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Heating device for simulating different temperature control of fuel rods and spent pools

A technology for heating devices and fuel rods, which is applied in the direction of measuring devices, electric devices, electromagnetic measuring devices, etc., can solve problems affecting the performance of fuel components, etc., and achieve the effects of high degree of automation, wide application range, and simple operation

Active Publication Date: 2022-02-22
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The fuel rod cladding in the fuel assembly after operation will corrode and form an oxide film, these factors seriously affect the performance of the fuel assembly

Method used

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  • Heating device for simulating different temperature control of fuel rods and spent pools
  • Heating device for simulating different temperature control of fuel rods and spent pools

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 , figure 2 As shown in , the heating device for simulating different temperature control of fuel rods and spent pools includes the standard rod for simulating fuel rods and the heating mechanism for simulating spent pools;

[0044] The standard rod includes a heater 2 and a cladding tube 1, the cladding tube 1 is a zirconium alloy cladding tube, the heater 2 is made of 304 stainless steel, and the heater 2 is arranged on the cladding tube 1 On the inner side, the two ends of the cladding tube 1 and the outer wall of the heater 2 are encapsulated by a waterproof and high-temperature resistant material. Using hexagonal boron nitride;

[0045] The heater 2 includes a metal tube, and a heating element and a filling material are arranged in the metal tube. The heating element and the filling material are respectively Cr20Ni80 and hexagonal boron nitride. The outer wall of the cladding tube 1 is provided with a thermocouple 3, the thermocouple 3 is a K-type ...

Embodiment 2

[0053] like figure 1 , figure 2 As shown, this embodiment is based on Embodiment 1, and also includes a temperature control system, which includes a controller, a solenoid valve, a temperature controller, and a temperature sensor. Both the cold water inlet pipe 7 and the hot water inlet pipe 8 are A solenoid valve is provided;

[0054] The temperature controller is used to collect the temperature signal measured by the thermocouple 3 and transmit the temperature signal to the controller;

[0055] The temperature sensor is used to collect the temperature signal of the water environment in the standard sample tank 5 and transmits the temperature signal to the controller;

[0056] The controller is used to receive temperature signals from the temperature controller and the temperature sensor, and analyze and judge whether to open the solenoid valve on the cold water inlet pipe 7 or the hot water inlet pipe 8 .

[0057] The working process of this embodiment is as follows:

...

Embodiment 3

[0061] like figure 1 , figure 2 As shown, the present embodiment is based on embodiment 1, and also includes a stirring device, and the stirring device includes a circulation pump and a frequency conversion controller of the circulation pump, and realizes stirring the water environment in the standard sample tank 5 by the circulation pump; the circulation pump The frequency conversion controller is used to adjust the output flow of the circulation pump.

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Abstract

The invention discloses a heating device for simulating different temperature control of a fuel rod-spent pool, comprising a standard rod for simulating a fuel rod and a heating mechanism for simulating a spent pool; the standard rod includes a heater and a cladding tube, and the heater It is arranged inside the cladding tube, and the two ends of the cladding tube and the outer wall of the heater are encapsulated by a waterproof and high-temperature resistant material; the heater includes a metal tube, and Cr20Ni80 and hexagonal boron nitride are arranged in the metal tube, and the cladding tube The outer wall of the tube is provided with a thermocouple; the heating mechanism includes a standard sample tank and a standard sample rod installation stand; the standard sample tank is used to provide a water environment, and the standard sample tank is provided with a cold water inlet pipe, a hot water inlet pipe and a Drainage pipe; the standard sample rod installation stand is installed on the top of the standard sample groove, and the standard sample rod installation stand is used for installing the standard sample rod. The heating device of the present invention can simulate the temperature of the fuel rods and the temperature of the water environment of the exhaust pool, can simulate environments with different temperature controls, and then complete the curves for measuring the thickness of the oxide film under different temperature controls.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel heating, in particular to a heating device for simulating different temperature control of fuel rods and spent pools. Background technique [0002] The fuel rod cladding in the fuel assembly after operation will corrode and form an oxide film, and these factors seriously affect the performance of the fuel assembly. In order to ensure the safe operation of the reactor, the oxide film thickness of the irradiated fuel components (rods) should be checked after a period of operation, and the components exceeding the limit should be replaced. [0003] After the irradiated fuel rods are unloaded, they are placed in the spent pool. Due to the internal self-heating of the fuel rods (maintained at 70°C-100°C), the temperature of the surrounding water in the spent pool (30°C-50°C), and the oxidation film Thickness measurement needs to be carried out in the exhausted pond water, and the factors that mos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/06G01K7/02
CPCG01B7/10G01K7/02
Inventor 高三杰阳雷邱绍宇李宁姚力夫郝腾飞陈卫林
Owner NUCLEAR POWER INSTITUTE OF CHINA