Detection device for control rod in reactor and chain type control rod transmission system

Abstract

The invention provides a detection device for a control rod in a reactor and a chain type control rod transmission system.The detection device comprises a controller, an excitation coil and a detection unit, and the excitation coil and the detection unit are both fixedly arranged on the periphery of a chain and are arranged in the extending direction of the chain; the excitation coil is parallel to the detection unit; after the excitation coil is powered on, the chain moves under the actual working condition to cause the change of magnetic flux in the excitation coil; the detection unit is used for acquiring corresponding actual magnetic signal information based on the change of the magnetic flux and sending the actual magnetic signal information to the controller; the controller is used for receiving the actual magnetic signal information and determining the motion state of the control rod based on the magnetic signal information. According to the detection device provided by the invention, the actual motion state of the control rod in the moving process can be determined under the condition that the control rod is not contacted.

Description

Technical Field

[0001] The present disclosure relates to the field of data measurement, and particularly to a detection device for control rods in a reactor and a chain-type control rod drive system. Background Art

[0002] In a reactor, traditional chain-type and wire rope hub-type control rod drive mechanism transmission systems usually adopt relative position measurement devices such as synchros, encoders, and resolvers. These devices are directly mechanically mounted in contact with the drive mechanism, and convert the linear displacement of the control rod into an angle for indirect measurement. However, there are some problems with this indirect measurement method: on the one hand, the position measurement device in contact with the control rod drive mechanism may be damaged due to wear or failure, thus affecting the operating function and safety function of the control rod; on the other hand, due to indirect measurement, it is impossible to directly determine whether there are operating conditions such as idling, chain skipping, chain slipping, rod jamming, and chain jamming in the control rod drive mechanism during operation. Summary of the Invention

[0003] The technical problem to be solved by the present disclosure is to overcome the defect in the prior art that it is impossible to determine whether there is a fault when the control rod is moving, and to provide a detection device for control rods in a reactor and a chain-type control rod drive system.

[0004] The present disclosure solves the above technical problem through the following technical solutions:

[0005] According to a first aspect of the present disclosure, there is provided a detection device for a control rod in a reactor, the detection device being applied in a chain-type control rod drive system, and the chain in the chain-type control rod drive system is driven by a drive mechanism to drive the control rod to move;

[0006] The detection device includes a controller, an excitation coil, and a detection unit. The excitation coil and the detection unit are both fixedly arranged around the outer periphery of the chain and are respectively arranged along the extending direction of the chain, and the excitation coil and the detection unit are in a parallel position;

[0007] After the excitation coil is powered on, the movement of the chain under actual working conditions will cause a change in the magnetic flux in the excitation coil;

[0008] The detection unit is used to obtain corresponding actual magnetic signal information based on the change in the magnetic flux and send it to the controller;

[0009] The controller is used to receive the actual magnetic signal information and determine the movement state of the control rod based on the magnetic signal information.

[0010] Optionally, the actual magnetic signal information corresponds to a number of pulses and a preset length, where the preset length is the length of each link in the chain in the extending direction of the chain;

[0011] The controller is further configured to obtain the pulse quantity information in the actual magnetic signal information; and calculate the moving distance corresponding to the chain based on the pulse quantity information to obtain the actual displacement of the control rod.

[0012] Optionally, the controller is further configured to obtain the standard magnetic signal information corresponding to the distance when the chain moves the actual displacement under standard conditions;

[0013] In response to the inconsistency between the actual magnetic signal information and the standard magnetic signal information, it is determined that an abnormality occurs during the movement of the control rod, and the movement of the control rod is stopped; in response to the consistency between the actual magnetic signal information and the standard magnetic signal information, it is determined that no abnormality occurs to the control rod under the drive of the chain.

[0014] Optionally, the controller is further configured to, in response to the inconsistency between the actual magnetic signal information and the standard magnetic signal information, compare the actual magnetic signal information with the standard magnetic signal information to obtain a comparison result, and determine the type of actual abnormal condition corresponding to the control rod based on the comparison result.

[0015] Optionally, the types of abnormal conditions include rod jamming, chain jamming, idling, chain skipping or chain slipping.

