An experimental device and method for measuring the temperature field of a liquid metal reactor heat exchanger breach accident

Abstract

The invention discloses a temperature field measurement experimenting device and a temperature field measurement experimenting method for a break accident of a liquid metal reactor heat exchanger. The temperature field measurement experimenting device consists of a liquid metal storage tank (1), a liquid metal valve (2), a reaction vessel (3), a high-pressure water pipeline (4), a thick-wall corrugated pipe (5), a pneumatic hydraulic pump (6 ), a thermocouple conduit (7), a thermocouple cluster (8), a heating wire (9), a thermocouple hanging bracket (10), thermocouple welding points (11) and a protective gas pipeline (12). Through upward movement of the pneumatic hydraulic pump (6), the high-pressure water pipeline connected with the thick-wall corrugated pipe and provided with a precrack is pulled apart so as to achieve a fixed-point break of the pipeline in a high-temperature and high-pressure medium and micro sealing of the high-pressure reaction vessel; through point welding of ends of thermocouples at multiple points on the hanging bracket, an omni-directional three-dimensional matrix measurement on a temperature transient of the high-temperature and high-pressure medium can be achieved. A multi-medium coupling temperature field measurement method has an important scientific value and engineering significance.

Description

technical field [0001] The invention relates to the technical field of measuring the temperature field of a liquid metal reactor heat exchanger breach accident, in particular to a device and method for measuring the temperature field of a metal reactor heat exchanger breach accident. Background technique [0002] In view of the continuous depletion of world energy and the global society's panic about nuclear safety after the Fukushima accident, various research institutions in the world are vigorously developing accelerator-driven subcritical system (ADS) lead-bismuth liquid metal cooling reactors to realize transmutation processing of high-level nuclear waste, Production of nuclear fuel and other functions. At present, it is recognized by the world as one of the most potential possible ways to dispose of a large amount of radioactive waste and reduce the risk of deep burial storage. [0003] The ADS system is mainly composed of a proton accelerator system, a spallation tar...

AI Technical Summary

Problems solved by technology

Because ADS generally chooses to immerse the steam generator directly into the lead-bismuth primary circuit, when the heat exchanger pipe breaks, the high-pressure cooling water in the secondary circuit of the heat exchanger directly contacts with the lead-bismuth alloy, resulting in a strong interaction. It may lead to rapid overcooling of the lead-bismuth alloy on the surface in contact with water, resulting in solidification, preventing the flow of surrounding liquid metal, and then causing local heat transfer tube blockage, deteriorating heat transfer, and endangering the safety of the reactor.

[0005] However, when a breach accident occurs, the pressure of the reaction vessel will increase sharply. There are still many difficulties in simulating the real accident conditions in a high-temperature and high-pressure environment and performing related temperature field measurements, such as fixed-point fracture and reaction of high-pressure circulating water pipes in high-temperature and high-pressure environments. Fretting sealing of containers, omni-directional matrix measurement of temperature field

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