Suction system and suction method for spherical fuel element of high-temperature gas cooled reactor

Abstract

The invention relates to the technical field of nuclear power stations, in particular to a high-temperature gas cooled reactor spherical fuel element suction system and method. A high-temperature gas cooled reactor spherical fuel element suction system comprises a spent fuel loading device, the spent fuel loading device is provided with a feeding pipeline, a suction tee joint and a discharging pipeline, a spherical fuel element can enter the feeding pipeline, the suction tee joint is communicated with the feeding pipeline and the discharging pipeline, the suction tee joint is provided with a suction opening, and the discharging pipeline is communicated with the discharging pipeline. The unloading pipeline is suitable for being communicated with a spent fuel storage tank; the negative pressure suction device comprises a suction hose, and the suction hose enters the discharging pipeline through the suction opening. The problems that after all fuel elements in a reactor core are emptied, when spherical fuel elements with the fuel consumption depth not reaching the limit value in a spent fuel storage tank need to be returned to the reactor core, the spherical fuel elements with the fuel consumption depth not reaching the limit value often need to be sucked after a charging device is separated from the spent fuel storage tank, and the whole process is complex and long in consumed time are solved.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plants, and in particular to a high-temperature gas-cooled reactor spherical fuel element suction system and a suction method. Background Art

[0002] After being unloaded from the core, the HTR-PM high temperature gas-cooled reactor spherical fuel elements (spent fuel elements, graphite spherical elements, and fuel elements whose burnup depth has not reached the limit) are lifted once by a helium compressor through the fuel loading and unloading system unloading device, the spherical ball separation device, the burnup measurement positioning distributor and other conveying and conversion devices, and the spherical fuel elements are temporarily stored in the unloading temporary storage device; then, the spent fuel storage system negative pressure Roots blower is used for a second lifting, and the spherical fuel elements are lifted from the loading and unloading buffer pipeline room (-11m) to the top of the spent fuel loading room (+21m) of the spent fuel plant.

[0003] After the secondary lifting, the spherical fuel elements fall into the spent fuel loading device by gravity. At this time, the discharge pipe mouth of the spent fuel loading device has been connected with the tank mouth of the storage tank in the shielding cover of the ground vehicle. The spherical fuel elements enter the spent fuel storage tank through the spent fuel loading device. At this time, another prerequisite is that the cover of the spent fuel storage tank has been lifted to the upper position inside the discharge pipe of the loading device, and the tank mouth is open. However, when the reactor core is emptied of all fuel elements, the spherical fuel elements in the spent fuel storage tank whose fuel consumption depth does not reach the limit need to be returned to the core. It is often necessary to separate the loading device from the spent fuel storage tank, and then pump out the spherical fuel elements that have not reached the limit. The whole process is relatively complicated and time-consuming. Summary of the invention

[0004] In view of this, the present invention provides a spherical fuel element suction system and suction method for a high-temperature gas-cooled reactor to solve the problem that when all fuel elements are emptied from the reactor core, the spherical fuel elements whose burnup depth does not reach the limit in the spent fuel tank need to be returned to the core. It is often necessary to separate the loading device from the spent fuel tank and then suction the spherical fuel elements that have not reached the limit, and the whole process is relatively complicated and time-consuming.

[0005] In a first aspect, the present invention provides a high temperature gas-cooled reactor spherical fuel element suction system, comprising:

[0006] A spent fuel loading device, the spent fuel loading device comprising a feed pipe, a suction tee and a discharge pipe, the feed pipe is suitable for entering the spherical fuel element, the suction tee is respectively connected with the feed pipe and the discharge pipe, the suction tee has a suction port, and the discharge pipe is suitable for communicating with the spent fuel storage tank;

[0007] A negative pressure suction device comprises a suction hose, and the suction hose enters into the discharge pipe through a suction port.

[0008] When a large number of spherical fuel elements in the spent fuel tank need to be sucked out, the suction hose enters the discharge pipe through the suction port of the suction tee, and then enters the spent fuel tank through the discharge pipe to suck out the spherical fuel elements in the spent fuel tank, so as to achieve a rapid and continuous suction effect for a large number of spherical fuel elements. During the whole process, there is no need to separate the spent fuel loading device from the spent fuel tank, and the spherical fuel elements that do not reach the limit can be sucked out, which simplifies the suction steps and reduces the entire time.

