High-temperature heating clamping experiment device for fuel bundles of pressurized water reactor

Abstract

A high-temperature heating clamping experiment device for fuel bundles of a pressurized water reactor comprises 3*3 bundles of the reactor, wherein the bundles are arranged in a high-temperature smelting furnace and clamped and fixed by two high-temperature rhenium-molybdenum electrodes at upper and lower ends, and each rhenium-molybdenum electrode comprises a first electrode chuck, a second electrode chuck and a rhenium-molybdenum plate; the first electrode chuck and the second electrode chuck which are mutually matched are arranged at one end of each rhenium-molybdenum plate; a semicirculargroove is formed in each first electrode chuck and each second electrode chuck, and each first electrode chuck and each second electrode chuck are mounted together and matched to form a round hole toclamp a conductive cap at the top end of each fuel bundle. During an experiment, when a molten material drips to the electrodes, all that is required is to replace the first electrode chucks and the second electrode chucks instead of replacing the rhenium-molybdenum plates, so that loss caused by damage is reduced greatly, and the problems of high cost and high loss caused by replacement of rhenium-molybdenum electrodes due to electrode damage in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of research on the behavior characteristics of the reactor core under severe reactor accident conditions, in particular to a high-temperature heating and clamping experimental device for fuel rod bundles of a pressurized water reactor. Background technique [0002] The development process of severe reactor accidents is a complex physical and chemical process in which gas, liquid, and solid coexist, and various physical materials are cross-combined. The process includes early oxidation, eutectic phenomenon, and core fuel rod candling, core flow channel blockage, core molten pool formation, molten pool rupture and flow into the lower head and other processes. Among them, the candling of fuel rods in the reactor core, as well as the blockage of the core flow channel and the formation of the core molten pool are the key links in the study of severe accident sequences. This process can provide source terms for t...

AI Technical Summary

Problems solved by technology

During the experiment, the melt in the reactor will be cooled and solidified in different physical spaces and different temperature environments, causing damage to the clamping device. The clamping device must be replaced for subsequent experiments, because the clamping device is made of rhenium molybdenum If the electrode is replaced, it will increase the cost

In addition, the existing rhenium-molybdenum electrodes are in the form of plates. By extruding two rhenium-molybdenum plates, irregular holes are formed to clamp the fuel rods, resulting in relatively small contact area and high resistance, which may damage the electrodes. cause damage

In addition, the existing experiments are aimed at a single fuel rod, so it is impossible to study the blockage of the core flow channel and the interaction between the fuel rods.

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