High-temperature gas cooled reactor system

Abstract

The invention relates to the technical field of nuclear reactors, and provides a high-temperature gas cooled reactor system. The system comprises: a reactor; the combined converter is connected to an inlet of the reactor; the burnup measuring device is connected to an outlet of the reactor; the sipping analysis device is connected between the burnup measuring device and the combined converter, a detection cavity is formed in the sipping analysis device, and the sipping analysis device is used for receiving the fuel balls from the burnup measuring device and can establish a negative pressure environment in the detection cavity so as to detect the activity value of target radionuclide in the gas in the detection cavity; the control module is electrically connected with the combined converter, the burn-up measuring device and the sipping analysis device; when the burnup value is smaller than a set burnup threshold value and the activity value is smaller than an activity constraint value, the control module controls the combined converter to return the fuel balls to the reactor for recycling; when the burnup value is larger than or equal to a set burnup threshold value or the activity value is larger than or equal to an activity constraint value, the control module controls the combined converter to unload the fuel balls.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear reactors, in particular to a high-temperature gas-cooled reactor system. BACKGROUND

[0002] The pebble bed type high-temperature gas-cooled reactor adopts a continuous online fuel replacement technology, that is, after the fuel balls are circulated in the reactor to reach a design burnup depth, the fuel balls are unloaded from the bottom of the reactor core, enter a burnup measurement device through a pneumatic conveying system, the burnup measurement device measures the burnup value of the fuel balls, if the burnup value is less than a target threshold value, the fuel balls are returned to the reactor core for recycling, and if the burnup value is greater than or equal to the target threshold value, the fuel balls are unloaded from the system of the pebble bed type high-temperature gas-cooled reactor.

[0003] However, after the fuel balls are subjected to high-temperature irradiation in the reactor, the coated fuel particles may be damaged and radioactive particles may be leaked, the existing system cannot identify the damaged fuel balls through the burnup measurement device, if the damaged fuel balls are sent into the reactor core for recycling again, the damage degree of the fuel balls will be accelerated, until the fuel balls are stranded in the reactor core and cannot be unloaded, and the radioactivity of the loop of the high-temperature gas-cooled reactor will continue to increase, affecting the safe and stable operation of the high-temperature gas-cooled reactor. SUMMARY

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a high-temperature gas-cooled reactor system.

[0005] The present application provides a high-temperature gas-cooled reactor system, comprising:

[0006] a reactor;

[0007] a combined converter connected to an inlet of the reactor;

[0008] a burnup measurement device connected to an outlet of the reactor, for detecting a burnup value of the fuel balls;

[0009] a sip analysis device connected between the burnup measurement device and the combined converter, the sip analysis device is provided with a detection cavity for receiving the fuel balls from the burnup measurement device, and a negative pressure environment can be established in the detection cavity to detect an activity value of a target radionuclide in the gas in the detection cavity;

[0010] a control module electrically connected with the combined converter, the burnup measurement device and the sip analysis device;

[0011] when the burnup value is less than a set burnup threshold value and the activity value is less than an activity constraint value, the control module controls the combined converter to return the fuel balls to the reactor for recycling;

[0012] When the burnup value is greater than or equal to the set burnup threshold value or the activity value is greater than or equal to the activity constraint value, the control module controls the combined converter to unload the fuel ball.

[0013] Optionally, the sip analysis device comprises:

[0014] A detection pipe, which is in communication with the burnup measuring device and the combined converter at two ends and is provided with an air inlet channel and an air outlet channel;

[0015] An upstream valve and a downstream valve, which are installed in the detection pipe in a spaced manner along the moving direction of the fuel ball and are electrically connected to the control module so that the control module controls the opening and closing of the upstream valve and the downstream valve, the upstream valve is arranged on the side of the downstream valve close to the reactor, and the air inlet channel and the air outlet channel are located between the upstream valve and the downstream valve;

[0016] A detection module, which is in communication with the air inlet channel and the air outlet channel;

[0017] A blowing device, which is fixed to the inner wall of the detection pipe and adjacent to the upstream valve to drive the fuel ball to leave the detection cavity;

[0018] When the upstream valve and the downstream valve are closed, the detection pipe forms a sealed detection cavity, the detection module injects air into the detection cavity through the air inlet channel and extracts air through the air outlet channel to establish a negative pressure environment, and the detection module detects the activity value of the target radionuclide in the extracted air.

[0019] Optionally, when the fuel ball enters the detection cavity, the control module controls the upstream valve to open and the downstream valve to close; when the detection module detects the activity value, the control module controls the upstream valve and the downstream valve to close; and when the fuel ball leaves the detection cavity, the control module controls the upstream valve to close and the downstream valve to open.

[0020] Optionally, the control module comprises a controller and a first detector, a second detector, a third detector and a fourth detector arranged in sequence along the moving direction of the fuel ball;

[0021] The first detector and the second detector are arranged on the two sides of the upstream valve, the third detector and the fourth detector are arranged on the two sides of the downstream valve, the second detector and the third detector are arranged in a spaced manner, and the detection module detects the activity value when the fuel ball is located between the second detector and the third detector.

[0022] When the fuel ball triggers the first detector, the controller controls the upstream valve to open; when the fuel ball triggers the second detector, the controller controls the upstream valve to close; when the fuel ball triggers the third detector, the controller controls the downstream valve to open; when the fuel ball triggers the fourth detector, the controller controls the downstream valve to close.

[0023] Optionally, the detection module comprises:

[0024] A gas circuit, which is in communication with the gas inlet channel and the gas outlet channel, to inject gas into the detection cavity and to extract gas from the detection cavity;

[0025] A nuclide detection device, which is connected to the gas circuit and arranged downstream of the gas outlet channel, to detect the activity value of the target radionuclide contained in the gas discharged from the gas outlet channel;

[0026] A data analysis device, which is electrically connected to the nuclide detection device and the control module, receives the detection data of the nuclide detection device and compares and analyzes the activity constraint value, to send a control signal to the control module, and the control module controls the combined converter to return or discharge the fuel ball according to the control signal.

[0027] Optionally, the sip analysis device further comprises a filter collection module, the gas circuit comprises a purge pipeline, the filter collection module is connected to the purge pipeline, the purge pipeline is connected to the detection tube, the purge pipeline blows inert gas into the detection tube at a set pressure, and the filter collection module collects the inert gas flowing through the detection cavity.