[0009] In an optional embodiment, the spent fuel loading device also includes a fixed frame, which is used to fix the feed pipe. A pair of clamps extend from the side of the fixed frame, and a discharge pipe is accommodated between the pair of clamps. The bottom of the clamp is fixedly connected to the suction tee.

[0010] In an optional embodiment, the negative pressure suction device includes a rotating wheel, a side surface of which is fixedly connected to a fixed frame, an outer peripheral surface of the rotating wheel is provided with a receiving groove, and the suction hose is partially wound in the receiving groove.

[0011] In an optional embodiment, a stainless steel hose is further wound around the rotating wheel, one end of the stainless steel hose is fixedly connected to the suction hose, and the other end of the stainless steel hose is fixedly connected to the center of the rotating wheel.

[0012] In an optional embodiment, one end of the suction hose facing away from the stainless steel hose is fixedly connected to the suction nozzle, and a transition connector is provided between the suction nozzle and the suction hose.

[0013] In an optional embodiment, the suction nozzle is a cylindrical nozzle or a wedge-shaped nozzle.

[0014] In an optional embodiment, the negative pressure suction device also includes a guide frame, which is arranged on the side of the discharge pipe, the guide frame is fixedly connected to the fixed frame, and a guide roller is provided on the guide frame, and the outer peripheral surface of the guide roller is in contact with the suction hose.

[0015] In an optional embodiment, it also includes a ball passing pipe and a ball transport pipe, the ball passing pipe is fixedly connected to the center of the rotating wheel, the ball passing pipe and the stainless steel hose are respectively arranged on both sides of the rotating wheel, and the ball passing pipe is connected to the ball transport pipe.

[0016] In an optional embodiment, a gas diverter is also included, and the gas diverter is connected to the ball transport pipeline.

[0017] In a second aspect, the present invention also provides a suction method for a spherical fuel element suction system of a high temperature gas-cooled reactor, wherein a suction hose enters a discharge pipe through a suction port, and the suction hose is used to extract the spherical fuel elements in the spent fuel storage tank out of the spent fuel storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a suction system for a spherical fuel element of a high temperature gas-cooled reactor according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic structural diagram of a spent fuel loading device according to an embodiment of the present invention;

[0021] Figure 3 This is a structural schematic diagram of the connection between a spent fuel loading device and a fixed frame according to an embodiment of the present invention;

[0022] Figure 4 It is a schematic structural diagram of a suction hose, a connecting transition head and a wedge-shaped nozzle according to an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a cylindrical nozzle according to an embodiment of the present invention;

[0024] Figure 6 The figure is a schematic structural diagram of a spent fuel storage tank according to an embodiment of the present invention.

[0025] Explanation of the reference numerals: 1. spent fuel storage tank; 101. ball flow inlet; 2. spent fuel loading device; 201. feed pipe; 202. discharge pipe; 203. suction tee; 2031. suction port; 3. negative pressure suction device; 301. rotor; 3011. center portion; 3012. receiving tank; 302. guide frame; 3021. guide roller; 303. suction hose; 304. stainless steel hose; 305. wedge-shaped nozzle; 306. transition connector; 307. cylindrical nozzle; 4. gas diverter; 5. counter; 6. ball stopper; 7. first valve; 8. buffer; 9. element collection tank; 10. second valve; 11. filter; 12. negative pressure unit; 13. third valve; 14. spherical fuel element direction pipeline; 15. air flow direction pipeline. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0028] According to an embodiment of the present invention, on the one hand, a high temperature gas-cooled reactor spherical fuel element suction system is provided, comprising:

[0029] The spent fuel loading device 2 comprises a feed pipe 201, a suction tee 203 and a discharge pipe 202. The feed pipe 201 is suitable for entering the spherical fuel element. The suction tee 203 is respectively connected with the feed pipe 201 and the discharge pipe 202. The suction tee 203 has a suction port 2031. The discharge pipe 202 is suitable for being connected with the spent fuel storage tank 1.

[0030] The negative pressure suction device 3 includes a suction hose 303 , and the suction hose 303 enters the discharge pipe 202 through the suction port 2031 .

