Density measuring device for spent fuel dissolving solution

Abstract

The invention relates to the technical field of spent fuel, and provides a spent fuel dissolving solution density measuring device which comprises a measuring assembly, a pumping and draining assembly, a cleaning assembly, a gas supply pipeline and a flow path switching assembly. The measuring assembly is used for measuring the density of the spent fuel dissolving solution; the pumping and discharging assembly is used for pumping and discharging the spent fuel dissolving liquid into and out of the measuring assembly; the cleaning assembly is used for providing cleaning liquid; the gas supply pipeline is used for providing blow-drying gas; the flow path switching assembly comprises a reversing structure communicated with the measuring assembly, the reversing structure is provided with a first port, a second port and a third port, the first port is communicated with the air supply pipeline, the second port is communicated with the pumping and draining assembly, and the third port is communicated with the cleaning assembly; the reversing structure can conduct a flow path between any one of the first port, the second port and the third port and the measuring assembly. According to the density measuring device provided by the embodiment of the invention, the measuring, sampling, cleaning and blow-drying functions involved in the measuring process can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of spent fuel, and in particular, to a density measurement device for spent fuel dissolution solution. Background Art

[0002] This section aims to provide background or context for the implementation of the present application. The description herein is not admitted to be prior art merely because it is included in this section.

[0003] Spent fuel is nuclear fuel that has been used in a nuclear reactor and reached the expected burnup, usually generated by nuclear power plants or research nuclear reactors. Spent fuel dissolution solution is a mixture formed by mixing spent fuel in a solvent.

[0004] When performing material balance calculations on spent fuel dissolution solution, it is necessary to accurately measure the density of the spent fuel dissolution solution. In related technologies, there are usually two ways to measure the density of spent fuel dissolution solution. One is to use a bench-top densitometer for measurement. However, the bench-top densitometer is highly integrated, with a complex structure, and the material is not resistant to radiation and acid, so it is not suitable for use in a hot cell. The other is to use a split-type densitometer for measurement. However, the process of measuring the density of spent fuel dissolution solution involves multiple steps such as measurement, sampling, cleaning, and drying, and the split-type densitometer cannot achieve all functions. Summary of the Invention

[0005] In view of this, embodiments of the present application are expected to provide a density measurement device for spent fuel dissolution solution, which can achieve the functions of measurement, sampling, cleaning, and drying involved in the measurement process.

[0006] Embodiments of the present application provide a density measurement device for spent fuel dissolution solution, including:

[0007] A measurement component for measuring the density of the spent fuel dissolution solution;

[0008] A pumping and discharging component for pumping the spent fuel dissolution solution into and out of the measurement component;

[0009] A cleaning component for providing a cleaning liquid;

[0010] An air supply pipeline for providing a drying gas;

[0011] A flow path switching component, including a commutation structure communicated with the measurement component. The commutation structure has a first port, a second port, and a third port. The first port is communicated with the air supply pipeline, the second port is communicated with the pumping and discharging component, the third port is communicated with the cleaning component, and the commutation structure can conduct the flow path between any one of the first port, the second port, and the third port and the measurement component.

[0012] In some embodiments, the flow path switching component includes a first valve, a second valve, and a third valve. The first valve is disposed on the gas supply pipeline to conduct or cut off the gas supply pipeline;

[0013] The exhaust component includes an exhaust pipeline, and the exhaust pipeline communicates with the second port. The second valve is disposed on the exhaust pipeline to conduct or cut off the exhaust pipeline;

[0014] The cleaning component includes a cleaning pipeline, and the cleaning pipeline communicates with the third port. The third valve is disposed on the cleaning pipeline to conduct or cut off the cleaning pipeline;

[0015] One of the first valve, the second valve, and the third valve is located above the commutation structure, and the other two are respectively located on opposite sides of the commutation structure along the first direction. The up-down direction is perpendicular to the first direction.

[0016] In some embodiments, the measurement component, the exhaust component, and the flow path switching component are all disposed in a hot chamber. The hot chamber is filled with the drying gas, and the gas supply pipeline communicates with the hot chamber.

[0017] In some embodiments, the material of the gas supply pipeline is stainless steel.

[0018] In some embodiments, at least part of the material of the exhaust component is stainless steel.

[0019] In some embodiments, at least part of the material of the flow path switching component is stainless steel.

[0020] In some embodiments, the exhaust component includes a bracket, an exhaust structure, and an exhaust pipeline. The exhaust structure includes a transmission rod, a piston head, and an exhaust bottle. The transmission rod is connected to the piston head. The piston head is disposed in the exhaust bottle. The exhaust bottle communicates with the exhaust pipeline and is disposed on the bracket. The transmission rod has a discharge position and a suction position. The discharge position is above the exhaust bottle, and the suction position is above the discharge position. The transmission rod can move back and forth between the discharge position and the suction position to drive the piston head to move back and forth in the exhaust bottle along the up-down direction.

[0021] In some embodiments, the exhaust structure includes a limit stop and a limit platform. The limit stop is disposed on the bracket and above the exhaust bottle. The transmission rod passes through the limit stop, and the limit platform is connected to the peripheral side wall of the transmission rod and above the limit stop;

[0022] The limit platform is used to abut against the limit stop to limit the transmission rod at the discharge position.

[0023] In some embodiments, the bracket is formed with a positioning hole and a stop platform. The transmission rod passes through the positioning hole, and the stop platform protrudes from the peripheral side wall of the positioning hole. The pumping and discharging structure includes a stop strip connected to the peripheral side wall of the transmission rod. The transmission rod rotates to enable the stop strip to avoid or abut against the stop platform;

[0024] When the stop strip avoids the stop platform, the transmission rod can reciprocate between the discharging position and the suction position; when the stop strip abuts against the stop platform, the transmission rod is restricted at the suction position.

