CN219349807U

CN219349807U - Device suitable for monitoring neutron fluence rate of fuel assembly in reactor core

Info

Publication number: CN219349807U
Application number: CN202223534805.3U
Authority: CN
Inventors: 刘兴华; 潘国义; 林伟; 王建英; 余洪扬
Original assignee: Chengdu Maiwei Nuclear Monitoring Technology Co ltd
Current assignee: Chengdu Maiwei Nuclear Monitoring Technology Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-07-14
Anticipated expiration: 2032-12-29

Abstract

The utility model relates to the technical field of nuclear radiation measurement, and particularly provides a device suitable for monitoring neutron fluence rate of a fuel assembly in a reactor core, which comprises a detection unit and a measurement channel chassis; the detection unit is used for detecting neutron fluence rate; the measuring channel case comprises an LED display unit which is in signal connection with the detection unit and is used for displaying measurement information of the detection unit, the change of neutron fluence rate in a reactor core during the loading period of the nuclear reactor is monitored in real time through the detection unit by aiming at the structural design of the device, and the change is displayed by the LED display unit, so that real-time monitoring and display are realized, and the loading safety of a system is ensured.

Description

Device suitable for monitoring neutron fluence rate of fuel assembly in reactor core

Technical Field

The utility model relates to the technical field of nuclear radiation measurement, in particular to a device suitable for monitoring neutron fluence rate of a fuel assembly in a reactor core.

Background

The core of a nuclear reactor consists of fuel assemblies, cooling water and control rods. The fuel assemblies are immersed in the cooling water in the core in a grid arrangement, and the distance from the bottom of the core to the ground working area exceeds 20 meters.

During loading of a nuclear reactor core, the neutron fluence rate in the core needs to be monitored in real time, and the system loading safety is ensured by monitoring the change of the neutron fluence rate in the core during the loading of the nuclear reactor in real time.

In view of this, the present application is specifically proposed.

Disclosure of Invention

Aiming at the problem of how to ensure the safety of the system charge in the prior art, the embodiment of the utility model provides a device suitable for monitoring the neutron fluence rate of a fuel assembly in a reactor core.

The embodiment of the utility model is realized by the following technical scheme:

the embodiment of the utility model provides a device suitable for monitoring neutron fluence rate of a fuel assembly in a reactor core, which comprises a detection unit and a measurement channel chassis; the detection unit is used for detecting neutron fluence rate; the measuring channel case comprises an LED display unit which is in signal connection with the detection unit and is used for displaying the measuring information of the detection unit.

In this scheme, the device includes detection unit and measuring channel machine case, wherein the measuring channel machine case includes the LED display element, the LED display element with detection unit signal connection is used for receiving the test signal that the detection unit measured shows, through the structural design to the device, through the change of neutron fluence rate in the reactor core during the detection unit real-time supervision nuclear reactor loading to by the LED display element shows, thereby realize real-time supervision and demonstration, guarantee system loading safety.

Further, the measurement channel chassis further comprises a comparison module, and the comparison module is in signal connection with the detection unit and is used for comparing measurement information.

Further, the device also comprises an alarm module, wherein the alarm module is in signal connection with the comparison module, and when the measurement information received by the comparison module exceeds a threshold value, the alarm module sends an alarm signal.

Further, the alarm module comprises an audible alarm module and a visual alarm module.

Further, the detection unit comprises a plurality of neutron detectors, the neutron detectors are of columnar structures, the neutron detectors comprise detection heads and connecting rods, the detection heads are arranged at one ends of the connecting rods, lifting ring structures are arranged at the other ends of the connecting rods, and the lifting ring structures are used for being connected with external devices and used for achieving release of the neutron detectors.

Further, the diameter of the connecting rod is smaller than the diameter of the probe.

Further, the axis of the connecting rod is arranged in line with the axis of the probe.

Further, the diameter of the probe is less than 25cm.

Further, the measurement channel case is provided with an inner cavity, and a placing frame for placing the detection unit is arranged in the inner cavity.

Further, the measuring channel case is provided with a universal wheel structure.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

the embodiment of the utility model provides a device suitable for monitoring neutron fluence rate in a reactor core fuel assembly, which comprises a detection unit and a measurement channel chassis, wherein the measurement channel chassis comprises an LED display unit, the LED display unit is in signal connection with the detection unit and is used for receiving and displaying a test signal measured by the detection unit, and the change of the neutron fluence rate in the reactor core during the loading of a nuclear reactor is monitored in real time through the detection unit by aiming at the structural design of the device and is displayed by the LED display unit, so that the real-time monitoring and displaying are realized, and the loading safety of a system is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model. In the drawings:

FIG. 1 is a schematic diagram of an apparatus for monitoring neutron fluence rate in a fuel assembly in a core according to an embodiment of the utility model;

fig. 2 is a schematic structural diagram of a neutron detector according to an embodiment of the present utility model.

In the drawings, the reference numerals and corresponding part names:

110-connecting rod, 120-detecting head, 130-hanging ring.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the utility model. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order not to obscure the utility model.

Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the utility model. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the description of the present utility model, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present utility model.

Examples

As shown in fig. 1, an embodiment of the present utility model provides a device for monitoring neutron fluence rate in a fuel assembly in a reactor core, including a detection unit and a measurement channel chassis; the detection unit is used for detecting neutron fluence rate; the measuring channel case comprises an LED display unit which is in signal connection with the detection unit and is used for displaying the measuring information of the detection unit.

The LED display unit is in signal connection with the detection unit, and is used for displaying measurement information of the detection unit, and specifically, the signal connection mode includes, but is not limited to, wired connection, and signal transmission can also be realized by adopting a wireless connection mode.

In some embodiments, the measurement channel chassis further includes a comparison module, which is in signal connection with the detection unit, for implementing comparison of measurement information.

