CN111028966B - Detection device, system and method for spherical element in high-temperature gas cooled reactor - Google Patents
Detection device, system and method for spherical element in high-temperature gas cooled reactor Download PDFInfo
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- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/06—Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
- G21C17/066—Control of spherical elements
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P11/00—Measuring average value of speed
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- G—PHYSICS
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/202—Measuring radiation intensity with scintillation detectors the detector being a crystal
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- G01T1/16—Measuring radiation intensity
- G01T1/24—Measuring radiation intensity with semiconductor detectors
- G01T1/248—Silicon photomultipliers [SiPM], e.g. an avalanche photodiode [APD] array on a common Si substrate
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- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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Abstract
The invention discloses a detection device, a system and a method for a spherical element in a high-temperature gas cooled reactor. Detection device is located loading and unloading pipeline periphery, and wherein, detection device includes: the detector is used for acquiring signals when the spherical element passes through the loading and unloading pipeline; and the processor is used for judging the category of the spherical element according to the signal. According to the embodiment of the invention, the graphite spheres and the fuel spheres can be identified through various signal conditions obtained when the graphite spheres and the fuel spheres with different fuel consumptions pass through the detection device, so that the stability and the accuracy of a fuel loading and unloading system are ensured, and the continuous and reliable operation of a reactor is realized.
Description
Technical Field
The invention relates to the field of nuclear fuel of a reactor, in particular to a detection device, a system and a method for a spherical element in a high-temperature gas cooled reactor.
Background
The Reactor of the High Temperature gas cooled Reactor nuclear power plant demonstration project (HTR-PM pebble bed modular High Temperature gas cooled Reactor nuclear power plant HTR-PM (High Temperature Reactor-pebbled Modules)) is a pebble bed Reactor, and a long transition period is required from initial charging to the time when the Reactor reaches an equilibrium state. Because the pebble bed reactor needs to continuously operate, in order to ensure the continuous and reliable operation of the high-temperature reactor, the loading and unloading processes of the fuel spheres and the graphite spheres need to be effectively controlled.
Therefore, how to identify the fuel spheres and the graphite spheres becomes a problem which needs to be solved urgently.
Disclosure of Invention
In view of one or more of the above-mentioned problems, embodiments of the present invention provide an apparatus, system, and method for detecting spherical elements in a high temperature gas cooled reactor. The graphite nodules and the fuel nodules can be identified according to various signal conditions obtained when the graphite nodules and the fuel nodules with different fuel consumptions pass through the detection device, so that the stability and the accuracy of a fuel loading and unloading system are guaranteed, and the continuous and reliable operation of a reactor is realized.
In a first aspect, a detection device for spherical elements in a high temperature gas cooled reactor is provided. The detection device includes: the detector is used for acquiring signals when the spherical element passes through the loading and unloading pipeline; and the processor is used for judging the category of the spherical element according to the signal.
In one possible implementation, the processor is specifically configured to compare the signal with a previously acquired initial signal to determine the type of the spherical element, wherein the initial signal is a signal obtained by the detector when no spherical element passes through the loading and unloading pipeline.
In one possible implementation, the processor is further configured to determine the spherical elements as graphite spheres and/or fuel spheres loaded into the pipeline when the signal is less than the initial signal; when the signal is greater than the initial signal and less than a first threshold value, determining the spherical element as a graphite ball of the discharge pipeline; and when the signal is greater than the initial signal and greater than a first threshold value, determining the spherical element as a fuel ball discharged from the pipeline.
In a possible implementation, the detection means are also adapted to count each type of spherical element separately according to its category.
In one possible implementation, the detecting device further includes: the device comprises an outer auxiliary radiation source, a collimator, a shielding structure, a heat-insulating layer and a supporting structure; the heat preservation layer is attached to the periphery of the loading and unloading pipeline; the supporting structure is formed by splicing two semicircular ring devices and is attached to the heat-insulating layer; the outer auxiliary radiation source is wrapped on the shielding structure and then nested in the supporting structure; the collimator is positioned on the connecting line of the central axes of the outer auxiliary radiation source and the detector; the outer auxiliary radiation source is used for providing gamma rays so that the detection device can acquire signals at the periphery of the loading and unloading pipeline; the shielding structure is used for shielding radiation interference around the detection device; the heat insulation layer is used for insulating heat of the detection device; the collimator is used for enabling the gamma rays provided by the outer auxiliary radiation source to enter the detector in a collimating way; and the supporting structure is used for arranging the outer auxiliary radiation source, the collimator, the shielding structure, the heat insulation layer and the detector.
