CN203338771U - An Air Radiation Monitoring Device - Google Patents

Abstract

The utility model relates to an air radioactivity monitoring device which is used for monitoring radioactivity activity of air in a safety shell of a nuclear power plant. Monitoring is performed with a continuous detection manner through an ionization chamber, relevant detection data are connected with a data net of the nuclear power plant, and therefore networking of automation of the monitoring process and the data detection is achieved. An alarm system is connected with a valve of the safety shell, and when radioactivity of the air in the safety shell exceeds the standard, the alarm system automatically closes the valve of the safety shell. An on-site processing and displaying unit can process and display the detection data in an on-site mode, therefore, the burden of a central control system is relieved, and design of the whole system is more reasonable.

Description

An Air Radiation Monitoring Device

technical field

The utility model relates to the field of nuclear radiation measurement and intelligent control of nuclear power plants, in particular to an air radioactivity monitoring device.

Background technique

The current air radioactivity monitoring devices of nuclear power plants use on-site sampling and off-line monitoring methods for radioactivity monitoring. This method is relatively backward, because more sampling equipment is required, so the equipment failure rate is high, more maintenance work is required, and the measurement range is small. The measurement accuracy is not high, and the relevant monitoring data cannot be recorded online, which is not conducive to analysis, judgment and storage by computer.

Contents of the invention

The technical problem to be solved by the utility model is to design an air radioactivity monitoring device for monitoring the radioactive activity of the air in the containment of nuclear power plants in view of the deficiencies of the prior art.

The technical solution adopted by the utility model to solve the technical problem is: to construct an air radioactivity monitoring device for monitoring the radioactive activity of the air in the containment of the nuclear power plant, and adopt the ionization chamber continuous monitoring method for monitoring.

Preferably, the air radiation monitoring device includes a containment vessel as a measurement target, an ionization chamber for providing an optimal measurement environment for the detector, an air suction pump for extracting air from the containment vessel, and an ionization chamber for the The power supply box powered by the air pump, the filter used to filter the air, used to monitor the radioactive indicators of the air in the containment in real time, and transmit the generated signal to the detector of the on-site processing display unit, used for real-time receiving and processing And transmit the signal generated by the detector, and display the radioactive detection results on-site processing display unit, the nuclear power plant central data acquisition system for collecting and storing and managing the operating data of each system of the nuclear power plant, and the nuclear power plant for comprehensively controlling the operation of each system of the nuclear power plant The control system is used to receive the data transmitted by the on-site processing display unit and remotely display the radioactive detection results, and at the same time transmit the data to the nuclear power plant control system and the centralized cabinet of the nuclear power plant central data acquisition system. The air pump, power supply box, filter, detector, and on-site processing and display unit are all located in the ionization chamber, the power supply box is connected to the air pump, and the air pump communicates with the detector through a pipeline. The detector communicates with the filter through pipelines, the filter communicates with the containment vessel through pipelines, and the detector is also connected with the local signal processing and display unit through cables.

Preferably, the on-site processing display unit is provided with a power line interface and an RS485 interface, and the on-site processing display unit is connected to the junction box through these two interfaces, and the junction box is also provided with a power line interface and an RS485 interface , the junction box is connected to the centralized cabinet through these two interfaces.

Preferably, the nuclear power plant control system includes an alarm system and a main control room for automatically closing the containment valve when the detector detects that air radioactivity exceeds the standard.

Preferably, the containment vessel includes a containment vessel valve, the alarm system is connected to the containment vessel valve, and when the detector detects that air radioactivity exceeds the standard, the alarm system automatically closes the containment vessel valve.

Preferably, the centralized cabinet is located in a control room separated from the ionization chamber by a predetermined safety distance, and the centralized cabinet is used to centrally install the centralized processing components of the monitoring channel, and can complete monitoring channel alarm prohibition, power distribution, alarm signal Combination, parameter modification, data display and interaction and other functions. The centralized cabinet is also the center of the external interface of the system, and the input and output of all the switching values, analog values, communication ports and power supply of the system are unified by the centralized cabinet. The centralized cabinet is provided with an RS485 output port through which signals are transmitted to the central data acquisition system, the centralized cabinet includes a remote display unit, and the remote display unit is provided with a switch output port and an analog output port , connected to the nuclear power plant control system through the switch output port and the analog output port, the switch signal is transmitted to the alarm system in the nuclear power plant control system through the switch output port, and the analog The output port transmits the analog signal to the main control room in the nuclear power plant control system. The alarm system is connected to the valve of the containment, and when the detector detects that the air radioactivity exceeds the standard, the alarm system automatically closes the valve of the containment to prevent the radioactive substances in the containment from spreading outward.