[0028] Optionally, the gas inlet channel is arranged at the bottom side of the gas outlet channel, and a support net is arranged in the gas inlet channel, which is used to support the fuel ball in the detection cavity.

[0029] Optionally, a gas branch is arranged on the detection tube, both ends of the gas branch are in communication with the detection tube, one end of the gas branch is arranged on the side of the upstream valve away from the downstream valve, and the other end is arranged on the side of the downstream valve away from the upstream valve.

[0030] Optionally, a blow blocking device is arranged in the detection tube, the blow blocking device is arranged on the side of the upstream valve away from the downstream valve, and the blow blocking device can blow gas in the direction away from the upstream valve to slow down the moving speed of the fuel ball entering the detection tube.

[0031] Optionally, the combined converter comprises a sorting mechanism, which guides the fuel ball to the inlet of the reactor or discharges it according to the instruction of the control module.

[0032] The technical scheme provided by the application has the following advantages compared with the prior art:

[0033] The high-temperature gas cooled reactor system provided by the application installs the sip analysis device between the combined converter and the burnup measurement device, so that the fuel balls discharged from the reactor first pass through the burnup measurement device to measure the burnup, then pass through the sip analysis device to detect whether leakage occurs, and finally, under the cooperation of the control module and the combined converter, the fuel balls that do not leak can continue to react and return to the reactor for recycling, the fuel balls that have a large burnup degree and cannot continue to react or have leakage can be unloaded in time without returning to the reactor, thereby avoiding the recycling of the fuel balls that have leakage; the high-temperature gas cooled reactor system can identify the fuel balls that have leakage and unload the fuel balls that have leakage from the system, thereby avoiding the influence of the fuel balls that have leakage on the normal operation of the high-temperature gas cooled reactor system and ensuring the safe and stable operation of the high-temperature gas cooled reactor. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0035] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the accompanying drawings required to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other accompanying drawings can also be obtained by those skilled in the art without any creative labor.

[0036] Figure 1 A schematic diagram of the high-temperature gas cooled reactor system described in the embodiments of the application;

[0037] Figure 2 A schematic diagram of the sip analysis device described in the embodiments of the application.

[0038] 1, reactor; 11, fuel ball; 2, combined converter; 3, burnup measurement device; 4, sip analysis device; 41, detection tube; 42, upstream valve; 43, downstream valve; 44, detection chamber; 441, air inlet channel; 442, air outlet channel; 443, support net; 45, blowing device; 46, blow-off device; 47, gas branch; 51, first detector; 52, second detector; 53, third detector; 54, fourth detector. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the application, the scheme of the application will be further described below. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0040] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present application.

[0041] Referring to Figure 1 and Figure 2 , the embodiment of the present application provides a high temperature gas cooled reactor system, comprising a reactor 1, a combined converter 2, a burnup measuring device 3, a sip analysis device 4 and a control module; the combined converter 2 is connected to the inlet of the reactor 1; the burnup measuring device 3 is connected to the outlet of the reactor 1, for detecting the burnup value of the fuel ball 11; the sip analysis device 4 is connected between the burnup measuring device 3 and the combined converter 2, and the sip analysis device 4 is provided with a detection cavity 44 for receiving the fuel ball 11 from the burnup measuring device 3, and can establish a negative pressure environment in the detection cavity 44 to detect the activity value of the target radionuclide in the gas in the detection cavity 44; the control module is electrically connected with the combined converter 2, the burnup measuring device 3 and the sip analysis device 4; when the burnup value is less than a set burnup threshold value, and the activity value is less than an activity constraint value, the control module controls the combined converter 2 to return the fuel ball 11 to the reactor 1 for recycling; when the burnup value is greater than or equal to the set burnup threshold value, or the activity value is greater than or equal to the activity constraint value, the control module controls the combined converter 2 to unload the fuel ball 11.

[0042] Specifically, the reactor 1 comprises a cylindrical pressure vessel and a circulating loop, the circulating loop is filled with inert gas as coolant, the pressure vessel contains fuel balls 11, and the fuel balls 11 perform nuclear fission reaction in the pressure vessel.

[0043] The fuel ball 11 is a graphite ball, each fuel ball 11 contains a large number of tiny fuel particles in the inside, the fuel particles have a fuel core of central uranium oxide or uranium carbide, and the fuel core is tightly wrapped by a plurality of ceramic coating layers. A plurality of fuel balls 11 are stacked in the pressure vessel, and gaps for gas flow are left between adjacent fuel balls. Helium gas is driven by a circulating fan or compressor, enters from the top or bottom of the reactor pressure vessel, flows through the gaps between the fuel balls, absorbs the heat generated by nuclear fission, becomes high-temperature gas, and then flows out from the outlet on the other side of the pressure vessel. The inert gas in the circulating loop is heated to a high temperature and then leaves the core to enter a steam generator, or the high-temperature inert gas is introduced into a helium turbine to drive a generator to generate electricity.

[0044] The fuel balls 11 of the traditional pebble bed type high temperature gas cooled reactor can be continuously loaded and unloaded. The fuel balls 11 are added from the top of the reactor 1. As the operation proceeds, the fuel balls 11 gradually move to the bottom of the reactor 1 by gravity. At the bottom of the reactor 1, the fuel balls 11 are taken out and, by measuring the burnup consumption degree, it is determined whether to return to the top of the reactor for reuse or to be unloaded as spent fuel. A fuel ball usually circulates in the reactor for multiple times and is unloaded after reaching the designed burnup.

[0045] The top of the reactor 1 is connected with the combined converter 2, the bottom is connected with the burnup measuring device 3, and the sipper analysis device 4 is connected between the burnup measuring device 3 and the combined converter 2. The fuel balls 11 are discharged from the reactor 1 into the burnup measuring device 3, and after the burnup measurement of the fuel balls 11 in the burnup measuring device 3, the fuel balls 11 are discharged into the detection cavity 44 of the sipper analysis device 4, so that the sipper analysis device 4 detects the fuel balls 11 in a negative pressure environment. If the fuel balls 11 leak, the activity value of the target radionuclide in the gas extracted by the sipper analysis device 4 will be greater than or equal to the preset threshold value. The fuel balls 11 in the sipper analysis device 4 are discharged and then moved to the combined converter 2.