[0025] In some embodiments, the pumping and discharging structure includes a limiting flap located above the pumping and discharging bottle. A flange is provided on the peripheral side wall of the transmission rod. The limiting flap is slidably arranged on the bracket in a first direction. The limiting flap is formed with an avoidance hole and a stop hole that communicate with each other. The transmission rod passes through the avoidance hole and can slide between the avoidance hole and the stop hole. The limiting flap has an avoidance position and a stop position in the first direction;

[0026] When the limiting flap is in the avoidance position, the flange can pass through the avoidance hole; when the limiting flap is in the stop position, the flange abuts against the surrounding part of the stop hole. The first direction is perpendicular to the up-down direction.

[0027] In some embodiments, the pumping and discharging structure includes a limiting rod connected to the transmission rod. The limiting flap has a first limiting hole and a second limiting hole that are spaced apart in the first direction. When the limiting flap is in the avoidance position, the limiting rod passes through the first limiting hole; when the limiting flap is in the stop position, the limiting rod passes through the second limiting hole.

[0028] In some embodiments, there are multiple limiting flaps, and the multiple limiting flaps are spaced apart in the up-down direction.

[0029] In some embodiments, the remaining limiting flaps below the highest limiting flap are provided with handles, and adjacent two handles are respectively located on opposite sides of the first direction.

[0030] The density measurement device for spent fuel dissolution liquid provided by the embodiments of the present application selectively conducts the flow path between any one of the first port, the second port, and the third port and the measurement assembly through the commutation structure. The density measurement device can realize the functions of measurement, sampling, cleaning, and drying involved in the measurement process, with perfect functions, meeting the density measurement requirements of spent fuel dissolution liquid. Description of the Drawings

[0031] Figure 1 Schematic structural diagram of the density measurement device provided by some embodiments of the present application;

[0032] Figure 2 For Figure 1 Enlarged view of part A in

[0033] Figure 3 Schematic structural diagram of the pumping and exhausting assembly provided by some embodiments of the present application;

[0034] Figure 4 For Figure 3 Schematic structural diagram of the shown structure from another perspective;

[0035] Figure 5 For Figure 4 Enlarged view of part B in

[0036] Figure 6 Schematic structural diagram of the assembly of the transmission rod, the stop bar and the bracket provided by some embodiments of the present application, wherein only part of the bracket is shown;

[0037] Figure 7 Schematic structural diagram of the limit retaining piece provided by some embodiments of the present application.

[0038] Explanation of reference numerals

[0039] 100, density measurement device; 200, hot chamber;

[0040] 1, measurement component; 11, U-shaped tube; 12, vibrator;

[0041] 2, pumping and exhausting component; 2a, pumping and exhausting pipeline;

[0042] 21, bracket; 21a, positioning hole; 21b, stop platform;

[0043] 22, pumping and exhausting structure;

[0044] 221, transmission rod; 221a, discharge position; 221b, suction position; 2211, flange; 2212, operating handle;

[0045] 222, piston head; 223, pumping and exhausting bottle;

[0046] 224, limit retaining piece; 224a, avoidance hole; 224b, stop hole; 224c, first limit hole; 224d, second limit hole; 2241, handle;

[0047] 225, limit platform; 226, stop bar; 227, limit rod;

[0048] 23, fixing piece; 231, fixing shell; 231a, fixing cavity; 231b, inlet and outlet; 232, fixing head; 233, connecting rod;

[0049] 24. Clamping member;

[0050] 3. Cleaning assembly; 3a. Cleaning pipeline;

[0051] 4. Air supply pipeline;

[0052] 5. Flow path switching assembly; 5a. First valve; 5b. Second valve; 5c. Third valve;

[0053] 51. Commutation structure; 51a. First port; 51b. Second port; 51c. Third port; 51d. Fourth port;

[0054] 52. Connecting pipeline;

[0055] 6. Processor. Detailed implementation manners

[0056] The following further describes the implementation manners of the present application in detail in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0057] In the description of the embodiments of the present application, the "first direction" azimuth or positional relationship is based on Figure 2 , Figure 3 and Figure 7 the shown azimuth or positional relationship, and the "up and down direction" azimuth or positional relationship is based on Figure 2 , Figure 3 and Figure 4 the shown azimuth or positional relationship. It should be understood that these azimuth terms are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0058] In the various specific technical features and each embodiment described in the detailed implementation manners, they can be combined in any appropriate manner without contradiction. For example, different implementation manners can be formed by combining different specific technical features / embodiments. To avoid unnecessary repetition, various possible combination manners of the various specific technical features / embodiments in the present application will not be described separately. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0059] It should be noted that in the present application, "down" refers to the direction towards the ground, and "up" is the direction opposite to "down". "Plural" refers to a quantity including two or more. In the present application, the volume unit "mL" is milliliters, and the density unit "g / mL" is grams per milliliter.

[0060] Please refer to Figures 1 to 7 Figures 1 to 7 An embodiment of the present application provides a density measurement device 100 for spent fuel dissolution liquid, which includes a measurement component 1, a pumping and discharging component 2, a cleaning component 3, a gas supply pipeline 4, and a flow path switching component 5. The measurement component 1 is used to measure the density of the spent fuel dissolution liquid; the pumping and discharging component 2 is used to pump the spent fuel dissolution liquid into and out of the measurement component 1; the cleaning component 3 is used to provide a cleaning liquid; the gas supply pipeline 4 is used to provide a drying gas.

[0061] Specifically, when it is necessary to measure the density of the spent fuel dissolution liquid, the pumping and discharging component 2 pumps the spent fuel dissolution liquid into the measurement component 1, and the measurement component 1 measures the density of the spent fuel dissolution liquid. After the measurement is completed, the pumping and discharging component 2 discharges the spent fuel dissolution liquid in the measurement component 1.

