阅读说明：本技术 堆芯选择器和堆芯中子注量率测量系统 (Reactor core selector and reactor core neutron fluence rate measurement system ) 是由 方勇 夏轶婧 张晨栋 杨鸿钧 梁彩荣 姜萍萍 禹晴 陈向 于 2020-12-31 设计创作，主要内容包括：本发明实施例公开了一种堆芯选择器和堆芯中子注量率测量系统,该堆芯选择器包括进线通道、固定部、通道选择模块、限位部和出线通道；进线通道固定于固定部上,通道选择模块包括电磁铁,电磁铁与第二段通道固定连接；限位部位于通道选择模块远离固定部的一侧,并与出线通道的入口端固定连接,进线通道的出口端位于限位部的内部；通道选择模块用于控制进线通道沿径向方向摆动,以控制进线通道的出口端与出线通道的一入口端对准。相对于现有技术,本发明实施例提供的技术方案无需使用步进电机驱动堆芯选择器,避免了步进电机驱动器因无法耐受大量辐射而影响堆芯选择器的可靠性的问题,且结构简单,易于安装和维护,降低了堆芯选择器的复杂性。(The embodiment of the invention discloses a reactor core selector and a reactor core neutron fluence rate measuring system, wherein the reactor core selector comprises an incoming line channel, a fixing part, a channel selection module, a limiting part and an outgoing line channel; the inlet wire channel is fixed on the fixing part, the channel selection module comprises an electromagnet, and the electromagnet is fixedly connected with the second section of channel; the limiting part is positioned on one side of the channel selection module, which is far away from the fixing part, and is fixedly connected with the inlet end of the wire outlet channel, and the outlet end of the wire inlet channel is positioned in the limiting part; the channel selection module is used for controlling the wire inlet channel to swing along the radial direction so as to control the outlet end of the wire inlet channel to be aligned with one inlet end of the wire outlet channel. Compared with the prior art, the technical scheme provided by the embodiment of the invention does not need to use a stepping motor to drive the reactor core selector, avoids the problem that the reliability of the reactor core selector is influenced because a stepping motor driver cannot tolerate a large amount of radiation, has a simple structure, is easy to install and maintain, and reduces the complexity of the reactor core selector.)

1. A core selector, comprising: the wire inlet channel, the fixing part, the channel selection module, the limiting part and the wire outlet channel are arranged on the base;

the inlet channel is fixed on the fixing part and comprises a first section of channel from an inlet end to the position where the fixing part fixes the inlet channel and a second section of channel from an outlet end to the position where the fixing part fixes the inlet channel, and the length of the first section of channel is smaller than that of the second section of channel;

the channel selection module comprises an electromagnet, and the electromagnet is fixedly connected with the second section of channel;

the limiting part is positioned on one side of the channel selection module, which is far away from the fixing part, and is fixedly connected with the inlet end of the wire outlet channel, and the outlet end of the wire inlet channel is positioned in the limiting part; the channel selection module is used for controlling the wire inlet channel to swing along the radial direction so as to control the outlet end of the wire inlet channel to be aligned with one inlet end of the wire outlet channel.

2. The core selector as set forth in claim 1 wherein the electromagnet is a dual retention electromagnet.

3. The core selector of claim 1 wherein the outlet channels comprise a first outlet channel and a second outlet channel, an outlet end of the inlet channel being aligned with an inlet end of the first outlet channel or an inlet end of the second outlet channel.

4. The core selector of claim 1 further comprising a limit switch sensor located on a side of the limit portion adjacent to the channel selection module.

5. The core selector as set forth in claim 4, wherein the limit switch sensors include a first limit switch sensor and a second limit switch sensor, the first limit switch sensor being disposed above the inlet passage in a radial direction and aligned with an upper limiting edge of the limiting portion;

the second limit switch sensor is arranged below the wire inlet channel and is aligned with the lower limiting edge of the limiting part.

6. The core selector of claim 5 wherein the channel selection module is located between the stationary portion and the limit switch sensor and is disposed proximate to the limit switch sensor.

7. The core selector of claim 3 wherein the outlet end of the first outlet channel is connected to a storage tank and the outlet end of the second outlet channel is connected to the core of the reactor.