[0046] The burnup measuring device 3 usually collects the characteristic gamma rays emitted by the fuel balls 11 using gamma energy spectrum, analyzes the gamma energy spectrum in real time through a signal processing system, identifies the characteristic peaks of the preset fission products, calculates the peak area and substitutes it into the burnup-radioactivity calibration curve to output the burnup value. The detected burnup value is compared with the set threshold value to ensure whether the fuel balls 11 can continue to react in the reactor 1.

[0047] The control combined converter 2 has two channels, one channel is connected with the reactor 1 as a circulating channel, and the other channel is connected with a spent fuel tank as a discharge channel. The spent fuel tank is arranged outside the reactor 1 and is not connected with the reactor 1. After the control module completes the judgment, when it is necessary to return the fuel balls 11 to the reactor 1, the fuel balls 11 are driven to enter the circulating channel; when it is necessary to unload the fuel balls 11, the fuel balls 11 are driven to enter the spent fuel tank through the discharge channel, so that the fuel balls 11 will not return to the reactor 1 for reaction.

[0048] The sipper analysis device 4 described above can optionally include a detection tube, the two ends of the detection tube are respectively communicated with the burnup measuring device 3 and the combined converter 2, two valves can be optionally arranged on the detection tube. When the fuel balls 11 pass through the detection tube, the two valves are closed when the fuel balls 11 are between the two valves, so as to form a sealed cavity in the detection tube. Then the sipper analysis device 4 extracts the gas in the cavity, and detects the activity value of the target radionuclide in the gas in the cavity. If the fuel balls 11 leak, the detected activity value will be greater than or equal to the preset threshold value.

[0049] The control module can be a chip or a microcomputer. The detection value of the fuel burn measurement device 3 is transmitted to the control module, and the detection value of the sipping analysis device 4 is transmitted to the control module. The control module compares the fuel burn value detected by the fuel burn measurement device 3 with the set fuel burn threshold value, and compares the activity value with the set activity constraint value, so as to determine whether the fuel ball 11 can continue to react in the reactor 1 and whether the fuel ball 11 leaks. Only when the fuel ball 11 can continue to react and does not leak, the fuel ball 11 can return to the reactor 1 for recycling; when the fuel ball 11 cannot continue to react due to a large fuel burn value, or the fuel ball 11 leaks, the fuel ball 11 cannot return to the reactor 1, and needs to be unloaded to avoid causing the high-temperature gas cooled reactor system to malfunction.

[0050] Of course, the fuel burn measurement device 3 can compare the detected fuel burn value with the set fuel burn threshold value, and transmit the comparison result to the control module. The sipping analysis device 4 compares the detected activity value with the activity constraint value, and transmits the comparison result to the control module. The control module controls the operation of the combined converter 2 according to the transmission result of the fuel burn measurement device 3 and the transmission result of the sipping analysis device 4, to ensure that only the fuel ball 11 that can continue to react and does not leak returns to the reactor 1.

[0051] The reactor 1 and the combined converter 2 can be connected by a pipe body, the reactor 1 and the fuel burn measurement device 3 are connected by a pipe body, the sipping analysis device 4 and the fuel burn measurement device 3 are connected, and the sipping analysis device 4 and the combined converter 2 are connected by a pipe body. The fuel ball 11 falls into the fuel burn measurement device 3 under the action of its own gravity, and can be driven into the sipping analysis device 4 by air flow, and then the fuel ball 11 is pushed out of the sipping analysis device 4 by air flow and enters the combined converter 2.

[0052] In use, the high-temperature gas cooled reactor system provided by the embodiment of the application places the fuel ball 11 in the reactor 1, and the fuel ball 11 reacts in the reactor 1. The fuel ball 11 is discharged from the reactor 1 under the action of its own gravity and enters the fuel burn measurement device 3. The fuel burn measurement device 3 measures the fuel burn value of the fuel ball 11. Then the fuel ball 11 enters the detection cavity 44, and the sipping analysis device 4 detects the activity value of the target radionuclide in the gas in the detection cavity 44. After the sipping analysis device 4 completes the detection, the fuel ball 11 enters the combined converter 2.

[0053] When the burnup value is less than the set burnup threshold value and the activity value is less than the activity constraint value, the control module controls the combined converter 2 to return the fuel ball 11 to the reactor 1 for recycling; when the burnup value is greater than or equal to the set burnup threshold value or the activity value is greater than or equal to the activity constraint value, the control module controls the combined converter 2 to unload the fuel ball 11, avoiding the fuel ball 11 from entering the reactor 1.

[0054] The high-temperature gas cooled reactor system provided by the embodiment of the present application is provided with the sip analysis device 4 between the combined converter 2 and the burnup measuring device 3, so that the fuel ball 11 discharged from the reactor 1 is first measured for burnup by the burnup measuring device 3, and then detected for leakage by the sip analysis device 4, and finally, under the cooperation of the control module and the combined converter 2, the fuel ball 11 that does not leak can continue to react and return to the reactor 1 for recycling, and the fuel ball 11 that has a large burnup degree and cannot continue to react or has leaked can be unloaded in time without returning to the reactor 1, avoiding the recycling of the fuel ball 11 that has leaked; the high-temperature gas cooled reactor system can identify the fuel ball 11 that has leaked and unload the fuel ball 11 that has leaked from the system, avoiding the influence of the leakage of the fuel ball 11 on the normal operation of the high-temperature gas cooled reactor system, and ensuring the safe and stable operation of the high-temperature gas cooled reactor.

[0055] Referring to Figure 1 and Figure 2 In some embodiments, the sip analysis device 4 includes:

[0056] A detection pipe 41, which is in communication with the burnup measuring device 3 and the combined converter 2 at two ends and is provided with an air inlet channel 441 and an air outlet channel 442;

[0057] An upstream valve 42 and a downstream valve 43, which are installed in the detection pipe 41 in a spaced manner along the moving direction of the fuel ball 11 and are both electrically connected to the control module, so that the control module controls the opening and closing of the upstream valve 42 and the downstream valve 43, the upstream valve 42 is arranged on the side of the downstream valve 43 close to the reactor 1, and the air inlet channel 441 and the air outlet channel 442 are located between the upstream valve 42 and the downstream valve 43;

[0058] A detection module, which is in communication with the air inlet channel 441 and the air outlet channel 442;

[0059] A blowing device 45, which is fixed to the inner wall of the detection pipe 41 and adjacent to the upstream valve 42, for driving the fuel ball 11 to leave the detection cavity 44;

[0060] When the upstream valve 42 and the downstream valve 43 are closed, the detection pipe 41 forms a sealed detection cavity 44, the detection module injects air into the detection cavity 44 through the air inlet channel 441 and extracts air through the air outlet channel 442 to establish a negative pressure environment, and the detection module detects the activity value of the target radionuclide in the extracted air.