[0062] The cleaning component 3 is used to provide a cleaning liquid to the measurement component 1 to clean the spent fuel dissolution liquid remaining in the measurement component 1, etc., and reduce the acidic corrosion and radiation damage of the spent fuel dissolution liquid to the measurement component 1. The gas supply pipeline 4 is used to provide a drying gas to the measurement component 1, and the drying gas can dry the residual liquid in the measurement component 1, such as the spent fuel dissolution liquid, the cleaning liquid, and other mixed solutions. Through the coordinated cooperation of the cleaning component 3 and the gas supply pipeline 4, it is ensured that the measurement component 1 is dry and clean, the service life of the measurement component 1 is extended, and subsequent measurement errors are prevented.

[0063] The flow path switching component 5 includes a commutation structure 51 communicated with the measurement component 1. The commutation structure 51 has a first port 51a, a second port 51b, and a third port 51c. The first port 51a is communicated with the gas supply pipeline 4, the second port 51b is communicated with the pumping and discharging component 2, the third port 51c is communicated with the cleaning component 3, and the commutation structure 51 can conduct the flow path between any one of the first port 51a, the second port 51b, and the third port 51c and the measurement component 1.

[0064] Exemplarily, please refer to Figure 1 and Figure 2 Figure 2 The flow path switching component 5 includes a connecting pipeline 52. The commutation structure 51 further has a fourth port 51d, and the connecting pipeline 52 communicates the fourth port 51d and the measurement component 1. In this way, the commutation structure 51 is kept communicated with the measurement component 1 through the connecting pipeline 52.

[0065] When the flow path between the first port 51a and the measurement component 1 is conducted by the commutation structure 51, the air supply pipeline 4 is communicated with the measurement component 1, and the air supply pipeline 4 can supply the drying gas into the measurement component 1. When the flow path between the second port 51b and the measurement component 1 is conducted by the commutation structure 51, the pumping and discharging component 2 is communicated with the measurement component 1, and the pumping and discharging component 2 can pump the spent fuel dissolving liquid into and out of the measurement component 1. When the flow path between the third port 51c and the measurement component 1 is conducted by the commutation structure 51, the cleaning component 3 is communicated with the measurement component 1, and the cleaning component 3 can supply the cleaning liquid to the measurement component 1.

[0066] It should be noted that taking the commutation structure 51 conducting the flow path between the first port 51a and the measurement component 1 as an example, at this time, the commutation structure 51 will not conduct the flow paths between the second port 51b and the third port 51c and the measurement component 1. That is, only the air supply pipeline 4 can supply the drying gas into the measurement component 1, the measurement component 1 cannot pump in or discharge the spent fuel dissolving liquid through the pumping and discharging component 2, and the cleaning component 3 cannot supply the cleaning liquid to the measurement component 1. The situation where the commutation structure 51 conducts the flow path between the second port 51b and the measurement component 1, or the commutation structure 51 conducts the flow path between the third port 51c and the measurement component 1 is the same as the foregoing situation, and will not be elaborated here.

[0067] Exemplarily, during the process of measuring the density of the spent fuel dissolving liquid, first, the commutation structure 51 first conducts the flow path between the second port 51b and the measurement component 1, and the pumping and discharging component 2 first pumps the spent fuel dissolving liquid into the measurement component 1. After the measurement component 1 finishes the measurement, the pumping and discharging component 2 then discharges the spent fuel dissolving liquid from the measurement component 1. Here, the spent fuel dissolving liquid in the measurement component 1 is discharged into the sampling container to achieve quantitative sampling. Secondly, the commutation structure 51 then conducts the flow path between the third port 51c and the measurement component 1, and the cleaning component 3 supplies the cleaning liquid to the measurement component 1 to clean the spent fuel dissolving liquid and the like remaining in the measurement component 1. Thirdly, the commutation structure 51 then conducts the flow path between the first port 51a and the measurement component 1, and the air supply pipeline 4 supplies the drying gas to the measurement component 1, and the drying gas dries the residual liquid in the measurement component 1 to ensure that the measurement component 1 is clean and dry. In this way, by selectively conducting the flow path between any one of the first port 51a, the second port 51b, and the third port 51c and the measurement component 1 by the commutation structure 51, the density measuring device 100 can realize the functions of measurement, sampling, cleaning, and drying involved in the measurement process.

[0068] The density measurement device 100 for spent fuel dissolution solution provided by the embodiments of the present application can selectively conduct the flow path between any one of the first port 51a, the second port 51b, and the third port 51c and the measurement component 1 through the commutation structure 51. The density measurement device 100 can realize the functions of measurement, sampling, cleaning, and drying involved in the measurement process, with perfect functions, meeting the density measurement requirements of spent fuel dissolution solution.

[0069] In one embodiment, please refer to Figure 1 , the measurement component 1 includes a U-shaped tube 11 and a vibrator 12, and at least a part of the U-shaped tube 11 is located inside the vibrator 12. The U-shaped tube 11 is used to hold the spent fuel dissolution solution, and the vibrator 12 is used to provide a power source to make the U-shaped tube 11 vibrate at a high frequency, so as to measure the density of the spent fuel dissolution solution. That is to say, the measurement component 1 provided by the embodiments of the present application is an oscillating tube densitometer.

[0070] The working principle of the oscillating tube densitometer is to suck the spent fuel dissolution solution into the U-shaped tube 11. Through the external excitation of the vibrator 12, the U-shaped tube 11 generates an inherent vibration frequency, and the density of the spent fuel dissolution solution will directly affect the vibration frequency. Specifically, the greater the density of the spent fuel dissolution solution, the lower the vibration frequency, and vice versa, so as to measure the density of the spent fuel dissolution solution, which is convenient, fast, and has high measurement accuracy.