[0031] When a large number of spherical fuel elements in the spent fuel storage tank 1 need to be sucked, the spherical fuel elements in the spent fuel storage tank 1 are sucked through the suction hose 303 and the suction port 2031 of the suction tee 203, and then enter the spent fuel storage tank 1 through the discharge pipe 202 to suck the spherical fuel elements in the spent fuel storage tank 1, so as to achieve a rapid and continuous suction effect for a large number of spherical fuel elements. In the whole process, there is no need to separate the spent fuel loading device 2 from the spent fuel storage tank 1, and the spherical fuel elements that have not reached the limit can be sucked, which simplifies the suction steps and reduces the entire time.

[0032] In addition, when the unloading pipe 202 reaches above the spent fuel tank 1 and does not enter the spent fuel tank 1, the tank cover of the spent fuel tank 1 is not opened normally due to equipment problems in the spent fuel tank 1, and the lifted spherical fuel elements can easily fall directly to the top of the tank cover, or when they accumulate to a certain height in the unloading pipe 202, the suction hose 303 is extended into the suction tee 203 to suck the spherical fuel elements through the cooperation of the suction tee 203 and the suction hose 303 provided in the present application, so as to remove the accumulated spherical fuel elements.

[0033] like Figure 2 , Figure 3As shown, in one embodiment, the spent fuel loading device 2 further includes a fixed frame, the fixed frame is used to fix the feed pipe 201, a pair of clamps are extended from the side of the fixed frame, the discharge pipe 202 is accommodated between the pair of clamps, and the bottom of the clamps is fixedly connected to the suction tee 203. By providing a pair of clamps to accommodate the discharge pipe 202, and then fixing the suction tee 203 by the clamps, the discharge pipe 202 and the suction tee 203 are fixedly arranged.

[0034] like Figure 3 As shown, in one embodiment, the negative pressure suction device 3 includes a rotor 301, the side of the rotor 301 is fixedly connected to the fixed frame, and a receiving groove 3012 is provided on the outer circumference of the rotor 301, and the suction hose 303 is partially wound in the receiving groove 3012. The receiving groove 3012 is provided so that the suction hose 303 is wound around the receiving groove 3012, and the rotation of the rotor 301 facilitates the length of the suction hose 303 to cover the plate. In this embodiment, the negative pressure suction device 3 is also provided with a power member, which drives the rotor 301 to rotate. It should be noted that the spent fuel storage tank 1 of the present application is provided with a ball flow inlet 101, and the ball flow inlet 101 is connected to the discharge pipe 202, so that the spherical fuel element enters the spent fuel storage tank 1 through the discharge pipe 202.

[0035] like Figure 3 As shown, in one embodiment, a stainless steel hose 304 is also wound around the rotating wheel 301, one end of the stainless steel hose 304 is fixedly connected to the suction hose 303, and the other end of the stainless steel hose 304 is fixedly connected to the central part 3011 of the rotating wheel 301. The stainless steel hose 304 provides strength support for the suction hose 303 and can also communicate with the central part 3011 of the rotating wheel 301. It should be noted that the central part 3011 of the rotating wheel 301 in the present application is hollow.

[0036] like Figure 3 As shown, in one embodiment, one end of the suction hose 303 away from the stainless steel hose 304 is fixedly connected to the suction nozzle, and a transition connector 306 is provided between the suction nozzle and the suction hose 303. The suction nozzle is connected to the suction hose 303, and the transition connector 306 realizes the connection between the suction nozzle and the suction hose 303.

[0037] like Figure 4 , Figure 5 As shown, in one embodiment, the suction nozzle is a cylindrical nozzle 307 or a wedge-shaped nozzle 305. The nozzles of different shapes can adapt to different suction conditions. In the present application, one end of the transition connector 306 is fixedly connected to the suction hose 303, and the other end is detachably connected to the wedge-shaped nozzle 305 or the cylindrical nozzle 307 by means of threading, plugging, etc.

