Concentration control facility and concentration control method

Abstract

To allow a slurry containing radioactive substances to be supplied to a downstream side at a stable concentration.SOLUTION: A concentration control facility is provided, comprising a tank for storing a slurry obtained by mixing a radioactive waste resin and water, first piping for supplying the slurry to the tank, a concentration meter for measuring rein concentration of the slurry in the first piping, and a concentration adjustment mechanism for adjusting the resin concentration in the tank on the basis of measurement results of the concentration meter.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a concentration control facility and a concentration control method. [Background technology]

[0002] At nuclear power plants and other nuclear facilities, radioactive waste containing radioactive materials is generated. The radioactive waste is treated in a state in which the radioactive materials do not affect the surroundings. For example, Patent Document 1 describes a method in which sludge-like radioactive waste is stirred to form a slurry, the radioactivity concentration in the slurry is measured, and the amount of water or the amount of slurry is adjusted based on the measured value to produce a uniform cement solidified body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 2799074 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology of Patent Document 1, the amount of water or the amount of slurry is adjusted based on the measured value of the radioactivity concentration. Therefore, the concentration of sludge contained in the slurry may not be stable. Also, when mixing radioactive materials other than sludge with water to make a slurry and treat it, if the concentration of the liquid to be treated fluctuates, it may not be possible to treat it uniformly in the post-treatment.

[0005] The present disclosure has been made in consideration of the above, and aims to provide a concentration control equipment and a concentration control method that supply a slurry containing a radioactive substance to a downstream side at a stable concentration. [Means for solving the problem]

[0006] The concentration control equipment of the present disclosure includes a tank for storing a slurry in which resin, which is radioactive waste, is mixed with water, a first pipeline for supplying the slurry to the tank, a concentration meter for measuring the resin concentration of the slurry in the first pipeline, and a concentration adjustment mechanism for adjusting the resin concentration in the tank based on the measurement results of the concentration meter.

[0007] The concentration management method according to the present disclosure includes the steps of supplying a slurry in which resin, which is radioactive waste, is mixed with water to a tank, measuring the resin concentration of the slurry to be supplied to the tank, and adjusting the resin concentration in the tank based on the measurement results of the resin concentration. Effect of the Invention

[0008] According to the present disclosure, a slurry containing a radioactive substance can be supplied to the downstream side at a stable concentration. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of a concentration control facility according to an embodiment. [Diagram 2] FIG. 2 is a flowchart showing an example of a concentration management method of the concentration management facility according to the embodiment. [Diagram 3] FIG. 3 is a flowchart showing an example of a process in the tank according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A preferred embodiment of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to this embodiment, and when there are multiple embodiments, it also includes a configuration formed by combining the respective embodiments. In addition, the components in the embodiments include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components in the embodiments described below can be omitted, replaced, or modified in various ways without departing from the gist of the present invention.

[0011] 1 is a schematic diagram of a concentration control facility according to an embodiment. The concentration control facility 11 is provided in a nuclear facility 100, for example.

[0012] <Nuclear equipment> Here, an overview of the nuclear power facility 100 will be described. The nuclear power facility 100 has, for example, a pressurized water reactor (PWR). The nuclear power facility 100 generates, for example, electricity using heat generated in the pressurized reactor. The nuclear power facility 100 uses light water as a reactor coolant and a neutron moderator, and converts it into high-temperature, high-pressure water that does not boil throughout the entire core of the reactor. This high-temperature, high-pressure water (primary coolant) is sent to a steam generator, where steam is generated by heat exchange. This steam (secondary coolant) is then sent to a turbine generator to generate electricity. Here, the secondary coolant is turned into steam by the heat of the high-temperature, high-pressure primary coolant from the reactor in the steam generator, drives a steam turbine, and is then cooled by seawater in a condenser to become condensed water, which is then returned to the steam generator by a condensate pump. The nuclear power facility 100 may be a nuclear power facility using a boiling water reactor (BWR).

[0013] <Resin treatment equipment> The resin treatment facility 10 treats resin that has been used in the nuclear power facility 100 and has become radioactive waste. The resin (used resin) that becomes radioactive waste is, for example, an ion exchange membrane disposed in a low-conductivity waste liquid system and a high-conductivity waste liquid system. The resin that becomes radioactive waste is large enough to be slurried in water. The used resin is an ion exchange resin that was installed in a desalting tower that performs desalting treatment and is provided in the low-conductivity waste liquid system and the high-conductivity waste liquid system. More specifically, the used resin is an ion exchange resin that has adsorbed impurities in the waste liquid flowing through the desalting tower provided in these waste liquid systems. The used resin is a substance that does not dissolve in water. The size of one particle of the used resin is 0.4 mm or more and less than 1.2 mm, and the specific gravity is 1.1 to 1.2. The concentration refers to the volume concentration of the used resin relative to the water. Note that the target resin is not limited to this. The resin treatment facility 10 transports resin together with water from a resin discharge pipe 101 of the nuclear power facility 100. An on-off valve 14 is provided in the resin discharge pipeline 101. The on-off valve 14 opens and closes in response to a signal sent from the control unit 40, and switches between on and off the supply of slurried resin and water from the nuclear facility 100 to the resin treatment facility 10.

