A nuclear power plant site radiation monitoring signal collection device and a monitoring method thereof

Abstract

The present application belongs to the technical field of nuclear power plant area radiation monitoring system, and specifically discloses a nuclear power plant area radiation monitoring signal collection device and a monitoring method thereof. The device comprises a radiation monitoring signal sampling unit, a signal processing and forwarding unit, a signal receiving unit, a signal conversion unit, a signal transmission unit and a signal display unit. The radiation monitoring signal sampling unit is connected with one end of the signal processing and forwarding unit, and the other end of the signal processing and forwarding unit is connected to the signal receiving unit. The signal receiving unit is further connected with the signal conversion unit, the signal transmission unit and the signal display unit in sequence. The present application can solve the technical problem that the existing collection system cannot continuously and closely monitor the radiation monitoring signal and is subject to external virus or network attack.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of nuclear power plant site radiation monitoring system, and particularly relates to a nuclear power plant site radiation monitoring signal collection device and a monitoring method thereof. BACKGROUND

[0002] According to the national regulations, a nuclear power plant must establish a site radiation monitoring system, the purpose of which is to continuously monitor the environmental radiation level of the site during normal operation and accidents. Radiation monitoring collection points are distributed throughout the entire nuclear power plant site.

[0003] The radiation monitoring data of the nuclear power plant needs to be collected for 24 hours without interruption and transmitted to the second layer display system of the DCS for the monitoring of the on-duty personnel in the main control room. When the site environmental radiation monitoring signal is higher than the specified threshold, an alarm is triggered in the DCS to alert the on-duty personnel. The site of the nuclear power plant is divided into a management area, a control area, a protection area and a critical area. The radiation monitoring signal collection points are distributed in the four areas. The DCS system is arranged in the protection area. Therefore, the radiation monitoring signal needs to be transmitted from the management area and the control area of the nuclear power plant to the protection area of the unit. Therefore, the network security problem in the signal transmission process must be considered and prevented.

[0004] According to the information security regulations of the nuclear power plant, when the signals of the management area and the control area are transmitted to the protection area and the inside thereof through the network, the information security must be considered, for example, effective isolation is performed. The signals of the management area and the control area are directly sent to the inside of the protection area through the network. There is still a great security risk.

[0005] At present, there are two ways for the site environmental radiation monitoring signal collection of the nuclear power plant. One is to use a set of office network independent of the DCS to collect the site radiation monitoring signals and send them to the office network of the on-duty personnel in the main control room for display. This set of network and the DCS system are completely different and have no intersection. The advantage of this collection device is that the radiation monitoring collection system and the DCS system are isolated from each other. When the radiation monitoring system has a security problem or a hidden danger, the operation of the DCS system will not be affected, and no major security problem will be caused to the nuclear power plant. The disadvantage is that the on-duty personnel in the main control room are always monitoring and operating the DCS second layer display device under normal circumstances. Therefore, the information sent to the on-duty personnel through the office network has uncertainty in real-time monitoring. The on-duty personnel cannot continuously and closely monitor the radiation monitoring signals on the office network. When the plant has an abnormal radiation signal, it is not easy for the on-duty personnel to find it. In addition, the security and confidentiality of the office network are relatively low.

[0006] The second acquisition mode is to directly acquire the environmental radiation monitoring signal of the plant area by using a network transmission path such as an optical fiber, to communicate the acquired signal to the DCS system of the protection area through a processor after the signal is collected, and to finally display the signal on the DCS second layer. In the signal acquisition loop, an isolation device needs to be installed, so that the protection area is not fundamentally isolated from the management area and the control area, and the network connection between the management area and the protection area may attack the DCS system in the protection area, which may cause the DCS system to be paralyzed or lose original functions, or may cause the DCS system to malfunction, which will affect the safe and stable operation of the nuclear power plant unit.

[0007] Therefore, in order to meet the above-mentioned requirements of radiation monitoring signal acquisition and monitoring, a safe, stable and reliable radiation monitoring signal acquisition device needs to be designed to meet the requirements of information security and improve the shortcomings of the above-mentioned prior art. SUMMARY

[0008] The purpose of the present application is to design a nuclear power plant area radiation monitoring signal acquisition device and its monitoring method, which can solve the technical problem that the existing acquisition system cannot continuously and closely monitor the radiation monitoring signal.

