Uranium hexafluoride simulation leakage monitoring system

Abstract

The invention relates to the technical field of radiation detection, in particular to a uranium hexafluoride simulation leakage monitoring system. The uranium hexafluoride simulation leakage monitoring system comprises a feeding chamber, the feeding chamber is provided with a test bed, the test bed is provided with a temperature adjusting device, and the temperature adjusting device is used for adjusting the temperature of a storage container storing uranium hexafluoride through a coil pipe so as to start / stop gasification of solid uranium hexafluoride in the storage container. The storage container is in flange connection with a transmission pipeline, the transmission pipeline is in flange connection with leakage simulation equipment of the monitoring chamber through a valve, and a first air supply and exhaust filter is further arranged in the feeding chamber; and the monitoring chamber is provided with leakage simulation equipment, a second air supply and exhaust filter, a nitrogen injection interface and monitoring equipment. According to the uranium hexafluoride simulation leakage monitoring system, leakage of uranium hexafluoride can be safely simulated, and leakage related data can be obtained through monitoring.

Description

Technical Field

[0001] The present application relates to the field of radiation detection technology, and in particular to a uranium hexafluoride simulated leakage monitoring system. Background Art

[0002] Uranium hexafluoride (UF6) is a key compound in the production process of nuclear fuel cycle facilities, and its handling and safe management are of vital importance. At room temperature and pressure, UF6 is in the form of a white solid powder, but it can sublime into gas at 56.4°C. Due to its active chemical properties, strong oxidizing, toxic and easy to spread, the leakage of UF6 may cause serious harm to operators and the environment.

[0003] Existing nuclear fuel cycle processing equipment mainly focuses on UF6 feeding, unloading, sampling and exhaust gas treatment, but there are few simulation systems for UF6 leakage. There is a lack of systems that can study the characteristics of uranium hexafluoride leakage and safely obtain relevant data. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the purpose of the present application is to provide a uranium hexafluoride simulation leakage monitoring system, which is convenient for simulating the leakage and monitoring of UF6.

[0005] To achieve the above objectives, the present application provides a uranium hexafluoride simulated leakage monitoring system, comprising:

[0006] A feed room, wherein the feed room is provided with a test bench, and a temperature control device is provided on the test bench, and the temperature control device is used to control the temperature of a storage container storing uranium hexafluoride through a coil so as to start / stop gasification of solid uranium hexafluoride in the storage container, and the storage container is flange-connected with a transmission pipeline, and the transmission pipeline is flange-connected with a leakage simulation device in the monitoring room through a valve, and a first air supply and exhaust filter is also provided in the feed room;

[0007] A monitoring room, wherein the monitoring room is provided with a leakage simulation device, a second air supply and exhaust filter, a nitrogen injection interface and a monitoring device, wherein the monitoring device includes: any one or a combination of an HF concentration detector, a flow field detection device, a pressure detection device, a wet temperature detection device and an aerosol particle size monitoring device;

[0008] Wherein, the first air supply and exhaust filter and the second air exhaust filter are connected to the exhaust gas treatment system.

[0009] Furthermore, the leakage simulation device includes a gap leakage simulation component, a hole leakage simulation component and a valve leakage simulation component.

[0010] Furthermore, the first air supply and exhaust filter and the second air supply and exhaust filter are both air supply and exhaust filters equipped with polyvinyl chloride fiber filter elements.

[0011] Furthermore, the feed chamber is also provided with an HF concentration detector and a temperature and humidity detection device.

[0012] Furthermore, the feeding chamber and the monitoring chamber are airtight closed structures, and the bottom surfaces of the feeding chamber and the monitoring chamber are paved with epoxy resin self-leveling or polyvinyl chloride plastic floors.

[0013] Furthermore, the feeding chamber and the monitoring chamber are both provided with a sealed single-opening door.

[0014] Furthermore, the monitoring room is provided with a plurality of HF concentration monitors, and the monitoring room is provided with transparent sealed observation windows in three dimensional directions, the transparent sealed observation windows are made of organic glass resistant to corrosion by HF and its aqueous solution, and a high-speed camera for photographing the interior of the monitoring room is provided outside the transparent sealed observation window.