[0016] Optionally, the detection unit includes a first magnetic detector and a second magnetic detector;

[0017] Both the first magnetic detector and the second magnetic detector are arranged on one side of the excitation coil and are arranged successively away from the excitation coil, and are fixedly arranged on the outer periphery of the chain and are respectively arranged along the extending direction of the chain;

[0018] The first magnetic detector is configured to obtain corresponding first actual magnetic signal information based on the change of the magnetic flux of the excitation coil;

[0019] The second magnetic detector is configured to obtain corresponding second actual magnetic signal information based on the change of the magnetic flux of the excitation coil;

[0020] The controller is further configured to obtain the first actual magnetic signal information and the first actual magnetic signal information; in response to the change of the first actual magnetic signal information prior to the change of the second actual magnetic signal information, it is determined that the control rod is in the rising state; in response to the change of the second actual magnetic signal information prior to the change of the first actual magnetic signal information, it is determined that the control rod is in the falling state.

[0021] Optionally, the detection device further includes a compensation coil;

[0022] The compensation coil is sleeved outside the chain and is in a parallel position with the excitation coil, and the detection unit is arranged between the compensation coil and the excitation coil.

[0023] Optionally, the detection device further includes a fixing bracket;

[0024] The excitation coil, the detection unit and the compensation coil are all arranged in parallel and fixedly arranged on the fixing bracket, and the chain passes through the excitation coil, the detection unit and the compensation coil;

[0025] And / or,

[0026] The detection device further includes an alarm unit, and the alarm unit is communicatively connected to the controller;

[0027] The controller is further configured to generate a driving instruction when the movement of the control rod is abnormal, so as to drive the alarm unit to send out an alarm reminder message.

[0028] According to a second aspect of the present disclosure, there is provided a chain-type control rod drive system, and the chain-type control rod drive system includes the detection device for the control rod in the reactor according to the first aspect of the present disclosure.

[0029] According to a third aspect of the present disclosure, there is provided a method for detecting a control rod in a reactor, and the detection method is implemented by using the detection device for the control rod in the reactor according to the first aspect of the present disclosure. The detection method includes:

[0030] Using the detection unit, the movement of the chain under actual working conditions causes a change in the magnetic flux in the excitation coil;

[0031] Obtaining corresponding actual magnetic signal information;

[0032] Using the controller to determine the movement state of the control rod based on the magnetic signal information.

[0033] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present disclosure.

[0034] The positive and progressive effects of the present disclosure are as follows:

[0035] In the control rod detection device in the reactor and the chain-type control rod drive system provided by the present disclosure, a non-contact detection device is set to obtain the magnetic flux information of the chain during movement, and it is compared with the magnetic flux information during normal operation. Thus, by comparing the magnetic flux information, the rod position information during the movement of the control rod can be intuitively, simply and effectively obtained, and whether an abnormal condition occurs during the movement of the control rod can be determined according to the comparison result. Moreover, by means of the non-contact detection method, direct contact with the chain and the control rod is avoided, so that the detected object will not be worn or damaged, and at the same time, the safety of the detection personnel is ensured. Brief Description of the Drawings

[0036] Figure 1 Structural schematic diagram of the detection device in Embodiment 1 Figure 1 ;

[0037] Figure 2 Structural schematic diagram of the detection device in Embodiment 1 Figure 2 ;

[0038] Figure 3 Signal schematic diagram when determining the movement state of the control rod in Embodiment 1;

[0039] Figure 4 Signal schematic diagram when the control rod is operating normally in Embodiment 1;

[0040] Figure 5 Signal schematic diagram when the control rod is abnormal in Embodiment 1;

[0041] Figure 6 Structural schematic diagram of the chain-type control rod drive system in Embodiment 2;

[0042] Figure 7 Flow schematic diagram of the detection method of the control rod in the reactor in Embodiment 3. Detailed Description of the Embodiments

[0043] The following further illustrates the present disclosure by way of embodiments, but does not limit the present disclosure to the scope of the described embodiments.

[0044] In the embodiments of the present disclosure, prefix words such as "first" and "second" are only used to distinguish different described objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects, etc. The use of ordinal numbers and other prefix words for distinguishing described objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. The statement of the described objects refers to the description in the context of the claims or embodiments, and should not constitute unnecessary limitations because of the use of such prefix words. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "a plurality" is two or more.