[0009] The technical scheme of the present application is as follows:

[0010] A nuclear power plant area radiation monitoring signal acquisition device, comprising: a radiation monitoring signal sampling unit, a signal processing and forwarding unit, a signal receiving unit, a signal conversion unit, a signal transmission unit and a signal display unit; the radiation monitoring signal sampling unit is connected to one end of the signal processing and forwarding unit, the other end of the signal processing and forwarding unit is connected to the signal receiving unit, and the signal receiving unit is further connected with the signal conversion unit, the signal transmission unit and the signal display unit in sequence.

[0011] The signal sampling unit is arranged in the radiation monitoring signal sampling unit, which is used to acquire the radiation monitoring signal of the nuclear power plant area.

[0012] The signal processing and forwarding unit is arranged in the management area of the nuclear power plant.

[0013] The signal receiving unit and the signal conversion unit are arranged in the protection area of the nuclear power plant.

[0014] An acquisition method of a nuclear power plant area radiation monitoring signal acquisition device, comprising the following steps:

[0015] Step one: signal sampling, the radiation signal of the nuclear power plant area is acquired by the radiation monitoring signal sampling unit;

[0016] Step two: signal processing and forwarding, the radiation monitoring signal sampling unit sends the acquired signal to the signal processing and forwarding unit;

[0017] Step three: signal receiving, signal processing and forwarding unit will receive the radiation monitoring signal processing and forwarding to the signal receiving unit;

[0018] Step four: signal isolation conversion;

[0019] Step five: signal transmission;

[0020] Step six: signal display.

[0021] The step two, signal processing and forwarding, further comprises: the signal processing and forwarding unit processes the radiation monitoring signal and transmits the processed signal; the signal processing unit receives the signal transmitted by the radiation monitoring signal sampling unit, converts it into a data type recognizable by the signal receiving unit according to a specific encoding rule, and periodically packages and transmits the signal according to the working characteristics; after the packaging is completed, the signal is transmitted to the signal receiving unit through a specific communication protocol; the signal processing and forwarding unit receives the network signal from the radiation monitoring signal sampling unit, and the signal processing and forwarding unit analyzes and packages the received data.

[0022] The step three further comprises: the signal processing and forwarding unit processes the received radiation monitoring signal, and then sends the processed signal to the signal receiving unit in the protected area through optical fiber communication; the signal receiving unit receives the network signal sent by the signal processing and forwarding unit; the signal receiving unit receives and reads the data, converts it into a data type recognizable by the signal switching unit according to different transmission protocols and encoding rules, and then the signal switching unit converts the communication signal into an electrical signal.

[0023] The step four: signal isolation conversion, further comprises: the signal switching unit isolates and converts the received network signal, and after the isolation conversion, the radiation monitoring signal becomes a hardwired output signal, realizing the conversion of network signal to hardwired signal; the signal receiving unit receives the radiation monitoring signal data after analysis and processing, and transmits it to the signal switching unit; the signal switching unit converts the analyzed radiation monitoring signal through isolation and digital-to-analog converter processing, and converts the radiation monitoring signal into a hardwired signal that can be output.

[0024] The step five, signal transmission, further comprises: the signal isolation conversion unit sends the converted hardwired signal to the signal transmission unit, and the signal transmission unit functions to transmit the signal to the main control room.

[0025] The step six further comprises: the signal transmission unit transmits the received signal to the main control room, and the signal display unit displays the signal; the signal display unit provides the radiation monitoring signal to the on-duty personnel in the main control room for online monitoring, so as to master the radiation level of the nuclear power plant in real time.

[0026] The beneficial effects of the present application are:

[0027] The device has the characteristics of safety, stability and reliability in the process of signal acquisition and transmission, and needs to ensure that the radiation monitoring signal can be monitored by the on-duty personnel in the main control room in real time during transmission to the DCS system.