[0061] In this way, the detection tube 41 is configured to allow the fuel pellet 11 to roll therein, and the upstream valve 42 and the downstream valve 43 are configured to form the detection chamber 44 in the detection tube 41 when closed, and the upstream valve 42 and the downstream valve 43 are configured to cooperate with each other to allow the fuel pellet 11 to enter and exit the detection chamber 44 smoothly. The detection tube 41 is compact in structure and occupies a small space, and the blowing device 45 is configured to prevent the fuel pellet 11 from being retained in the detection chamber 44. The upstream valve 42 and the downstream valve 43 are configured to physically isolate the detection area, form the sealed detection chamber 44 to establish a negative pressure environment, and prevent cross-contamination.

[0062] Specifically, the detection tube 41 includes a first tube body and a second tube body, which are in communication with each other and arranged in a cross shape. The two ends of the first tube body are respectively in communication with the burnup measurement device 3 and the combined converter 2, so that the fuel pellet 11 can be moved from the burnup measurement device 3 to the combined converter 2 through the first tube body. The two ends of the second tube body form an air inlet passage 441 and an air outlet passage 442, and the detection module is connected to the two ends of the second tube body. The air inlet passage 441 and the air outlet passage 442 can be arranged opposite to each other in the vertical direction or in the horizontal direction. The diameter of the detection tube 41 is greater than the diameter of the fuel pellet 11, so as to ensure that the fuel pellet 11 can roll in the detection tube 41.

[0063] The upstream valve 42 and the downstream valve 43 are arranged in the detection tube 41. The upstream valve 42 and the downstream valve 43 can be pneumatic gate valves or electric gate valves. When the upstream valve 42 and the downstream valve 43 are closed, the gas in the detection tube 41 cannot pass through the upstream valve 42 and the downstream valve 43, so that the space between the upstream valve 42 and the downstream valve 43 in the detection tube 41 forms the detection chamber 44. The detection module can blow inert gas, such as helium, into the detection chamber 44 through the air inlet passage 441 and can exhaust the gas through the air outlet passage 442. When the amount of gas injected by the detection module is less than the amount of gas exhausted, a negative pressure environment is formed in the detection chamber 44. The detection module injects the gas into the detection chamber 44, and the gas flows through the fuel pellet 11. If the fuel pellet 11 is damaged, a large amount of target radionuclide will be carried away by the gas when the gas injected by the detection module exits through the air outlet passage 442. The detection module detects the activity value of the target radionuclide in the exhausted gas to determine whether the fuel pellet 11 is damaged.

[0064] During detection, the fuel pellet 11 is in a state of static or slow motion in the detection chamber 44, and the detection module performs a detection operation on the fuel pellet 11 for a set period of time, i.e., a negative pressure environment is formed in the detection chamber 44 for a set period of time.

[0065] A blowing device 45 is disposed within the detection chamber 44 and is positioned close to the upstream valve 42. The blowing device 45 blows gas towards the downstream valve 43 along the extension direction of the detection tube 41. The blowing device 45 can blow inert gas into the detection chamber 44 to drive the fuel ball 11 to roll. After the detection module completes the detection, the blowing device 45 blows gas into the fuel ball 11 in the detection chamber 44 to cause the fuel ball 11 to begin moving and leave the detection chamber 44.

[0066] The upstream valve 42 and downstream valve 43 can be set to the normally open state. When the fuel ball 11 enters the detection chamber 44, the upstream valve 42 and the downstream valve 43 open. When the fuel ball 11 is inside the detection chamber 44, the upstream valve 42 and the downstream valve 43 close to allow the detection module to perform detection. When the fuel ball 11 leaves the detection chamber, both the upstream valve 42 and the downstream valve 43 open.

[0067] Alternatively, both upstream valve 42 and downstream valve 43 can be configured to be normally closed. When fuel ball 11 enters detection chamber 44, upstream valve 42 opens and downstream valve 43 closes. When fuel ball 11 is inside detection chamber 44, both upstream valve 42 and downstream valve 43 close to allow the detection module to perform detection. When fuel ball 11 leaves detection chamber, upstream valve 42 closes and downstream valve 43 opens.

[0068] Reference Figure 1 and Figure 2 As shown, in some embodiments, when the fuel ball 11 enters the detection chamber 44, the control module controls the upstream valve 42 to open and the downstream valve 43 to close; when the detection module detects the activity value, the control module controls both the upstream valve 42 and the downstream valve 43 to close; when the fuel ball 11 leaves the detection chamber 44, the control module controls the upstream valve 42 to close and the downstream valve 43 to open.

[0069] With this configuration, the control module controls the opening and closing of the upstream valve 42 and the downstream valve 43, which allows the fuel ball 11 to enter and leave the detection chamber 44. Furthermore, when the fuel ball 11 passes through the detection tube 41, it reduces the time for gas exchange between the detection chamber 44 and the outside world, ensuring a stable detection environment and efficient transfer of the fuel ball.

[0070] Specifically, upstream valve 42 and downstream valve 43 are normally closed valves. When the detection chamber 44 is not in use, both upstream valve 42 and downstream valve 43 are closed to prevent gas from the fuel consumption measuring device 3 or the combination converter 2 from flowing into the detection chamber 44. When the fuel ball 11 enters the detection tube 41 and moves toward the detection chamber 44, upstream valve 42 opens, allowing the fuel ball 11 to roll into the detection chamber 44; then upstream valve 42 closes, keeping the detection chamber 44 sealed so that the detection module can perform detection. When the fuel ball 11 is about to leave the detection chamber 44, downstream valve 43 opens, allowing the fuel ball 11 to leave the detection chamber 44, and upstream valve 42 closes to prevent gas from the fuel consumption measuring device 3 from entering the detection chamber 44.