[0014] Resin treatment equipment 10 includes storage tank 12, first pipeline 15, first pump P1, concentration meter 17, tank 18, second pipeline 20, dehydrator 22, and control unit 40. Of the resin treatment equipment 10, first pipeline 15, first pump P1, concentration meter 17, tank 18, second pipeline 20, and control unit 40 constitute concentration control equipment 11. In addition, in concentration control equipment 11, a mechanism for supplying slurry to tank 18 constitutes a part of a concentration adjustment mechanism.

[0015] The storage tank 12 is a tank that stores slurry (a mixture of resin and water) supplied from the nuclear facility 100. The storage tank 12 is connected to a resin discharge pipeline 101 and a first pipeline 15. The storage tank 12 stores the slurry supplied from the resin discharge pipeline 101. The storage tank 12 discharges the stored slurry to the first pipeline 15.

[0016] The first pipeline 15 is a pipeline connected at one end to the storage tank 12 and at the other end to the tank 18. It is preferable that the end of the first pipeline 15 connected to the tank 18 penetrates the tank 18 and opens vertically downward (to the bottom surface of the tank 18). The first pipeline 15 is provided with an on-off valve 16, a concentration meter 17, and a first pump P1. The first pump P1 transports the slurry from the storage tank 12 to the tank 18. The on-off valve 16 switches between opening and closing the first pipeline 15. The resin treatment equipment 10 transports the slurry from the storage tank 12 to the tank 18 by opening the on-off valve 16 and operating the first pump P1. The resin treatment equipment 10 transports the slurry from the storage tank 12 to the tank 18 at a rate of, for example, 5 m per hour from the storage tank 12 to the tank 18. 3 The slurry is transported at a flow rate of

[0017] In this embodiment, the concentration meter 17 is provided closer to the tank 18 than the first pump P1. The concentration meter 17 is a resin concentration meter that measures the resin concentration of the slurry flowing through the first pipe 15. The concentration meter 17 measures the volume concentration of the used resin contained in the slurry by the flow of the slurry. The concentration meter 17 can also be said to be a flow meter that measures the flow rate of the used resin. For example, the concentration meter 17 is preferably an ultrasonic concentration meter. The concentration meter 17 oscillates ultrasonic waves to the slurry flowing through the concentration meter 17. When the ultrasonic waves oscillated from the concentration meter 17 come into contact with the used resin contained in the slurry, the frequency changes and the ultrasonic waves are reflected. The concentration meter 17 measures the concentration of the used resin contained in the slurry from the change in frequency of the ultrasonic waves that come into contact with the used resin contained in the slurry. The concentration meter 17 measures the concentration (resin concentration) of the used resin contained in the slurry by the frequency shift (Doppler effect) of the ultrasonic waves oscillated by the concentration meter 17 with respect to the used resin contained in the slurry. The predetermined concentration is, for example, 10 vol% of the amount of used resin relative to the volume of water. The concentration meter 17 can calculate the resin concentration in the slurry supplied to the tank 18 by integrating the calculation results of the resin concentration of the slurry flowing through the concentration meter 17.

[0018] The tank 18 stores the slurry supplied from the first pipeline 15. The tank 18 includes a tank body 181, an agitator 19, a filter 25, a level gauge 30, and a water level gauge 31. The tank body 181 stores the slurry supplied from the first pipeline 15. The tank body 181 has, for example, a truncated cone shape (conical shape), and the bottom surface of the tank body 181 is narrower than the top surface. The bottom surface of the tank body 181 is closed, and the shaft 191 of the agitator 19 penetrates the top surface. The tank body 181 is connected to the first pipeline 15 and the second pipeline 20. The pure water pipeline 29 is connected to the tank body 181 and supplies pure water to the tank body 181. Furthermore, the tank body 181 is connected to a drainage pipeline 26. A drain pipe for draining the remaining used resin and foreign matter that does not flow may be connected to the tank body 181. The used resin also flows through the drain pipe when the amount of used resin stored in the tank 18 is too large for the dehydrator 22 described below to process. The shape of the tank 18 is not limited to this.