In a possible implementation, the detection means comprise at least one detector, which, when the detection means comprise at least two detectors, are located at the same axial position of the loading and unloading pipe.
In one possible implementation, the detection device is formed by splicing two semicircular ring devices.
In a second aspect, a velocity measurement system is provided. The system comprises: acquiring two groups of signals corresponding to the same spherical element passing through any two detection devices; determining a time difference between the two sets of signals; the average velocity of the spherical element is determined from the time difference and the distance between the center positions of any two of the detecting means.
In a third aspect, a method of probing is provided. The method comprises the following steps: collecting signals generated when the spherical element passes through a loading and unloading pipeline by using a detector; and judging the category of the spherical element according to the signal.
The embodiment can identify the graphite nodules and the fuel nodules according to various signal conditions obtained when the graphite nodules and the fuel nodules with different fuel consumptions pass through the detection device, so that the stability and the accuracy of a fuel loading and unloading system are guaranteed, and the continuous and reliable operation of a reactor is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a detection apparatus provided in an embodiment of the present invention;
FIG. 2 is a block diagram of a probe apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of a detection device provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a detection system provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a detection method according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The reactor of the high temperature gas cooled reactor nuclear power plant demonstration project (HTR-PM) is a pebble bed reactor and a relatively long transition period elapses from initial charge to the time the reactor reaches equilibrium. During initial core loading, graphite spheres and low enrichment fuel spheres, e.g., low enrichment fuel spheres with a fuel enrichment of 4.3%, are proportionally mixed within the core. When the reactor is operated to a certain stage, the graphite nodules are identified and are discharged, loaded and unloaded into the graphite storage tank. After the graphite nodules are completely discharged, high-enrichment fuel nodules, for example, high-enrichment fuel nodules with a fuel enrichment of 8.5%, are added to the core. It is then necessary to identify the low enrichment fuel spheres that reach a certain burn-up, have been irradiated and have strong gamma-radiation and gradually discharge them completely to the fuel storage tank for storage.
Because the pebble bed reactor needs to continuously operate, the loading and unloading of fuel pebbles and graphite pebbles are effectively controlled in order to ensure that the reactor is not stopped. The embodiment of the invention provides a detection device, a system and a method for a spherical element in a high-temperature gas cooled reactor, and firstly, the detection device provided by the embodiment of the invention is described.
Fig. 1 is a schematic structural diagram of a detection apparatus according to an embodiment of the present invention.
As shown in fig. 1, the detecting apparatus 100 may include: a detector 110 and a processor 120.
Wherein the detector 110 is used to acquire the signal of the spherical element as it passes through the loading and unloading pipeline. The processor 120 is configured to determine the classification of the ball element based on the signal.
The gamma radiation intensities of fuel spheres and graphite spheres of different burnup are different, so that when the spherical elements pass through the loading and unloading pipe sections where the detection devices are located, the detection devices can output relatively different signals, and the processor identifies the types of the spherical elements passing through the loading and unloading pipe according to the different signals.
In one embodiment, the processor 120 is specifically configured to compare the signal with a pre-acquired initial signal to determine the type of spherical element, wherein the initial signal is the signal obtained by the detector when no spherical element has passed through the loading and unloading pipeline.
Embodiments of the present invention also include the case where no elements pass, and the outer secondary radiation source forms a stable signal at the detector, i.e., the initial signal, when no spherical elements pass.
In one embodiment, Cs-137 is used as the external source of supplemental radiation, and the total gamma radiation count of the initial signal formed at the detector by the external source of supplemental radiation is about 103～105γ/s。
In one embodiment, the processor is further configured to determine the spherical elements as graphite spheres and/or fuel spheres loaded into the tube when the signal is less than the initial signal;
when the newly added fuel spheres or the newly added graphite spheres pass through the detection device, the external auxiliary radiation source can be shielded, and the detector outputs a negative signal relative to the initial signal because the newly added fuel spheres or the newly added graphite spheres have no radiativity. Thus, when the signal of the detector is less than the initial signal, the spherical elements can be determined to be graphite spheres and/or fuel spheres loaded into the pipeline.
In one embodiment, the spherical element is determined to be a graphite nodule of the discharge conduit when the signal is greater than the initial signal and less than a first threshold.
The outer auxiliary radiation source in the detection device is a gamma source, and the gamma radioactivity of the gamma source is lower than that of the graphite nodules before the graphite nodules are completely discharged and after the graphite nodules are irradiated to a certain degree, so that the graphite nodules after the graphite nodules are irradiated to a certain degree can be distinguished and completely discharged out of the pipeline when the signal detected by the detector is greater than the initial signal.