[0071] When the fuel ball 11 is being tested in the detection chamber 44, the upstream valve 42 and the downstream valve 43 can be closed for a set duration to create a negative pressure environment within the detection chamber 44. When the fuel ball 11 leaves the detection chamber 44, the downstream valve 43 opens, and the blowing device 45 starts and continuously blows inert gas for a certain period of time to drive the fuel ball 11 to roll and leave the detection chamber 44.

[0072] The aforementioned control module is electrically connected to the upstream valve 42 and the downstream valve 43. It can be selected that the detection tube 41 is equipped with an upstream detector in front of the upstream valve 42, and a downstream detector is equipped in the detection chamber 44 near the downstream valve 43. After receiving the signal from the upstream detector, the control module opens the upstream valve 42 and automatically closes the upstream valve 42 after a certain period of time. After receiving the signal from the downstream detector, the control module opens the downstream valve 43 and automatically closes the downstream valve 43 after a certain period of time.

[0073] Reference Figure 1 and Figure 2 As shown, in some embodiments, the control module includes a controller and a first detector 51, a second detector 52, a third detector 53 and a fourth detector 54 arranged sequentially along the moving direction of the fuel ball 11.

[0074] The first detector 51 and the second detector 52 are located on both sides of the upstream valve 42, and the third detector 53 and the fourth detector 54 are located on both sides of the downstream valve 43. The second detector 52 and the third detector 53 are spaced apart. When the fuel ball 11 is positioned between the second detector 52 and the third detector 53, the detection module detects the activity value.

[0075] When the fuel ball 11 triggers the first detector 51, the controller controls the upstream valve 42 to open; when the fuel ball 11 triggers the second detector 52, the controller controls the upstream valve 42 to close; when the fuel ball 11 triggers the third detector 53, the controller controls the downstream valve 43 to open; when the fuel ball 11 triggers the fourth detector 54, the controller controls the downstream valve 43 to close.

[0076] In this way, the first detector 51, the second detector 52, the third detector 53 and the fourth detector 54 cooperate with the controller to realize the automatic opening and closing of the upstream valve 42 when the fuel ball 11 enters the detection cavity 44, and realize the automatic opening and closing of the downstream valve 43 when the fuel ball 11 leaves the detection cavity 44. It is ensured that the upstream valve 42 is closed only after the fuel ball 11 enters the detection cavity 44, and the downstream valve 43 is opened only when the fuel ball 11 reaches the periphery of the downstream valve 43.

[0077] The distance between the first detector 51 and the upstream valve 42 is a first distance, and the size of the first distance is determined according to the execution time from the time when the control module processes the signal of the first detector 51 to the time when the upstream valve 42 receives and completes the action command, and the flow speed of the fuel ball 11. The size of the first distance is set to ensure that the fuel ball 11 completes the opening action of the upstream valve 42 before entering the sipping analysis device 4 after passing through the first detector 51.

[0078] After the detection module completes the detection, the blowing device 45 is started to drive the fuel ball 11 to roll towards the downstream valve 43. The distance between the fourth detector 54 and the downstream valve 43 is a second distance, and the size of the second distance is determined according to the time from the signal of the fourth detector 54 to the time when the combined converter 2 receives and completes the action command, and the moving speed of the fuel ball 11, to ensure that the fuel ball 11 can return to the reactor 1 or be unloaded after entering the combined converter 2.

[0079] The space between the second detector 52 and the third detector 53 is a detection area. The fuel ball 11 rolls at a low speed, and stops in the detection area when the fuel ball 11 rolls into the detection area. When the fuel ball 11 is in the detection area, the detection module performs a detection operation; after completing the detection, the blowing device 45 is started to drive the fuel ball 11 to move, and the fuel ball 11 moves to the third detector 53 to open the downstream valve 43.

[0080] The controller is a chip or a microcomputer, and the first detector 51, the second detector 52, the third detector 53 and the fourth detector 54 are all photoelectric sensors. When the fuel ball 11 moves to the position of the corresponding detector, the detector will transmit an electrical signal to the controller, and the controller will control the opening and closing of the upstream valve 42 and the downstream valve 43 according to the signals transmitted by different detectors.

[0081] The control module can further include a control cabinet, signal processing software, a power supply, and a backup power supply. The controller is installed in the control cabinet, the signal processing software is loaded on the controller, and the power supply and the backup power supply are electrically connected to the controller.

[0082] Referring to Figure 1 and Figure 2 In some embodiments, the detection module includes:

[0083] A gas circuit is in communication with the gas inlet channel 441 and the gas outlet channel 442 to inject gas into the detection chamber 44 and to extract gas from the detection chamber 44.

[0084] A nuclide detection device is connected to the gas circuit and is arranged downstream of the gas outlet channel 442 to detect the activity value of the target radioactive nuclide contained in the gas discharged from the gas outlet channel 442.

[0085] A data analysis device is electrically connected to the nuclide detection device and the control module, receives the detection data of the nuclide detection device, and compares and analyzes the activity constraint value to deliver a control signal to the control module, which controls the combined converter 2 to return or unload the fuel ball 11 according to the control signal.

[0086] In this way, the nuclide detection device accurately quantifies various types of radioactive nuclides in the gas and the corresponding activity values, and the data analysis device analyzes the detection data of the nuclide detection device to determine whether the fuel ball 11 is leaking, thereby reducing the computational load of the control module.

[0087] Specifically, the gas circuit includes a gas injection pipeline and a gas extraction pipeline. Each pipeline mainly includes an electric valve, a mechanical valve, a power device, and a gas storage tank. The gas injection pipeline is in communication with the gas inlet channel 441, and the gas extraction pipeline is in communication with the gas outlet channel 442. The gas injection pipeline can inject inert gas into the detection chamber 44, and the gas extraction pipeline can extract the gas in the detection chamber 44.

[0088] The nuclide detection device is connected to the gas extraction pipeline, so that the nuclide detection device can detect the activity value of the target radioactive nuclide contained in the gas extracted by the gas extraction pipeline. The nuclide detection device detects the type and activity value of the nuclide contained in the mixed gas purged from the detection chamber 44 according to the radioactive nuclide peak emitted by the standard calibration source, selects the target radioactive nuclide to determine the corresponding activity value. The nuclide detection device mainly consists of a standard calibration source, a detection device scintillation counter, and an ionization chamber.