8. A reactor core neutron fluence rate measurement system comprising a core selector as claimed in any of claims 1-7, the reactor core neutron fluence rate measurement system further comprising a drive means, a routing channel and an electrically operated valve, the core selector being adapted to provide a measurement path for a fission chamber to feed a detector through the drive means into a reactor core;

the driving device is connected with the inlet end of the inlet channel of the reactor core selector, the input end of the routing channel is connected with the outlet end of the outlet channel of the reactor core selector, and the output end of the routing channel is connected with the electric valve.

9. The in-core neutron fluence rate measurement system of claim 8, wherein the number of channels of the routing channel is in the range of 10-50.

10. The in-core neutron fluence rate measurement system of claim 8, further comprising a control module electrically connected to the channel selection module, wherein the control module is configured to receive the position signal of the inlet channel output by the core selector and control the electromagnet to be kept powered off according to the position signal of the inlet channel.

Technical Field

The embodiment of the invention relates to the technical field of nuclear power, in particular to a reactor core selector and a reactor core neutron fluence rate measuring system.

Background

The nuclear power plant reactor core neutron fluence rate measurement system is an important component in a nuclear power plant instrument system, is mainly used for measuring reactor core neutron fluence rate distribution and monitoring reactor core power distortion, and is of great importance to the safe operation of a nuclear power plant.

The reactor core selector is an important component of a reactor core neutron fluence rate measuring system, however, the whole reactor core selector in the prior art is complex and not beneficial to installation, and the safety and reliability of the reactor core selector are poor, so that the service life is greatly reduced.

Disclosure of Invention

The embodiment of the invention provides a reactor core selector and a reactor core neutron fluence rate measuring system, which are used for improving the operation safety and reliability of the reactor core selector, have simple structures and are convenient to install.

In a first aspect, embodiments of the present invention provide a core selector, comprising: the wire inlet channel, the fixing part, the channel selection module, the limiting part and the wire outlet channel are arranged on the base;

the inlet channel is fixed on the fixing part and comprises a first section of channel from an inlet end to the position where the fixing part fixes the inlet channel and a second section of channel from an outlet end to the position where the fixing part fixes the inlet channel, and the length of the first section of channel is smaller than that of the second section of channel;

the channel selection module comprises an electromagnet, and the electromagnet is fixedly connected with the second section of channel;

the limiting part is positioned on one side of the channel selection module, which is far away from the fixing part, and is fixedly connected with the inlet end of the wire outlet channel, and the outlet end of the wire inlet channel is positioned in the limiting part; the channel selection module is used for controlling the wire inlet channel to swing along the radial direction so as to control the outlet end of the wire inlet channel to be aligned with one inlet end of the wire outlet channel.

Optionally, the electromagnet is a dual-retention electromagnet.

Optionally, the outlet channel includes a first outlet channel and a second outlet channel, and an outlet end of the inlet channel is aligned with an inlet end of the first outlet channel or an inlet end of the second outlet channel.

Optionally, the core selector further comprises a limit switch sensor located at a side of the limit part close to the channel selection module.

Optionally, the limit switch sensor includes a first limit switch sensor and a second limit switch sensor, and the first limit switch sensor is disposed above the wire inlet channel and aligned with the upper limiting edge of the limiting portion along the radial direction;

the second limit switch sensor is arranged below the wire inlet channel and is aligned with the lower limiting edge of the limiting part.

Optionally, the channel selection module is located between the fixing portion and the limit switch sensor, and is disposed close to the limit switch sensor.

Optionally, an outlet end of the first outlet channel is connected with the storage tank, and an outlet end of the second outlet channel is connected with a core of the reactor.

In a second aspect, an embodiment of the present invention further provides a reactor core neutron fluence rate measurement system, which includes the reactor core selector provided in any embodiment of the present invention, the reactor core neutron fluence rate measurement system further includes a driving device, a routing channel and an electric valve, the reactor core selector is configured to provide a measurement path for the fission chamber, so as to send the detector into the reactor core through the driving device;

the driving device is connected with the inlet end of the inlet channel of the reactor core selector, the input end of the routing channel is connected with the outlet end of the outlet channel of the reactor core selector, and the output end of the routing channel is connected with the electric valve.

Optionally, the number of the routing channels ranges from 10 to 50.