Preferably, under the action of the air pump, the air in the containment is filtered by the filter and flows into the detector, and the detector monitors the radioactivity of the air in real time and transmits the detection information to The on-site processing and display unit transmits the detection information to the centralized cabinet through the junction box, transmits the detection information to the central data acquisition system through the centralized cabinet, and transmits the detection information to the central data acquisition system through the remote display unit in the centralized cabinet. The information is transmitted to the nuclear power plant control system, and the remote display unit is provided with a switch output port and an analog output port connected to the nuclear power plant control system, and the switch signal is transmitted to the nuclear power plant control system through the switch output port The alarm system in the nuclear power plant triggers all levels of electronic alarm devices distributed throughout the nuclear power plant, and the analog signal is transmitted to the main control room in the nuclear power plant control system through the analog output port. The alarm system can provide real-time feedback to the detector. If the detection information of the detector shows that the radioactivity of the air exceeds the set index, the alarm system can send an instruction to the detector to close the valve of the containment , to prevent the radioactive material in the containment from spreading outward.

The air radioactivity monitoring device of the utility model adopts the continuous monitoring mode of the ionization chamber to monitor, which obviously improves the safety, increases the measurement range, improves the measurement accuracy and efficiency, and the relevant monitoring data is connected with the data network of the nuclear power plant to realize In order to realize the automation of the detection process and the networking of the measurement data, the local processing and display unit can process and display the detection data locally, which reduces the burden on the central control system and makes the design of the entire system more reasonable.

Description of drawings

Fig. 1 is a structural diagram of an air radiation monitoring device in a preferred embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

The utility model is suitable for air radioactivity monitoring in nuclear power plants, and includes the following components: ionization chamber T, air pump A, power supply box B, containment 1, containment valve 11, filter 2, detector 3, on-site processing display unit 4, Power line interface 41, RS485 interface 42, junction box 5, power line interface 51, RS485 interface 52, centralized cabinet 6, remote display unit 61, digital interface 611, analog interface 612, RS485 interface 62, central data acquisition system 7 , nuclear power plant control system 8, alarm system 81, main control room 82.

Among them, the power supply box B supplies power to the air pump A. Under the action of the air pump A, the air in the containment 1 flows to the filter 2 to be filtered through the pipeline, and the filtered air continues to flow to the detector 3, which detects the air in real time. and transmit the detection information to the on-site processing and display unit 4. The on-site processing and display unit 4 is provided with a power line interface 41 and an RS485 interface 42, and is connected to the junction box 5 through these two interfaces, and the junction box 5 is provided with a power cord The interface 51 and the RS485 interface 52 are connected to the centralized cabinet 6 through these two interfaces. The centralized cabinet 6 is located in the control room separated from the waste liquid discharge pipeline by a predetermined safety distance. The centralized cabinet 6 is provided with a remote display unit 61. The centralized cabinet 6 There is also an RS485 output port 62, through which the signal is transmitted to the central data acquisition system 7, and the remote display unit 61 is provided with a switch output port 611 and an analog output port 612, which are connected to the nuclear power plant control system 8 through these two ports , the switch signal is transmitted to the alarm system 81 in the nuclear power plant control system 8 through the switch output port 611, and the analog signal is transmitted to the main control room 82 in the digital control system 8 of the nuclear power plant data network through the analog output port 612 , the alarm system 81 is connected with the containment valve 11. When the detector 3 detects that the air radioactivity exceeds the standard, the alarm system 81 automatically closes the containment valve 11 to prevent the radioactive substances in the containment 1 from spreading outward.

As a preferred embodiment, the filter 2 can be composed of a ventilation filter, which can filter out dust in the air. The detector 3 can be composed of a gas radioactive material detector installed in the ionization chamber T. The detector 3 passes through a section with a length of about 5 meters. The cable connected to the local processing display unit 4, the air pump A, the power supply box B, the filter 2, the detector 3, and the local processing display unit 4 are all installed in the ionization chamber T, and the remote display unit 61 is installed in the centralized cabinet 6 consists of a data processor and a display. The centralized cabinet 6 is located in the control room separated from the ionization chamber T by a predetermined safety distance, and is used to centrally install the centralized processing components of the monitoring channel, and complete the monitoring channel source inspection, alarm prohibition, and power supply distribution. , Combination of alarm signals and other functions. The centralized cabinet 6 is also the center of the external interface of the system, and the input and output of all the switching values, analog values, communication ports and power supply of the system are centralized by the centralized cabinet. The main control room 82 is composed of a panel with strong processing capacity, a display and a controller. The controller is installed on the containment valve 11. The alarm system 81 can be connected with the controller on the containment valve 11 through a cable. When the detector 3 When air radioactivity exceeds the standard, the alarm system 81 sends an instruction to the controller on the containment valve 11 to automatically close the containment valve 11 to prevent the radioactive substances in the containment 1 from spreading outward.

