CN108447573A - A nuclear reactor fuel rod melting visualization experiment device and method - Google Patents

Abstract

A kind of nuclear reactor fuel rod fusing visual experimental apparatus and method, it include the high temperature smelting furnace with several saturating windows, testpieces is vertically arranged in high temperature smelting furnace, the top and bottom of testpieces are respectively arranged with rhenium molybdenum electrode, rhenium molybdenum electrode is by testpieces, rhenium molybdenum electrode is connected with the copper electrode across high-temperature fusion furnace sidewall, testpieces includes fuel rod, it is provided with W-Re heating rod in fuel rod, is provided on the outside of high temperature smelting furnace for carrying out cooling cooling water recirculation system to high temperature smelting furnace.The present invention ensures that furnace body temperature outside is maintained within security restriction by high temperature smelting furnace cooling water recirculation system, and external high-speed camera instrument can work normally, being capable of core melt progression under the conditions of real simulation reactor disaster.The experimental data that the present invention obtains can provide verification for conventional numeric analogy method, reduce the uncertainty of existing Analysis Codes of Severe Accident.

Description

A nuclear reactor fuel rod melting visualization experiment device and method

technical field

The invention relates to a visualization experiment device and method under severe accident conditions, in particular to a nuclear reactor fuel rod melting visualization experiment device and method, and belongs to the field of experiment measurement visualization methods.

Background technique

The material in the reactor will melt into a liquid state when it reaches its own melting point. The eutectic effect of different materials will further reduce this melting temperature. These core material melts will flow downward and enter the lower horizontal position of the reactor core, and there is a certain probability that the area of the reactor coolant flow channel will be reduced. With the further development of severe accidents, core melts continue to accumulate in the coolant flow channels, which will lead to blockages in the flow channels between some fuel assemblies, which will further reduce the cooling capacity of the core and make the serious accident of the reactor continue to worsen. . If it is not relieved, it is very likely that a local meltthrough will occur inside the reactor and cause the entire upper reactor structure to collapse, further expanding the melted area of the core. Therefore, under severe accident conditions, the eutectic phenomenon of metal materials, cladding oxidation, cracking behavior, and melt clogging that occur during fuel rod melting and molten material migration are important links in the severe accident sequence, and they are important for subsequent internal and external reactors. The Severe Incident process provides source terms. Therefore, if timely accident mitigation measures can be taken during the melting of fuel rods, the harm of serious accidents will be greatly weakened and the safety of public life and property will be reduced. But reactor core melting is a nonlinear and incoherent complex physical and chemical phenomenon under the condition of high temperature and high pressure. This makes the research and analysis of the phenomenon very difficult, and the traditional severe accident analysis program simulation faces great challenges in this respect. Because the specific process and phenomenon of fuel rod melting inside the reactor cannot be observed in the existing device, the existing severe accident analysis program can only simulate and analyze the macroscopic lumped parameters, and cannot accurately describe the process and mechanism of the severe accident.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a nuclear reactor fuel rod melting visualization experimental device and method.

To achieve the above object, the present invention adopts the following technical solutions:

A nuclear reactor fuel rod melting visualization experiment device includes a high-temperature melting furnace with several windows, a test piece is vertically arranged in the high-temperature melting furnace, rhenium-molybdenum electrodes are respectively arranged at the upper end and the lower end of the test piece, and the rhenium-molybdenum electrodes connect The test piece, the rhenium-molybdenum electrode is connected with the copper electrode passing through the side wall of the high-temperature melting furnace, the test piece includes a fuel rod, and a tungsten-rhenium heating rod is arranged inside the fuel rod, and a cooling device for cooling the high-temperature melting furnace is arranged outside the high-temperature melting furnace water circulatory system.

The further improvement of the present invention is that the top of the high-temperature melting furnace is provided with an upper furnace cover, and the bottom is provided with a lower furnace cover, the upper furnace cover is connected with a hydraulic press, the lower furnace cover is connected with a forklift, the upper furnace cover is controlled by a hydraulic Lifting is controlled by a forklift.

The further improvement of the present invention is that a crucible is arranged under the fuel rod, and the crucible is arranged on the lower furnace cover; through the side wall of the high-temperature melting furnace, six tungsten-rhenium thermocouples are arranged at different heights for measuring the temperature of the fuel rod.