Optionally, the reactor core neutron fluence rate measurement system further comprises a control module, the control module is electrically connected with the channel selection module, and the control module is configured to receive the position signal of the inlet line channel output by the reactor core selector, and control the electromagnet to be kept in a power-off state according to the position signal of the inlet line channel.

According to the technical scheme provided by the embodiment of the invention, the fixing part, the channel selection module and the limiting part are arranged, so that the inlet channel can select different outlet channels, and the fission chamber detector can be flexibly output. The channel selection module comprises an electromagnet, the second section of channel of the wire inlet channel is driven to swing along the radial direction by the electromagnet, and the outlet end of the wire inlet channel can be accurately aligned with the inlet end of the wire outlet channel under the limiting action of the limiting part. In the prior art, the technical scheme provided by the embodiment of the invention does not need to use a stepping motor to drive the reactor core selector, so that the problem that the reliability of the reactor core selector is influenced because a stepping motor driver cannot tolerate a large amount of radiation is solved, the electromagnet does not relate to an electronic device, the operation reliability of the reactor core selector can be improved by using the electromagnet, the structure is simple, the electromagnet is easy to install and maintain, the complexity of the reactor core selector is reduced, the space occupied by the reactor core selector in a containment vessel is smaller, and the space for safely walking in the containment vessel is improved.

Drawings

FIG. 1 is a schematic structural view of a core selector according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of another core selector according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a restriction portion along a radial direction according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a reactor core neutron fluence rate measurement system according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another reactor core neutron fluence rate measurement system provided by the embodiment of the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

As described in the background, the core selector in the prior art has a problem of poor operational safety and reliability. The applicant has found through careful study that the above problems occur because: in the prior art, a core selector is usually driven by a stepping motor and is located in a containment vessel of a nuclear power plant, so that a large amount of radiation particles exist in the environment where the core selector is located, and the operating reliability of the core selector is reduced due to the fact that a driver of the stepping motor cannot resist a large amount of radiation, so that the service life of the core selector is influenced. In addition, step motor takes place the step-out phenomenon easily, need restore to the precision to it after step motor step-out, and this structure that just makes whole reactor core selector is comparatively complicated, is unfavorable for the installation and the maintenance of equipment.

In view of the above problems, embodiments of the present invention provide a core selector, which is simple in structure and convenient to install, and can improve the operational safety and reliability of the core selector. Fig. 1 is a schematic structural diagram of a core selector according to an embodiment of the present invention, and referring to fig. 1, the core selector according to the embodiment of the present invention includes an inlet channel 10, a fixing portion 20, a channel selection module 30, a limiting portion 40, and an outlet channel 50; the inlet channel 10 is fixed on the fixing part 20, the inlet channel 10 comprises a first section of channel 101 from an inlet end A to the position where the fixing part 20 fixes the inlet channel 10, and a second section of channel 102 from an outlet end B to the position where the fixing part 20 fixes the inlet channel 10, and the length of the first section of channel 101 is smaller than that of the second section of channel 102; the channel selection module 30 comprises an electromagnet 301, and the electromagnet 301 is fixedly connected with the second section of channel 102; the limiting part 40 is located on one side of the channel selection module 30 far away from the fixing part 20 and is fixedly connected with the inlet end of the wire outlet channel 50, and the outlet end B of the wire inlet channel 10 is located inside the limiting part 40; the channel selection module 30 is used to control the incoming channel 10 to swing in the radial direction to control the outlet end B of the incoming channel 10 to align with an inlet end of the outgoing channel 50.

Specifically, the reactor core neutron fluence rate measurement system is an important component of a nuclear power station monitoring system, and mainly uses a miniature fission chamber detector to measure the neutron fluence rate distribution of a reactor core of a reactor, detect the power distortion of the reactor core and accumulate burnup data, so that the system is important for safe and reliable starting and operation of the nuclear power station and influences the operation safety and economy of the nuclear power station. Most importantly, if the reactor core measuring system cannot operate normally, the nuclear power station becomes a furnishing and cannot start power generation. And when the fission chamber detector measures the neutron fluence rate distribution of the reactor core, the data of the neutron flux at each position in the reactor needs to be measured, and finally the required fluence rate distribution is synthesized. The core selector is primarily to provide a path for the fission chamber to enable the fission chamber detector to enter each active area of the reactor core to measure the core neutron fluence rate, and thus, the core selector's placement is very important.