[0089] The data analysis device stores the nuclide information measured by the nuclide detection device, and compares the nuclide information with the activity constraint value of the fuel breakage determination formula to determine whether the fuel has been broken. The data analysis device is mainly composed of a data storage hardware device and data analysis software. After the data analysis device completes the determination, it sends a leakage signal or a non-leakage signal to the control module; after the control module receives the leakage signal, the fuel ball 11 is unloaded; after the control module receives the non-leakage signal, the detection result of the burnup measurement device 3 is received, and if the fuel ball 11 can continue to react, the fuel ball 11 is returned to the reactor 1.

[0090] Referring to Figure 1 and Figure 2 In some embodiments, the sip analysis device 4 further includes a filter collection module, the gas circuit includes a purge pipeline, the filter collection module is connected with the purge pipeline, the purge pipeline is connected with the detection tube 41, the purge pipeline blows inert gas into the detection tube 41 at a set pressure, and the filter collection module collects the inert gas flowing through the detection cavity 44.

[0091] In this way, the purge pipeline blows inert gas into the detection tube 41, which cleans the detection cavity 44 of the remaining gas containing radioactive nuclides, reducing the impact of the remaining gas in the detection cavity 44 on the determination of whether the reactor fuel ball 11 leaks. The filter collection module collects and stores the inert gas after purging to avoid secondary pollution caused by the inert gas after purging.

[0092] Specifically, the purge pipeline includes a forward blowing pipeline and a reverse blowing pipeline, the forward blowing pipeline is in communication with the air inlet channel 441, the reverse blowing pipeline is in communication with the air outlet channel 442, and the forward blowing pipeline and the reverse blowing pipeline are both connected with the filter collection module. The purge pipeline includes an electric valve, a mechanical valve, a power device and a gas storage tank, so that the forward blowing pipeline and the reverse blowing pipeline can blow inert gas into the detection cavity 44. After completing a detection, the sip analysis device 4 needs to be purged and back purged to reduce the impact of cross contamination of the flowing gas during the sip analysis of the fuel element on the determination of fuel breakage.

[0093] During purging, the upstream valve 42 and the downstream valve 43 are in a closed state, the forward blowing pipeline blows clean inert gas into the detection cavity 44 at a set pressure, and then the inert gas enters the filter collection module through the reverse blowing pipeline; during back purging, the upstream valve 42 and the downstream valve 43 are in a closed state, the reverse blowing pipeline blows clean inert gas into the detection cavity 44 at a set pressure, and then the inert gas enters the filter collection module through the forward blowing pipeline.

[0094] The filter collection module includes a filter, an adsorber and a collection tank connected in sequence, and the inert gas in the purge pipeline passes through the filter and the adsorber and then enters the collection tank. The filter and the adsorber can regularly collect radioactive graphite dust and debris and store them in the collection tank.

[0095] Referring to Figure 2 As shown in FIG. 4, in some embodiments, the air inlet channel 441 is arranged at the bottom side of the air outlet channel 442, and a support net 443 is arranged in the air inlet channel 441, which is used to support the fuel balls 11 in the detection cavity 44.

[0096] In this way, the support net 443 supports the fuel balls 11, avoiding the fuel balls 11 from entering the air inlet channel 441.

[0097] Specifically, the air inlet channel 441 and the air outlet channel 442 are arranged opposite to each other in the vertical direction. In order to avoid the air inlet channel 441 affecting the rolling of the fuel balls 11, a support net is arranged in the air inlet channel 441 to support the fuel balls 11, and the gas can blow into the detection cavity 44 through the support net. The selection condition of the material of the support net is that the activation product under irradiation condition is not the same as the target radionuclide of the fuel failure analysis.

[0098] Referring to Figure 1 and Figure 2 As shown in FIG. 5, in some embodiments, the detection tube 41 is provided with a gas branch 47, both ends of the gas branch 47 are in communication with the detection tube 41, one end of the gas branch 47 is arranged at the side of the upstream valve 42 away from the downstream valve 43, and the other end is arranged at the side of the downstream valve 43 away from the upstream valve 42.

[0099] In this way, the gas branch 47 can guide the gas in both ends of the detection tube 41 to flow when the upstream valve 42 and the downstream valve 43 are closed, avoiding the accumulation of the gas discharged by the burnup measurement device 3 when the detection module is detecting.

[0100] Specifically, both ends of the gas branch 47 are in communication with the detection tube 41, and when the upstream valve 42 and the downstream valve 43 are closed, the detection tube 41 is blocked, and the gas discharged by the burnup measurement device 3 can flow in the gas branch 47 to pass through the upstream valve 42 and the downstream valve 43.

[0101] Referring to Figure 2 As shown in FIG. 6, in some embodiments, the detection tube 41 is provided with a blowing resistance device 46, which is arranged at the side of the upstream valve 42 away from the downstream valve 43, and the blowing resistance device 46 can blow gas in the direction away from the upstream valve 42 to slow down the moving speed of the fuel balls 11 entering the detection tube 41.

[0102] In this way, the blowing resistance device 46 exerts resistance on the rolling of the fuel balls 11 after being started, so as to slow down the moving speed of the fuel balls 11 when entering the detection tube 41, avoiding the collision between the fuel balls 11 and the upstream valve 42.

[0103] Specifically, the blow resistance device 46 is arranged on the inner wall of the detection tube 41, which can be selected to include a gas tank and a nozzle, the nozzle is arranged in the direction away from the upstream valve 42, the gas blown by the blow resistance device 46 can slow down the rolling speed of the fuel ball 11 towards the detection chamber 44, avoid the fuel ball 11 colliding with the upstream valve 42 due to the too fast rolling speed of the fuel ball 11, and avoid the fuel ball 11 being difficult to stay between the second detector 52 and the third detector 53 in the detection chamber 44 for detection due to the too fast rolling speed of the fuel ball 11.

[0104] The detection tube 41 has a certain angle with the horizontal direction, so that when the end of the detection tube 41 close to the burnup measurement device 3 is higher than the end away from the burnup measurement device 3, the driving force of the fuel ball 11 rolling in the detection tube 41 includes its own gravity, and the blow resistance device 46 needs to be arranged in the detection tube 41 to provide resistance to the rolling of the fuel ball 11, so as to slow down the speed of the fuel ball 11 when entering the detection chamber 44.