[0045] Embodiment 1

[0046] The detection device in this embodiment is applied to a chain-type control rod drive system. The chain in the chain-type control rod drive system is driven by a drive mechanism to drive the control rod to move.

[0047] As Figure 1 shown, the detection device includes a controller 100, an excitation coil 200, and a detection unit 300. The excitation coil 200 and the detection unit 300 are both fixedly arranged on the outer periphery of the chain and are respectively arranged along the extension direction of the chain, and the excitation coil 200 and the detection unit 300 are in parallel positions.

[0048] After the excitation coil 200 is powered on, the movement of the chain under actual working conditions will cause a change in the magnetic flux in the excitation coil 200; the detection unit 300 is used to obtain the corresponding actual magnetic signal information based on the change in the magnetic flux and send it to the controller 100; the controller 100 is used to receive the actual magnetic signal information and determine the movement state of the control rod based on the magnetic signal information.

[0049] The present disclosure obtains the magnetic flux information of the chain during movement by setting a non-contact detection device in the chain-type control rod drive system, and compares it with the magnetic flux information during normal operation. Thus, by comparing the magnetic flux information, the rod position information of the control rod during movement can be obtained intuitively, simply and effectively. Through the non-contact detection method, direct contact with the chain and the control rod is avoided, so that the detected object will not be worn or damaged, and at the same time, the safety of the detection personnel is ensured.

[0050] The actual magnetic signal information in this embodiment corresponds to a number of pulses and a preset length, and the preset length is the length of each link of the chain in the extension direction of the chain.

[0051] In one implementation, the link is oval, and the length of one link is the major axis distance of the oval.

[0052] The controller is further used to obtain the pulse number information in the actual magnetic signal information; based on the pulse number information, calculate the moving distance corresponding to the chain to obtain the actual displacement of the control rod.

[0053] In a specific implementation, the chain is composed of a number of circular rings connected in series, and the chain is in a vertically stretched state in the natural state. When the control rod is not driven, the chain is in a stationary state; when the control rod is driven to move, the chain will move in a direction perpendicular to the ground. Therefore, when passing through the chain excitation coil, the magnetic flux will change, and the signals at the joints of the circular rings and the signals at non-joint places will be inconsistent, that is, "0" and "1" signals are generated when the chain moves, and a combination of one "0" and "1" signal is a pulse. That is, the moving displacement of the chain can be determined by the number of pulses, and then the displacement of the control rod can be determined.

[0054] The present disclosure obtains the magnetic flux information of the chain during movement through a non-contact detection device, and compares it with the magnetic flux information during normal operation. Thus, by comparing the magnetic flux information, the rod position information during the movement of the control rod can be intuitively, simply and effectively obtained. By comparing the magnetic flux information, the rod position information during the movement of the control rod can be intuitively, simply and effectively obtained. Through the non-contact detection method, direct contact with the chain and the control rod is avoided, so that the detected object will not be worn or damaged, and at the same time, the safety of the detection personnel is ensured.

[0055] In this embodiment, the controller is further configured to obtain the standard magnetic signal information corresponding to the actual displacement distance of the chain under standard working conditions;

[0056] In response to the actual magnetic signal information being inconsistent with the standard magnetic signal information, it is determined that an abnormality occurs during the movement of the control rod, and the movement of the control rod is stopped; in response to the actual magnetic signal information being consistent with the standard magnetic signal information, it is determined that no abnormality occurs under the drive of the chain for the control rod.

[0057] By directly comparing the standard magnetic signal information, it is further possible to quickly determine whether the control rod is in an abnormal state during movement, intuitively, simply and effectively obtain the rod position information during the movement of the control rod, and improve the detection efficiency.

[0058] In this embodiment, the controller is further configured to, in response to the actual magnetic signal information being inconsistent with the standard magnetic signal information, compare the actual magnetic signal information with the standard magnetic signal information to obtain a comparison result, and determine the actual abnormal working condition type corresponding to the control rod based on the comparison result.

[0059] Among them, the abnormal working condition types include rod jamming, chain jamming, idling, chain skipping or chain slipping.

[0060] In a specific implementation manner, by recording the standard magnetic signal information corresponding to different working conditions, and then when comparing the actual magnetic signal information with the standard magnetic signal information, the actual state of the control rod can be quickly determined, improving the detection efficiency.

