Publication: Solubility Equations of Boron Compounds under Coolant Conditions in VVER-Type Reactor Plants
Дата
2021
Авторы
Kharitonova, N. L.
Gurbanova, S. A.
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Аннотация
In carrying out quantitative safety assessment at nuclear power plants equipped with pressurized water reactors (the Russian version of which is known as VVER-type reactors), for estimating the risk of boron compound crystallization both in the reactor core and in the spent fuel pool under various emergency conditions of operation, it is necessary to have data on the solubility of these compounds with estimated data accuracy indicators. The article considers the boric acid compounds the data on the solubility of which are of interest in estimating the potential risks of their crystallization with the purpose of retaining the core cooling function during accidents. The forms in which the solid phases of borates exist in the H3BO3/HBO2/B2O3 + H2O and LiBO2 + H2O systems at elevated temperatures are estimated. Experimental data on the solubility of boric acid stable solid phases and also of lithium borates in water in the temperature range from 273 to 350 degrees C are processed. For the H3BO3/HBO2/B2O3 + H2O system, the temperature intervals corresponding to equilibrium existence of solid (crystalline, denoted by the subscript "cr") phases of boric acid H3BO3(cr), HBO2(cr), and B2O3(cr) are considered. For each of these phases, formulas for calculating the solubility in water as a function of absolute temperature are obtained. For crystal hydrates of lithium borates, four temperature intervals are identified taking into account different numbers of connected water molecules, and formulas for determining the temperature dependences of solubility are derived for each of them with taking phase transformations into account. For estimating the accuracy of correlations for solubility calculations obtained from processing the totality of experimental data, the average relative error values are determined. It is shown that the above-mentioned formulas give sufficiently accurate replication of experimentally obtained solubility values in the H3BO3/B2O3 + H2O and LiBO2 + H2O systems in the entire range of temperatures considered.
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Kharitonova, N. L. Solubility Equations of Boron Compounds under Coolant Conditions in VVER-Type Reactor Plants / Kharitonova, NL, Gurbanova, SA // Thermal Engineering. - 2021. - 68. - № 10. - P. 743-751. - 10.1134/S0040601521090020
URI
https://www.doi.org/10.1134/S0040601521090020
https://www.scopus.com/record/display.uri?eid=2-s2.0-85116382158&origin=resultslist
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https://openrepository.mephi.ru/handle/123456789/24761
https://www.scopus.com/record/display.uri?eid=2-s2.0-85116382158&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000703490500002
https://openrepository.mephi.ru/handle/123456789/24761