Containment high range area radiation monitoring device

Abstract

The present invention belongs to the technical field of nuclear radiation monitoring and protection, and specifically relates to a post-accident high-range regional radiation monitoring device, the monitoring device comprising a γ-sensitive ionization chamber detection device installed in a containment, and a hard cable adapter box connected to the γ-sensitive ionization chamber detection device through a hard cable, the detection device also comprising a front-end processing unit arranged in a measurement room outside the containment and connected to the hard cable adapter box through a hard cable, and an on-site radiation processing unit arranged on the wall of the measurement room outside the containment, the on-site radiation processing unit communicates with the front-end processing unit through an RS485 interface, the junction box is respectively connected to the ionization chamber detector and the on-site radiation processing unit, and provides power supply, the measurement range of the present invention is 1×10 ‑2 Gy / h~1×10 5 The measurement range is wide, with a measurement width of 8 orders of magnitude and a measurement upper limit of 10 5 Gy / h; and resistant to accident conditions such as radiation, high temperature, high pressure, and high humidity.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation monitoring and protection, and in particular relates to a post-accident high-range regional radiation monitoring device. Background Art

[0002] With the adjustment of my country's energy structure and increasing environmental pressure, the pace of nuclear power construction will accelerate. The construction of each pressurized water reactor nuclear power unit will be accompanied by a rigid demand for high-range regional radiation monitors for the containment. At the same time, the second-generation or second-generation improved nuclear power units in early operation have begun to enter the instrumentation and control system transformation stage, and there is also a large market demand for high-range regional radiation monitors for the containment.

[0003] The containment high-range area radiation monitor is used to continuously measure the gamma radiation dose rate inside the containment of a nuclear power plant. It is mainly used to discover and identify nuclear power plant accidents rather than to protect nuclear power plant workers. The containment high-range area radiation monitor is also used for post-accident monitoring, measuring the changes in the gamma dose rate inside the containment after an accident, providing a basis for accident mitigation or accident handling. Summary of the invention

[0004] In view of this, the main purpose of the present invention is to provide a post-accident high-range regional radiation monitoring device. The technical solution adopted by the present invention is:

[0005] A high-range area radiation monitoring device for a containment shell, the detection device comprises a gamma-sensitive ionization chamber detection device installed in the containment shell, and a hard cable adapter box connected to the gamma-sensitive ionization chamber detection device through a hard cable, the detection device also comprises a front-end processing unit arranged in a measurement room outside the containment shell and connected to the hard cable adapter box through a hard cable, and an on-site radiation processing unit arranged on the wall of the measurement room outside the containment shell, the on-site radiation processing unit communicates with the front-end processing unit through an RS485 interface, and a junction box is respectively connected to the ionization chamber detector and the on-site radiation processing unit, and provides power.

[0006] Furthermore, the gamma-sensitive ionization chamber detection device and the hard cable adapter box are both installed on an ionization chamber fixed base, the gamma-sensitive ionization chamber detection device is isolated from the ionization chamber fixed base by four insulating support columns, the gamma-sensitive ionization chamber detection device includes an ionization chamber, the ionization chamber includes a protective shell and an ionization chamber body placed in the protective shell, an insulator is provided at the front end of the ionization chamber body, a front end insulator and a hard cable fixing seat are sleeved along the outer periphery of the insulator, the hard cable extending into the ionization chamber and the end of the hard cable protective sleeve are fixed on the hard cable fixing seat and connected to the cable connector, a rear end insulator is provided at the rear end of the ionization chamber body, and two sets of disc springs are installed between the rear end insulator and the ionization chamber body; the ionization chamber body includes a coaxially arranged outer high-voltage electrode, a collector and a central high-voltage electrode, and the outer high-voltage electrode, the collector and the central high-voltage electrode are fixed by insulators, the collector extends out of the insulator and is connected to the cable connector, a collector jacket is provided along the outer periphery of the connecting part of the collector and the cable connector, and the front end of the central high-voltage electrode is embedded in the inspection source.

[0007] Furthermore, a high-voltage tail end is welded to the rear end of the outer high-voltage electrode, the tail end of the central high-voltage electrode is threadedly connected to the high-voltage tail end, and tail end insulators are provided on both sides of the tail end of the central high-voltage electrode, one end of the tail end insulator contacts the high-voltage tail end, and a group of springs are provided between the other end and the collecting electrode; a head end insulator is provided at the front end of the central high-voltage electrode, and the inspection source is arranged between the front end of the central high-voltage electrode and the head end insulator.

