An aerosol, iodine and inert gas sampling device for accidents and post-accident situations

Abstract

The present invention belongs to the technical field of nuclear radiation protection, and provides an aerosol, iodine, and inert gas sampling device for accidents and after accidents, including an integrated aerosol and iodine sampling device, an inert gas adsorption bottle, and a vacuum pump. Aerosol and iodine sampling is completed through the aerosol and iodine sampling device, and inert gas sampling is completed through the inert gas adsorption bottle, and the radioactive gas distribution flow is comprehensively collected and sampled for monitoring. The device of the present invention adopts three working modes, namely, normal accident working mode, severe accident working mode, and purification and flushing mode. The three modes are switched in an orderly manner according to the working conditions to ensure that the functions of the aerosol, iodine, and inert gas sampling devices after accidents respond in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation protection, and in particular relates to an aerosol, iodine and inert gas sampling device used for accidents and post-accident situations. Background Art

[0002] When the core fuel elements of a nuclear power plant reactor are operating normally or damaged, a small amount of radioactive fission products will penetrate into the primary coolant from the cracks of the fuel elements. When a leak occurs in the primary loop, these radioactive fission products will enter the air in the sealed reactor containment through relevant pathways to form radioactive gaseous distribution (radioactive aerosols, iodine and inert gases). When the reactor containment is shut down, professionals are required to enter the containment to perform necessary maintenance and inspection work. In order to protect the safety of relevant personnel, maintain the safe operation of the nuclear power plant, and ensure the normal operation of the nuclear power plant, it is urgent to develop an accident and post-accident radioactive aerosol, iodine, and inert gas sampling device to sample and monitor the radioactivity in the air in the containment.

[0003] At the same time, when the chimney of a nuclear power plant is vented, a large amount of radioactive substances are directly discharged into the environment with the chimney exhaust in the event of an accident, causing direct and varying degrees of radioactive pollution to the environment around the nuclear power plant. In order to evaluate the total radioactive emissions to the atmosphere and the impact of the release of radioactive substances to the environment in the event of an accident, to guide emergency decision-making in the event of an accident, to understand the cause of the accident and its progress, and to support post-accident data analysis, it is urgent to develop an accident and post-accident radioactive aerosol, iodine, and inert gas sampling device to perform real-time sampling and monitoring of aerosols, iodine, and inert gases in chimney gaseous effluents. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to provide an aerosol, iodine and inert gas sampling device for accidents and post-accident situations, which can sample and monitor the distribution of radioactive gases in the containment, safety corridor, safety workshop and chimney exhaust systems under normal accident conditions and severe accident conditions, so as to cope with various radioactive leakage incidents that may occur in accident situations.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an aerosol, iodine and inert gas sampling device for accidents and after accidents, comprising an integrated aerosol and iodine sampling device, an inert gas adsorption bottle, and an air pump, wherein the sampling gas inlet is connected to the aerosol and iodine sampling device through a stop valve V1, the outlet end of the aerosol and iodine sampling device is connected to the purified gas outlet through a stop valve V3, the outlet end of the aerosol and iodine sampling device is connected to the air pump through a stop valve V4, a stop valve V6 and a manual regulating valve VR2, the outlet end of the air pump is connected to the sampling gas outlet through a stop valve V5, the outlet end of the aerosol and iodine sampling device is connected to the air pump through a stop valve V4 and a manual regulating valve VR1, the purified gas inlet is connected to the air pump through a filter, a stop valve V2, a stop valve V7 and a manual regulating valve VR3, the sampling gas inlet is connected to the air pump through a stop valve V1, a stop valve V7 and a manual regulating valve VR3, and the outlet end of the air pump is connected to the sampling gas outlet through an inert gas adsorption bottle.

[0006] In the above technical solution, a flow meter is provided at the rear end of the stop valve V4 for monitoring the mass flow of the sampled gas and detecting the gas temperature at the same time.

[0007] In the above technical solution, the inert gas adsorption bottle is connected to the outlet end of the vacuum pump and the pipeline of the sampling gas outlet through a quick-release joint. The quick-release joint is used to reduce the operation time in the event of an accident.