[0038] like Figure 3 As shown, in one embodiment, the negative pressure suction device 3 further includes a guide frame 302, which is arranged on the side of the discharge pipe 202, and is fixedly connected to the fixed frame. A guide roller 3021 is arranged on the guide frame 302, and the outer peripheral surface of the guide roller 3021 is in contact with the suction hose 303. By providing the guide roller 3021, it is convenient for the suction hose 303 to enter the suction port 2031 along the guide roller 3021.

[0039] In one embodiment, it further includes a ball passing pipe and a ball transporting pipe, the ball passing pipe is fixedly connected to the central part 3011 of the runner 301, the ball passing pipe and the stainless steel hose 304 are respectively arranged on both sides of the runner 301, and the ball passing pipe is connected to the ball transporting pipe. In this embodiment, the central part 3011 of the runner 301 is hollow, so that the spherical fuel elements can reach the ball passing pipe from the stainless steel hose 304 along the central part 3011. The spherical fuel elements extracted by the suction hose 303 reach the central part 3011 of the runner 301 through the stainless steel hose 304, and then enter the ball passing pipe from the central part 3011, and enter the ball transporting pipe from the ball passing pipe.

[0040] like Figure 1 As shown, in one embodiment, a gas diverter 4 is also included, and the gas diverter 4 is connected to the ball conveying pipeline. The gas diverter 4 separates the spherical fuel elements from the gas.

[0041] like Figure 1 As shown, in one embodiment, it also includes a spent fuel storage tank 1, and the gas diverter 4 is connected to a spherical fuel element direction pipeline 14 and an air flow direction pipeline 15, wherein the spherical fuel element direction pipeline 14 is provided with a counter 5, a ball stopper 6, a first valve 7, a buffer 8 and an element collection tank 9 in sequence along the direction away from the gas diverter 4, and the air flow direction pipeline 15 is provided with a second valve 10, a filter 11, a negative pressure unit 12 and a third valve 13 in sequence along the direction away from the gas diverter 4.

[0042] A method for extracting a spherical fuel element of a high temperature gas-cooled reactor comprises the following steps:

[0043] 1) The spherical fuel elements enter the spent fuel storage tank 1 through the feed pipe 201, the suction tee 203 and the discharge pipe 202. When a large number of spherical fuel elements in the spent fuel storage tank 1 need to be sucked, the suction hose 303 is fixedly connected to the cylindrical nozzle 307 through the transition connector 306;

[0044] 2) The power member drives the wheel 301 to rotate, and the cylindrical nozzle 307 and the suction hose 303 enter the suction port 2031 through the guide roller 3021, and enter the spent fuel storage tank 1 from the suction port 2031 through the discharge pipe 202;

[0045] 3) Open the negative pressure unit 12, the second valve 10 and the third valve 13. The negative pressure unit 12 provides suction power, and the spherical fuel element is sucked into the suction hose 303, and then enters the gas diverter 4 through the suction hose 303 through the stainless steel hose 304, the center 3011 of the runner 301, the ball passing pipeline and the ball delivery pipeline;

[0046] 4) The gas diverter 4 separates the gas and the spherical fuel element, and the separated gas passes through the second valve 10, the filter 11, the negative pressure unit 12 and the third valve 13 in the gas flow path 15 in sequence, and then the gas is discharged into the air;

[0047] 5) The separated spherical fuel elements pass through the counter 5, the ball stopper 6, the first valve 7, the buffer 8 in the spherical fuel element pipeline 14 in sequence, and finally enter the element collection tank 9 or enter the downstream system to return to the core.

[0048] It should be noted that the wedge-shaped nozzle 305 is used when sucking a small amount of spherical fuel elements on the cover of the spent fuel storage tank 1, and the rest of the process is the same as the above steps.