The further improvement of the present invention lies in that the side wall of the furnace body of the high-temperature melting furnace is provided with 6 through windows, and the 6 through windows are spirally arranged along the side wall of the furnace body and evenly distributed in the circumferential direction.

The further improvement of the present invention is that the vertical distance between two adjacent through windows is 0.16m; the through windows are in the shape of a truncated cone, the diameter of the top opening of the through window is 25mm, and the diameter of the bottom opening is 74mm.

The further improvement of the present invention is that a circular cover plate is provided on the side wall of the high-temperature melting furnace at the window, quartz glass is provided between the circular cover plate and the side wall of the high-temperature melting furnace, and a circular cover plate is provided on the circular cover plate. hole.

The further improvement of the present invention is that the circular cover plate is fixed on the side wall of the high-temperature melting furnace by screws, the quartz glass is cylindrical, an O-shaped sealing ring is arranged between the circular cover plate and the quartz glass 9, and the side wall of the quartz glass A rectangular sealing ring is arranged on the wall.

A further improvement of the present invention is that the diameter of the quartz glass is 40 mm.

The further improvement of the present invention is that the cooling water circulation system includes a water tank, pipes are provided on the upper furnace cover, pipes are provided on the side wall of the high-temperature melting furnace body, pipes are provided on the lower furnace cover, and pipes are provided on the copper electrodes; the outlet of the water tank is connected to the The inlet of the water pump is connected, and the outlet of the water pump is connected with the five-way water separator. The pipeline inlet on the copper electrode is connected to the Roots pump inlet, the pipeline outlet on the upper furnace cover, the pipeline outlet on the side wall of the high-temperature melting furnace body, the pipeline outlet on the lower furnace cover, the pipeline outlet on the copper electrode and the Roots pump The outlets are all connected to the inlet of the water collector, and the outlet of the water collector is connected to the inlet of the water tank; a water level gauge is installed in the water tank, a cooling tower is installed above the water tank, a lifting pump is installed in the water tank, and the outlet of the lifting pump is connected to the cooling tower.

An experimental method. Turn on the feedwater pump and the lifting pump. The feedwater pump is located outside the water tank and connected to the five-way water distributor. The cooling water in the water tank is sent to the five-way water distributor and then flows to the corresponding experimental equipment respectively. The cooling water is cooled. Corresponding to the experimental equipment, it is collected into the water collector, and the water collector is connected with the water tank, and the cooling water finally flows back to the water tank; the lifting pump is located at the bottom of the water tank, and lifts the water in the water tank to the high cooling tower, and the cooling water flows after being cooled by air. Return to the water tank; then vacuumize the high-temperature melting furnace, and when the vacuum degree in the high-temperature melting furnace reaches the set value, argon gas is introduced, and the argon gas is passed into the high-temperature melting furnace from the bottom of the furnace until the pressure in the high-temperature melting furnace reaches 1.2MPa, the alternating current passes through the water-cooled copper electrode and rhenium-molybdenum electrode, and flows into the tungsten-rhenium heating rod to electrically heat the fuel rod; the high-speed camera captures the melting and migration dynamic process of the fuel rod in the furnace through the window of the furnace wall and saves it in real time, and the tungsten-rhenium A thermocouple measures the temperature of the zirconium-4 alloy on the outer surface of the fuel rod and saves it.

Compared with the prior art, the present invention has the following beneficial effects:

The experimental device of the present invention provides a transparent window on the high-temperature melting furnace, and a high-speed camera can be arranged outside the transparent window to observe the experimental situation in the high-temperature melting furnace through the high-speed camera, which overcomes the inability to observe the specific process of fuel rod melting in the existing device Due to the presence of a high-speed camera outside the furnace, the entire experimental device needs to be cooled. Therefore, a cooling water circulation system is added in the present invention. The experimental device of the present invention is simple in structure, can be realized, and can visually reveal the melting of the core material and the transient behavior characteristics of the migration of the melt, and obtaining visual image data can be a traditional numerical simulation method. Provide verification. The invention helps to grasp the mechanism of key phenomena and reduces the uncertainty of the core melting process.

Further, the lifting of the upper furnace cover is controlled by a hydraulic machine, and the lifting of the lower furnace cover is controlled by a forklift, which is convenient for control.

Furthermore, the six through windows are spirally arranged along the side wall of the furnace body, and are evenly distributed in the circumferential direction, which is beneficial to observe the melting conditions of the fuel rods at different angles.