[0071] In some embodiments, please refer to Figure 2 , the flow path switching component 5 includes a first valve 5a, a second valve 5b, and a third valve 5c. The first valve 5a is arranged on the gas supply pipeline 4 to conduct or cut off the gas supply pipeline 4. Specifically, when the first valve 5a conducts the gas supply pipeline 4, the gas supply pipeline 4 is connected to the measurement component 1, and the drying gas can flow to the measurement component 1 through the gas supply pipeline 4 and the commutation structure 51; when the first valve 5a cuts off the gas supply pipeline 4, the gas supply pipeline 4 is not connected to the measurement component 1, and the drying gas cannot flow to the measurement component 1 through the gas supply pipeline 4 and the commutation structure 51.

[0072] The pumping and discharging component 2 includes a pumping and discharging pipeline 2a. The pumping and discharging pipeline 2a is connected to the second port 51b. The second valve 5b is arranged on the pumping and discharging pipeline 2a to conduct or cut off the pumping and discharging pipeline 2a. Specifically, when the second valve 5b conducts the pumping and discharging pipeline 2a, the pumping and discharging pipeline 2a is connected to the measurement component 1, and the pumping and discharging component 2 can pump the spent fuel dissolution solution into and out of the measurement component 1; when the second valve 5b cuts off the pumping and discharging pipeline 2a, the pumping and discharging pipeline 2a is not connected to the measurement component 1, and the pumping and discharging component 2 cannot pump the spent fuel dissolution solution into and out of the measurement component 1.

[0073] The cleaning component 3 includes a cleaning pipeline 3a. The cleaning pipeline 3a is communicated with the third port 51c. A third valve 5c is arranged on the cleaning pipeline 3a to conduct or cut off the cleaning pipeline 3a. Specifically, when the third valve 5c conducts the cleaning pipeline 3a, the cleaning pipeline 3a is communicated with the measuring component 1, and the cleaning liquid can flow to the measuring component 1 via the cleaning pipeline 3a and the commutation structure 51; when the third valve 5c cuts off the cleaning pipeline 3a, the cleaning pipeline 3a is not communicated with the measuring component 1, and the cleaning liquid cannot flow to the measuring component 1 via the cleaning pipeline 3a and the commutation structure 51.

[0074] One of the first valve 5a, the second valve 5b and the third valve 5c is located above the commutation structure 51, and the other two are respectively located on the opposite sides of the commutation structure 51 along the first direction, and the up-down direction is perpendicular to the first direction.

[0075] Exemplarily, please continue to refer to FIG. 2. The second valve 5b is located above the commutation structure 51, the first valve 5a is located on the first side of the commutation structure 51 along the first direction, and the third valve 5c is located on the second side of the commutation structure 51 along the first direction. In this way, on the one hand, more installation space is provided, which is convenient for arranging the gas supply pipeline 4, the exhaust pipeline 2a and the cleaning pipeline 3a, and prevents interference among the three. On the other hand, it prevents the distances between the first valve 5a, the second valve 5b and the third valve 5c from being too close, resulting in operation errors caused by confusion of operators. In addition, the operator can remotely control the first valve 5a, the second valve 5b and the third valve 5c through a manipulator. In this way, not only can the radiation generated by the spent fuel dissolution liquid be prevented from harming the operator, but also the layout mode of the first valve 5a, the second valve 5b, the third valve 5c and the commutation structure 51 provides a large movement space for the manipulator, which is convenient for the manipulator to operate.

[0076] The first direction can be the left-right direction or the front-back direction. The front refers to the side of the density measuring device 100 facing the operator when the operator uses the density measuring device 100, and the back is the direction opposite to the front. The left refers to the side where the left hand is located when the operator is on the front side of the density measuring device 100, and the right is the direction opposite to the left.

[0077] In some embodiments, please refer to Figure 1, the measuring assembly 1, the pumping and exhausting assembly 2, and the flow path switching assembly 5 are all arranged inside the hot cell 200. The hot cell 200 is filled with a drying gas, and the gas supply pipeline 4 is connected to the hot cell 200. The hot cell 200 is a shielded and enclosed facility for safely operating highly radioactive substances. That is to say, the measurement process of the spent fuel dissolution solution can be completed inside the hot cell 200. In this way, on the one hand, the hot cell 200 can shield at least part of the radiation generated by the spent fuel dissolution solution, further reducing the harm to the operating personnel. On the other hand, as an essential component of the gas environment inside the hot cell 200, the drying gas is connected to the hot cell 200 through the gas supply pipeline 4, eliminating the need to additionally set up devices for accommodating the drying gas, which not only simplifies the overall structure of the density measuring device 100 but also reduces costs.

[0078] It should be noted that the air pressure of the drying gas is greater than the air pressure inside the measuring assembly 1. In one embodiment, the air pressure of the drying gas is between 0.1 MPa and 0.2 MPa. Exemplarily, the air pressure of the drying gas can be 0.1 MPa, 0.12 MPa, 0.14 MPa, 0.16 MPa, 0.18 MPa, or 0.2 MPa. In this way, the air pressure of the drying gas is relatively high, so that it can smoothly flow into the measuring assembly 1 through the gas supply pipeline 4, preventing the residual liquid inside the measuring assembly 1 from flowing backward and contaminating other components of the density measuring device 100, such as the connecting pipeline 52, the commutation structure 51, etc.

[0079] In one embodiment, please refer to Figure 1 , part of the cleaning assembly 3 is arranged outside the hot cell 200. In this way, the operating personnel do not need to enter the hot cell 200 to replenish the cleaning liquid, which is convenient and fast, improving the operation safety. It can also prevent the radiation generated by the spent fuel dissolution solution from causing irradiation damage to the cleaning assembly 3 and extending the service life of the cleaning assembly 3.