The inlet channel 10 is an inlet channel of the fission chamber, the fission chamber detector enters from an inlet end a of the inlet channel 10 and outputs from an outlet end B thereof, wherein the inlet channel 10 has certain elasticity, so that the channel selection module 30 can drive the inlet channel 10 to swing. The inlet channel 10 is fixed by a fixing portion 20, for example, to a wall of a containment vessel of a nuclear power plant. The fixing part 20 divides the inlet channel 10 into two parts, one part is a first section channel 101 from the inlet end A of the inlet channel 10 to the position where the fixing part 20 fixes the inlet channel 20, the second part is a second section channel 102 from the outlet end B to the position where the fixing part 20 fixes the inlet channel 20, the length of the first section channel 101 is smaller than that of the second section channel 102, and the channel selection module 30 is fixed on the second section channel 102. Because the inlet channel 10 has elasticity, it can be known from the lever principle that the deformation amount of the second channel 102 with a longer length is larger, so that the outlet end B of the inlet channel 10 is easier to align with an inlet end of the outlet channel 50 under the action of the channel selection module 30, and the fission chamber detector can select different outlet channels 50 to output to the reactor core of the reactor.

The channel selection module 30 is used to provide power to the incoming channel 10, so that the second section of channel 102 of the incoming channel 10 can swing in the radial direction within its own elastic range, thereby controlling the outlet end B of the incoming channel 10 to align with an inlet end of the outgoing channel 50. The channel selection module 30 includes an electromagnet 301, and the electromagnet 301 generates power in different directions according to different polarities of voltages applied to the electromagnet 301, so as to control the second section of the channel 102 of the incoming line channel 10 to swing up and down in the radial direction. The limiting part 40 limits the maximum swing position of the outlet end of the wire inlet channel 10, and fixes the inlet end of the wire outlet channel 50, so that the accuracy of selecting different wire outlet channels 50 by the wire inlet channel 10 can be guaranteed. Illustratively, a positive voltage is applied to the electromagnet 301, the electromagnet 301 extends out of the shaft, the wire inlet channel 10 is pushed upwards along the radial direction, and the outlet end B of the wire inlet channel 10 is aligned with the wire outlet channel 50 with the inlet end C1 fixed on the limiting part 40; when a reverse voltage is applied to the electromagnet 301, the electromagnet 301 contracts to pull the wire inlet channel 10 downward along the radial direction, and the outlet end B of the wire inlet channel 10 is aligned with the wire outlet channel 50 with the inlet end D1 fixed to the limiting portion 40.

According to the technical scheme provided by the embodiment of the invention, the fixing part, the channel selection module and the limiting part are arranged, so that the inlet channel can select different outlet channels, and the fission chamber detector can be flexibly output. The channel selection module comprises an electromagnet, the second section of channel of the wire inlet channel is driven to swing along the radial direction by the electromagnet, and the outlet end of the wire inlet channel can be accurately aligned with the inlet end of the wire outlet channel under the limiting action of the limiting part. In the prior art, the technical scheme provided by the embodiment of the invention does not need to use a stepping motor to drive the reactor core selector, so that the problem that the reliability of the reactor core selector is influenced because a stepping motor driver cannot tolerate a large amount of radiation is solved, the electromagnet does not relate to an electronic device, the operation reliability of the reactor core selector can be improved by using the electromagnet, the structure is simple, the electromagnet is easy to install and maintain, the complexity of the reactor core selector is reduced, the space occupied by the reactor core selector in a containment vessel is smaller, and the space for safely walking in the containment vessel is improved.

As an alternative to the embodiment of the present invention, with continued reference to fig. 1, the outlet channel 50 comprises a first outlet channel 501 and a second outlet channel 502, the outlet end B of the inlet channel 10 being aligned with the inlet end D1 of the first outlet channel 501 or the inlet end C1 of the second outlet channel 502.

