A Spherical Fuel Element Simulator for Measuring Wall Temperature and Its Assembly Process

Abstract

The invention discloses a spherical fuel element simulator being convenient for wall temperature measurement and assembly technology for the spherical fuel element simulator being convenient for the wall temperature measurement. The spherical fuel element simulator provided by the invention comprises a rodlike electrical heating element; two ends of the electrical heating element are respectively connected with an upper current-conducting plate and a lower current-conducting plate; an internally-concaved blind hole is arranged at one end of the electrical heating element; a round hole communicated with the bottom of the blind hole is arranged on the side wall of the electric heating element; a sheathed thermocouple is installed in the blind hole; an insulating bush is arranged between the sheathed thermocouple and the electric heating element; and the round hole is filled and soldered with silver soldering. With the adoption of the spherical fuel element simulator provided by the invention, the sheathed thermocouple in each electric heating element can be installed, and any depth in any electric heating element can be measured; and the spherical fuel element stimulator is applicable to an irrigation work feature test; geometry size and arrangement size of the electrical heating element are figured out by taking the spherical fuel element stimulator as a standard and according to porous media fluid dynamics and heat transfer theory; and with the adoption of the spherical fuel element simulator, thermotechnical irrigation work features of the spherical fuel element can be effectively stimulated.

Description

technical field [0001] The invention relates to a simulation part for measuring wall temperature, in particular to a spherical fuel element simulation part which is convenient for measuring wall temperature and an assembly process thereof. Background technique [0002] Spherical fuel element water-cooled reactor is a new concept nuclear reactor, which expands the application of spherical fuel elements to light water reactors. Unlike high-temperature gas-cooled reactors, this type of reactor uses light water as a coolant, and the diameter of spherical fuel elements is smaller. The spherical structure and small size of the spherical fuel element reduce the possibility of the occurrence of the critical heat flux CHF. When the heat flux reaches the value corresponding to the transition from nucleate boiling to film boiling, there are many bubbles on the heating surface, so that many bubbles Connected into one piece, covering part of the heating surface. Due to the low heat tran...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a spherical fuel element simulation piece that is convenient for measuring the wall temperature, solve the problem of difficult measurement of the surface temperature of the equivalent analog element of the spherical fuel element, and meet the requirements of the heating element and the temperature measuring device for the simulation experiment of the thermal hydraulic characteristics of the spherical fuel element. needs

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