Multi-detector integrated miniaturized out-of-core nuclear measurement system detection device

Abstract

The invention belongs to the technical field of nuclear radiation detection, and provides a multi-detector integrated miniaturized out-of-pile nuclear measurement system detection device, which comprises a detector array, fixed seats at two ends, a support rod, a ceramic insulation part, a bottom shell, a top end cover, a cable welding sleeve, a barrel and an armored cable assembly, the detection device comprises an array composed of a plurality of single detectors, output signal lines of the detectors are gathered into a line at the end of the detection device to lead out signals, and the outer side of the detection device is sealed through a metal cylinder of the detection device. The detection device disclosed by the invention has the characteristics of high sensitivity and miniaturization, and is suitable for an ex-core nuclear measurement system of a nuclear power station or a marine small reactor.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation detection, and in particular relates to a multi-detector integrated miniaturized out-of-core nuclear measurement system detection device. Background Art

[0002] The ex-core nuclear measurement system monitors the neutron injection rate from the reactor core and provides the neutron injection rate signal to the reactor protection system, so as to achieve real-time monitoring of the reactor power and provide reactor protection and power operation data. It is an important system related to nuclear safety. As a neutron detection element, the performance of the nuclear measurement detection device is crucial to the measurement performance of the entire ex-core nuclear measurement system. At present, domestic nuclear reactors include pressurized water reactors, heavy water reactors, gas-cooled reactors, liquid metal-cooled reactors and other types. Different nuclear power plants and marine nuclear reactors have different requirements for the size, weight and sensitivity of the ex-core nuclear measurement system detection device according to the structure of the reactor type and the installation channel. Some applications require the detection device to have high sensitivity while meeting the requirements of miniaturization to meet the measurement range requirements. In this case, it is sometimes difficult to meet the sensitivity requirements with a single detector, and optimization is required from the design aspect. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies in the above-mentioned prior art and to provide a miniaturized ex-core nuclear measurement system detection device with multi-detector integration. Multiple small detectors are integrated in a supporting cylinder to perform real-time monitoring of the neutron injection rate in the installation channel, while meeting the requirements of sensitivity and miniaturization of the detection device.

[0004] The purpose of the present invention is achieved through the following technical measures.

[0005] A multi-detector integrated miniaturized ex-core nuclear measurement system detection device includes a detector array (the number is determined according to demand), fixed seats at both ends, support rods, ceramic insulating components, a bottom shell, a top end cover, a cable welding sleeve, a cylinder, and an armored cable assembly. The detection device includes an array composed of multiple single detectors, and the output signal lines of each detector converge into a line at the end of the detection device to lead out the signal, and the outside is sealed by the metal cylinder of the detection device. The detection device has the characteristics of high sensitivity and miniaturization, and is suitable for the ex-core nuclear measurement system of nuclear power plants or small marine reactors.

[0006] Furthermore, the shell and end cover of the detection device and the internal detector are all made of titanium alloy to reduce the weight of the detection device.

[0007] Furthermore, the detector array is arranged in the form of a regular polygon.

[0008] Furthermore, two ends of each detector are respectively fixed on the top and bottom fixing seats of the detection device.

[0009] Furthermore, each detector is in an independent sealed state, and the detector array is fixed and sealed in the cylinder of the detection device through a ceramic insulating component embedded in the fixing seat, forming a second seal.

[0010] Furthermore, the output signal lines of each detector are insulated by a ceramic tube and connected in parallel to form a signal line for lead-out. The parallel-connected signal lines are also insulated and sealed by a ceramic tube to avoid interference.

[0011] Furthermore, the armored cable assembly and the cable welding sleeve are connected and fixed by flange form, which is convenient for assembly or disassembly. The armored cable adopts a three-coaxial structure, the first layer of shielding is connected to the shell of each detector as a signal ground, and the second layer of shielding is connected to the outer cylinder of the detection device as a shielding ground.

[0012] Furthermore, the entire detection device is installed in the carrier, and the end surface of the carrier is sealed by a flange for the third sealing.

[0013] Compared with the single detector form, the detection device of the miniaturized ex-core nuclear measurement system with integrated multiple detectors of the present invention adopts the form of a detector array inside the detection device, which increases the neutron reaction sensitive area under the same external dimensions, effectively improves the sensitivity of the detection device, and meets the miniaturization requirements. At the same time, the detector array adopts a multi-layer sealing structure to be insulated and sealed inside the detection device and the carrier, effectively avoiding the impact of the on-site environment and electromagnetic interference, and adapting to the complex on-site environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the detector array integration in the present invention, showing three detectors.