The neutron fluence rate monitoring device comprises a comparison module, a neutron fluence rate monitoring module and a neutron fluence rate monitoring module, wherein the neutron fluence rate can be obtained and compared through the arrangement of the comparison module, and specifically, the comparison module can preset a threshold value and compare the difference between an actual measured value and the threshold value through the preset threshold value, so that the neutron fluence rate can be effectively monitored.

Specifically, the comparison module is further provided with an input module, and the input module can realize the presetting of the threshold value in an active input mode.

In some embodiments, the system further comprises an alarm module, wherein the alarm module is in signal connection with the comparison module, and the alarm module sends an alarm signal when the measurement information received by the comparison module exceeds a threshold value.

Specifically, through the setting of audible alarm module and light alarm module, audible and visual alarm signal can be sent to can effectually remind.

It should be noted that, as a person skilled in the art should know, for the measurement channel chassis, the measurement channel chassis should include a main board, where the main board is connected to the detection unit through a signal transmission module, and the comparison module is disposed on the main board, so as to implement comparing a signal detected by the detection unit with a threshold value.

As shown in fig. 2, in some embodiments, the detecting unit includes a plurality of neutron detectors, where the neutron detectors are in a columnar structure, and the neutron detectors include a detecting head 120 and a connecting rod 110, where the detecting head 120 is disposed at one end of the connecting rod 110, and a hanging ring 130 structure is disposed at the other end of the connecting rod 110, where the hanging ring 130 structure is used for being connected with an external device, and used for realizing release of the neutron detectors.

In particular, as will be appreciated by those skilled in the art, the detection unit includes a plurality of neutron detectors, which are 3He neutron detectors.

In some embodiments, the diameter of the connecting rod 110 is smaller than the diameter of the probe 120.

Specifically, the diameter of the connecting rod 110 is smaller than that of the detecting head 120, and the neutron detector is in a columnar structure, so that the stability of the whole neutron detector can be ensured through structural design, thereby facilitating the placement of the neutron detector.

In some embodiments, the axis of the connecting rod 110 is disposed collinear with the axis of the probe 120.

Specifically, the two are arranged in a collinear way, so that the stability of the columnar structure can be effectively guaranteed.

In some embodiments, the probe 120 has a diameter of less than 25cm.

In the prior art, a conventional manner of monitoring the neutron fluence rate of the fuel assembly in the core is to place a region monitoring device for monitoring the neutron fluence rate at a point in the core. Since the activity of detected neutrons is inversely proportional to the square of the distance, this approach allows the detector of the neutron region monitoring device to monitor a lower neutron sensitivity the farther from the fuel assembly. The change of neutron fluence rate generated by the fuel assemblies in the reactor core cannot be timely and accurately fed back, and the diameter of the neutron region monitoring equipment is generally not more than 25cm because of smaller space between the fuel assemblies in the reactor core, so that the conventional neutron region monitoring equipment cannot be placed in a narrow gap of the fuel assemblies. The fuel assemblies in the core are covered with cooling water, and from the viewpoint of safety, no other equipment can be provided in the core before the fuel assemblies are assembled, and the operation needs to be performed after the fuel assemblies are assembled. Conventional neutron field monitoring devices do not have the ability to place the monitoring device from above the water into the gap of the fuel assembly under water, and because of this, the diameter of the probe head 120 is set to a smaller configuration, thereby facilitating placement of the probe head 120 into the middle of the core fuel assembly.

In some embodiments, to facilitate placement of the neutron detector and to enable measurement for different measurement depths, a counterweight may be added to the assembly structure, specifically, for example, a hanging ring 130 is disposed at an end of the connecting rod 110, so as to facilitate installation of the counterweight.

In some embodiments, the measurement channel chassis has an interior cavity in which a rack for placing the detection unit is disposed.

In some embodiments, the measurement channel chassis is provided with a gimbal structure.

Specifically, the universal wheel structure is arranged, so that the movement of the measuring channel case is facilitated.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims

1. An apparatus for neutron fluence rate monitoring in a fuel assembly in a core, comprising,

the detection unit is used for measuring the channel chassis;

the detection unit is used for detecting neutron fluence rate;

the measuring channel case comprises an LED display unit which is in signal connection with the detection unit and is used for displaying the measuring information of the detection unit.

2. The device for monitoring the neutron fluence rate of the fuel assembly in the reactor core of claim 1, wherein the measuring channel case further comprises a comparison module which is in signal connection with the detection unit and is used for comparing measurement information.

3. The device for monitoring the neutron fluence rate of the fuel assembly in the reactor core of claim 2, further comprising an alarm module in signal connection with the comparison module, wherein the alarm module sends an alarm signal when the measurement information received by the comparison module exceeds a threshold value.

4. The apparatus of claim 3, wherein the alarm module comprises an audible alarm module and a visual alarm module.

5. The apparatus of any one of claims 1-4, wherein the detection unit comprises a plurality of neutron detectors, the neutron detectors are in a columnar structure, the neutron detectors comprise a detector head and a connecting rod, the detector head is arranged at one end of the connecting rod, a lifting ring structure is arranged at the other end of the connecting rod, and the lifting ring structure is used for being connected with an external device and realizing release of the neutron detectors.

6. The apparatus of claim 5 wherein the connecting rod has a diameter less than the diameter of the probe head.

7. The apparatus of claim 5 wherein the axis of the connecting rod is disposed co-linearly with the axis of the probe.

8. The apparatus of claim 5 wherein the probe has a diameter of less than 25cm.

9. The apparatus of claim 1, wherein the measurement channel chassis has an interior cavity in which a rack for receiving the detection unit is disposed.

10. The apparatus of claim 9 wherein the measurement channel chassis is provided with a gimbal structure.