Open AccessThe simulate of the stratification of an explosive mixture of hydrogen and air in the RBMK-1000 spent-fuel storage pool
Author(s) -
A. M. Osipov,
E U Bragin,
S V Prochorenkov,
I A Tupotilov
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1689/1/012004
Subject(s) - hydrogen , explosive material , rbmk , nuclear engineering , stratification (seeds) , spent nuclear fuel , environmental science , waste management , chemistry , nuclear reactor , engineering , seed dormancy , botany , germination , organic chemistry , dormancy , biology
Currently, in Russia, codes with concentrated parameters are used as software tools to justify the hydrogen explosion safety of nuclear power units, which use the concept of “average concentration of hydrogen” in the calculated volume and do not take into account the stratification of hydrogen, due to which local concentrations of hydrogen can significantly exceed the “average”. This paper presents the hydrogen explosion safety analysis results during a beyond-design accident in the RBMK-1000 spent-fuel storage pool taking into account local concentrations of gas components using the gas dynamic code ANSYS FLUENT. The vapor-gas mixture propagation problem in the spent-fuel storage pool was solved in a two-dimensional approximation. The following sources of hydrogen were considered radiolysis hydrogen generation, hydrogen generation by reducing its solubility in water and the vapor-zirconium reaction. As a result of modeling, the possible accumulation areas of an explosive mixture and their sizes were determined. It is shown that under certain combinations of boundary conditions, due to the presence of convective flows, an explosive concentration is not achieved even if the mixture components stratification is taken into account.