[0008] Furthermore, two groups of insulating support rings are provided between the protective shell and the ionization chamber body, and four groups of disc springs are provided between the central high-voltage electrode and the insulator.

[0009] Furthermore, an inflation nozzle is provided on the rear end of the protective shell, and the inflation nozzle inflates air into the interior of the ionization chamber through an opening on the rear end of the ionization chamber body. The rear end of the protective shell is connected to the rear cover through threads, and the front end of the protective shell is welded to the front cover.

[0010] Furthermore, the ionization chamber fixed base is made of 316L stainless steel, and its height and wall thickness are 27 mm and 3 mm respectively.

[0011] Furthermore, a polyimide fixing block is installed inside the hard cable adapter box to fix the connector on the fixing block. The connector includes a male connector and a female connector that are arranged in mirror symmetry. The male connector includes a male shell, and a male front end insulator and a male tail end insulator are pressed into the front and rear ends of the male shell respectively, and a tail clamp graphite gasket I is provided between the tail end of the male shell and the tail clamp. The hard cable passes through the tail clamp I, the male tail end insulator and the male front end insulator in sequence and is welded to the male inner core; the female connector includes a female shell, and a female front end insulator and a female tail end insulator are pressed into the front and rear ends of the female shell respectively, and a tail clamp graphite gasket II is provided between the tail end of the female shell and the tail clamp II. The hard cable passes through the tail clamp, the female tail end insulator and the female front end insulator in sequence and is welded to the female inner core, and a graphite gasket is provided at the connection between the male shell and the female shell for sealing.

[0012] Furthermore, the front-end processing unit includes an adjustable gain amplifier, a V / F converter and an ARM control unit. The adjustable gain amplifier is connected to the γ-sensitive ionization chamber detection device through a hard cable, the adjustable gain amplifier is connected to the ARM control unit through the V / F conversion unit, and the ARM control unit is connected to the on-site radiation processing unit through an RS485 interface.

[0013] Furthermore, the local radiation processing unit includes an ARM central processor and a display screen, an input keyboard, an RS485 port, a network port and multiple I / O ports connected to the ARM main processor.

[0014] The display screen displays the measurement data in a set format;

[0015] The keyboard inputs corresponding information;

[0016] The RS485 port transmits or receives data sent by the front-end processing unit;

[0017] The network port enables communication and data exchange with an external computer;

[0018] The I / O port receives the measured temperature, pressure and flow rate signals, and outputs an alarm or switch control signal.

[0019] Beneficial effects of the present invention: The present invention detects gamma ray radiation with a measurement range of 1×10 -2 Gy / h~1×10 5 The measurement range is wide, with a measurement width of 8 orders of magnitude and an upper limit of 10 5 Gy / h; and resistant to accident conditions such as radiation, high temperature, high pressure, and high humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is the principle connection framework principle diagram of the present invention;

[0021] Figure 2 This is an installation diagram of the gamma-sensitive ionization chamber detection device and the hard cable adapter box in the present invention;

[0022] Figure 3 It is a structural schematic diagram of the γ-sensitive ionization chamber detection device in the present invention;

[0023] Figure 4 It is a structural schematic diagram of the hard cable transfer box in the present invention;

[0024] Figure 5 It is a schematic diagram of the framework of the front-end processing unit in the present invention;

[0025] Figure 6 This is a schematic diagram of the framework of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0027] Reference Figure 1 The present invention specifically discloses a high-range area radiation monitoring device for a containment, the detection device comprises a γ-sensitive ionization chamber detection device 1 installed in the containment, and a hard cable adapter box 2 connected to the γ-sensitive ionization chamber detection device through a hard cable, the detection device also comprises a front-end processing unit 3 arranged in a measurement room outside the containment and connected to the hard cable adapter box through a hard cable, and an on-site radiation processing unit 4 arranged on the wall of the measurement room outside the containment, the on-site radiation processing unit 4 communicates with the front-end processing unit 3 through an RS485 interface, and a junction box 5 is respectively connected to the ionization chamber detector 1 and the on-site radiation processing unit 4, and provides power.