[0015] Furthermore, the feed chamber is provided with at least one transparent sealed observation window, and the transparent sealed observation window is made of organic glass resistant to corrosion by HF and its aqueous solution.

[0016] Furthermore, an atomizing nozzle is also provided on the top of the monitoring chamber, and the atomizing nozzle is used to spray water mist vertically downward from the top of the monitoring chamber.

[0017] Furthermore, it also includes:

[0018] A heat preservation device is used to insulate the transmission pipeline so that the uranium hexafluoride in the transmission pipeline remains in a gaseous state.

[0019] The uranium hexafluoride simulation leakage monitoring system provided in the present application can safely simulate the leakage of uranium hexafluoride, and monitor and obtain leakage-related data, which can provide a reference for preventing the leakage of uranium hexafluoride and post-leakage treatment.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the uranium hexafluoride simulation leakage monitoring system of the present application. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0024] It should be understood that the various steps described in the method implementation of the present application can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this respect.

[0025] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0026] It should be noted that the modifications of "one" and "plurality" mentioned in this application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more". "Plurality" should be understood as two or more.

[0027] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0028] Example 1

[0029] One embodiment of the present application provides a uranium hexafluoride simulated leakage monitoring system. Figure 1 This is a flow chart of the uranium hexafluoride simulation leakage monitoring system of the present application, which will be referred to below Figure 1 The uranium hexafluoride simulated leakage monitoring system of the present application is described in detail, including:

[0030] A feeding chamber 100, wherein the feeding chamber 100 is provided with a test bench 101, on which a temperature regulating device 102 is provided, and the temperature regulating device 102 is used to regulate the temperature of a storage container 103 storing uranium hexafluoride through a coil so as to start / stop gasification of solid uranium hexafluoride in the storage container 103, wherein the storage container 103 is flange-connected with a transmission pipeline, and the transmission pipeline is flange-connected with a leakage simulation device 201 of the monitoring chamber 200 through a valve, and a first air supply and exhaust filter 104 is further provided in the feeding chamber 100;

[0031] The monitoring room 200 is provided with a leakage simulation device 201, a second air supply and exhaust filter 203, a nitrogen injection interface and a monitoring device. The monitoring device includes any one or a combination of an HF concentration detector, a flow field detection device, a pressure detection device, a wet temperature detection device and an aerosol particle size monitoring device.

[0032] Wherein, the first air supply and exhaust filter 104 and the second air exhaust filter 203 are connected to the exhaust gas treatment system.

[0033] It should be noted that the tail gas treatment system is a system for treating a mixture gas including a small amount of hydrogen fluoride, uranium hexafluoride and uranyl fluoride.

[0034] In this embodiment, the exhaust gas treatment system is composed of a leaching tower for spraying sodium carbonate solution, a circulation tank, a heater and a filter; wherein the leaching tower is used to react the exhaust gas entering the leaching tower from the bottom of the leaching tower with the sodium carbonate solution; the circulation tank is used to circulate and replenish the leaching solution; the heater is used to heat and dehumidify the leached exhaust gas; the filter is used to filter and discharge the heated and dehumidified exhaust gas after testing.

[0035] In this embodiment, the leakage simulation device 201 includes a gap leakage simulation component, a hole leakage simulation component and a valve leakage simulation component to respectively simulate the leakage of uranium hexafluoride at the gap, hole and valve.

[0036] In this embodiment, the first air supply and exhaust filter 104 and the second air supply and exhaust filter 203 are both air supply and exhaust filters equipped with polyvinyl chloride fiber filter elements.

[0037] In this embodiment, the feed chamber 100 is also provided with an HF concentration detector and a temperature and humidity detection device for detecting leakage of uranium hexafluoride in the feed chamber to prevent test personnel from entering when leakage occurs in the feed chamber.