Specifically, the present embodiment will be described by taking the core selector as a one-to-two selector as an example. For powering the inlet channel 10 so that the second section channel 102 of the inlet channel 10 can swing in the radial direction within its own elastic range, thereby controlling the outlet end B of the inlet channel 10 to align with the inlet end D1 of the first outlet channel 501 or the inlet end C1 of the second outlet channel 502. The electromagnet 301 can be a double-holding electromagnet, the double-holding electromagnet belongs to a push-pull electromagnet, a permanent magnet is arranged in the double-holding electromagnet, the double-holding electromagnet is fixedly connected with the second section of channel 102 of the wire inlet channel 10 through a pull rod, when voltage is applied to the double-holding electromagnet, the pull rod can move under the action of an electromagnetic field and finally stop at the terminal position, and after a power supply is cut off, the pull rod can be kept unchanged at the terminal position through the magnetic force of the permanent magnet; the pull rod will return when a reverse voltage is applied to the dual retention magnets. Illustratively, when a positive voltage is applied to the electromagnet 301, the electromagnet 301 performs an extending shaft action, the wire inlet channel 10 is pushed upwards along the radial direction, the outlet end B of the wire inlet channel 10 is aligned with the inlet end C1 of the second wire outlet channel 502, the fission chamber detector is output through the wire inlet channel 10 and the second wire outlet channel 502, and after the power supply is cut off, the electromagnet 301 can still maintain the extending shaft action. When a reverse voltage is applied to the electromagnet 301, the electromagnet 301 contracts and pulls the wire inlet channel 10 downwards along the radial direction, the outlet end B of the wire inlet channel 10 is aligned with the inlet end D1 of the first wire outlet channel 501, the fission chamber detector outputs through the wire inlet channel 10 and the first wire outlet channel 501, and after the power supply is cut off, the electromagnet 301 can still keep contracting. Compared with the scheme that the stepping motor is adopted to drive the reactor core selector in the prior art, the technical scheme provided by the embodiment of the invention avoids the problem that the reliability of the reactor core selector is influenced because the stepping motor driver cannot tolerate a large amount of radiation, the operation reliability of the reactor core selector can be improved by using the electromagnet because the electromagnet does not relate to an electronic device, the direction and strength of the magnetic force can be changed by only controlling the polarity and the magnitude of the voltage, and then different outlet channels are selected.

As another alternative implementation manner of the embodiment of the invention, fig. 2 is a schematic structural diagram of another core selector provided in the embodiment of the invention, and referring to fig. 2, on the basis of the above technical solutions, the core selector further includes a limit switch sensor 60 located on one side of the limit portion 40 close to the channel selection module 30.

Specifically, the limit switch sensor 60 is configured to generate a position signal of the incoming line channel 10, when the outlet end B of the incoming line channel 10 aligns with the inlet end of an outgoing line channel 50, the limit switch sensor 60 generates a position signal of the incoming line channel 10, and a power control system (not shown in the figure) may cut off the power supply according to the received position signal, and stop supplying power to the electromagnet 301, and because the electromagnet 301 is a dual-holding electromagnet, the outlet end B of the incoming line channel 10 can still maintain the state of aligning with the inlet end of the outgoing line channel 50.

Wherein, the limit switch sensor 60 comprises a first limit switch sensor 601 and a second limit switch sensor 602, and in the radial direction, the first limit switch sensor 601 is arranged above the incoming line channel 10 and is aligned with the upper limiting edge 401 of the limiting part 40; the second limit switch sensor 602 is disposed below the inlet channel 10 and is aligned with the lower limiting edge 402 of the limiting portion 40.