[0008] In the above technical solution, the aerosol and iodine sampling device is equipped with a self-heating sampling circuit, and a heating belt, a temperature sensor and an insulation layer are completely wrapped on the loop pipeline from the sampling gas inlet to the vacuum pump outlet. A heater is provided in the aerosol and iodine sampling device. The self-heating sampling circuit provides thermal protection for the aerosol and iodine sampling device and performs real-time temperature monitoring.

[0009] In the above technical solution, the device of the present invention includes an on-site processing display unit, which measures the sampling flow and temperature information in real time, provides an on-site alarm function and a data query function, and sends an alarm signal output to the upstream system.

[0010] In the above technical scheme, the device of the present invention includes a heating control box, which is connected to a heating belt, a temperature sensor and a heater to control the pipeline heating temperature and keep the temperature of the sampling gas inside the aerosol and iodine sampling device within a set range.

[0011] In the above technical solution, the device of the present invention includes an electrical box, which performs start and stop control and safety protection on the vacuum pump and distributes power to the heating control box.

[0012] The present invention is used for accident and post-accident aerosol, iodine and inert gas sampling devices, has a simple structure and is easy to use, and adopts three working modes, namely, a normal accident working mode, a severe accident working mode and a purification and flushing mode. The three modes are switched in an orderly manner according to the working conditions, ensuring that the various functions of the accident and post-accident aerosol, iodine and inert gas sampling devices respond in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of sampling principle of the device of the present invention.

[0014] Figure 2 The structure of the device of the present invention is shown in FIG. Figure 1 (Front of the device).

[0015] Figure 3 The structure of the device of the present invention is shown in FIG. Figure 2 (Back of the unit).

[0016] Among them: 1. Aerosol and iodine sampling device, 2. Inert gas adsorption bottle, 3. Self-heating sampling circuit, 4. On-site processing display unit, 5. Electrical box, 6. Heating control box, 7. Electrical junction box, 8. Support frame, 9. Vacuum pump, 10. Flow meter. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0018] It should be noted that when an element is referred to as being "fixed" to another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] like Figures 1 to 3As shown, an embodiment of the present invention provides an aerosol, iodine, and inert gas sampling device for accidents and after accidents, including an integrated aerosol and iodine sampling device 1, an inert gas adsorption bottle 2, and an air pump 9. The sampling gas inlet is connected to the aerosol and iodine sampling device 1 through a stop valve V1, and the outlet end of the aerosol and iodine sampling device 1 is connected to the purified gas outlet through a stop valve V3. The outlet end of the aerosol and iodine sampling device 1 is connected to the air pump 9 through a stop valve V4, a stop valve V6, and a manual regulating valve VR2. The outlet end of the air pump 9 is connected to the sampling gas outlet through a stop valve V5. The outlet end of the aerosol and iodine sampling device 1 is connected to the air pump 9 through a stop valve V4 and a manual regulating valve VR1. The purified gas inlet is connected to the air pump 9 through a filter, a stop valve V2, a stop valve V7, and a manual regulating valve VR3. The sampling gas inlet is connected to the air pump 9 through a stop valve V1, a stop valve V7, and a manual regulating valve VR3. The outlet end of the air pump 9 is connected to the sampling gas outlet through the inert gas adsorption bottle 2.

[0021] In the above embodiment, a flow meter 10 is provided at the rear end of the stop valve V4 for monitoring the mass flow of the sampled gas and detecting the gas temperature at the same time.

[0022] In the above embodiment, the inert gas adsorption bottle 2 is connected to the outlet end of the vacuum pump and the pipeline of the sampling gas outlet through a quick-release joint. The quick-release joint is used to reduce the operation time in the event of an accident.

[0023] In the above embodiment, the sampling gas is a high-humidity gas. When entering the aerosol and iodine sampling device 1, in order to prevent the sampling gas from condensing in the pipeline and various components, it is necessary to build a set of self-heating sampling circuits 3. The heating belt, temperature sensor and thermal insulation layer are all wrapped on the loop pipeline from the sampling gas inlet to the vacuum pump outlet. A heater is provided in the aerosol and iodine sampling device. The self-heating sampling circuit performs thermal protection on the aerosol and iodine sampling device and performs real-time temperature monitoring.

