Device for neutron flux distribution detection

Abstract

The utility model relates to the technical field of reactor detection, in particular to a device for neutron flux distribution detection, which comprises a supporting plate, a plurality of detector fixing grooves arranged in a multi-row matrix are uniformly arranged on the supporting plate, one end of each detector fixing groove is provided with a cable groove, and the other end of each detector fixing groove is provided with a cable. According to the utility model, the housing of the collection body is cylindrical, so that external pressure can be uniformly dispersed to each position, and the detection body is arranged in each detector fixing groove through braze welding, and the transmission cable is arranged at the rear end of each detector body, and is fixed in the cable groove through braze welding. According to the neutron flux distribution detector, the pressure resistance of the detectors is improved, the multiple detectors are fixed to the supporting plate in a multi-row matrix mode to form a whole, online measurement of neutron flux distribution in a fuel element can be more accurately carried out, the installation positions of the detectors are fixed, the detection positions are accurate, and therefore the position resolution precision of flux distribution detection is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to reactor detection technical field, concretely relates to a device for neutron flux distribution detection. BACKGROUND

[0002] In nuclear reactor, the distribution of neutron flux is closely related to the fission reaction rate of nuclear fuel. By monitoring the neutron flux distribution, the non-uniformity of neutron flux in the reactor core can be found in time, thereby preventing the overheating of fuel elements caused by excessive local neutron flux, avoiding the damage of fuel elements, and ensuring the safe operation of the reactor. If the neutron flux distribution changes abnormally, it may mean the occurrence of dangerous situations such as loss of reactivity control, so a technical solution is needed for the detection of neutron flux distribution in the reactor core.

[0003] Self-powered neutron detector, as a new type of detector, is the main detection element for online monitoring of neutron flux in nuclear reactor, used for in-core neutron flux measurement, reflecting the power density and distribution of the reactor core, and ensuring the safe and effective operation of the nuclear reactor.

[0004] Generally, using self-powered neutron detector for in-core neutron flux distribution measurement requires that multiple detectors be inserted into the core one by one, and then detection work is carried out after arrangement. The distribution detection method is complex to operate and has a long detection period. Moreover, since the position of the detector is not fixed, the detection position is not accurate, reducing the position resolution of the detection. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above-mentioned problems and provides a device for neutron flux distribution detection with simple structure and reasonable design.

[0006] The utility model realizes the above-mentioned purposes through the following technical solutions:

[0007] A device for neutron flux distribution detection, comprising a supporting plate for auxiliary fixation and a plurality of detector bodies, the supporting plate is fixedly connected with a plurality of detector bodies, and the supporting plate and the plurality of detector bodies constitute a device for neutron flux distribution detection;

[0008] A plurality of detector fixing grooves arranged in multiple rows in matrix are uniformly formed on the supporting plate, a cable groove is formed at one end of each detector fixing groove, a detector body is welded by brazing in the inside of each detector fixing groove, a transmission cable is arranged at the rear end of the detector body, and the transmission cable is fixed in the cable groove by brazing.

[0009] Preferably, the detector body is composed of a probe, a transmission cable and a rear-end electronic system, and the probe in the detector body is cylindrical.

[0010] Preferably, the probe of the detector body includes a collector housing and an emitter, the collector housing is disposed outside the emitter, and an insulator is disposed between the collector housing and the emitter.

[0011] Preferably, a coaxial cable is provided at the rear end of the collector housing, a signal core is provided inside the coaxial cable, the signal core is connected to the transmitter, and the collector housing is connected to the ground end of the coaxial cable.

[0012] Preferably, the coaxial cable has a transition body at its rear end, and the rear end of the transition body is connected to the transmission cable.

[0013] Preferably, the transmission cable comprises a cable shell, a cable core, and insulating powder. The cable core is disposed inside the cable shell, and insulating powder is filled between the cable shell and the cable core. The cable core is connected to the signal core, and the detector body is connected to the back-end electronic system through the transmission cable.