[0061] In this embodiment, the detection unit includes a first magnetic detector and a second magnetic detector;

[0062] The first magnetic detector and the second magnetic detector are both arranged on one side of the excitation coil and are arranged in sequence away from the excitation coil, and are fixedly arranged on the outer periphery of the chain and are respectively arranged along the extension direction of the chain;

[0063] The first magnetic detector is configured to obtain corresponding first actual magnetic signal information based on the change in the magnetic flux of the excitation coil;

[0064] The second magnetic detector is used to obtain corresponding second actual magnetic signal information based on the change in the magnetic flux of the excitation coil;

[0065] The controller is further configured to obtain the first actual magnetic signal information and the first actual magnetic signal information; in response to the change in the first actual magnetic signal information occurring prior to the change in the second actual magnetic signal information, it is determined that the control rod is in the ascending state; in response to the change in the second actual magnetic signal information occurring prior to the change in the first actual magnetic signal information, it is determined that the control rod is in the descending state.

[0066] By providing the first magnetic detector and the second magnetic detector, the state of the control rod during the actual movement process can be determined. By obtaining the sequence of changes in the magnetic flux in the magnetic coil, the movement direction of the control rod, i.e., "lifting" or "lowering", can be determined. For example, when two magnetic coils are set in a vertical state, if the change in the magnetic flux in the upper magnetic coil is received first, it is determined that the movement direction of the control rod is the descending state; if the change in the magnetic flux in the lower magnetic coil is received first, it is determined that the movement direction of the control rod is the ascending state.

[0067] As Figure 1 shown, the detection device further includes a compensation coil 400;

[0068] The compensation coil 400 is sleeved outside the chain and is in a parallel position with the excitation coil 200, and the detection unit 300 is arranged in the middle of the compensation coil 400 and the excitation coil 200.

[0069] In this embodiment, by providing the compensation coil, the electromagnetic interference around the measurement environment is suppressed. Through the reverse magnetic field or signal adjustment of the compensation coil, these interferences are offset to ensure the stability of the signal generated by the excitation coil. At the same time, the molten salt reactor temperature environment may cause changes in the resistance or inductance characteristics of the sensor coil. By providing the compensation coil, automatic adjustment of the output through the temperature feedback circuit is realized, the temperature drift error is reduced, and the detection accuracy is further improved.

[0070] As Figure 1 shown, the detection device in this embodiment further includes a fixing frame 500;

[0071] The excitation coil 200, the detection unit 300, and the compensation coil 400 are all arranged in parallel and fixedly arranged on the fixing frame 500, and the chain passes through the excitation coil 200, the detection unit 300, and the compensation coil 400.

[0072] In a specific embodiment, the fixing unit includes a PEEK bracket (a high-performance bracket made of polyether ether ketone material) and a support plate.

[0073] By providing the fixing unit, the magnetic coil and the magnetic detector can be fixedly arranged outside the chain, improving the stability of the detection.

[0074] The detection device further includes an alarm unit, and the alarm unit is communicatively connected to the controller;

[0075] The controller is further configured to generate a driving instruction when the movement of the control rod is abnormal, so as to drive the alarm unit to send an alarm reminder message.

[0076] In one implementation, the generated alarm reminder message can be data that details the fault situation when it is detected that the control rod malfunctions during operation, so that the operator can take relevant countermeasures based on the specific fault information to ensure the safe operation of the reactor.

[0077] Among them, the data that details the fault situation at least includes the fault type (such as "idling", "chain skipping", "chain jamming", "rod jamming", etc.), the time when the fault occurred (such as the timestamp information when the fault occurred), the relevant parameters of the current drive mechanism (such as the moving speed and displacement deviation of the control rod), etc.

[0078] The working principle of the detection device in the embodiments of the present disclosure will be described below with specific implementations:

[0079] As Figure 2 shown, the detection device includes: a compensation coil a, an excitation coil b, a first magnetic detector c, and a second magnetic detector d;

[0080] Among them, the compensation coil a, the excitation coil b, the first magnetic detector c, and the second magnetic detector d are arranged at intervals outside the chain in the control rod drive system and are fixed by a PEEK bracket e;

[0081] Both the first magnetic detector c and the second magnetic detector d are configured to detect the change in magnetic flux in the excitation coil b when the chain moves, and determine the movement state of the chain based on the order of the change in magnetic flux.