Furthermore, since the reactor fuel rods will be melted under high temperature conditions above 2000° C., the surface of the window will be subjected to a large amount of heat transfer by radiation. Excessive window area will cause its surface temperature to be too high and be damaged. On the other hand, if the area of the window is too small, the viewing angle will be too small to record the melting process of the entire fuel rod. Considering comprehensively, the visualization experiment device adopts a circular frustum-shaped transparent window. The diameter of the top opening of the transparent window is 25mm, and the diameter of the bottom opening is 74mm. The dynamic recording of fuel rod melting and migration can be realized through the frustum-shaped window of the invention.

Further, the size of the quartz glass is small to reduce the radiation heat transfer and reduce the surface temperature of the quartz glass, so the diameter of the quartz glass in the present invention is 40mm. The furnace body is equipped with a circular platform-shaped transparent window to increase the viewing angle. The high-speed camera outside the high-temperature melting furnace can record the melting process of fuel rods in real time through the circular frustum-shaped window on the furnace wall.

The cooling water circulation system of the high-temperature melting furnace ensures that the temperature outside the furnace body is kept within the safety limit, and the external high-speed camera can work normally. This method can truly simulate the core melting process under severe reactor accident conditions. The experimental temperature in the present invention is as high as above 2000°C, and the experimental data obtained in the present invention can provide verification for traditional numerical simulation methods and reduce the uncertainty of existing severe accident analysis procedures. Since the experimental data obtained in the open literature cannot meet my country's demand for autonomy in severe accident procedures for reactors, the experimental method of the present invention is used to conduct research on the melting of core materials and the migration characteristics of molten materials. For the development of nuclear energy science and engineering in my country, It is extremely important to study the process and mechanism of severe reactor accidents.

Description of drawings

Figure 1 is a three-dimensional schematic diagram of the experimental device of the high-temperature melting furnace.

Figure 2 is a schematic diagram of a frustum-shaped through window.

Fig. 3 is a structural schematic diagram of the nuclear reactor fuel rod melting visualization experimental device of the present invention.

In the figure, 1 is the control cabinet, 2 is the Roots pump, 3 is the sliding valve pump, 4 is the ladder, 5 is the support frame, 6 is the high temperature melting furnace, 7 is the forklift, 8 is the hydraulic machine, 9 is the quartz glass, 10 is the Rectangular sealing ring, 11 is a screw, 12 is an O-ring, 13 is a vacuum tube, 14 is a vacuum valve, 15 is a vacuum gauge, 16 is an upper furnace cover, 17 is a lower furnace cover, 18 is a furnace side wall, 19 20 is a tungsten-rhenium thermocouple, 21 is a copper electrode, 22 is a rhenium-molybdenum electrode, 23 is a crucible, 24 is a tungsten-rhenium heating rod, 25 is a fuel rod, 26 is a water supply pump, 27 is a lift pump, and 28 is a Cooling tower, 29 is a water level gauge, 30 is a water tank, 31 is a water distributor, 32 is a water collector, 33 is a water source, and 34 is a replenishment valve.

Detailed ways

The present invention will be described in detail below by means of the accompanying drawings.

Referring to Fig. 1, Fig. 2 and Fig. 3, the visualization experiment method of the present invention is mainly realized through six trapezoidal water-cooling windows and the cooling water circulation system of the high-temperature melting furnace. The experimental method of the invention can visually reveal the melting of the core material and the migration transient behavior characteristics of the molten material, and the obtained visual image data can provide verification for the traditional numerical simulation method. The invention helps to grasp the mechanism of key phenomena and reduces the uncertainty of the core melting process.

The nuclear reactor fuel rod melting visualization experimental device of the present invention is shown in FIG. 1 . The nuclear reactor fuel rod melting visualization experimental device includes a high-temperature melting furnace 6 with several windows. A test piece is vertically arranged in the high-temperature melting furnace 6. The upper and lower ends of the test piece are respectively provided with rhenium-molybdenum electrodes 22. The rhenium-molybdenum electrodes 22 are used To clamp the test piece and conduct electricity, the rhenium-molybdenum electrode 22 is connected to the copper electrode 21 passing through the side wall of the high-temperature melting furnace. The test piece includes a tungsten-rhenium heating rod 24 arranged in the center, and a fuel rod is arranged on the outside of the tungsten-rhenium heating rod 24 25. The fuel rod 25 wraps the tungsten-rhenium heating rod 24, that is, the tungsten-rhenium heating rod 24 is located at the center of the fuel rod 25, and the outer surface of the fuel rod is zirconium-4 alloy. The top of the high-temperature melting furnace is provided with an upper furnace cover 16, and the bottom is provided with a lower furnace cover 17. The upper furnace cover 16 is connected with the hydraulic press 8, and the lower furnace cover 17 is connected with the forklift 7. The upper furnace cover 16 is controlled by the hydraulic press 8. Cover 17 is lifted and lowered by forklift 7 control.