[0028] The parameter settings of the containment high-range area radiation monitoring device are shown in Table 1-1:

[0029] Table 1-1 Monitoring device parameter settings

[0030]

[0031] like Figure 2 , 3As shown, the gamma-sensitive ionization chamber detection device 1 and the hard cable adapter box 2 are both installed on a 316L stainless steel ionization chamber fixed base 6, which has a height of 27 mm and a wall thickness of 3 mm. The gamma-sensitive ionization chamber detection device is isolated from the ionization chamber fixed base by four insulating support columns 7. The gamma-sensitive ionization chamber detection device 1 includes an ionization chamber. The overall dimensions of the ionization chamber detection device (length×width×height) are: 850 mm×150 mm×130 mm, and the total weight of the device is ≤8.5 kg. It includes a protective shell 101 and an ionization chamber body placed in the protective shell 101. An insulator is provided at the front end of the ionization chamber body, and a front end insulator 112 and a hard cable fixing seat are sleeved along the outer periphery of the insulator. The ends of the hard cable 108 and the hard cable protective sleeve 109 extending into the ionization chamber are fixed on the hard cable fixing seat and connected to the cable connector. The rear end of the ionization chamber body is provided There is a rear insulator 114, and two sets of disc springs 117 are installed between the rear insulator 114 and the ionization chamber body; the ionization chamber body includes an outer high-voltage electrode 102, a collector 103 and a central high-voltage electrode 104 arranged coaxially, and the outer high-voltage electrode 102, the collector 103 and the central high-voltage electrode 104 are fixed by an insulator, the collector 103 extends out of the insulator and is connected to the cable connector, and a collector jacket 107 is provided along the periphery of the connecting part of the collector 103 and the cable connector, and the front end of the central high-voltage electrode 104 is embedded in the inspection source 105; an inflation nozzle 116 is provided on the rear end of the protective shell 1, and the inflation nozzle 116 inflates the interior thereof through the opening on the tail end of the ionization chamber body, the rear end of the protective shell 101 is connected to the rear cover by threads, and the front end of the protective shell 101 is welded to the front cover; ionization chamber size (diameter×length) After adding the stainless steel protective cover, the detector size (diameter × length) The weight is about 2.5kg; after the inflation, wiring and welding processes are completed, the entire ionization chamber is an inseparable sealed entity.

[0032] Two groups of insulating support rings 113 are provided between the protective shell 101 and the ionization chamber body, and interference fit is adopted to prevent radial displacement between the ionization chamber body and the shell when the ionization chamber body is vibrated; four groups of disc springs 117 are provided between the central high-voltage electrode 104 and the insulator, and a group of springs 118 is provided between the collecting electrode 104 and the rear end insulator 114, which are given a certain pre-compression force during welding and packaging, so that the three coaxial electrodes are reliably connected to prevent mutual displacement during vibration; the two groups of disc springs 117 arranged between the ionization chamber body and the rear end insulator 114 are welded to the shell to fix the ionization chamber while giving the ionization chamber a certain pre-compression force, so as to prevent axial displacement between the ionization chamber and the shell when the ionization chamber is vibrated.

[0033] The ionization chamber body is isolated from the protective shell 101 by insulating materials, and the outer high-voltage electrode 102 and the central high-voltage electrode 104 are isolated from the collector 103 by insulating materials respectively; the rear insulator 114, the front insulator 112, the insulator and the insulating material are all made of radiation-resistant polyimide, which has a high temperature resistance of more than 400°C and a long-term use temperature range of -200°C to 300°C; polyimide also has good dielectric properties, a dielectric constant of about 3.4, and a dielectric loss of only 0.004 to 0.007; the strength retention rate of the polyimide film after 5×109rad fast electron irradiation is 90%, and it has high radiation resistance; its thermal expansion coefficient is 2×10-5m / °C to 3×10-5m / °C, and it has good thermal stability.

[0034] At the connection between the hard cable 108 and the front cover 115, a longer stainless steel hard cable protective sheath is designed. The sheath and the rear cover are welded by argon arc welding, and the hard cable 108 and the hard cable protective sheath 109 are welded by copper or silver brazing, which plays a role in protecting the hard cable and the welding weld during an earthquake; the hard cable and the hard cable protective sheath extending into the ionization chamber are fixed on the hard cable fixing seat, and then the cable connector is connected to ensure that when the front cover is welded or vibrated, the force on the hard cable will not be transmitted to the cable connector, so as to prevent the cable connector from being connected or disconnected due to force; the outer end face of the insulator is convex stepped, and the collector 103 extends outward through the insulator and is connected to the cable connector. The outer periphery of the connecting part is provided with a collector sheath, and the outer high-voltage electrode 102 is fixed on the insulator and retracted inward.