[0082] As Figure 3 shown, the movement direction of the control rod is determined to be "lifting" or "lowering" based on the sequence relationship of the two magnetic coil signals.

[0083] As Figure 4 shown, the dual magnetic coil rod position measurement is non-contact, and the control rod position measurement does not affect the safety function and operating characteristics of the control rod. When the chain passes through the dual magnetic coils (the compensation coil and the excitation coil as shown) and the magnetic detector, the magnetic output signals of the coils in the "overlapping" area and the "non-overlapping" area of the chain are different. By recording the number of "0" and "1" of the magnetic signals, the relative displacement of the control rod is measured accordingly.

[0084] During normal operation of the control rod, the control rod position measurement information output by the magnetic coil is "equally spaced". By the "normal interval - compressed interval" of the coil pulses, it is determined whether the control rod is operating normally or abnormal conditions such as "chain jamming" and "rod jamming" occur.

[0085] As Figure 5 shown, through the relationship between the control rod position - stepping motor pulse number measured by the dual - holding coil, it can be roughly determined whether there are abnormal conditions such as "idle rotation" and "chain skipping" during the operation of the control rod.

[0086] Specifically, when the magnetic signal detected by any one magnetic detector shows "distortion", that is, the pulse interval of the actually detected magnetic signal becomes smaller compared with the standard magnetic signal, it means that an abnormality occurs when the control rod moves.

[0087] The simple method for measuring the position of the control rod of a dual - magnetic - coil reactor belongs to non - contact (ND) and direct rod - position measurement. Its principle is simple, and the reading and judgment algorithm is intuitive, which can effectively judge the working conditions of rod jamming, chain jamming, idle rotation, chain skipping, and chain slipping of the control rod. It is a relatively effective method for measuring the position of the control rod. At the same time, compared with the general electronics measurement device, the magnetic coil has higher radiation and temperature tolerance performance and stronger anti - shock and vibration resistance ability, and is suitable for environments with radiation, high temperature, and vibration such as reactors.

[0088] Embodiment 2

[0089] As Figure 6 shown, in this embodiment, a chain - type control rod drive system is provided. The chain - type control rod drive system includes the detection device of the control rod in the reactor in Embodiment 1.

[0090] In the control rod drive system provided by the present disclosure, by setting a non - contact abnormal detection device to obtain the magnetic flux information of the chain during movement and comparing it with the magnetic flux information during normal operation, thus by obtaining the magnetic flux information, the rod - position information during the movement of the control rod can be obtained intuitively, simply and effectively, and according to the comparison result, it is determined whether abnormal working conditions occur during the movement of the control rod. And through the non - contact detection method, direct contact with the chain and the control rod is avoided, so that the detected object will not be worn or damaged, and at the same time, the safety of the detection personnel is ensured.

[0091] Embodiment 3

[0092] As Figure 7 shown, in this embodiment, a detection method for the control rod in a reactor is provided. The detection method is implemented by using the detection device of the control rod in the reactor described in Embodiment 1. The detection method includes:

[0093] S11: Using the detection unit, the magnetic flux in the excitation coil will change due to the movement of the chain under actual working conditions;

[0094] S12: Obtain the corresponding actual magnetic signal information;

[0095] S13: Use the controller to determine the motion state of the control rod based on the magnetic signal information.

[0096] The detection method of the control rod in the reactor provided by the present disclosure is implemented based on the detection device of the control rod in the reactor. By setting a non-contact detection device, the magnetic flux information of the chain during movement is obtained and compared with the magnetic flux information during normal operation. Thus, by comparing the magnetic flux information, the rod position information of the control rod during movement can be obtained intuitively, simply and effectively, and whether an abnormal condition occurs during the movement of the control rod can be determined according to the comparison result. At the same time, through the non-contact detection method, direct contact with the chain and the control rod is avoided, so that the detected object will not be worn or damaged, and the safety of the detection personnel is also guaranteed.