[0038] In this embodiment, the feeding chamber 100 and the monitoring chamber 200 are airtight closed structures. The bottom surfaces of the feeding chamber 100 and the monitoring chamber 200 are paved with epoxy resin self-leveling or polyvinyl chloride plastic floors. During the experiment, the walls and the floor of the monitoring chamber 200 are also paved with plastic film. After the test, the plastic film is peeled off and treated as solid waste.

[0039] In this embodiment, the feeding chamber 100 and the monitoring chamber 200 are both light steel structures.

[0040] In this embodiment, the feeding room 100 and the monitoring room 200 are both provided with two sealed single-opening doors for the entry of equipment and personnel.

[0041] In this embodiment, in order to visually observe the situation of the feeding chamber 100, the feeding chamber 100 is provided with at least one transparent sealed observation window, and the transparent sealed observation window is made of organic glass resistant to corrosion by HF and its aqueous solution.

[0042] In this embodiment, in order to monitor the situation and related data of uranium hexafluoride leakage in real time, temperature and humidity detection equipment and multiple HF concentration monitors are installed in the monitoring room 200. The monitoring room 200 is provided with transparent sealed observation windows in three dimensions. The transparent sealed observation windows are made of organic glass resistant to corrosion by HF and its aqueous solution. A high-speed camera for photographing the interior of the monitoring room is arranged outside the transparent sealed observation window.

[0043] In this embodiment, an atomizing nozzle 202 is further disposed on the top of the monitoring chamber 200 , and the atomizing nozzle 202 is used to spray water mist vertically downward from the top of the monitoring chamber 200 .

[0044] It is understandable that the atomizing nozzle 202 realizes the spraying of water mist that can cover the area of ​​the monitoring room through equipment such as a pump, a water tank, and a solenoid valve.

[0045] In this embodiment, the atomizing nozzle 202 is a pressure nozzle, and two guide grooves are arranged on the inner wall of the nozzle. Under the action of pressure, the liquid is ejected from the nozzle along a certain angle from the tangential direction and sprayed evenly to form an inverted cone-shaped atomized body.

[0046] In this embodiment, in order to prevent uranium hexafluoride from condensing and blocking the pipeline, a heat preservation device is further provided, and the heat preservation device is used to keep the transmission pipeline warm so that the uranium hexafluoride in the transmission pipeline remains in a gaseous state.

[0047] In this embodiment, a flow meter is installed on the transmission pipeline to detect the leakage rate.

[0048] It is understandable that the heat preservation device will be connected to a controller such as a PLC and can be continuously controlled.

[0049] In this embodiment, the material of the heat preservation device is stainless steel.

[0050] The embodiments of the present application can use dry nitrogen as the environmental condition to detect the leakage of uranium hexafluoride gas in the monitoring room, or can use air as the environmental condition.

[0051] When air is used as the environmental condition, the process of leak simulation monitoring is as follows: a plastic film is laid on the inner wall of the monitoring room 200 (the film is replaced after the experiment as a temporary storage of radioactive solid waste); after heating the uranium hexafluoride using a temperature control device, the regulating valve on the transmission pipeline is adjusted to release the uranium hexafluoride gas to the monitoring room 200 through the simulated leakage device 201; after the uranium hexafluoride gas is released into the monitoring room 200, it is quickly condensed and hydrolyzed with water vapor in the air to generate UO2F2 solid particles and HF droplets to form "white mist" that diffuses in the air of the monitoring room 200, and the diffusion and separation of the "white mist" can be observed through the transparent sealed observation window of the monitoring room 200. The HF diffusion situation can be quantified by the HF monitor installed in the monitoring room 200; after the leakage simulation experiment is completed, UO2F2 solid particles and some HF small droplets settle and adhere to the side walls and floor of the monitoring room 200, and some HF droplets and residual incompletely reacted uranium hexafluoride are dispersed in the air of the monitoring room 200. At this time, the atomizing nozzle 202 continuously sprays atomized water into the monitoring room 200 to fully react with the residual uranium hexafluoride gas to generate UO2F2 solid particles and HF small droplets; the supply and exhaust air in the monitoring room 200 is started, and the air in the monitoring room (including HF) is transported to the exhaust gas treatment system for deacidification and purification through the adjustment of the pipeline valve.