[0105] In some embodiments, the combined converter 2 comprises a sorting mechanism, which guides the fuel ball 11 to the inlet of the reactor 1 or discharges it according to the instruction of the control module.

[0106] In this way, the control module can control the movement trajectory of the fuel ball 11 by controlling the sorting mechanism, thereby improving the automation degree of the combined converter 2 returning the fuel ball 11 to the reactor 1 or discharging it.

[0107] Specifically, the sorting device can be selected to include a double swing arm guide and three channels, the first channel returns to the reactor 1, the second channel is connected to the waste tank or the spent fuel tank, and the third channel is connected to the sip analysis device 4 to receive the fuel ball 11.

[0108] When the burnup value is less than the set burnup threshold value, and the activity value is less than the activity constraint value, the control module controls the double swing arm guide to block the second channel, so that the fuel ball 11 returns to the reactor 1 through the first channel.

[0109] When the burnup value is greater than or equal to the set burnup threshold value, or the activity value is greater than or equal to the activity constraint value, the control module controls the double swing arm guide to block the first channel, so that the fuel ball 11 moves to the waste tank or the spent fuel tank through the second channel, thereby discharging the fuel ball 11 from the system.

[0110] The gas branch 47 can be connected to the filter collection module to make the gas in the gas branch 47 flow into the filter collection module. The filter collection module can be connected to a gas return pipeline, and the gas return pipeline comprises an electric valve, a mechanical valve, a power device and a gas storage tank. The gas return pipeline can supplement the gas in the gas circuit to maintain the normal pressure in the gas circuit. Meanwhile, the gas in the filter collection module can also flow into the gas return pipeline for storage.

[0111] The sip analysis device 4 and the control module are both provided with shielding protection modules to avoid the interference of radioactive particles on the sip analysis device 4 and the control module. The shielding protection modules can have a certain space, so that the staff can repair and maintain the sip analysis device 4 and the control module in the shielding protection modules.

[0112] In the default state, the upstream valve 42 and the downstream valve 43 are in the closed state, the gas in the burnup measurement device 3 flows through the gas branch 47, and the gas in the gas branch 47 can be selected to be stored in the filter collection module. The gas injection pipeline and the gas extraction pipeline in the gas circuit are normally operated and the flow is adapted, so that the detection tube 41 is in a pressure balance state.

[0113] The fuel ball 11 in the reactor 1 falls into the burnup measurement device 3 to detect the burnup. After the burnup measurement device 3 detects the burnup value of the fuel ball 11, the burnup value is compared with the set burnup threshold value to determine the burnup degree of the fuel ball 11 to determine whether the fuel ball 11 can continue to react. If the burnup value is less than the set burnup threshold value, a return signal is sent to the control module, and if the burnup value is greater than or equal to the set burnup threshold value, an unloading signal is sent to the control module.

[0114] After the burnup measurement device 3 completes the detection, the fuel ball 11 rolls into the detection tube 41, and the blow-off device 46 slows down the rolling speed of the fuel ball 11. When the fuel ball 11 rolls to the first detector 51, the first detector 51 is triggered to open the upstream valve 42. After the fuel ball 11 enters the detection chamber 44, the second detector 52 is triggered, the upstream valve 42 is closed, and the fuel ball 11 falls into the support net 443 to remain stationary.

[0115] After the control module receives the signal sent by the second detector 52, the control module controls the detection module to work, increases the flow of the gas injection pipeline and the gas extraction pipeline, and the flow of the gas extraction pipeline is greater than that of the gas injection pipeline, so that a negative pressure environment is formed in the detection chamber 44. The nuclide detection device detects the activity value of the target radioactive nuclide in the extracted gas, the detection module makes the negative pressure environment in the detection chamber 44 last for a set time length, and the nuclide detection device operates for a set time length. The mixed gas passing through the nuclide detection device will be stored in the filter collection module and the gas return pipeline.

[0116] The data analysis device analyzes the activity value of the contrast detection and the activity constraint value, and sends an un-leakage signal to the controller when the activity value is less than the activity constraint value, and sends a leakage signal to the controller when the activity value is greater than or equal to the activity constraint value.

[0117] After the detection module completes the detection, the control module controls the flow of the gas injection pipeline and the gas extraction pipeline, so that the flow balance value of the gas injection pipeline and the gas extraction pipeline is in a default state. After the control module receives the signal sent by the data analysis device, the control module controls the switching channel of the sorting structure of the combined converter 2.

[0118] After the sorting structure completes the switching, the control module controls the blowing device 45 to blow out the inert gas to drive the fuel ball 11 to roll towards the downstream valve 43. When the fuel ball 11 rolls to the third detector 53, the control module controls the downstream valve 43 to open, so that the fuel ball 11 leaves the detection cavity 44. When the fuel ball 11 rolls to the fourth detector 54, the fourth detector 54 triggers to make the downstream valve 43 close.

[0119] When the control module receives the return signal and the un-leakage signal, the fuel ball 11 moves into the combined converter 2 and returns to the reactor 1 through the first channel; when the control module receives the discharge signal or the leakage signal, the fuel ball 11 moves into the combined converter 2 and is discharged from the system through the second channel.

[0120] Before the next sip analysis is performed, the online sip device also needs to be purged and back purged; during the purging, the upstream valve 42 and the downstream valve 43 are in a closed state, the positive blowing pipeline blows clean inert gas into the detection cavity 44 at a set pressure, and then the inert gas enters the filter collection module through the back blowing pipeline; during the back purging, the upstream valve 42 and the downstream valve 43 are in a closed state, the back blowing pipeline blows clean inert gas into the detection cavity 44 at a set pressure, and then the inert gas enters the filter collection module through the positive blowing pipeline.

[0121] After the control module receives the signal that the purging and back purging are completed, the sip analysis device 4 is reset, the reset of the sip analysis device 4 is completed, and the next fuel ball 11 analysis process is entered.

[0122] In the accident operation condition, the safety of the high-temperature gas cooled reactor system is the first, after the control module receives the protection signal sent by the reactor 1, the control module controls the upstream valve 42 and the downstream valve 43 to keep open, to ensure that the fuel ball 11 is discharged from the reactor 1 as soon as possible.

