Study on the Radiation Heat Transfer Effect of the Covered Gas Space of the Pool Reactor

Abstract

Abstract The construction of fast reactor main vessel’s roof slab consists of large argon cavity, plug cock, part of biological shielding column, main pump and heat-exchangers as well as a large number of small-size air gap between plug cock and argon cavity. Therefore, it has an important significant to carry out a thermal hydraulic behavior research on blanket gas top of the main vessel for getting detailed temperature distribution. The temperature field in the headspace of the main vessel of the sodium-cooled fast reactor is of great significance to the analysis of the structural integrity of the reactor. The construction of fast reactor main vessel’s roof consists of large argon cavity, plug cock, Because of the enormous structure of argon cavity. Due to the large space structure of argon gas at the top of the main container, large space and micro-slit space exist at the same time, two orders of magnitude different, which brings difficulties to the theoretical analysis of temperature field. In order to study the distribution of temperature field in the top space of the main vessel, ANSYS series of computational fluid dynamics (CFD) software used to model and simulate the top space of the main vessel of the sodium cold fast reactor. Therefore, based on the existing data, this paper conducts a more detailed simulation study on the thermo-hydraulic behavior of the covering gas in the complex space on the top of the main container of fast reactor. The calculation shows that the symmetry of calculation is good and the flow process is in line with the natural circulation caused by temperature difference. The simulation results are good and can used as the basis and reference for further analysis, which is of positive significance to reactor operation safety.