[0080] In some embodiments, the material of the gas supply pipeline 4 is stainless steel. That is to say, the gas supply pipeline 4 is made of stainless steel. Stainless steel has good shielding performance and radiation resistance, which can prevent the radiation generated by the spent fuel dissolution solution from causing irradiation damage to the gas supply pipeline 4 and extending the service life of the gas supply pipeline 4.

[0081] In some embodiments, at least part of the material of the pumping and exhausting assembly 2 is stainless steel. For example, part of the pumping and exhausting assembly 2 can be made of stainless steel, or the entire pumping and exhausting assembly 2 can be made of stainless steel. In this way, it can prevent the radiation generated by the spent fuel dissolution solution from causing irradiation damage to the pumping and exhausting assembly 2 and extending the service life of the pumping and exhausting assembly 2. In one embodiment, the material of the pumping pipeline 2a is stainless steel.

[0082] In some embodiments, at least part of the material of the flow path switching component 5 is stainless steel. For example, part of the flow path switching component 5 can be made of stainless steel, or the entire flow path switching component 5 can be made of stainless steel. In this way, the radiation generated by the spent fuel dissolution solution can be reduced to cause irradiation damage to the flow path switching component 5, and the service life of the flow path switching component 5 can be extended.

[0083] In one embodiment, please refer to Figure 1 , at least part of the cleaning pipeline 3a is located in the hot cell 200, and the material of the cleaning pipeline 3a is stainless steel.

[0084] In some embodiments, please refer to Figure 3 and Figure 4 , the pumping and exhausting component 2 includes a bracket 21, a pumping and exhausting structure 22 and a pumping and exhausting pipeline 2a. The pumping and exhausting structure 22 includes a transmission rod 221, a piston head 222 and a pumping and exhausting bottle 223. The transmission rod 221 is connected to the piston head 222. The piston head 222 is arranged in the pumping and exhausting bottle 223. The pumping and exhausting bottle 223 is communicated with the pumping and exhausting pipeline 2a and is arranged on the bracket 21. The transmission rod 221 has a discharging position 221a and a sucking position 221b. The discharging position 221a is located above the pumping and exhausting bottle 223, and the sucking position 221b is located above the discharging position 221a. The transmission rod 221 can move back and forth between the discharging position 221a and the sucking position 221b to drive the piston head 222 to move back and forth in the pumping and exhausting bottle 223 in the up and down direction.

[0085] The discharging position 221a is the position where the transmission rod 221 drives the piston head 222 to move to drain the spent fuel dissolution solution in the measuring component 1 completely. The sucking position 221b is the position where the transmission rod 221 drives the piston head 222 to move to suck the spent fuel dissolution solution into the measuring component 1.

[0086] Please refer to Figure 3 and Figure 4 , the pumping and exhausting bottle 223 is arranged on the bracket 21. The bracket 21 plays a role in fixing the pumping and exhausting bottle 223 to ensure the stability of the pumping and exhausting bottle 223 during operation. The discharging position 221a and the sucking position 221b are spaced apart in the up and down direction. That is to say, the transmission rod 221 can move back and forth in the up and down direction, so as to drive the piston head 222 to move back and forth in the up and down direction. The structure is simple and convenient to operate.

[0087] Exemplarily, the piston head 222 defines a partial space within the pumping and discharging bottle 223 as a pumping and discharging chamber. The pumping and discharging chamber communicates with the pumping and discharging pipeline 2a. The piston head 222 is slidably engaged with the pumping and discharging bottle 223 in the vertical direction. In this way, when the piston head 222 moves downward, the volume of the pumping and discharging chamber gradually decreases, and the pressure within the pumping and discharging chamber gradually increases, so as to discharge the spent fuel dissolution liquid from within the measuring assembly 1. When the piston head 222 moves upward, the volume of the pumping and discharging chamber gradually increases, and the pressure within the pumping and discharging chamber gradually decreases and forms a negative pressure zone. Thus, the spent fuel dissolution liquid can be pumped into the measuring assembly 1.

[0088] In one embodiment, the pumping and discharging bottle 223 is made of a transparent material. In this way, it is convenient to observe the piston head 222 within the pumping and discharging bottle 223. Exemplarily, the transparent material can be glass.

[0089] In one embodiment, the pumping and discharging structure 22 includes a protective shell that wraps at least a portion of the outer surface of the pumping and discharging bottle 223. The protective shell protects the pumping and discharging bottle 223 and prevents it from being damaged due to collision with other components. Exemplarily, the protective shell is made of stainless steel. Thus, it can prevent the radiation generated by the spent fuel dissolution liquid from causing irradiation damage to the pumping and discharging bottle 223 and the piston head 222, and extend the service life.

[0090] In one embodiment, please refer to Figure 5 , the pumping and discharging assembly 2 includes a fixing member 23, and the fixing member 23 connects the transmission rod 221 and the piston head 222. Please continue to refer to Figure 5 , the fixing member 23 includes a fixing shell 231, a fixing head 232, and a connecting rod 233. The fixing shell 231 connects to the lower end of the transmission rod 221. The fixing shell 231 forms a fixing cavity 231a, and the fixing cavity 231a has an inlet and outlet 231b that opens in the horizontal direction. The lower end of the connecting rod 233 connects to the piston head 222, and the upper end of the connecting rod 233 connects to the fixing head 232. The fixing head 232 enters and exits the fixing cavity 231a through the inlet and outlet 231b, facilitating the assembly of the transmission rod 221 and the piston head 222. When the fixing head 232 is located within the fixing cavity 231a, the fixing head 232 abuts against the wall surface of the fixing cavity 231a, and the peripheral side wall of the connecting rod 233 is clamped to the side wall of the inlet and outlet 231b. In this way, the connection stability between the transmission rod 221 and the piston head 222 can be enhanced.