[0123] It has to be noted that, in the present document, relational terms are intended only to convey a possible relationship between elements or

[0124] The above description is merely that of a specific implementation to enable a person skilled in the art to understand or implement the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high temperature gas cooled reactor system, characterized by, The application relates to a nuclear fuel management system, which comprises: a reactor (1); a combined converter (2) connected to the inlet of the reactor (1); a burnup measuring device (3) connected to the outlet of the reactor (1) and used for detecting the burnup value of a fuel ball (11); a sip analysis device (4) connected between the burnup measuring device (3) and the combined converter (2), wherein the sip analysis device (4) is provided with a detection cavity (44) for receiving the fuel ball (11) from the burnup measuring device (3) and capable of establishing a negative pressure environment in the detection cavity (44) to detect the activity value of a target radionuclide in the gas in the detection cavity (44); a control module electrically connected to the combined converter (2), the burnup measuring device (3) and the sip analysis device (4); when the burnup value is less than a set burnup threshold value and the activity value is less than an activity constraint value, the control module controls the combined converter (2) to return the fuel ball (11) to the reactor (1) for recycling; when the burnup value is greater than or equal to the set burnup threshold value or the activity value is greater than or equal to the activity constraint value, the control module controls the combined converter (2) to unload the fuel ball (11).

2. The high temperature gas cooled reactor system according to claim 1, characterized in that, The sip analysis device (4) comprises: a detection tube (41) having two ends respectively communicated with the burnup measuring device (3) and the combined converter (2), wherein the detection tube (41) is provided with an air inlet channel (441) and an air outlet channel (442); an upstream valve (42) and a downstream valve (43) installed in the detection tube (41) and spaced apart along the moving direction of the fuel ball (11), wherein the upstream valve (42) and the downstream valve (43) are electrically connected to the control module so that the control module controls the opening and closing of the upstream valve (42) and the downstream valve (43), the upstream valve (42) is arranged on the side of the downstream valve (43) close to the reactor (1), and the air inlet channel (441) and the air outlet channel (442) are located between the upstream valve (42) and the downstream valve (43); a detection module communicated with the air inlet channel (441) and the air outlet channel (442); a blowing device (45) fixed to the inner wall of the detection tube (41) and adjacent to the upstream valve (42) and used for driving the fuel ball (11) to leave the detection cavity (44); when the upstream valve (42) and the downstream valve (43) are closed, the detection tube (41) forms a sealed detection cavity (44), the detection module injects air into the detection cavity (44) through the air inlet channel (441) and extracts air through the air outlet channel (442) to establish a negative pressure environment, and the detection module detects the activity value of the target radionuclide in the extracted air.

3. The high temperature gas cooled reactor system according to claim 2, characterized in that, When the fuel ball (11) enters the detection cavity (44), the control module controls the upstream valve (42) to open and the downstream valve (43) to close; when the detection module detects the activity value, the control module controls the upstream valve (42) and the downstream valve (43) to close; when the fuel ball (11) leaves the detection cavity (44), the control module controls the upstream valve (42) to close and the downstream valve (43) to open.

4. The high temperature gas cooled reactor system according to claim 3, characterized in that, The control module comprises a controller and first, second, third and fourth detectors (51, 52, 53, 54) arranged in sequence along the moving direction of the fuel ball (11); The first and second detectors (51, 52) are arranged on the two sides of the upstream valve (42), and the third and fourth detectors (53, 54) are arranged on the two sides of the downstream valve (43); the second and third detectors (52, 53) are arranged at intervals, and the detection module detects the activity value when the fuel ball (11) is positioned between the second and third detectors (52, 53). When the fuel ball (11) triggers the first detector (51), the controller controls the upstream valve (42) to open; when the fuel ball (11) triggers the second detector (52), the controller controls the upstream valve (42) to close; when the fuel ball (11) triggers the third detector (53), the controller controls the downstream valve (43) to open; and when the fuel ball (11) triggers the fourth detector (54), the controller controls the downstream valve (43) to close.

5. The high temperature gas cooled reactor system according to claim 2, characterized in that, The detection module comprises: A gas circuit in communication with the gas inlet channel (441) and the gas outlet channel (442) to inject and exhaust gas into and from the detection cavity (44); A nuclide detection device connected to the gas circuit and arranged downstream of the gas outlet channel (442) to detect the activity value of the target radioactive nuclide contained in the gas exhausted from the gas outlet channel (442); A data analysis device electrically connected to the nuclide detection device and the control module, receiving detection data from the nuclide detection device and comparing and analyzing the activity constraint value to send a control signal to the control module, which controls the combined converter (2) to return or discharge the fuel ball (11) according to the control signal.

6. The high temperature gas cooled reactor system according to claim 5, characterized in that, The sip analysis device (4) further comprises a filter collection module, the gas circuit comprises a purge pipeline, the filter collection module is connected to the purge pipeline, the purge pipeline is connected to the detection tube (41), the purge pipeline blows inert gas into the detection tube (41) at a set pressure, and the filter collection module collects the inert gas flowing through the detection cavity (44).

7. The high temperature gas cooled reactor system according to claim 2, characterized in that, The air inlet channel (441) is arranged at the bottom side of the air outlet channel (442), and a support net (443) is arranged in the air inlet channel (441), and the support net (443) is used for bearing the fuel balls (11) in the detection cavity (44).

8. The high temperature gas cooled reactor system according to claim 2, characterized in that, A gas branch (47) is arranged on the detection tube (41), and both ends of the gas branch (47) are communicated with the detection tube (41), one end of the gas branch (47) is arranged at the side, away from the downstream valve (43), of the upstream valve (42), and the other end is arranged at the side, away from the upstream valve (42), of the downstream valve (43).

9. The high temperature gas cooled reactor system according to claim 2, characterized in that, A blow resistance device (46) is arranged in the detection tube (41), and the blow resistance device (46) is arranged at the side, away from the downstream valve (43), of the upstream valve (42), and the blow resistance device (46) can blow air in the direction away from the upstream valve (42) to slow down the moving speed of the fuel balls (11) entering the detection tube (41).

10. The high temperature gas cooled reactor system according to claim 1, characterized in that, The combined converter (2) comprises a sorting mechanism, which directs the fuel balls (11) to the inlet of the reactor (1) or discharges them according to the instruction of the control module.

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