[0019] The concentration control equipment 11 adjusts the resin concentration of the slurry in the tank body 181. Specifically, the concentration control equipment 11 adjusts the amount of slurry supplied from the first pipeline 15 to the tank body 181 of the tank 18 and the amount of water discharged from the tank 18 to set the resin concentration of the slurry discharged from the tank 18 to a predetermined range. The concentration control equipment 11 adjusts the concentration of the used resin contained in the slurry to 10 vol% relative to the volume of the water downstream of the tank 18. The concentration control equipment 11 adjusts the concentration of the used resin in the tank 18 to 10 vol% relative to the capacity of the tank 18, and then discharges the adjusted slurry downstream. The tank 18 supplies the slurry to a dehydrator 22 via a second pipeline 20.

[0020] The agitator 19 agitates the used resin contained in the slurry stored in the tank 18. The agitator 19 is preferably capable of agitating the used resin that has settled to the bottom surface of the tank 18. In this embodiment, the agitator 19 is provided from the upper surface of the tank 18 toward the bottom surface of the tank 18. The agitator 19 has a shaft 191 and an agitator blade 192. The agitator 19 rotates the agitator blade 192 in the circumferential direction of the tank 18 by rotating the agitator blade 192. The agitator 19 generates a swirling flow in the tank 18 by rotating the agitator blade 192, agitating the used resin and water, and averaging the dispersion of the used resin in the tank 18.

[0021] The pure water tank 28 is a tank for storing pure water for diluting the concentration of used resin. The pure water tank 28 is connected to the tank 18 via a pure water pipe 29. The concentration control equipment 11 can lower the resin concentration in the tank 18 by supplying pure water from the pure water tank 28 to the tank 18.

[0022] The level meter 30 is a resin level meter that measures the concentration of the slurry (used resin) in the tank 18. The level meter 30 measures the position of the top surface of the used resin accumulated in the tank 18, calculates the amount of used resin in the tank 18, and measures the resin concentration of the slurry in the tank 18 from the calculation result. The level meter 30 is, for example, an ultrasonic distance meter. In this case, the level meter 30 oscillates ultrasonic waves into the tank 18, detects reflections at the interface of the used resin, and measures the height of the interface of the used resin in the tank 18. The concentration management equipment 11 measures the concentration from the height of the interface of the used resin in the tank 18 with the level meter 30 after a time (for example, about 10 minutes) has elapsed since the used resin settled in the tank 18 until the interface is formed. Note that the amount of used resin corresponding to the height of the interface can be calculated by measuring it in advance through an experiment or the like.

[0023] The water level gauge 31 measures the water level in the tank 18. The water level gauge 31 is, for example, an ultrasonic water level gauge. The water level gauge 31 oscillates ultrasonic waves toward the water surface of the slurry stored in the tank 18, and measures the height of the water surface of the slurry stored in the tank 18 by the reflection of the ultrasonic waves. Note that the water level gauge 31 is not limited to an ultrasonic water level gauge as long as it can measure the water level in the tank 18.

[0024] The concentration control equipment 11 of this embodiment has a filter 25, a drainage pipeline 26, an on-off valve 27, and a drainage pump P3 as a concentration adjustment mechanism. The filter 25 is disposed on the upstream side of the drainage pipeline 26 (at the connection with the tank 18). The filter 25 is provided on the side of the tank 18. The filter 25 is a member that allows the water of the slurry in the tank 18 to pass through but does not allow the used resin to pass through. The filter 25 is a membrane that allows water to pass through or a porous body that collects resin. The filter 25 is, for example, a Johnson screen.

[0025] One end of the drainage pipeline 26 is connected to the side of the tank 18, and the other end is connected to a pipeline of the drainage system of the nuclear facility 100. The end of the drainage pipeline 26 on the tank 18 side is connected to the filter 25. Water from the tank 18 that has passed through the filter 25 flows into the drainage pipeline 26. An on-off valve 27 is provided in the drainage pipeline 26 and switches the drainage pipeline 26 between open and closed states. A drainage pump P3 is provided in the drainage pipeline 26 and creates a flow that causes the water in the tank 18 to flow into the drainage pipeline 26.

[0026] The second pipeline 20 is a pipeline having one end connected to a side surface of the tank 18 and the other end connected to a dehydrator 22. The end of the second pipeline 20 connected to the tank 18 passes through the side surface of the tank 18 and faces downward (towards the bottom surface of the tank 18). The second pipeline 20 allows slurry from the tank 18 to flow. The resin processing equipment 10 can, for example, transport slurry from the tank 18 to the dehydrator 22 at a rate of 1 m per hour. 3 The second pipeline 20 is provided with an on-off valve 21 and a second pump P2. The on-off valve 21 switches between opening and closing the second pipeline 20. The second pump P2 forms a flow that sends the slurry in the tank 18 to the dehydrator 22.