[0091] In one embodiment, please refer to Figure 3 and Figure 4 , an operating handle 2212 is provided at one end of the transmission rod 221 that is away from the piston head 222 in the vertical direction. The operating handle 2212 provides a gripping space. Thus, an operator can control the robotic hand to grip the operating handle 2212 to drive the transmission rod 221 to move back and forth in the vertical direction.

[0092] In one embodiment, please refer to Figure 5, the pumping and exhausting assembly 2 includes a clamping member 24 which is arranged on the bracket 21 and clamps the circumferential side wall of the pumping and exhausting bottle 223. In this way, the stability of the pumping and exhausting bottle 223 can be further improved.

[0093] In some embodiments, please refer to Figure 3 and Figure 4 , the pumping and exhausting structure 22 includes a limiting flap 224 and a limiting platform 225. The limiting flap 224 is arranged on the bracket 21 and is located above the pumping and exhausting bottle 223. The transmission rod 221 passes through the limiting flap 224. The limiting platform 225 is connected to the circumferential side wall of the transmission rod 221 and is located above the limiting flap 224. The limiting platform 225 is used to abut against the limiting flap 224 to limit the transmission rod 221 at the discharging position 221a.

[0094] The limiting flap 224 is arranged on the bracket 21, and the bracket 21 plays a role in fixing the limiting flap 224 to ensure the stability of the limiting flap 224 during operation.

[0095] When the transmission rod 221 is at the discharging position 221a, the limiting platform 225 abuts against the limiting flap 224. Through the cooperation of the limiting platform 225 and the limiting flap 224, the movement of the transmission rod 221 in the up and down direction can be restricted. In this way, the transmission rod 221 can spontaneously remain at the discharging position 221a.

[0096] In some embodiments, please refer to Figure 3 and Figure 6 , the bracket 21 is formed with a positioning hole 21a and a stop platform 21b. The transmission rod 221 passes through the positioning hole 21a. The stop platform 21b protrudes from the circumferential side wall of the positioning hole 21a. The pumping and exhausting structure 22 includes a stop strip 226 connected to the circumferential side wall of the transmission rod 221. The transmission rod 221 rotates to enable the stop strip 226 to avoid or abut against the stop platform 21b. When the stop strip 226 avoids the stop platform 21b, the transmission rod 221 can move back and forth between the discharging position 221a and the pumping position 221b. When the stop strip 226 abuts against the stop platform 21b, the transmission rod 221 is restricted at the pumping position 221b. Specifically, with a plane perpendicular to the up and down direction as the projection plane, when the stop strip 226 avoids the stop platform 21b, the projections of the stop strip 226 and the stop platform 21b do not overlap. When the stop strip 226 abuts against the stop platform 21b, at least part of the projection of the stop strip 226 is within the projection range of the stop platform 21b.

[0097] For example, when the position of the transmission rod 221 does not need to be restricted, the stop bar 226 avoids the stop platform 21b, allowing the transmission rod 221 to smoothly move back and forth between the discharge position 221a and the suction position 221b. When the position of the transmission rod 221 needs to be restricted, when the transmission rod 221 is in the suction position 221b, the transmission rod 221 is rotated so that the stop bar 226 abuts the stop platform 21b, thereby restricting the transmission rod 221 to the suction position 221b. This is convenient and quick. In this way, through the cooperation of the stop bar 226 and the stop platform 21b, the transmission rod 221 can spontaneously maintain the suction position 221b.

[0098] For some examples, see Figure 3 and Figure 7 The peripheral side wall of the transmission rod 221 is provided with a flange 2211, and the limiting block piece 224 is slidably provided on the bracket 21 along the first direction. The limiting block piece 224 is formed with an avoidance hole 224a and a stop hole 224b that are interconnected. The transmission rod 221 is passed through the avoidance hole 224a and can slide between the avoidance hole 224a and the stop hole 224b. The limiting block piece 224 has an avoidance position and a stop position in the first direction; when the limiting block piece 224 is in the avoidance position, the flange 2211 can pass through the avoidance hole 224a, and when the limiting block piece 224 is in the stop position, the flange 2211 abuts against the surrounding part of the stop hole 224b.

[0099] The avoidance position refers to the position where the flange 2211 can pass through the avoidance hole 224a, allowing the transmission rod 221 to move in the vertical direction. The stop position refers to the position where the flange 2211 cannot pass through the stop hole 224b, thereby limiting the upward movement of the transmission rod 221. Specifically, taking a plane perpendicular to the vertical direction as the projection surface, when the limit stopper 224 is in the avoidance position, the projection of the flange 2211 is within the projection range of the avoidance hole 224a. When the limit stopper 224 is in the stop position, at least a portion of the projection of the stop hole 224b is within the projection range of the flange 2211.

[0100] Please continue reading Figure 3The stopper 224 is located between the discharge position 221a and the suction position 221b, with the flange 2211 abutting against the area surrounding the stop hole 224b. In other words, the stopper 224 can constrain the transmission rod 221 between the discharge position 221a and the suction position 221b. Thus, when the transmission rod 221 moves upward from the discharge position 221a to the suction position 221b, the stopper 224 is in the avoidance position, allowing the extraction assembly 2 to draw the spent fuel solution into the measurement assembly 1. After the measurement is completed, when the transmission rod 221 moves downward from the suction position 221b to the discharge position 221a, the stopper 224 can be in the stop position, thereby discharging a predetermined volume of spent fuel solution and achieving quantitative sampling for collection by operators and further research.

[0101] In one embodiment, please refer to Figure 7 The stopping hole 224b is located on one side of the avoiding hole 224a along the first direction.

[0102] For some examples, see Figure 3 、 Figure 4 and Figure 7 The pumping structure 22 includes a limiting rod 227 connected to the transmission rod 221, and the limiting block 224 has a first limiting hole 224c and a second limiting hole 224d arranged at intervals along the first direction. When the limiting block 224 is in the avoidance position, the limiting rod 227 is passed through the first limiting hole 224c. When the limiting block 224 is in the stop position, the limiting rod 227 is passed through the second limiting hole 224d.

