature. Keywords: radiolysis, g-values, temperature dependence.

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Section: (D) G-values For the Primary Species As Function Of Temperaturementioning

confidence: 96%

“…For both figures, the g-values for hydrogen peroxide were calculated using the mass balance eq. [21]:…”

Section: (D) G-values For the Primary Species As Function Of Temperaturementioning

confidence: 99%

g-Values for γ-irradiated water as a function of temperature

Elliot¹,

Chenier²,

Ouellette³

1990

Can. J. Chem.

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“…After the description of the sub - and super -Arrhenius cases in the limit d → 0 at large β, we turn now to consider the limiting behavior as β → 0, namely at high temperature. In most cases, the generic behavior is considered to be the tendency to the Arrhenius as a limit: situations may occur where this assumption has been relaxed [important examples are protein folding (Chan and Dill, 1998; Wallace et al, 2002) and reactions in sub- or super-critical solvent (Christensen and Sehested, 1983; Lukac, 1989; Marin et al, 2003)]. We can take advantage of the following useful expansion (Abe and Okamoto, 2008; Tsallis, 2009):…”

Section: Transitivity Definedmentioning

confidence: 99%

Temperature Dependence of Rate Processes Beyond Arrhenius and Eyring: Activation and Transitivity

2019

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Advances in the understanding of the dependence of reaction rates from temperature, as motivated from progress in experiments and theoretical tools (e. g., molecular dynamics), are needed for the modeling of extreme environmental conditions (e.g., in astrochemistry and in the chemistry of plasmas). While investigating statistical mechanics perspectives (Aquilanti et al., 2017b , 2018 ), the concept of transitivity was introduced as a measure for the propensity for a reaction to occur. The Transitivity plot is here defined as the reciprocal of the apparent activation energy vs. reciprocal absolute temperature. Since the transitivity function regulates transit in physicochemical transformations, not necessarily involving reference to transition-state hypothesis of Eyring, an extended version is here proposed to cope with general types of transformations. The transitivity plot permits a representation where deviations from Arrhenius behavior are given a geometrical meaning and make explicit a positive or negative linear dependence of transitivity for sub - and super -Arrhenius cases, respectively. To first-order in reciprocal temperature, the transitivity function models deviations from linearity in Arrhenius plots as originally proposed by Aquilanti and Mundim: when deviations are increasingly larger, other phenomenological formulas, such as Vogel-Fulcher-Tammann, Nakamura-Takayanagi-Sato, and Aquilanti-Sanches-Coutinho-Carvalho are here rediscussed from the transitivity concept perspective and with in a general context. Emphasized is the interest of introducing into this context modifications to a very successful tool of theoretical kinetics, Eyring's Transition-State Theory: considering the behavior of the transitivity function at low temperatures, in order to describe deviation from Arrhenius behavior under the quantum tunneling regime, a “ d -TST” formulation was previously introduced (Carvalho-Silva et al., 2017 ). In this paper, a special attention is dedicated to a derivation of the temperature dependence of viscosity, making explicit reference to feature of the transitivity function, which in this case generally exhibits a super -Arrhenius behavior. This is of relevance also for advantages of using the transitivity function for diffusion-controlled phenomena.

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“…, OH -, and H + . [1][2][3][4][5][6] The lifetime of many of these species is short, on the order of microseconds or less. While short-lived water radiolysis products may be an important consideration in the corrosion mechanism of materials exposed directly to ionizing radiation (as the short-lived species will be formed at the metal/solution/radiation interface), they will have little impact on materials downstream from the radiation source in a cooling water loop.…”

Section: Radiation and Radiolysis Effects On Corrosionmentioning

confidence: 99%