[0014] The beneficial effects of this utility model are as follows: The tray and the outer shell of the collector are both made of Incone L600 material, which has a small neutron reaction cross section and is a miniaturized design. It does not require an external power supply, is safe and reliable, and the outer shell of the collector is cylindrical, which facilitates the uniform distribution of external pressure to various positions, improves the pressure resistance of the detector, and is conducive to realizing online detection of the neutron flux distribution in the reactor core under high temperature, high pressure and strong irradiation conditions. In addition, multiple detectors are fixed on the tray in a multi-row matrix to form a whole, which facilitates more accurate online measurement of the neutron flux distribution inside the fuel element. There is no need to put the detectors in one by one, the operation is simple and the cycle is short, and the position of the detector is fixed and the detection position is accurate, thereby improving the position resolution accuracy of the detection. Attached Figure Description

[0015] Figure 1 This is a three-dimensional view of the overall structure of this utility model;

[0016] Figure 2 This is a perspective view of the tray, detector fixing groove, and cable groove of this utility model;

[0017] Figure 3 This is a partial cross-sectional perspective view of the detector body of this utility model.

[0018] In the diagram: 1. Tray; 2. Detector body; 21. Collector housing; 22. Insulator; 23. Emitter; 24. Signal wire core; 25. Coaxial cable; 26. Transition body; 3. Transmission cable; 31. Cable housing; 32. Cable core; 4. Detector fixing groove; 5. Cable groove. Detailed Implementation

[0019] The application will be described in further detail below with reference to the drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the application and cannot be understood as limiting the scope of protection of the application. Those skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0020] Embodiment

[0021] Please refer to Figure 1 and Figure 2 A device for neutron flux distribution detection, comprising a supporting plate 1 and a plurality of detector bodies 2, the supporting plate 1 is fixedly connected with a plurality of detector bodies 2, and the supporting plate 1 and the plurality of detector bodies 2 constitute the device for neutron flux distribution detection, a plurality of detector fixing grooves 4 arranged in multiple rows and matrixes are uniformly arranged on the supporting plate 1, a cable groove 5 is arranged at one end of each detector fixing groove 4, and a detector body 2 is brazed and welded in each detector fixing groove 4, and a transmission cable 3 is arranged at the rear end of the detector body 2, and the transmission cable 3 is fixedly brazed and welded in the cable groove 5.

[0022] In use, first, the structure is designed to determine the position and number of matrix arrangement, and then the size of the supporting plate 1 is determined, the planned position on the supporting plate 1 is slotted, the cable groove 5 is first opened, the orientations of all cable grooves 5 are consistent, the detector fixing groove 4 is then opened, the detector body 2 is then brazed and welded on the detector fixing groove 4, and the transmission cable 3 is also welded in the cable groove 5, the orientations of all transmission cables 3 are kept consistent, and the transmission cable 3 outside the supporting plate 1 is labeled to determine which point of the detector body 2 is connected.

[0023] Please refer to Figure 1 and Figure 3The probe body 2 is composed of a probe head, a transmission cable 3 and a rear-end electronic system, the probe head of the probe body 2 is in a cylindrical shape, the probe head of the probe body 2 comprises a collector shell 21 and an emitter 23, the collector shell 21 is arranged outside the emitter 23, an insulator 22 is arranged between the collector shell 21 and the emitter 23, a coaxial cable 25 is arranged at the rear end of the collector shell 21, a signal wire core 24 is arranged inside the coaxial cable 25, the signal wire core 24 is connected with the emitter 23, the collector shell 21 is connected with the ground end of the coaxial cable 25, a transition body 26 is arranged at the rear end of the coaxial cable 25, and the transition body 26 is connected with the transmission cable 3, the transmission cable 3 comprises a cable shell 31, a cable core wire 32 and insulating powder, the cable core wire 32 is arranged inside the cable shell 31, the cable shell 31 and the cable core wire 32 are filled with the insulating powder, and the cable core wire 32 is connected with the signal wire core 24, and the probe body 2 is connected with the rear-end electronic system through the transmission cable 3.