[0028] The device ensures the information security of the DCS system of the nuclear power plant. The DCS system of the nuclear power plant is within the protection area. According to the characteristics of the nuclear power plant, the DCS system needs to prevent abnormality. When the device acquires the radiation monitoring signal in the management area and the control area, a signal conversion unit is set. The unit can convert the external network communication signal into a hardwired signal. The hardwired signal is then connected to the DCS system in the protection area. Therefore, the external network signal and the DCS system in the protection area are reliably isolated after the signal conversion unit.

[0029] The on-duty personnel in the main control room can monitor the radiation monitoring signal in real time on the same platform. The traditional radiation monitoring signal is sent to the main control room through the office network. A set of office network equipment is separately set up in the main control room for the on-duty personnel to monitor. The dispersion of the radiation monitoring signal in different places is not conducive to the on-duty personnel's monitoring. It will distract the attention of the personnel. When the radiation level is abnormal, the on-duty personnel cannot be timely reminded. The device can make the radiation monitoring signal of the power plant from the management area and the control area of the nuclear power plant transmitted to the protection area through the network signal. After that, the network signal is isolated and converted into a hardwired current signal in the protection area. The converted hardwired signal is connected to the DCS system in the protection area. The on-duty personnel in the main control room can concentrate and monitor the radiation monitoring signal on the DCS system. When the radiation monitoring signal is abnormal, the on-duty personnel can be timely alarmed and reminded, solving the problems existing in the traditional signal acquisition and display.

[0030] The device also realizes the complete isolation of the external network signal and the DCS system. After the external network signal is communicated to the protection area, it is converted and then sent to the DCS system, which also ensures that the on-duty personnel in the main control room can monitor the radiation level of the nuclear power plant in real time through the DCS system. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The module connection structure diagram of the nuclear power plant area radiation monitoring signal acquisition device designed by the present application is shown. DETAILED DESCRIPTION

[0032] The present application will be further described below in combination with the drawings and examples:

[0033] The application discloses a signal collection device for radiation monitoring in a nuclear power plant area, which comprises a radiation monitoring signal sampling unit 1, a signal processing and forwarding unit 2, a signal receiving unit 3, a signal conversion unit 4, a signal transmission unit 5 and a signal display unit 6.

[0034] The signal sampling unit is arranged in the radiation monitoring signal sampling unit 1 and used for collecting the radiation monitoring signals in the nuclear power plant area.

[0035] The signal processing and forwarding unit 2 is arranged in the management area of the nuclear power plant.

[0036] The signal receiving unit 3 and the signal conversion unit 4 are arranged in the protection area of the nuclear power plant.

[0037] A signal collection method of the signal collection device for radiation monitoring in a nuclear power plant area, which comprises the following steps.

[0038] Step one: signal sampling, the radiation monitoring signal sampling unit is used for collecting the radiation signals in the nuclear power plant area;

[0039] Step two: signal processing and forwarding, the radiation monitoring signal sampling unit sends the collected signals to the signal processing and forwarding unit;

[0040] The signal processing and forwarding unit 2 receives the signals transmitted by the radiation monitoring signal sampling unit 1, converts the signals into a data type recognizable by the signal receiving unit 3 according to a specific coding rule, periodically packs and transmits the signals according to the working characteristics, and transmits the packed signals to the signal receiving unit 3 through the forwarding unit according to a specific communication protocol.

[0041] The signal processing and forwarding unit 2 receives the network signals from the radiation monitoring signal sampling unit, and analyzes and packs the received data for transmission.

[0042] Step three: signal receiving, the signal processing and forwarding unit forwards the processed radiation monitoring signals to the signal receiving unit;

[0043] The third step further comprises that the signal processing and forwarding unit centrally processes the received radiation monitoring signals, and then sends the processed signals to the signal receiving unit arranged in the protection area through optical fiber communication; the signal receiving unit receives the network signals sent by the signal processing and forwarding unit; the signal processing unit 2 receives the signals transmitted by the radiation monitoring signal sampling unit 1; the signal processing unit periodically centrally packages the signals according to the working characteristics, and then transmits the packaged signals to the signal receiving unit through a specific communication protocol via the forwarding unit.