When the graphite nodules which are irradiated to a certain extent pass through the detection device, the gamma radiation intensity of the graphite nodules is larger than that of the outer auxiliary radiation source, and the detector outputs a positive signal of which the total gamma radiation number is larger than that of the initial signal and smaller than a first threshold value. Therefore, when the signal of the detector is greater than the initial signal and less than the first threshold value, it can be judged that the spherical element passing through the detection device is the graphite nodule of the discharge pipe. The value of the first threshold is determined according to an actual initial signal, the total gamma radiation count of the first threshold is larger than that of the initial signal, the corresponding total gamma radiation count is different according to different selected external auxiliary radiation sources and scintillation crystals, and generally speaking, the value of the first threshold is 2-10 times larger than that of the initial signal and is one order of magnitude smaller than the signal capability processed by a processor.
In one embodiment, the spherical element is determined to be an irradiated fuel sphere exiting the pipeline when the signal is greater than the initial signal and greater than a first threshold.
Therefore, the detection device provided by the embodiment of the invention can acquire the signals when the spherical element passes through the loading and unloading pipeline, and can identify different types of fuel spheres and graphite spheres according to different magnitude relations between the signals and the initial signals.
In one embodiment, the detection means are further adapted to count each type of spherical element separately according to the category of the spherical element. For example, when it is judged that the spherical element passing through the detecting means is the graphite nodule of the discharge tube, the graphite nodule of the discharge tube is cumulatively counted.
The detection device provided by the embodiment of the invention can identify and count the graphite spheres or the fuel spheres, the graphite spheres subjected to certain irradiation and the irradiated fuel spheres which are newly added into the loading and unloading pipeline, and the spherical elements are identified and counted by utilizing the signals with different intensities formed in the detector by utilizing the different gamma radiation intensities of the various spherical elements.
In one embodiment, the detection apparatus further comprises: the device comprises an outer auxiliary radiation source, a collimator, a shielding structure, a heat-insulating layer and a supporting structure; the heat preservation layer is attached to the periphery of the loading and unloading pipeline; the supporting structure is formed by splicing two semicircular ring devices and is attached to the heat-insulating layer; the outer auxiliary radiation source is wrapped on the shielding structure and then nested in the supporting structure; the collimator is positioned on the connecting line of the central axes of the outer auxiliary radiation source and the detector; the outer auxiliary radiation source is used for providing gamma rays so that the detection device can acquire signals at the periphery of the loading and unloading pipeline; the shielding structure is used for shielding radiation interference around the detection device; the heat insulation layer is used for insulating heat of the detection device; the collimator is used for enabling the gamma rays provided by the outer auxiliary radiation source to enter the detector in a collimating way; and the supporting structure is used for arranging the outer auxiliary radiation source, the collimator, the shielding structure, the heat insulation layer and the detector.
In one embodiment, gamma rays provided by the external secondary radiation source are used to irradiate the graphite spheres and the fuel spheres in the fuel handling tube.
Fig. 2 is a structural diagram of a detecting device according to an embodiment of the present invention, and as shown in fig. 2, the detecting device in fig. 2 includes: supporting structure 1, collimater 2, shielding structure 3, heat preservation 4 and outer auxiliary radiation source 5, wherein, the heat preservation laminating is in loading and unloading pipeline periphery, and supporting structure and heat preservation laminating, outer auxiliary radiation source parcel shielding structure back nestification are in supporting structure, and the collimater is located the axis line of outer auxiliary radiation source and detector, explains respectively below to above-mentioned component:
fig. 2 shows a supporting structure 1, which is used for accommodating the external auxiliary radiation source, the collimator, the shielding structure, the insulating layer and the supporting structure of the detection device, and plays a supporting role. The material of the supporting structure can be 316L steel, the supporting structure is formed by splicing a left semicircular ring and a right semicircular ring, and the inner cylindrical surface of the supporting structure is tightly attached to the material of the heat-insulating layer after splicing.
Fig. 2 shows a collimator 2 for collimating the gamma rays entering the detector and enhancing the accuracy of the signal, and the collimator may be made of tungsten. The collimator is nested on the connecting line of the central axes of the outer auxiliary radiation source and the detector and penetrates through the middle part of the supporting material.
In fig. 2, 3 is a shielding structure for shielding the external secondary radiation source and other radiation interference around the detector, and the shielding structure material may be tungsten.