A crucible 23 is arranged below the fuel rod 25 , and the crucible 23 is arranged on the lower furnace cover 17 . Six tungsten-rhenium thermocouples 20 are arranged at different heights through the side wall of the high-temperature melting furnace for measuring the temperature of the fuel rod 25 .

The furnace side wall 18 of the high-temperature melting furnace 6 is provided with 6 through windows 21, and the 6 through windows are spirally arranged along the side wall of the furnace body, and are evenly distributed in the circumferential direction. The distance is 0.16m. Because the reactor fuel rods will be melted under high temperature conditions above 2000°C, the surface of the window will be subjected to a large amount of radiation heat transfer. Excessive window area will cause its surface temperature to be too high and be damaged. On the other hand, if the area of the window is too small, the viewing angle will be too small to record the melting process of the entire fuel rod. Considering comprehensively, the visualization experiment device adopts a circular frustum-shaped transparent window. The diameter of the top opening of the transparent window is 25mm, and the diameter of the bottom opening is 74mm.

The frustum-shaped window is shown in Figure 2. The window entrance is provided with a circular cover plate with a round hole on the side wall of the high-temperature melting furnace 6, and 6 screws 11 are evenly distributed along the circumference on the circular cover plate, and the circular cover plate is connected to the side wall of the high-temperature melting furnace. The walls are connected by screws. A cylindrical quartz glass 9 is arranged between the circular cover plate and the side wall of the high-temperature melting furnace 6, and an O-shaped sealing ring 12 is arranged between the circular cover plate and the quartz glass 9, and the side wall of the quartz glass 9 is provided with The rectangular sealing ring 10 ensures the airtightness of the device at the same time. The diameter of the quartz glass is 40mm, and the size is small to reduce the heat transfer of radiation and reduce the surface temperature of the quartz glass. The furnace body inside the quartz glass is provided with a circular frustum-shaped window to increase the viewing angle. The high-speed camera outside the high-temperature melting furnace can record the melting process of fuel rods in real time through the circular frustum-shaped window on the furnace wall. Since there is a high-speed camera outside the furnace, the entire experimental device needs to be cooled.

The cooling water circulation system of the high-temperature melting furnace 6 is shown in FIG. 3 . The cooling water circulation system includes a water tank 30, a pipeline is provided on the upper furnace cover 16, a pipeline is provided on the side wall of the high-temperature melting furnace body, a pipeline is provided on the lower furnace cover 17, and a pipeline is provided on the copper electrode 21; the water tank 30 and the water pump 28 inlet The outlet of the water pump 28 is connected to the five-way water separator 31, and the outlet of the five-way water separator 31 is respectively connected to the pipeline inlet on the upper furnace cover, the pipeline inlet on the side wall of the high-temperature melting furnace body, and the pipeline on the lower furnace cover 17. The inlet, the pipeline inlet on the copper electrode 21 and the Roots pump 2 inlet are connected, the pipeline outlet on the upper furnace cover 16, the pipeline outlet on the side wall of the high-temperature melting furnace body, the pipeline outlet on the lower furnace cover 17, and the copper electrode 21. The outlet of the pipeline and the Roots pump 2 outlet are all connected to the inlet of the water collector 32, and the outlet of the water collector 32 is connected to the water tank 30.