[0103] It is understandable that the limiting block piece 224 is first adjusted to the avoidance position or the stopping position, and then the limiting rod 227 is passed through the first limiting hole 224c or the second limiting hole 224d.

[0104] The first and second limiting holes 224c, 224d cooperate with the limiting rod 227 to constrain the limiting plate 224 to either the avoidance position or the stop position. The limiting rod 227 is connected to the transmission rod 221, allowing both the limiting rod 227 and the transmission rod 221 to move vertically simultaneously. Alternatively, the transmission rod 221 can be constrained between the discharge position 221a and the suction position 221b by the flange 2211. During this process, the transmission rod 221, the limiting rod 227, and the limiting plate 224 maintain good stability, ensuring operational reliability.

[0105] See also Figure 7 The first limiting hole 224c and the second limiting hole 224d are spaced apart along the first direction. In this way, when the limiting block 224 switches between the avoidance position and the stop position, it is convenient for the limiting rod 227 to pass through the first limiting hole 224c, or the limiting rod 227 to pass through the second limiting hole 224d, which is convenient and quick.

[0106] In some embodiments, please refer to Figure 3 and Figure 4 , there are multiple limiting stop pieces 224, and the multiple limiting stop pieces 224 are arranged at intervals in the up and down direction. That is to say, the multiple limiting stop pieces 224 have multiple stop positions in the up and down direction. In this way, during the process of the transmission rod 221 moving downward from the suction position 221b to the discharge position 221a, it can be restricted at any one of the stop positions as required, that is, the measuring assembly 1 discharges spent fuel dissolution liquid of different volumes, realizing quantitative sampling for the operator to collect and conduct other research.

[0107] In one embodiment, the multiple limiting stop pieces 224 are evenly spaced in the up and down direction. That is to say, the distance between any two adjacent stop positions is the same. In this way, during the process of the transmission rod 221 moving downward from the suction position 221b to the discharge position 221a, the transmission rod 221 can be successively restricted at any one of the stop positions. In this way, the volume of the spent fuel dissolution liquid discharged from the measuring assembly 1 each time is the same, and the operator can obtain the spent fuel dissolution liquid of the same volume in batches.

[0108] Exemplarily, please refer to Figure 3 and Figure 4 , there are five limiting stop pieces 224, and the five limiting stop pieces 224 are evenly distributed in the up and down direction. The limiting stop piece 224 located at the highest position is defined as the high-position limiting stop piece. It can be understood that when the transmission rod 221 is located at the suction position 221b, the lower surface of the flange 2211 is flush with the upper surface of the high-position limiting stop piece, and the other four limiting stop pieces 224 have four stop positions.

[0109] During the process of the transmission rod 221 moving upward from the discharge position 221a to the suction position 221b, the pumping and discharging assembly 2 can pump 5 mL of spent fuel dissolution liquid into the measuring assembly 1. After the measurement is completed, the transmission rod 221 is successively restricted at the four stop positions, that is, the flange 2211 successively abuts against the peripheral parts of the stop holes 224b of the four limiting stop pieces 224. In this way, 1 mL of spent fuel dissolution liquid is discharged from the measuring assembly 1 each time. When the transmission rod 221 is restricted at the lowermost stop position, a total of 4 mL of spent fuel dissolution liquid is discharged. Further, the transmission rod 221 is reset downward from the lowermost stop position to the discharge position 221a, and the last 1 mL of spent fuel dissolution liquid in the measuring assembly 1 is discharged. When the transmission rod 221 is located at the discharge position 221a, the limiting platform 225 abuts against the high-position limiting stop piece.

[0110] It should be noted that during the process of the transmission rod 221 moving downward from the suction position 221b to the discharge position 221a, the present application does not limit the distance of a single displacement of the transmission rod 221, that is, it does not limit the volume of the spent fuel dissolution liquid discharged from the measurement assembly 1 each time. Exemplarily, the spent fuel dissolution liquid discharged from the measurement assembly 1 each time can be 2 mL, 3 mL, or 4 mL.

[0111] In some embodiments, please refer to Figure 3 and Figure 4 , among the remaining limiting flappers 224 located below the highest limiting flapper 224, a handle 2241 is provided, and adjacent two handles 2241 are respectively located on opposite sides in the first direction. The handle 2241 provides a gripping space. In this way, the operator can control the robotic hand to grip the handle 2241 to drive the limiting flapper 224 to move back and forth in the first direction.

[0112] Exemplarily, please refer to Figure 3 , among the remaining limiting flappers 224 located below the highest limiting flapper 224, there are four limiting flappers 224, and the four limiting flappers 224 are, from top to bottom, the first limiting flapper, the second limiting flapper, the third limiting flapper, and the fourth limiting flapper. Among them, the handles 2241 of the first limiting flapper and the third limiting flapper are on the first side in the first direction, and the handles 2241 of the second limiting flapper and the fourth limiting flapper are on the second side in the first direction. In this way, the handles 2241 arranged staggeredly can not only prevent interference between adjacent handles 2241, but also provide a larger movement space for the robotic hand to prevent the robotic hand from accidentally touching other handles 2241 during the operation.

[0113] The first side in the first direction and the second side in the first direction are two opposite directions.

[0114] In one embodiment, the first direction is parallel to the horizontal plane. That is to say, the limiting flapper 224 moves substantially along the horizontal direction. In this way, the movement process of the limiting flapper 224 is relatively stable, and the operation stability can be improved.

[0115] In some embodiments, please refer to Figure 1 , the density measurement device 100 includes a processor 6, and the processor 6 is used to collect and process the density data of the spent fuel dissolution liquid. Exemplarily, the processor 6 can perform real-time processing or offline processing on the density data.