[0024] In the above embodiment, the device also includes an on-site processing display unit 4, which is used to measure the sampling flow and temperature information in real time, and provides on-site alarm function and data query function, and sends an alarm signal output to the upstream system.

[0025] In the above embodiment, the device also includes a heating control box 6, which is connected to the heating belt, temperature sensor and heater. The entire self-heating sampling circuit controls the start and stop of heating and temperature measurement through the heating control box, controls the pipeline heating temperature, and keeps the temperature of the sampling gas inside the aerosol and iodine sampling device within the set range.

[0026] In the above embodiment, the device further includes an electrical box 5 for starting and stopping the vacuum pump and performing safety protection, and distributing power to the heating control box.

[0027] In the above embodiment, the device further comprises an electrical connection box 7 for distributing power to the local processing display unit 4 , the flow meter 10 and the vacuum pump 9 .

[0028] In the above embodiment, the vacuum pump 9 is used to extract the sample gas and can withstand high temperature gas for a long time.

[0029] In the above embodiment, the sampling gas is extracted from the sampling gas inlet, flows through the stop valve V1, and enters the aerosol and iodine sampling device 1 from the air inlet. A large-area multi-aerosol filter paper and a multi-layer activated carbon filter box are used to complete the aerosol and iodine sampling. The outside of the sampling device uses a lead layer to shield the radioactivity in the sample. The pipeline between the sampling gas inlet and the air inlet should reduce bends and use a vertical pipeline to improve the aerosol transmission efficiency. The inert gas adsorption bottle 2 uses the built-in adsorption coating to complete the inert gas adsorption sampling of the sampled gas that has been filtered and absorbed of aerosols and iodine. The sampling is online during operation and the laboratory is offline for analysis.

[0030] This embodiment is used for aerosol, iodine and inert gas sampling devices during accidents and after accidents. Aerosol and iodine sampling is completed through the aerosol and iodine sampling device, and inert gas sampling is completed through the inert gas adsorption bottle, so as to comprehensively collect and sample and monitor the radioactive gaseous distribution flow.

[0031] When in normal accident working mode, stop valves V1 and V4 are opened, flow regulating valve VR1 is partially opened, stop valves V2, V3, V6, and V7 are closed, and the pipeline is kept free of bypass resistance. The sampling gas enters from the sampling gas inlet, passes through the stop valve V1, passes through the aerosol and iodine sampling device 1, and goes out through the stop valve V4, passes through the flow meter 10, and the vacuum pump 9 until it reaches the sampling device outlet. At this time, the design flow reaches the maximum and the sampling reaches equilibrium.

[0032] When in the purification and flushing mode, the stop valves V1, V4 and V7 are closed, the flow regulating valve VR1 is partially opened, and the stop valves V2 and V3 are opened. The flushing mode flushes the sampling pipeline, and the compressed air enters the aerosol and iodine sampling device through the stop valve V2 and exits through the stop valve V3, taking away the dust with weak adhesion.

[0033] When in the severe accident working mode, the stop valve V1 is opened, the stop valves V2, V3, and V5 are closed, V7 is opened first and then V6, and the bypass gas path is used for diversion to adjust the flow rate to 1 / 10 of the normal mode. At this time, the on-site processing display unit 4 is in the working mode, and the aerosol and iodine sampling device 1 can sample high-concentration aerosols and iodine components under severe accident conditions for a long time without sampling saturation. At the same time, the inert gas adsorption bottle effectively captures the inert gas, the sampling process is controllable, and the sampled samples are representative.