[0035] like Figure 4As shown, a polyimide fixing block is installed inside the hard cable adapter box to fix the connector on the fixing block. The fixing block ensures that the connector potential is floating on the one hand, and bears the pulling force from the hard cable on the other hand to prevent the connector connection from failing due to excessive pulling force of the hard cable during the engineering wiring process; the connector includes a male connector and a female connector arranged in a mirror-symmetrical manner, the male connector includes a male shell 201, a male front end insulator 202 and a male tail end insulator 203 are pressed into the front and rear ends of the male shell 201 respectively, a tail clip graphite gasket Ⅰ 205 is provided between the tail end of the male shell 201 and the tail clip Ⅰ 204, and the hard The cable passes through the tail clip I 204, the male tail end insulator 203 and the male front end insulator 202 in sequence and is welded to the male inner core 206; the female connector includes a female shell 207, and a female front end insulator 208 and a female tail end insulator 209 are pressed into the front and rear ends of the female shell 207 respectively, and a tail clip graphite gasket II 211 is provided between the tail end of the female shell 207 and the tail clip II 210. The hard cable passes through the tail clip II 210, the female tail end insulator 209 and the female front end insulator 208 in sequence and is welded to the female inner core 212, and a graphite gasket 213 is provided at the connection between the male shell 201 and the female shell 207 for sealing.

[0036] The hard cable shell and tail clip I 204 and tail clip II 210 are welded by copper / silver brazing, and the welding of the hard cable core to the male inner core 206 and the female inner core 212 is brazing with high-temperature solder; the sealing of tail clip I 204 and tail clip II 210 and the connector housing and the sealing of the male and female connectors are compressed and sealed by lead pads; the lead pads have good ductility and can obtain good sealing.

[0037] like Figure 5 , 6 As shown, the front-end processing unit includes an adjustable gain amplifier, a V / F converter and an ARM control unit. The adjustable gain amplifier is connected to a γ-sensitive ionization chamber detection device through a hard cable, the adjustable gain amplifier is connected to the ARM control unit through a V / F conversion unit, and the ARM control unit is connected to an on-site radiation processing unit through an RS485 interface.

[0038] The output signal of the γ-sensitive ionization chamber detection device is transmitted to the adjustable gain amplifier through a hard cable for appropriate amplification, then enters the V / F conversion module, and then enters the acquisition and processing circuit of the ARM control unit. When the output current of the γ-sensitive ionization chamber detection device is large, the ARM controls the adjustable gain amplifier circuit to reduce the amplification factor.

[0039] The front-end processing unit communicates with the local radiation processing unit via the RS485 interface and transmits the measured data to the local radiation processing unit for processing and display.

[0040] The on-site radiation processing unit includes an ARM central processor and a display screen, an input keyboard, an RS485 port, a network port and multiple I / O ports connected to the ARM main processor. The display screen displays the measurement data in a set format; the keyboard inputs corresponding information; the RS485 port transmits or receives data sent by the front-end processing unit; the network port realizes communication and data exchange with an external computer; the I / O port receives the measured temperature, pressure and flow signals, and outputs alarm or switch control signals.

[0041] The overall performance characteristics of the containment high-range area radiation monitoring device formed by connecting the γ-sensitive ionization chamber detection device, hard cable, front-end processing unit, on-site radiation processing unit and junction box are shown in Table 1-2.

[0042] Table 1-2 Overall performance characteristics of the monitor

[0043]

[0044]