And 4 in the figure 2 is a heat-insulating layer which is used for insulating heat of the detection device and preventing the detector from malfunctioning due to overhigh temperature, and the material of the heat-insulating layer can be synthetic silicate material and the like. The heat-insulating layer material is tightly wrapped on the periphery of the loading and unloading pipeline.
Fig. 2, 5, is an external secondary radiation source for providing a certain gamma irradiation to detect non-radioactive fresh fuel and graphite nodules.
The detector in fig. 2 is composed of a scintillation crystal, a silicon photomultiplier (or photomultiplier), and a subsequent electronic circuit, wherein the scintillation crystal is made of an inorganic scintillator csi (tl). The outer auxiliary radiation source is wrapped by a shielding structure material and then nested on the inner axis of the left semicircular ring of the supporting structure material at a proper distance from one side of the pipeline.
The detection device is arranged at the periphery of the fuel loading and unloading pipeline of the pebble-bed high-temperature reactor. The outer auxiliary radiation source, the collimator, the shielding structure, the heat insulating layer and the supporting structure of the detection device are tightly connected, and the detector is wrapped by the shielding material and then nested at a position which is a proper distance away from the other side of the pipeline on the inner central axis of the right semicircular ring of the supporting structure material.
Fig. 3 is a top view of the detection device according to the embodiment of the present invention, and the detection device shown in fig. 3 is formed by splicing two semicircular rings, so that the detection device can be conveniently disassembled and assembled, and two detectors are arranged at the same horizontal position of the loading and unloading pipeline, so as to improve the accuracy of the detection signal of the detectors.
In one embodiment, the detection means comprises at least one detector, and when the detection means comprises at least two detectors, the at least two detectors are located at the same axial position of the loading and unloading pipe.
When the detection device comprises two detectors, the detector 1 and the detector 2 are connected by adopting a coincidence circuit, the detector 1 and the detector 2 adopt a redundant configuration, and when the detection device fails, the detector with the redundant configuration can be used for intervening and bearing the work of the failed detector, so that the failure time of the system is reduced. Two detectors which are connected by adopting a coincidence circuit are arranged at the same horizontal position of the loading and unloading pipeline, so that the accuracy of the spherical element identification and counting of the detection device can be improved.
In one embodiment, the detection device is formed by splicing two semicircular ring devices. Whole detection device sets up to detachable for detection device dismouting is convenient like this, and is little to fuel loading and unloading pipe-line system influence.
Fig. 4 is a schematic flow chart illustrating a method for detecting spherical elements in a high temperature gas cooled reactor according to an embodiment of the present invention.
S410, acquiring signals generated when the spherical element passes through a loading and unloading pipeline by using a detector;
and S420, judging the type of the spherical element according to the signal.
According to the detection device provided by the embodiment of the invention, firstly, in the initial charging stage, the newly added fuel spheres and graphite spheres can be identified and counted; secondly, when discharging all graphite nodules, identifying and counting the graphite nodules discharged from the pipeline by using the characteristic of low gamma irradiation intensity of the graphite nodules discharged from the pipeline; then when loading the newly added high-enrichment fuel balls, identifying and counting the newly added fuel balls by utilizing the non-radiative characteristic of the newly added fuel balls; and finally, when discharging fuel balls with certain burning depth, identifying and counting the fuel balls discharged out of the pipeline by utilizing the difference of gamma irradiation intensity generated by superposition of internal nuclides under different burning conditions of the fuel balls.
According to the detection method of the spherical elements in the high-temperature gas-cooled reactor, provided by the embodiment of the invention, the types of the passing spherical elements are identified by detecting different types of signals output by the detector at the fuel loading and unloading pipeline when the reactor is in operation.
The embodiment of the present invention further provides a speed measurement system, as shown in fig. 5, the system is mainly used for: acquiring two groups of signals corresponding to the same spherical element passing through any two detection devices; determining a time difference between the two sets of signals; the average velocity of the spherical element is determined from the time difference and the distance between the center positions of any two of the detecting means.
FIG. 5 is a schematic diagram of a detection system according to an embodiment of the present invention, as shown in FIG. 5, wherein two sets of detection devices are positioned along the ball flow direction of the loading and unloading pipe, and the average velocity of the ball-shaped element through the loading and unloading pipe is determined based on the average velocity being equal to the distance divided by the time. Specifically, the average speed of the spherical element detected by the detection device when the spherical element passes through the two groups of detection devices of the loading and unloading pipeline is measured according to the time difference between two groups of signals detected by the two groups of detection devices and the distance between the central positions of the two groups of detection devices along the pipeline, so that the movement condition of the spherical element in the fuel loading and unloading pipeline is monitored.