[0116] There is no specific limitation on the processor 6. For example, it can be a mobile terminal or a personal computer, etc.

[0117] Table 1 shows the relevant data obtained by measuring the density standard solution using the density measurement device 100 provided in the application embodiment. Among them, the temperature in the hot chamber 200 is 20 °C. The density standard solution is a liquid with a known accurate density, which is used to calibrate the density measurement device 100 to ensure the accuracy and traceability of the measurement results.

[0118] It can be seen that the RSD of the six density measurements is 0.0027%, and the deviation is -0.00082, indicating that the measurement accuracy of the density measurement device 100 provided in the application embodiment is relatively good. Among them, RSD is the relative standard deviation.

[0119] Table 1

[0120]

[0121] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments" and "exemplarily" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0122] The various embodiments / embodiment modes provided in this application can be combined with each other without conflict. The above are only the preferred embodiments of this application, and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A density measurement device for spent fuel dissolution solution, characterized in that, Comprising: A measurement component for measuring the density of the spent fuel dissolution solution; A pumping and discharging component for pumping the spent fuel dissolution solution into and out of the measurement component; A cleaning component for providing a cleaning liquid; An air supply pipeline for providing a drying gas; A flow path switching component, including a commutation structure communicated with the measurement component, the commutation structure having a first port, a second port and a third port, the first port being communicated with the air supply pipeline, the second port being communicated with the pumping and discharging component, the third port being communicated with the cleaning component, and the commutation structure being capable of conducting the flow path between any one of the first port, the second port and the third port and the measurement component.

2. The density measurement device according to claim 1, wherein, The flow path switching component includes a first valve, a second valve and a third valve, the first valve being arranged on the air supply pipeline to conduct or cut off the air supply pipeline; The pumping and discharging component includes a pumping and discharging pipeline, the pumping and discharging pipeline being communicated with the second port, the second valve being arranged on the pumping and discharging pipeline to conduct or cut off the pumping and discharging pipeline; The cleaning component includes a cleaning pipeline, the cleaning pipeline being communicated with the third port, the third valve being arranged on the cleaning pipeline to conduct or cut off the cleaning pipeline; One of the first valve, the second valve and the third valve is located above the commutation structure, and the other two are respectively located on opposite sides of the commutation structure along a first direction, the up-down direction and the first direction being perpendicular.

3. The density measurement device according to claim 1, characterized in that, The measurement component, the pumping and discharging component and the flow path switching component are all arranged in a hot cell, the hot cell being filled with the drying gas, and the air supply pipeline being communicated with the hot cell.

4. The density measurement device according to claim 1, characterized in that The material of the air supply pipeline is stainless steel.

5. The density measurement device according to claim 1, characterized in that At least part of the material of the pumping and discharging component is stainless steel; and / or, At least part of the material of the flow path switching component is stainless steel.

6. The density measurement device according to claim 1, wherein, The pumping and discharging component includes a bracket, a pumping and discharging structure and a pumping and discharging pipeline, the pumping and discharging structure including a transmission rod, a piston head and a pumping and discharging bottle, the transmission rod connecting the piston head, the piston head being arranged in the pumping and discharging bottle, the pumping and discharging bottle being communicated with the pumping and discharging pipeline and being arranged on the bracket, the transmission rod having a discharging position and a suction position, the discharging position being located above the pumping and discharging bottle, the suction position being located above the discharging position, and the transmission rod being capable of reciprocating between the discharging position and the suction position to drive the piston head to reciprocate up and down in the pumping and discharging bottle.

7. The density measuring device according to claim 6, characterized in that, The pumping and discharging structure includes a limit retaining piece and a limit platform, the limit retaining piece being arranged on the bracket and located above the pumping and discharging bottle, the transmission rod passing through the limit retaining piece, and the limit platform being connected to the peripheral side wall of the transmission rod and located above the limit retaining piece; The limit platform is used for abutting against the limit retaining piece to limit the transmission rod at the discharging position.

8. The density measurement device according to claim 7, characterized in that, The bracket is formed with a positioning hole and a stop platform, the transmission rod passing through the positioning hole, the stop platform protruding from the peripheral side wall of the positioning hole, and the pumping and discharging structure including a stop strip connecting the peripheral side wall of the transmission rod, the transmission rod rotating to enable the stop strip to avoid or abut against the stop platform; When the stop bar avoids the stop platform, the transmission rod can move back and forth between the discharge position and the suction position; when the stop bar abuts against the stop platform, the transmission rod is restricted to the suction position.

9. The density measuring device according to claim 6, characterized in that, The pumping structure includes a limit block piece located above the pumping bottle, a flange is provided on the peripheral side wall of the transmission rod, the limit block piece is slidably provided on the bracket along a first direction, the limit block piece is formed with a mutually communicating avoidance hole and a stop hole, the transmission rod is passed through the avoidance hole and can slide between the avoidance hole and the stop hole, and the limit block piece has a avoidance position and a stop position in the first direction; When the limit block is located at the avoidance position, the flange can pass through the avoidance hole. When the limit block is located at the stop position, the flange abuts against the surrounding area of the stop hole, and the first direction is perpendicular to the up and down direction.

10. The density measurement device according to claim 9, characterized in that, The pumping structure includes a limiting rod connected to the transmission rod, and the limiting block has a first limiting hole and a second limiting hole arranged at intervals along a first direction. When the limiting block is located in the avoidance position, the limiting rod is passed through the first limiting hole. When the limiting block is located in the stop position, the limiting rod is passed through the second limiting hole.

11. The density measurement device according to claim 9, characterized in that, There are a plurality of the limit blocks, which are spaced apart in the up-down direction.

12. The density measurement device according to claim 11, wherein The remaining limit blocking pieces located below the highest limit blocking piece are provided with handles, and two adjacent handles are respectively located on opposite sides of the first direction.

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