A water level gauge 29 is arranged in the water tank 30, a cooling tower 28 is arranged above the water tank 30, a lifting pump 27 is arranged in the water tank 30, and the outlet of the lifting pump 27 is connected with the cooling tower 28; Into the five-way water separator 31, it flows into the upper furnace cover 16, the side wall of the furnace body, the Roots pump 2, the copper electrode 21 and the lower furnace cover 17 respectively. The cooling water is collected into the water collector 32 after cooling the corresponding experimental equipment, and finally flows back to the water tank 30 . During the experiment, the cooling water circulation system will output the inlet and outlet water temperatures and the water level of the water tank in real time. If the inlet and outlet water temperatures exceed the limit value or the water level of the water tank is lower than the limit value, the replenishment valve 34 will be activated to replenish the water source 33 to the water tank 30. The water source 33 and A replenishment valve 34 is arranged between the water tanks 30 . On the other hand, the water in the water tank 30 is lifted to the high cooling tower 28 by the lift pump 27 , and the cooling water flows back into the water tank 30 after being air-cooled. The cooling water circulation system ensures the safety of experimental equipment for fuel rods under high temperature conditions above 2000°C. The frustum-shaped window of the invention can realize the dynamic recording of fuel rod melting and migration, and the experimental data obtained by the invention can provide verification for traditional numerical simulation methods and reduce the uncertainty of existing serious accident analysis procedures.

One side of the Roots pump 2 is connected to the control cabinet 1, and the other side of the Roots pump 2 is connected to the slide valve pump 3. The Roots pump 2 is connected to the interior of the high-temperature melting furnace through a vacuum tube 13. The vacuum tube 13 is provided with a vacuum valve 14 and Vacuum gauge15.

A support frame 5 is provided outside the high-temperature melting furnace, and a step 4 is provided on one side of the support frame 5 .

During the experiment, start the feed water pump 26 and the lifting pump 27 of the cooling water circulation system, the feed water pump 26 is located outside the water tank 30 and is connected with the five-way water separator 31, and the cooling water in the water tank 30 is sent to the five-way water separator 31, respectively Flowing to the corresponding experimental equipment, the cooling water cools the corresponding experimental equipment and converges into the five-way water collector 33 , the five-way water collector 33 is connected to the water tank 30 , and the cooling water finally flows back to the water tank 30 . The lifting pump 27 is located at the bottom of the water tank 30 , and lifts the water in the water tank 30 to the cooling tower 28 at a high place, and the cooling water flows back into the water tank 30 after being air-cooled. Then start the slide valve pump 3 and the Roots pump 2, the slide valve pump 3 and the Roots pump 2 are connected to the inner cavity of the high-temperature melting furnace through the vacuum pipeline 15, and the high-temperature melting furnace is evacuated. When the vacuum degree in the high-temperature melting furnace reaches the set After the value is set, the argon system starts up. A constant flow of argon gas is passed into the high-temperature melting furnace from the bottom of the furnace until the pressure in the furnace reaches 1.2 MPa. Then the alternating current passes through the water-cooled copper electrode 21 and the rhenium-molybdenum electrode 34 , and flows into the tungsten-rhenium heating rod 24 to electrically heat the fuel rod 25 . The high-speed camera shoots and saves the melting and migration dynamic process of the fuel rods in the furnace in real time through the windows of the furnace wall, and the tungsten-rhenium thermocouple 20 measures and saves the temperature of the zirconium-4 alloy on the outer surface of the fuel rods.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple deduction or replacement can also be made, all of which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims (10)

1. a kind of nuclear reactor fuel rod melts visual experimental apparatus, which is characterized in that include the height with several saturating windows Warm melting furnace is vertically arranged with testpieces in high temperature smelting furnace, and the top and bottom of testpieces are respectively arranged with rhenium molybdenum electrode (22), testpieces, rhenium molybdenum electrode (22) are connected by rhenium molybdenum electrode (22) with the copper electrode (21) across high-temperature fusion furnace sidewall, try It includes fuel rod (25) to test part, and W-Re heating rod (24) is provided in fuel rod (25), is provided with and is used on the outside of high temperature smelting furnace Cooling cooling water recirculation system is carried out to high temperature smelting furnace.

2. a kind of nuclear reactor fuel rod according to claim 1 melts visual experimental apparatus, which is characterized in that high temperature Bell (16) is provided at the top of melting furnace, bottom is provided with lower bell (17), and upper bell (16) is connected with hydraulic press (8), Lower bell (17) is connected with fork truck (7), and upper bell (16) is controlled by hydraulic press (8) and lifted, and lower bell (17) is controlled by fork truck (7) Lifting.