[0044] The signal receiving unit 3 receives and reads the data, converts the data into a data type that can be recognized by the signal switching unit 4 according to different transmission protocols and encoding rules, and then the signal switching unit 4 converts the communication signals into electrical signals.

[0045] The fourth step of signal isolation conversion further comprises that the signal switching unit isolates and converts the received network signals, and after the isolation conversion, the radiation monitoring signals become hard-wired output signals, realizing the conversion of network signals to hard-wired signals. The signal receiving unit 3 receives the radiation monitoring signal data after the analysis and processing, and transmits the data to the signal switching unit 4; the signal switching unit converts the analyzed radiation monitoring signals through isolation and digital-to-analog converter processing, and converts the radiation monitoring signals into output hard-wired signals.

[0046] The fifth step is signal transmission; the signal isolation conversion unit sends the converted hard-wired signals to the signal transmission unit, and the signal transmission unit plays a role in transmitting signals to the main control room.

[0047] The sixth step is signal display.

[0048] The sixth step further comprises that the signal transmission unit transmits the received signals to the main control room, and the signals are displayed in the signal display unit; the signal display unit provides the radiation monitoring signals to the on-duty personnel in the main control room for online monitoring, so as to realize real-time monitoring of the radiation level in the nuclear power plant area.

[0049] The above describes the present application in detail in combination with the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application. The contents not described in detail in the present application can adopt the existing technology.

Claims

1. A nuclear power plant site radiation monitoring signal acquisition device, characterized by, The device comprises a radiation monitoring signal sampling unit (1), a signal processing and forwarding unit (2), a signal receiving unit (3), a signal conversion unit (4), a signal transmission unit (5) and a signal display unit (6); the radiation monitoring signal sampling unit (1) is connected with one end of the signal processing and forwarding unit (2), the other end of the signal processing and forwarding unit (2) is connected to the signal receiving unit (3), the signal receiving unit (3) is further connected with the signal conversion unit (4), the signal transmission unit (5) and the signal display unit (6) in sequence; The radiation monitoring signal sampling unit (1) collects the radiation signals of the nuclear power plant site; The radiation monitoring signal sampling unit (1) sends the collected radiation signals to the signal processing and forwarding unit (2); the radiation signals received by the signal processing and forwarding unit (2) are network signals; the signal processing and forwarding unit (2) receives the radiation signals transmitted by the radiation monitoring signal sampling unit (1), converts them into signal types recognizable by the signal receiving unit (3) according to specific coding rules, and periodically packs and transmits the signals according to the working characteristics, and after the packing is completed, the signals are transmitted to the signal receiving unit (3) through the specific communication protocol of the signal processing and forwarding unit; The signal receiving unit (3) receives the network signals sent by the signal processing and forwarding unit (2); the signal receiving unit (3) receives and reads the signals, converts them into signal types recognizable by the signal conversion unit (4) according to different transmission protocols and coding rules, and transmits them to the signal conversion unit (4); The signal conversion unit (4) isolates and converts the received network signals, which become hardwired signals after the isolation and conversion, realizing the conversion of network signals into hardwired signals; The signal conversion unit (4) sends the converted hardwired signals to the signal transmission unit (5), and the signal transmission unit (5) transmits the received signals to the DCS system main control room for display in the signal display unit (6); The nuclear power plant site is divided into a management area and a protection area, the DCS system is arranged in the protection area, the signal processing and forwarding unit (2) is arranged in the management area, and the signal receiving unit (3), the signal conversion unit (4), the signal transmission unit (5) and the signal display unit (6) are all arranged in the protection area; Through the signal processing and forwarding unit (2), the signal receiving unit (3), the signal conversion unit (4), the signal transmission unit (5) and the signal display unit (6), the radiation signals of the nuclear power plant site are transmitted from the management area to the protection area through network signals, and then the network signals are isolated and converted into hardwired signals in the protection area, the converted hardwired signals are connected to the DCS system in the protection area, and the signals are displayed in the DCS system.

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