[0024] After the installation is completed, the whole composed of the supporting plate 1 and the plurality of probe bodies 2 is put into the reactor, the probe body 2 is started, the emitter 23 is made of rhodium, under the neutron irradiation, the emitter 23 absorbs the neutrons and is activated to emit beta rays, after the beta rays are emitted from the emitter 23, the beta rays are transmitted to the collector shell 21 through the insulator 22, since the emitter 23 emits the beta rays and leaves positive charges, the positive charges are neutralized by the electron flow flowing through the resistance and the core wire of the measuring loop from the ground end of the coaxial cable 25, the current value is read, and the beta radioactivity and the corresponding neutron flux can be calculated, the probe body 2 is in a cylindrical shape, so that the external pressure can be evenly dispersed, and the pressure resistance of the probe body 2 is improved.

[0025] It should be noted that, when the device for detecting neutron flux distribution is used, a plurality of probe fixing grooves 4 and cable grooves 5 arranged in a multi-row matrix are uniformly formed on the supporting plate 1, the plurality of probe bodies 2 are welded and installed into the probe fixing grooves 4, the transmission cable 3 is fixed into the cable grooves 5, and then the whole composed of the supporting plate 1 and the plurality of probe bodies 2 is put into the reactor to detect the neutron flux distribution at multiple points, so that the neutron flux distribution inside the fuel element can be more accurately measured online, the probe does not need to be put in one by one, the operation is simple, the period is short, the position of the probe is fixed, the detection position is accurate, and therefore the position resolution accuracy of the flux distribution detection is improved.

[0026] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, a plurality of modifications and improvements can be made, and these all belong to the protection scope of the present application.

Claims

1. A device for neutron flux distribution probing, comprising a carrier plate (1) for assisted fixation and a plurality of detector bodies (2), characterized in that: The plate (1) is fixedly connected with a plurality of detector bodies (2), and the plate (1) and the plurality of detector bodies (2) constitute a neutron flux distribution detection device. The plate (1) is uniformly provided with a plurality of detector fixing grooves (4) arranged in multiple rows in a matrix, each detector fixing groove (4) is provided with a cable groove (5) at one end, and each detector fixing groove (4) is internally soldered with a detector body (2), and the rear end of the detector body (2) is provided with a transmission cable (3), and the transmission cable (3) is fixedly soldered in the cable groove (5).

2. The device for detecting neutron flux distribution according to claim 1, characterized in that: The detector body (2) is composed of a probe, a transmission cable (3) and a rear-end electronic system, and the probe in the detector body (2) is cylindrical.

3. The device for detecting neutron flux distribution according to claim 1, characterized in that: The probe of the detector body (2) includes a collector shell (21) and an emitter (23), the collector shell (21) is arranged outside the emitter (23), and an insulator (22) is arranged between the collector shell (21) and the emitter (23).

4. The device for detecting neutron flux distribution according to claim 3, characterized in that: The rear end of the collector shell (21) is provided with a coaxial cable (25), the coaxial cable (25) is internally provided with a signal wire core (24), the signal wire core (24) is connected with the emitter (23), and the collector shell (21) is connected with the ground end of the coaxial cable (25).

5. A device for neutron flux distribution probing according to claim 4, characterized in that: The rear end of the coaxial cable (25) is provided with a transition body (26), and the rear end of the transition body (26) is connected with the transmission cable (3).

6. The device for detecting neutron flux distribution according to claim 3, characterized in that: The transmission cable (3) is composed of a cable shell (31), a cable core wire (32) and an insulating powder, the cable shell (31) is internally provided with the cable core wire (32), the cable shell (31) and the cable core wire (32) are filled with the insulating powder, the cable core wire (32) is connected with the signal wire core (24), and the detector body (2) is connected with the rear-end electronic system through the transmission cable (3).

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