[0052] When nitrogen is used as the environmental condition, the process of leak simulation monitoring is as follows: dry and clean N2 is introduced into the monitoring room 200 in advance through the nitrogen injection interface to replace the indoor air of the monitoring room 200, and it is strictly forbidden for any personnel to enter and stay in the monitoring room 200; after the uranium hexafluoride is heated by the temperature control device, the regulating valve on the transmission pipeline is adjusted, and then the uranium hexafluoride gas is released to the monitoring room 200 through the simulated leakage device 201; after the leakage simulation experiment is completed, N2 is continuously introduced into the monitoring room 200 to replace the uranium hexafluoride released by the leakage simulation device 201, and when the replacement of the uranium hexafluoride in the monitoring room is completed, the introduction is stopped; the atomizing nozzle 202 sprays atomized water into the monitoring room 200 to make it fully react with the residual uranium hexafluoride gas in the monitoring room 200 to generate UO2F2 solid particles and HF droplets; the supply and exhaust air in the monitoring room 200 is started, and the air (including HF) in the monitoring room is transported to the tail gas treatment system for deacidification and purification through the adjustment of the pipeline valve.

[0053] The above description is only a partial embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

[0054] In addition, although each operation is described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the application. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0055] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A uranium hexafluoride simulated leakage monitoring system, characterized in that: include: A feed room, wherein the feed room is provided with a test bench, and a temperature control device is provided on the test bench, and the temperature control device is used to control the temperature of a storage container storing uranium hexafluoride through a coil so as to start / stop gasification of solid uranium hexafluoride in the storage container, and the storage container is flange-connected with a transmission pipeline, and the transmission pipeline is flange-connected with a leakage simulation device in the monitoring room through a valve, and a first air supply and exhaust filter is also provided in the feed room; A monitoring room, wherein the monitoring room is provided with a leakage simulation device, a second air supply and exhaust filter, a nitrogen injection interface and a monitoring device, wherein the monitoring device includes: any one or a combination of an HF concentration detector, a flow field detection device, a pressure detection device, a wet temperature detection device and an aerosol particle size monitoring device; Wherein, the first air supply and exhaust filter and the second air exhaust filter are connected to the exhaust gas treatment system.

2. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: The leakage simulation device includes a gap leakage simulation part, a hole leakage simulation part and a valve leakage simulation part.

3. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: The first air supply and exhaust filter and the second air supply and exhaust filter are both air supply and exhaust filters equipped with polyvinyl chloride fiber filter elements.

4. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: The feeding chamber is also provided with an HF concentration detector and a temperature and humidity detection device.

5. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: The feeding chamber and the monitoring chamber are airtight closed structures, and the bottom surfaces of the feeding chamber and the monitoring chamber are paved with epoxy resin self-leveling or polyvinyl chloride plastic floors.

6. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: The feeding chamber and the monitoring chamber are both provided with sealed single-opening doors.

7. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: The monitoring room is provided with a plurality of HF concentration monitors. The monitoring room is provided with transparent sealed observation windows in three dimensional directions. The transparent sealed observation windows are made of organic glass resistant to corrosion by HF and its aqueous solution. A high-speed camera for photographing the interior of the monitoring room is provided outside the transparent sealed observation window.

8. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: The feed chamber is provided with at least one transparent sealed observation window, and the transparent sealed observation window is made of organic glass resistant to corrosion by HF and its aqueous solution.

9. The simulated uranium hexafluoride leakage monitoring system according to claim 1, characterized in that: The top of the monitoring chamber is also provided with an atomizing nozzle, and the atomizing nozzle is used for spraying water mist vertically downward from the top of the monitoring chamber.

10. The uranium hexafluoride simulated leakage monitoring system according to claim 1, characterized in that: Also includes: A heat preservation device is used to insulate the transmission pipeline so that the uranium hexafluoride in the transmission pipeline remains in a gaseous state.

Images