[0097] Although the specific embodiments of the present disclosure have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present disclosure is defined by the appended claims. Without departing from the principles and essence of the present disclosure, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A detection device for control rods in a reactor, characterized in that, The detection device is applied in a chain-type control rod drive system, and the chain in the chain-type control rod drive system is driven by a drive mechanism to drive the movement of the control rod; The detection device includes a controller, an excitation coil, and a detection unit. The excitation coil and the detection unit are both fixedly arranged around the outer periphery of the chain and are respectively arranged along the extending direction of the chain, and the excitation coil and the detection unit are in parallel positions; After the excitation coil is powered on, the movement of the chain under actual working conditions will cause a change in the magnetic flux in the excitation coil; The detection unit is used to obtain corresponding actual magnetic signal information based on the change in the magnetic flux and send it to the controller; The controller is used to receive the actual magnetic signal information and determine the movement state of the control rod based on the magnetic signal information.

2. The detecting device for control rods in a reactor according to claim 1, wherein The actual magnetic signal information corresponds to a number of pulses, and one pulse corresponds to a preset length, and the preset length is the length of each link in the chain in the extending direction of the chain; The controller is further used to obtain the pulse number information in the actual magnetic signal information; Based on the pulse number information, calculate the moving distance corresponding to the chain to obtain the actual displacement of the control rod.

3. The detecting device for control rods in a reactor according to claim 2, characterized in that, The controller is further used to obtain the standard magnetic signal information corresponding to the distance when the chain moves the actual displacement under standard working conditions; In response to the inconsistency between the actual magnetic signal information and the standard magnetic signal information, it is determined that an abnormality occurs during the movement of the control rod, and the movement of the control rod is stopped; in response to the consistency between the actual magnetic signal information and the standard magnetic signal information, it is determined that no abnormality occurs to the control rod under the drive of the chain.

4. The detecting device for control rods in a reactor according to claim 3, characterized in that, The controller is further used to, in response to the inconsistency between the actual magnetic signal information and the standard magnetic signal information, compare the actual magnetic signal information with the standard magnetic signal information to obtain a comparison result, and determine the type of actual abnormal working condition corresponding to the control rod based on the comparison result.

5. The detection device for control rods in a reactor according to claim 4, characterized in that, The types of abnormal working conditions include control rod jamming, chain jamming, idling, chain skipping, or chain slipping.

6. The detection device for control rods in a reactor according to claim 1, characterized in that, The detection unit includes a first magnetic detector and a second magnetic detector; The first magnetic detector and the second magnetic detector are both arranged on one side of the excitation coil and are arranged in sequence away from the excitation coil, and are both fixedly arranged around the outer periphery of the chain and are respectively arranged along the extending direction of the chain; The first magnetic detector is used to obtain corresponding first actual magnetic signal information based on the change in the magnetic flux of the excitation coil; The second magnetic detector is used to obtain corresponding second actual magnetic signal information based on the change in the magnetic flux of the excitation coil; The controller is further used to obtain the first actual magnetic signal information and the first actual magnetic signal information; in response to the first actual magnetic signal information changing prior to the second actual magnetic signal information, it is determined that the control rod is in the rising state; in response to the second actual magnetic signal information changing prior to the first actual magnetic signal information, it is determined that the control rod is in the falling state.

7. The detecting device for control rods in a reactor according to any one of claims 1-6, characterized in that, The detection device further includes a compensation coil; The compensation coil is sleeved outside the chain and is in a parallel position with the excitation coil, and the detection unit is arranged between the compensation coil and the excitation coil.

8. The detecting device for control rods in a reactor according to claim 7, wherein, The detection device further includes a fixing frame; The excitation coil, the detection unit and the compensation coil are all arranged in parallel and fixedly arranged on the fixing frame, and the chain passes through the excitation coil, the detection unit and the compensation coil; and / or The detection device further includes an alarm unit, and the alarm unit is communicatively connected to the controller; The controller is further configured to generate a driving instruction when the movement of the control rod is abnormal, so as to drive the alarm unit to send an alarm reminder message.

9. A chain-type control rod drive system, characterized in that, The chain-type control rod drive system includes the detection device for the control rod in the reactor according to any one of claims 1-8.

10. A method for detecting control rods in a reactor, characterized in that, The detection method is implemented by using the detection device for the control rod in the reactor according to any one of claims 1-8, and the detection method includes: Using the detection unit, the magnetic flux in the excitation coil changes due to the movement of the chain under actual working conditions; Obtaining corresponding actual magnetic signal information; Using the controller to determine the movement state of the control rod based on the magnetic signal information.

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