Under the action of the air pump A, the air in the containment vessel 1 is filtered by the filter 2 and then flows into the detector 3. The detector 3 monitors the radioactivity of the air in real time, and transmits the detection information to the on-site processing and display unit 4. The processing display unit 4 transmits the detection information to the centralized cabinet 6 through the junction box 5, the centralized cabinet 6 transmits the detection information to the central data acquisition system 7 of the nuclear power plant, and the remote display unit 61 in the centralized cabinet 6 transmits the detection information to the nuclear power plant control system 8 , the remote display unit 61 is provided with a switching value output port 611 and an analog output port 612 connected to the nuclear power plant control system 8, and the switching value signal is transmitted to the alarm system 81 in the nuclear power plant control system 8 through the switching value output port 611 and triggers the distribution The electronic alarm devices at all levels in the nuclear power plant transmit the analog signal to the main control room 82 through the analog output port. If the detector 3 detects that the air radioactivity exceeds the standard, the alarm system 81 sends an instruction to the controller on the containment valve 11 to automatically close the containment valve 11 to prevent the radioactive substances in the containment 1 from spreading outward.

The air radioactivity monitoring device of the utility model adopts the ionization chamber continuous detection method for detection, and the relevant detection data is connected with the data network of the nuclear power plant, realizing the automation of the monitoring process and the networking of the detection data. The alarm system is connected with the containment valve. When the radioactivity of the air in the containment exceeds the standard, the alarm system will automatically close the containment valve. Local processing The display unit can process and display detection data locally, which reduces the burden on the central control system and makes the design of the entire system more reasonable.

Claims (6)

1. An air radiation monitoring device is used to monitor the radioactive activity of the air in the containment of a nuclear power plant, and it is characterized in that: the air radiation monitoring device includes a containment for use as a measurement target, for providing the best An ionization chamber for measuring the environment, an air extraction pump for extracting air from the containment, a power supply box for supplying power to the air extraction pump, a filter for filtering air, and real-time monitoring of the radioactivity of the air in the containment indicator, and transmit the generated signal to the detector of the on-site processing and display unit, for real-time receiving, processing and transmission of the signal generated by the detector, and the on-site processing and display unit for displaying the radioactivity detection result, for collecting and storing The nuclear power plant central data acquisition system for managing the operating data of each system of the nuclear power plant, the nuclear power plant control system for comprehensively controlling the operation of each system of the nuclear power plant, and the nuclear power plant control system for receiving the data transmitted by the on-site processing display unit and remotely displaying the radioactive detection results, and at the same time transmitting the data Centralized cabinets for the control system of the nuclear power plant and the central data acquisition system of the nuclear power plant; The air pump is connected with the detector through the pipeline, the detector is connected with the filter through the pipeline, the filter is connected with the containment through the pipeline, the detector is connected with the The on-site processing and display unit is connected, the on-site processing and display unit is connected to the junction box, the junction box is connected to the centralized cabinet, the centralized cabinet includes a remote display unit, and the remote display unit is provided with and The digital output port and the analog output port connected to the nuclear power plant control system are used to respectively transmit the digital signal and the analog signal to the nuclear power plant control system through the digital output port and the analog output port. 2. The air radiation monitoring device according to claim 1, characterized in that: the on-site processing and display unit is provided with a power line interface and an RS485 interface, and the on-site processing and display unit passes through the power line interface and the RS485 interface. The interface is connected to the junction box. 3. The air radiation monitoring device according to claim 1, characterized in that: the junction box is provided with a power line interface and an RS485 interface, and the junction box is connected to the centralized cabinet through the power line interface and the RS485 interface . 4. The air radiation monitoring device according to claim 1, characterized in that: the nuclear power plant control system includes an alarm system and a main control room. 5. The air radiation monitoring device according to claim 1, characterized in that: the containment includes a containment valve, and the alarm system is connected with the containment valve for when the detector detects that the air radioactivity exceeds the standard , to automatically close the containment valve. 6. The air radiation monitoring device according to claim 1, characterized in that: the centralized cabinet is located in a control room separated from the waste liquid discharge pipeline by a predetermined safety distance, the centralized cabinet is provided with an RS485 interface, and the centralized cabinet The signal is transmitted to the central data acquisition system through the RS485 interface.

Images