Metal layer molten pool heat transfer characteristics simulation material, preparation method and application

Abstract

A metal layer molten pool heat transfer characteristic simulation material, preparation method and application, the metal layer simulation material includes metal bismuth and bismuth iodide, and the Prandtl number Pr of the simulation material at 500°C is 0.08-0.12. The preparation process of the simulated material includes: configuring a bismuth iodide molten salt; heating the metal bismuth until the metal bismuth is completely melted, and continuing to heat to a temperature T; at the temperature T, adding the configured iodide to the molten metal bismuth repeatedly and slowly Bismuth molten salt; after the bismuth iodide crystal on the metal bismuth surface layer is completely melted, the metal layer simulation material is obtained. The Pr number of the metal layer simulation material provided by the invention is 0.08-0.12 in the working state, which is closer to the Prandtl number of the real material, so it can more accurately and reliably simulate the real metal layer material, and more accurately reflect the reactor prototype. The heat transfer characteristics of the metal layer of the metal layer molten pool in the lower head can effectively reduce the uncertainty of the heat transfer relationship obtained by the experiment, and provide data support for the formulation and implementation of the retention strategy in the melt stack.

Description

technical field [0001] The invention relates to the technical field of simulating materials for molten pools in the lower head after severe accidents, in particular to materials for simulating heat transfer characteristics of molten pools of metal layers, preparation methods and applications, which can be used for experimental research on the mechanism and mitigation measures of severe reactor accidents. Background technique [0002] When a serious reactor accident occurs, if the core cannot be effectively cooled, it will heat up rapidly and melt to form a molten pool inside the core. With the development of severe accidents, the molten pool inside the core migrates to the side and downward, and finally enters the interior of the lower head. The melt inside the lower head will gradually accumulate to form a molten pool structure, which will continuously transfer decay heat to the wall of the lower head. When the decay heat cannot be fully exported through the wall, the integ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a simulation material, preparation method and application of the heat transfer characteristics of the molten pool of the metal layer, so as to solve the difference between the Prandtl number of the metal layer at high temperature and the Prandtl number and physical properties of the real material in the prior art , resulting in low accuracy and reliability of simulation results, providing reasonable and feasible simulation materials for experimental research on heat transfer characteristics of metal layers in severe accidents