[0034] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A sampling device for aerosol, iodine and inert gas for accidents and after accidents, characterized by: The invention comprises an integrated aerosol and iodine sampling device, an inert gas adsorption bottle, and an air pump. The sampling gas inlet is connected to the aerosol and iodine sampling device through a stop valve V1, the outlet of the aerosol and iodine sampling device is connected to the purified gas outlet through a stop valve V3, the outlet of the aerosol and iodine sampling device is connected to the air pump through a stop valve V4, a stop valve V6, and a manual regulating valve VR2, the outlet of the air pump is connected to the sampling gas outlet through a stop valve V5, the outlet of the aerosol and iodine sampling device is connected to the air pump through a stop valve V4 and a manual regulating valve VR1, the purified gas inlet is connected to the filter, the stop valve V2, stop valve V7, and manual regulating valve VR3 are connected to the vacuum pump, the sampling gas inlet is connected to the vacuum pump through the stop valve V1, stop valve V7, and manual regulating valve VR3, and the outlet of the vacuum pump is connected to the sampling gas outlet through the inert gas adsorption bottle. The aerosol and iodine sampling device is equipped with a set of self-heating sampling circuits, and the loop pipeline from the sampling gas inlet to the vacuum pump outlet is fully encapsulated with a heating belt, a temperature sensor, and a heat insulation layer. A heater is provided in the aerosol and iodine sampling device, and the self-heating sampling circuit performs heat tracing protection on the aerosol and iodine sampling device, and performs real-time temperature monitoring; The aerosol, iodine and inert gas sampling device used in accidents and after accidents completes aerosol and iodine sampling through the aerosol and iodine sampling device, completes inert gas sampling through the inert gas adsorption bottle, and comprehensively collects and samples the radioactive gas distribution flow for monitoring. Specifically, it is divided into three working modes: When in the normal accident working mode, the stop valves V1 and V4 are opened, the flow regulating valve VR1 is partially opened, the stop valves V2, V3, V6, and V7 are closed, and the pipeline is kept free of bypass resistance. The sampling gas enters from the sampling gas inlet, passes through the stop valve V1, passes through the aerosol and iodine sampling device, and goes out of the stop valve V4, passes through the flow meter, and is pumped out until it reaches the outlet of the sampling device. At this time, the design flow reaches the maximum, and the sampling reaches equilibrium; When in the purification and flushing mode, the stop valves V1, V4 and V7 are closed, the flow regulating valve VR1 is partially opened, the stop valves V2 and V3 are opened, and the flushing mode flushes the sampling pipeline. The compressed air enters the aerosol and iodine sampling device through the stop valve V2 and exits through the stop valve V3, taking away the dust with weak adhesion; When in the severe accident working mode, the stop valve V1 is opened, the stop valves V2, V3, and V5 are closed, V7 is opened first and then V6, and the bypass gas path is used for diversion to adjust the flow rate to 1 / 10 of the normal mode. At this time, the on-site processing display unit is in the working mode, and the aerosol and iodine sampling device can sample high-concentration aerosols and iodine components under severe accident conditions for a long time without sampling saturation. At the same time, the inert gas adsorption bottle effectively captures the inert gas.

2. The aerosol, iodine and inert gas sampling device for accidents and after accidents according to claim 1 is characterized by: A flow meter is provided at the rear end of the stop valve V4.

3. The aerosol, iodine and inert gas sampling device for accidents and after accidents according to claim 1 is characterized by: The inert gas adsorption bottle is connected to the outlet end of the vacuum pump and the pipeline of the sampling gas outlet through a quick-release joint.

4. The aerosol, iodine and inert gas sampling device for accidents and after accidents according to claim 1 is characterized by: It includes a local processing display unit, which measures the sampling flow and temperature information in real time, provides local alarm function and data query function, and sends alarm signal output to the upstream system.

5. The aerosol, iodine and inert gas sampling device for accidents and after accidents according to claim 1 is characterized by: The device comprises a heating control box, which is connected with a heating belt, a temperature sensor and a heater to control the pipeline heating temperature and keep the temperature of the sampling gas inside the aerosol and iodine sampling device within a set range.

6. The aerosol, iodine and inert gas sampling device for accidents and after accidents according to claim 5 is characterized by: It includes an electrical box, which controls the start and stop of the vacuum pump and provides safety protection, and distributes power to the heating control box.

Images