Specifically, fig. 3 is a schematic cross-sectional structure view of a limiting part provided in an embodiment of the present invention along a radial direction, referring to fig. 2 and fig. 3, the limiting part 40 includes an inlet end E1, a first outlet end E2, and a second outlet end E3 that are communicated with each other, the first outlet channel 501 is fixed in the first outlet end E2, the second outlet channel 502 is fixed in the second outlet end E3, and the outlet end B of the inlet channel 10 is located in the inlet end E1 of the limiting part 40 and can swing up and down therein. The upper limiting edge 401 and the lower limiting edge 402 of the limiting part 40 form a limiting structure for the inlet channel 10, so that the maximum amplitude of the swing of the outlet end B of the inlet channel 10 in the radial direction is limited, that is, the farthest position of the swing of the outlet end B of the inlet channel 10 upwards is a position in contact with the upper limiting edge 401 of the limiting part 40, and the farthest position of the swing downwards is a position in contact with the lower limiting edge 402 of the limiting part 40. When a positive voltage is applied to the electromagnet 301, so that the electromagnet 301 does an extending shaft action, the wire inlet channel 10 is pushed upwards along the radial direction, and the outlet end B of the wire inlet channel 10 is aligned with the inlet end C1 of the second wire outlet channel 502, the outlet end B of the wire inlet channel 10 just contacts with the upper limiting edge 401 of the limiting part 40, meanwhile, the second section channel 102 of the wire inlet channel 10 just contacts with the first limiting switch sensor 601, the first limiting switch sensor 601 outputs a position signal of the wire inlet channel 10, and the control system can cut off the power supply according to the received position signal. When the outlet end B of the wire inlet channel 10 needs to be aligned with the first wire outlet channel 501, the control system controls the voltage applied to the electromagnet 301 to be a reverse voltage, so that the electromagnet 301 contracts to pull the wire inlet channel 10 downwards along the radial direction, when the outlet end B of the wire inlet channel 10 is aligned with the inlet end D1 of the first wire outlet channel 501, the outlet end B of the wire inlet channel 10 just contacts with the lower limiting edge 402 of the limiting part 40, meanwhile, the second section of channel 102 of the wire inlet channel 10 just contacts with the second limit switch sensor 602, the second limit switch sensor 602 outputs a position signal of the wire inlet channel 10, and the control system can cut off the power supply according to the received position signal. In the embodiment, by adopting the double-holding electromagnet and outputting the position signal of the wire inlet channel 10 through the limit switch sensor 60, and cutting off the power supply of the double-holding electromagnet when the limit switch sensor 60 outputs the position signal of the wire inlet channel 10, the system is beneficial to saving electric energy when running for a long time.

Alternatively, with continued reference to fig. 2, the channel selection module 30 is located between the fixture 20 and the limit switch sensor 60 and is disposed proximate to the limit switch sensor 60.

Specifically, the advantage of such an arrangement is that, because the incoming line channel 10 has a certain elasticity, when the channel selection module 30 is fixed at the outlet end B close to the incoming line channel 10, the incoming line channel 10 can be pushed and pulled with a small power to swing along the radial direction, and meanwhile, the channel selection module 30 is arranged at one side of the limit switch sensor 60 away from the outlet end B of the incoming line channel 10, so as to ensure that the position signal of the incoming line channel 10 can be accurately output by the limit switch sensor 60 when the outlet end B of the incoming line channel 10 is aligned with the first outgoing line channel 501 or the second outgoing line channel 502.

Optionally, in the embodiment of the present invention, the outlet end D2 of the first outlet channel 501 is connected to the storage tank, and the outlet end C2 of the second outlet channel 502 is connected to the core of the reactor, so as to realize flexible selection of the alignment of the inlet channel 10 and the different outlet channels 50, to send the fission chamber detector into the core of the reactor for measurement, or to store the fission chamber detector in the storage tank.

According to the technical scheme provided by the embodiment of the invention, the fixing part, the channel selection module and the limiting part are arranged, so that the inlet channel can select different outlet channels, and the fission chamber detector can be flexibly output. The channel selection module comprises an electromagnet, the second section of channel of the wire inlet channel is driven to swing along the radial direction by the electromagnet, and the outlet end of the wire inlet channel can be accurately aligned with the inlet end of the wire outlet channel under the limiting action of the limiting part. In the prior art, the technical scheme provided by the embodiment of the invention does not need to use a stepping motor to drive the reactor core selector, so that the problem that the reliability of the reactor core selector is influenced because a stepping motor driver cannot tolerate a large amount of radiation is solved, the electromagnet does not relate to an electronic device, the operation reliability of the reactor core selector can be improved by using the electromagnet, the structure is simple, the electromagnet is easy to install and maintain, the complexity of the reactor core selector is reduced, the space occupied by the reactor core selector in a containment vessel is smaller, and the space for safely walking in the containment vessel is improved.

Optionally, an embodiment of the present invention further provides a reactor core neutron fluence rate measurement system, including the reactor core selector provided in any embodiment of the present invention. Fig. 4 is a schematic structural diagram of a reactor core neutron fluence rate measuring system provided by an embodiment of the invention, and referring to fig. 2 and fig. 4, on the basis of the above technical solutions, the reactor core neutron fluence rate measuring system further includes a driving device 100, a gate channel 400 and an electric valve 500, and the reactor core selector 200 is configured to provide a measuring path for the fission chamber to send the detector into the reactor core through the driving device 100; the driving device 100 is connected to the inlet end a of the inlet channel 10 of the core selector 200, the input end of the routing channel 400 is connected to the outlet end of the outlet channel 50 of the core selector 200, and the output end of the routing channel 400 is connected to the electric valve 500.