Therefore, according to the detection device, the detection system and the detection method for the spherical element in the high-temperature gas-cooled reactor provided by the embodiment of the invention, on the premise of having as little influence on a reactor system and a reactor structure as possible, the graphite spheres and the fuel spheres with different fuel consumption in the pebble bed type high-temperature gas-cooled reactor can be identified, counted and tested in the transition stage from the initial charging stage to the equilibrium state, so that the stability and the accuracy of a fuel loading and unloading system are ensured, and the continuous and reliable operation of the reactor is realized.
Those of ordinary skill in the art will appreciate that the method steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of clearly illustrating the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus and other devices described above may refer to corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the functional hardware is merely a logical division, and in actual implementation, there may be another division, for example, multiple pieces of hardware may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices, or may be an electrical, mechanical or other form of connection.
In addition, various hardware in the embodiments of the present invention may be integrated into one processing unit, or may exist separately and physically. The integrated hardware can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention.
Claims (9)
1. A detection device for spherical elements in a high-temperature gas-cooled reactor, which is positioned at the periphery of a loading and unloading pipeline, and comprises:
the detector is used for acquiring signals when the spherical element passes through the loading and unloading pipeline;
a processor for determining the type of the spherical element according to the signal;
an external source of auxiliary radiation for providing gamma rays to cause said detecting means to generate said signal at the periphery of said loading and unloading pipeline;
the classes of spherical elements include: non-irradiated graphite nodules and fuel nodules, irradiated graphite nodules, irradiated fuel nodules.
2. The detection apparatus according to claim 1, wherein the processor is specifically configured to: and comparing the signal with a pre-collected initial signal to judge the category of the spherical element, wherein the initial signal is a signal obtained by the detector when no spherical element passes through the loading and unloading pipeline.
3. The detection apparatus of claim 2, wherein the processor is further configured to:
when the signal is less than the initial signal, determining the spherical elements to be unirradiated graphite and/or fuel spheres loaded into the pipeline;
when the signal is greater than the initial signal and less than a first threshold value, determining the spherical element to be an irradiated graphite sphere of the discharge pipe;
when the signal is greater than the initial signal and greater than a first threshold, determining the spherical element as an irradiated fuel sphere exiting the pipeline.
4. The probe apparatus of claim 1, wherein the probe apparatus is further configured to count each type of spherical element separately according to the category of the spherical element.
5. The probe apparatus of claim 1, further comprising: the device comprises a collimator, a shielding structure, a heat insulation layer and a supporting structure;
the heat preservation layer is attached to the periphery of the loading and unloading pipeline;
the supporting structure is formed by splicing two semicircular ring devices and is attached to the heat-insulating layer;
the outer auxiliary radiation source wraps the shielding structure and then is nested in the supporting structure;
the collimator is positioned on a connecting line of central axes of the outer auxiliary radiation source and the detector;
the shielding structure is used for shielding radiation interference around the detection device;
the heat insulation layer is used for insulating heat of the detection device;
the collimator is used for collimating gamma rays provided by the outer auxiliary radiation source into the detector;
the supporting structure is used for arranging the outer auxiliary radiation source, the collimator, the shielding structure, the heat preservation layer and the detector.
6. A detector arrangement according to claim 1, wherein the detector arrangement comprises at least one detector, and when the detector arrangement comprises at least two detectors, the at least two detectors are located at the same axial position of the loading and unloading pipeline.
7. The probe apparatus of claim 1, wherein the probe apparatus is formed by splicing two semicircular ring apparatuses.
8. A velocimetry system comprising at least two detection devices according to any of claims 1-7, comprising:
acquiring two groups of signals corresponding to the same spherical element passing through any two detection devices;
determining a time difference between the two sets of signals;
and determining the average speed of the spherical element according to the time difference and the distance between the center positions of any two detection devices.
9. A method for detecting spherical elements in a high-temperature gas-cooled reactor based on the detection device of any one of claims 1 to 7, wherein the method comprises the following steps:
collecting signals generated when the spherical element passes through a loading and unloading pipeline by using a detector;
and judging the category of the spherical element according to the signal.
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| CN111724922B (en) * | 2020-06-24 | 2022-04-08 | 西南科技大学 | High-temperature gas cooled reactor fuel conveying pipeline maintenance device, system and method |
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| CN113436764B (en) * | 2021-07-01 | 2022-09-23 | 四川核保锐翔科技有限责任公司 | High-temperature gas cooled reactor fuel ball blocking detection and protection method |
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