[0015] Figure 2 Schematic diagram of detector array integration in the present invention. There are seven detectors in the figure, and the rest are similar.

[0016] Figure 3 The figure is a schematic diagram of the overall structure of the detection device of the invention.

[0017] Among them: 1. bottom shell, 2. bottom fixing seat, 3. single detector, 4. cylinder, 5. top fixing seat, 6. support rod, 7. top end cover, 8. cable welding sleeve, 9. inflation nozzle. DETAILED DESCRIPTION

[0018] In order to further illustrate the multi-detector integrated miniaturized ex-core nuclear measurement system detection device provided by the present application, the following is combined with Figure 1-3 Provide detailed explanation.

[0019] Determine the number of detectors required based on actual needs and simulation results. After each detector is produced, assembled, and inflated, first weld the cable welding sleeve 8 and the inflation nozzle 9 on the top end cover 7, and then install each detector according to the Figure 1 or 2 are arranged in an array, and the two ends are fixed to the bottom fixing seat 2 and the top fixing seat 5 respectively by fasteners and ceramic insulating components. The bottom fixing seat 2 is fixed to the bottom shell 1 by fasteners, and the top fixing seat 5 is connected to the support rod 6 by fasteners. The cylinder 4 is placed on the bottom shell 1, and then the top end cover 7 is aligned with the support rod 6 for connection. After the installation is completed, the connection between the bottom shell and the top end cover and the cylinder is welded. After the welding is completed, the working gas is filled through the inflation nozzle. After the inflation nozzle is welded and sealed, the detection device is leak-checked. If there is no problem, the miniaturized ex-core measurement system detection device can be put into use.

[0020] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0021] The above descriptions are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-detector integrated miniaturized ex-core nuclear measurement system detection device, characterized in that: It includes a detector array, a fixing base, a support rod, a ceramic insulating component, a bottom shell, a top end cover, a cable welding sleeve, a cylinder and an armored cable assembly. The detector array is an array composed of multiple single detectors. The output signal lines of each detector are converged into one line at the end of the detection device to lead out the signal. The outside of the detector array is sealed by the metal cylinder of the detection device.

2. The multi-detector integrated miniaturized ex-core nuclear measurement system detection device according to claim 1, characterized in that: The output signal lines of each detector are insulated by a ceramic tube and connected in parallel to form a signal line for lead-out. The parallel-connected signal lines are also insulated and sealed by a ceramic tube.

3. The multi-detector integrated miniaturized ex-core nuclear measurement system detection device according to claim 1, characterized in that: The detector array is arranged in the form of a regular polygon.

4. The multi-detector integrated miniaturized ex-core nuclear measurement system detection device according to claim 1, characterized in that: The detection device adopts a three-layer sealing structure, each detector is in an independent sealed state, the detector array is fixed and sealed in the detection device cylinder through a ceramic insulating component embedded in the fixing seat, forming a second seal, and the detection device is installed in the carrier for a third seal.

5. The multi-detector integrated miniaturized ex-core nuclear measurement system detection device according to claim 1, characterized in that: The armored cable adopts a three-coaxial structure. The first layer of shielding is connected to the outer shell of each detector as a signal ground, and the second layer of shielding is connected to the cylinder of the detection device as a shielding ground.

6. The multi-detector integrated miniaturized out-of-core nuclear measurement system detection device according to claim 1, characterized in that: The top end cover is welded with a welding cable welding sleeve and an inflation nozzle, and the detectors are arranged in an array. The two ends are respectively fixed to the bottom fixing seat and the top fixing seat by fasteners and ceramic insulating components. The bottom fixing seat is fixed to the bottom shell by fasteners, and the top fixing seat is connected to the support rod by fasteners. The cylinder is sleeved on the bottom shell, the top end cover is aligned with the support rod and connected, and the connection between the bottom shell and the top end cover and the cylinder is welded.

7. The multi-detector integrated miniaturized ex-core nuclear measurement system detection device according to claim 1, characterized in that: The armored cable assembly and the cable welding sleeve are connected and fixed in the form of a flange, which is convenient for assembly or disassembly.

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