Specifically, the reactor generates neutrons in the fission chamber based on self-sustained fission reaction, and the neutron fluence rate is measured by a reactor core neutron fluence rate measurement system to monitor whether the core power is distorted, and is generally measured by a miniature fission chamber detector. The driving device 100 provides power for the detector, drives the detector to enter the inlet channel 10 of the core selector 200, and after the core selector 200 selects an output path, the detector can be output to the gate channel 400 from the outlet end D2 of the first outlet channel 501 of the core selector 200, or can be output to the storage tank 300 for storage from the outlet end C2 of the second outlet channel 502 of the core selector 200. Each driving device 100 is connected with the core selector 200 in a one-to-one correspondence manner, and the routing channel 400 routes the detector at the input end thereof and sends the detector into the core of the reactor through the electric valve 500. The number range of the channels of the routing channel 400 is 10-50, for example, the number of the channels of the routing channel 400 is 30, the routing channel 400 further selects the detector output by the reactor core selector 200, and the electrically operated valve 500 controls the output end of the routing channel 400 to output the detector to enter the reactor core for measuring the neutron fluence rate.

It should be noted that the driving device 100, the core selector 200, the reservoir tank 300, the gate passage 400, and the electric valve 500 are all connected by pipes as described in the embodiment of the present invention.

Optionally, fig. 5 is a schematic structural diagram of another reactor core neutron fluence rate measuring system provided in an embodiment of the present invention, and referring to fig. 2 and fig. 5, based on the above technical solutions, the reactor core neutron fluence rate measuring system provided in an embodiment of the present invention further includes a control module 600, the control module 600 is electrically connected to the channel selection module 30, and the control module 600 is configured to receive a position signal of the inlet channel 10 output by the reactor core selector 200, and control the electromagnet 301 to be kept powered off according to the position signal of the inlet channel 10.

Specifically, the control module 600 may be disposed in the primary enclosure for controlling the in-core neutron fluence rate measurement system, such as powering the channel selection module 30 on and off. When a positive voltage is applied to the electromagnet 301, so that the electromagnet 301 extends out of the shaft, the wire inlet channel 10 is pushed upwards along the radial direction, and the outlet end B of the wire inlet channel 10 is aligned with the inlet end C1 of the second wire outlet channel 502, the outlet end B of the wire inlet channel 10 just contacts with the upper limiting edge 401 of the limiting portion 40, meanwhile, the second section channel 102 of the wire inlet channel 10 just contacts with the first limit switch sensor 601, the first limit switch sensor 601 outputs a position signal of the wire inlet channel 10, and the control module 600 can cut off the power supply according to the received position signal. When the outlet end B of the wire inlet channel 10 needs to be aligned with the first wire outlet channel 501, the control module 600 controls the voltage applied to the electromagnet 301 to be a reverse voltage, so that the electromagnet 301 contracts to pull the wire inlet channel 10 downwards along the radial direction, when the outlet end B of the wire inlet channel 10 is aligned with the inlet end D1 of the first wire outlet channel 501, the outlet end B of the wire inlet channel 10 just contacts with the lower limiting edge 402 of the limiting part 40, meanwhile, the second section channel 102 of the wire inlet channel 10 just contacts with the second limit switch sensor 602, the second limit switch sensor 602 outputs a position signal of the wire inlet channel 10, and the control module 600 can cut off the power supply according to the received position signal.

According to the technical scheme provided by the embodiment of the invention, the reactor core selector is optimally designed, a stepping motor is not required to be used for driving the reactor core selector, the problem that the reliability of the reactor core selector is influenced because a stepping motor driver cannot tolerate a large amount of radiation is avoided, and the electromagnet does not relate to an electronic device, so that the operation reliability of the reactor core selector can be improved by using the electromagnet, the structure is simple, the installation and the maintenance are easy, the complexity of the reactor core selector is reduced, and the complexity of a reactor core neutron fluence rate measuring system is reduced.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.