3. a kind of nuclear reactor fuel rod according to claim 2 melts visual experimental apparatus, which is characterized in that fuel Crucible (23) is provided with below stick (25), crucible (23) is arranged on lower bell (17)；Across high-temperature fusion furnace sidewall, in difference Height is provided with 6 Wolfram rhenium heat electric couples (20), the temperature for measuring fuel rod (25).

4. a kind of nuclear reactor fuel rod according to claim 2 melts visual experimental apparatus, which is characterized in that high temperature 6 saturating windows (19), 6 saturating windowsill sidewall of the furnace body spiral escalation arrangements, in week are offered on the sidewall of the furnace body (18) of melting furnace It is uniformly distributed upwards.

5. a kind of nuclear reactor fuel rod according to claim 4 melts visual experimental apparatus, which is characterized in that adjacent Two saturating windows are 0.16m in the distance of vertical direction；Saturating window is in circular platform type, a diameter of 25mm of the top surface opening of saturating window, bottom A diameter of 74mm of face opening.

6. a kind of nuclear reactor fuel rod according to claim 4 melts visual experimental apparatus, which is characterized in that saturating window Be provided with circular cover in the high-temperature fusion furnace sidewall at place, in circular cover and high-temperature fusion furnace sidewall between be provided with quartzy glass Glass (9) offers circular hole in circular cover.

7. a kind of nuclear reactor fuel rod according to claim 6 melts visual experimental apparatus, which is characterized in that round Cover board is fixed by screws on the side wall of high temperature smelting furnace, and quartz glass is cylindric, between circular cover and quartz glass 9 It is provided with O-ring seal (12), rectangular seal (10) is provided on the side wall of quartz glass (9).

8. a kind of nuclear reactor fuel rod according to claim 7 melts visual experimental apparatus, which is characterized in that quartz A diameter of 40mm of glass.

9. a kind of nuclear reactor fuel rod according to claim 2 melts visual experimental apparatus, which is characterized in that cooling Water circulation system includes water tank (30), is provided with pipeline on upper bell (16), pipeline is provided on high-temperature fusion sidewall of the furnace body, under Pipeline is provided on bell (17), copper electrode is provided with pipeline on (21)；Water tank (30) outlet is connected with water pump (26) entrance, water Pump (26) outlet is connected with No. five water knockout drums (31), No. five water knockout drums (31) export respectively on upper bell entrance, Entrance on high-temperature fusion sidewall of the furnace body, the entrance on lower bell (17), the entrance on copper electrode (21) with And lobe pump (2) entrance is connected, the pipe outlet on upper bell (16), the pipe outlet on high-temperature fusion sidewall of the furnace body, lower stove Cover (17) on pipe outlet, the pipe outlet on copper electrode (21) and lobe pump (2) outlet with water collector (32) entrance It is connected, water collector (32) outlet is connected with water tank (30) entrance；Water-level gauge (29), water tank (30) top are provided in water tank (30) It is provided with cooling tower (28), elevator pump (27) is provided in water tank (30), elevator pump (27) outlet is connected with cooling tower (28).

10. a kind of experimental method based on the device described in claim 9, which is characterized in that open feed pump (26) and promoted It pumps (27), feed pump (26) is located at water tank (30) external Bing Yu No. five water knockout drums (31) and is connected, by the cooling water in water tank (30) Flow to corresponding experimental facilities after Song Zhi No. five water knockout drums (31) respectively, cooling water cooling, which corresponds to converge to after experimental facilities, catchments In device (32), water collector (32) is connected with water tank (30), the final reflow tank of cooling water (30)；Elevator pump is located at water tank bottom, Water in water tank is promoted to the cooling tower of eminence, cooling water is flow back into after air cooling in water tank (30)；Then to height Vacuumized in warm melting furnace, when in high temperature smelting furnace vacuum degree reach setting value after be passed through argon gas, argon gas is passed through supreme from furnace bottom Until high-temperature fusion furnace pressure reaches 1.2MPa in warm melting furnace, alternating current passes through water cooling copper electrode (12) and rhenium molybdenum electrode (22), W-Re heating rod (24) is flowed into be electrically heated fuel rod (25)；High-speed camera instrument penetrates the saturating window captured in real-time in furnace wall The fusing of stove internal combustion charge bar and migrating tendency process simultaneously preserve, and Wolfram rhenium heat electric couple (20) measures the temperature of fuel rod outer surface zirconium -4 alloy It spends and preserves.