[0049] The high-temperature gas-cooled reactor spherical fuel element suction system provided by the present application has the following advantages: (1) a suction tee 203 is provided to solve the existing problem that when the reactor core is emptied of all fuel elements, the spherical fuel elements whose burnup depth has not reached the limit need to be returned to the core of the spent fuel storage tank 1, and the spherical fuel elements that have not reached the limit need to be suctioned after the loading device is separated from the spent fuel storage tank 1; (2) a negative pressure suction device 3 is added to realize the negative pressure suction function, and the power provided by the negative pressure unit 12 is used as the negative pressure suction gas source to realize the negative pressure suction of the spherical fuel elements; (3) different nozzles are used according to different working conditions. When a small number of spherical fuel elements on the tank cover of the spent fuel storage tank 1 are sucked, the wedge nozzle 305 is used to suck the spent fuel tank 1. (4) an air flow path 15 is provided, and the negative pressure unit 12 provides negative pressure suction power, so that after the spherical fuel elements are sucked, the diverted gas can flow out into the atmosphere along the negative pressure unit 12, wherein the air flow will filter impurities through the filter 11 to ensure that it meets the air emission requirements; (5) a spherical fuel element path 14 is provided, and when a small number of spherical fuel elements above the tank cover of the spent fuel storage tank 1 are extracted, the small number of spherical fuel elements above the tank cover are collected through the element collection tank 9; when a large number of spherical fuel elements in the spent fuel storage tank 1 are sucked, the spherical fuel element path 14 is connected to the downstream system pipeline to directly send the spherical fuel elements to the downstream system and then return to the core.

[0050] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A high temperature gas-cooled reactor spherical fuel element suction system, characterized in that: include: A spent fuel loading device (2), the spent fuel loading device (2) comprising a feed pipe (201), a suction tee (203) and a discharge pipe (202), the feed pipe (201) being suitable for the spherical fuel element to enter, the suction tee (203) being respectively connected to the feed pipe (201) and the discharge pipe (202), the suction tee (203) having a suction port (2031), and the discharge pipe (202) being suitable for being connected to a spent fuel storage tank (1); A negative pressure suction device (3), the negative pressure suction device (3) comprising a suction hose (303), the suction hose (303) entering into a discharge pipe (202) through a suction port (2031).

2. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 1, characterized in that: The spent fuel loading device (2) also includes a fixed frame, the fixed frame is used to fix the feed pipe (201), a pair of clamps extend from the side of the fixed frame, a discharge pipe (202) is accommodated between the pair of clamps, and the bottom of the clamp is fixedly connected to the suction tee (203).

3. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 2, characterized in that: The negative pressure suction device (3) comprises a rotating wheel (301), the side surface of the rotating wheel (301) is fixedly connected to a fixed frame, a receiving groove (3012) is provided on the outer peripheral surface of the rotating wheel (301), and the suction hose (303) is partially wound in the receiving groove (3012).

4. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 3, characterized in that: A stainless steel hose (304) is also wound around the rotating wheel (301), one end of the stainless steel hose (304) is fixedly connected to the suction hose (303), and the other end of the stainless steel hose (304) is fixedly connected to the central part (3011) of the rotating wheel (301).

5. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 4, characterized in that: One end of the suction hose (303) facing away from the stainless steel hose (304) is fixedly connected to the suction nozzle, and a transition connector (306) is provided between the suction nozzle and the suction hose (303).

6. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 5, characterized in that: The suction nozzle is a cylindrical nozzle (307) or a wedge-shaped nozzle (305).

7. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 5, characterized in that: The negative pressure suction device (3) further comprises a guide frame (302), wherein the guide frame (302) is arranged on the side of the discharge pipe (202), the guide frame (302) is fixedly connected to the fixed frame, and a guide roller (3021) is arranged on the guide frame (302), and the outer peripheral surface of the guide roller (3021) is in contact with the suction hose (303).

8. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 4, characterized in that: It also includes a ball passing pipe and a ball transporting pipe, wherein the ball passing pipe is fixedly connected to the central portion (3011) of the rotating wheel (301), the ball passing pipe and the stainless steel hose (304) are respectively arranged on both sides of the rotating wheel (301), and the ball passing pipe is connected to the ball transporting pipe.

9. The high temperature gas-cooled reactor spherical fuel element suction system according to claim 8, characterized in that: It also comprises a gas diverter (4), wherein the gas diverter (4) is connected to the ball conveying pipeline.

10. A method for pumping a spherical fuel element pumping system for a high temperature gas-cooled reactor, used for using the pumping system for the spherical fuel element for a high temperature gas-cooled reactor according to claim 1, characterized in that: The suction hose (303) enters the discharge pipe (202) through the suction port (2031), and the suction hose (303) is used to extract the spherical fuel elements in the spent fuel storage tank (1) to the outside of the spent fuel storage tank (1).

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