[0045] The technical solutions disclosed in the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the embodiments of the present invention are explained in this article using specific embodiments. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. High-range area radiation monitoring device for containment, characterized in that: Including those installed in the containment Sensitive ionization chamber detection device, and through a hard cable with A hard cable transfer box connected to the sensitive ionization chamber detection device, the monitoring device also includes a front-end processing unit arranged in the measurement room outside the containment and connected to the hard cable transfer box through a hard cable, and an on-site radiation processing unit arranged on the wall of the measurement room outside the containment, the on-site radiation processing unit communicates with the front-end processing unit through an RS485 interface, and the junction box is respectively connected to the ionization chamber detector and the on-site radiation processing unit, and provides power; Said The sensitive ionization chamber detection device and the hard cable adapter box are both installed on the ionization chamber fixed base. The sensitive ionization chamber detection device is isolated from the ionization chamber fixed base by four insulating support columns. The sensitive ionization chamber detection device comprises an ionization chamber, which comprises a protective shell and an ionization chamber body placed in the protective shell, an insulator is arranged at the front end of the ionization chamber body, a front end insulator and a hard cable fixing seat are sleeved along the outer periphery of the insulator, the hard cable and the end of the hard cable protective sleeve extending into the ionization chamber are fixed on the hard cable fixing seat and connected to the cable connector, a rear end insulator is arranged at the rear end of the ionization chamber body, and two groups of disc springs are installed between the rear end insulator and the ionization chamber body; the ionization chamber body comprises a coaxially arranged outer high-voltage electrode, a collector and a central high-voltage electrode, and the outer high-voltage electrode, the collector and the central high-voltage electrode are fixed by an insulator, the collector extends out of the insulator and is connected to the cable connector, a collector jacket is arranged along the outer periphery of the connecting portion of the collector and the cable connector, and the front end of the central high-voltage electrode is embedded in the inspection source; The rear end of the protective shell is provided with an air filling nozzle, which fills air into the interior of the ionization chamber through an opening on the rear end of the ionization chamber body. The rear end of the protective shell is connected to the rear cover through threads, and the front end of the protective shell is welded to the front cover. A stainless steel hard cable protective sleeve is provided at the connection between the hard cable and the front cover. The hard cable protective sleeve and the front cover are welded by argon arc welding, and the hard cable and the hard cable protective sleeve are welded by copper or silver brazing, which plays a role in protecting the hard cable and the welding seam during an earthquake; the hard cable and the hard cable protective sleeve extending into the ionization chamber are fixed on the hard cable fixing seat, and then the cable connector is connected to ensure that when the front cover is welded or vibrated, the force on the hard cable will not be transmitted to the cable connector, so as to prevent the cable connector from being connected or disconnected due to force; the outer end face of the insulator is convex stepped, the collector extends outward through the insulator and is connected to the cable connector, and the outer periphery of the connecting part is provided with a collector sleeve, and the outer high-voltage electrode is fixed on the insulator and retracted inward.

2. The containment high-range area radiation monitoring device according to claim 1, characterized in that: A high-voltage tail end is welded to the rear end of the outer high-voltage electrode, and the tail end of the central high-voltage electrode is threadedly connected to the high-voltage tail end. Tail end insulators are provided on both sides of the tail end of the central high-voltage electrode, one end of the tail end insulator contacts the high-voltage tail end, and a group of springs are provided between the other end and the collecting electrode; a head end insulator is provided at the front end of the central high-voltage electrode, and the inspection source is arranged between the front end of the central high-voltage electrode and the head end insulator.

3. The containment high-range area radiation monitoring device according to claim 1, characterized in that: Two groups of insulating support rings are arranged between the protective shell and the ionization chamber body, and four groups of disc springs are arranged between the central high-voltage electrode and the insulator.

4. The containment high-range area radiation monitoring device according to claim 1, characterized in that: The ionization chamber fixed base is made of 316L stainless steel, and its height and wall thickness are 27 mm and 3 mm respectively.

5. The containment high-range area radiation monitoring device according to claim 1, characterized in that: A polyimide fixing block is installed inside the hard cable transfer box to fix the connector on the fixing block. The connector includes a male connector and a female connector that are arranged in mirror symmetry. The male connector includes a male shell, and a male front end insulator and a male tail end insulator are pressed into the front and rear ends of the male shell respectively. A tail clamp graphite gasket I is provided between the tail end of the male shell and the tail clamp I. The hard cable passes through the tail clamp I, the male tail end insulator and the male front end insulator in sequence and is welded to the male inner core; the female connector includes a female shell, and a female front end insulator and a female tail end insulator are pressed into the front and rear ends of the female shell respectively. A tail clamp graphite gasket II is provided between the tail end of the female shell and the tail clamp II. The hard cable passes through the tail clamp II, the female tail end insulator and the female front end insulator in sequence and is welded to the female inner core. A graphite gasket is provided at the connection between the male shell and the female shell for sealing.

6. The containment high-range area radiation monitoring device according to claim 1, characterized in that: The front-end processing unit includes an adjustable gain amplifier, a V / F converter and an ARM control unit. The adjustable gain amplifier is connected to a g-sensitive ionization chamber detection device through a hard cable. The adjustable gain amplifier is connected to the ARM control unit through a V / F conversion unit. The ARM control unit is connected to an on-site radiation processing unit through an RS485 interface.

7. The containment high-range area radiation monitoring device according to claim 1, characterized in that: The local radiation processing unit includes an ARM central processor and a display screen, an input keyboard, an RS485 port, a network port and multiple I / O ports connected to the ARM central processor. The display screen displays the measurement data in a set format; The input keyboard inputs corresponding information; The RS485 port transmits or receives data sent by the front-end processing unit; The network port enables communication and data exchange with an external computer; The I / O port receives the measured temperature, pressure and flow rate signals, and outputs an alarm or switch control signal.

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