[0027] The dehydrator 22 is connected to the tank 18 via the second pipeline 20. A dehydration pipeline 23 is connected to the dehydrator 22. The dehydrator 22 separates the water and the resin contained in the slurry. The dehydrator 22 may perform dehydration by any method. The dehydrator 22 may perform dehydration by, for example, separating the water and the used resin by centrifugal force. The dehydrator 22 may also be a filter that passes water but does not pass resin, or may flow only water through the filter to the dehydration pipeline 23. It is preferable that the dehydrator 22 perform dehydration until the slurry stored in the tank 18 is empty, but this is not limited thereto. The dehydrator 22 performs dehydration depending on, for example, the size of the tank 18. For example, the dehydrator 22 may perform dehydration for each day if the tank 18 is capable of storing a week's worth of slurry. In the resin treatment facility 10, the used resin from which water has been separated in the dehydrator 22 is placed in a drum together with cement, where it is solidified and buried, or incinerated and treated as incineration ash.

[0028] One end of the dehydration pipeline 23 is connected to the dehydrator 22. Water separated by the dehydrator 22 flows through the dehydration pipeline 23. The other end of the dehydration pipeline 23 may be connected to a pipeline that discharges another wastewater. The water flowing through the dehydration pipeline 23 is subjected to a process for removing radioactive materials, for example, a heating process, and reduced in volume.

[0029] The control unit 40 is a computing device equipped with a CPU (Central Processing Unit) and a storage device. The control unit 40 performs each judgment of the resin treatment equipment 10 and the concentration management equipment 11, and controls each function. The control unit 40 is connected to the dehydrator 22, the concentration meter 17, the level meter 30, the water level meter 31, the on-off valves 14, 16, 21, 27, the first pump P1, the second pump P2, the drainage pump P3, and the agitator 19, and controls the operation of each part. The control unit 40 controls the opening and closing of each on-off valve and the operation of each pump based on the measured values ​​of the concentration meter 17 and the level meter 30, and controls the flow rate of the slurry. The control unit 40 also judges the concentration of the used resin relative to a predetermined concentration in the tank 18 from the measured values ​​of the concentration meter 17.

[0030] <Concentration control method> The concentration control equipment 11 controls the concentration of the slurry (used resin) stored in the tank 18 to a predetermined concentration by adjusting the concentration of the slurry (used resin) stored in the tank 18. In this way, it is possible to stably supply the concentration of the slurry (used resin) to the downstream side (dehydrator 22). The concentration control method of the concentration control equipment 11 will be described below. The concentration control method of the concentration control equipment 11 can be executed by processing the operation of each part in the control unit 40. Note that some of the controls may be executed by an operator or worker.

[0031] 2 is a flowchart showing an example of a concentration control method of the concentration control equipment according to the embodiment. The control unit 40 stores the slurry in the storage tank 12 (step S10). When the control unit 40 determines to treat the resin, it supplies the slurry in the storage tank 12 to the tank 18 (step S12).

[0032] The control unit 40 measures the concentration of the slurry (step S14). Specifically, the control unit 40 measures the concentration of the used resin contained in the slurry flowing through the first pipeline 15 with the concentration meter 17.

[0033] The control unit 40 stores the slurry supplied from the storage tank 12 in the tank 18 (step S16). The control unit 40 executes the processes of steps S12, S14, and S16 in parallel.

[0034] The control unit 40 stops the first pump P1 (step S18) after supplying a predetermined amount of slurry to the tank 18. That is, the control unit 40 stops the supply of slurry from the storage tank 12 to the tank 18 after supplying a predetermined amount of slurry to the tank 18.

[0035] After stopping the first pump P1, the control unit 40 executes a concentration adjustment process (step S20). An example of the concentration adjustment process will be described. Fig. 3 is a flow chart showing an example of the process in the tank according to the embodiment.

[0036] The control unit 40 determines whether the concentration of the used resin contained in the slurry in the tank 18 is higher than a predetermined concentration range (step S30). The control unit 40 determines whether the resin concentration in the tank 18 is higher than the upper limit of the concentration range from the measurement value of the concentration meter 17. It is preferable that the control unit 40 performs measurement with the level meter 30 and the water level meter 31 and corrects the resin concentration in the tank 18 calculated by the concentration meter 17 after a predetermined time has elapsed after the first pump P1 is stopped.

[0037] If the control unit 40 determines that the concentration of the used resin in the tank 18 is higher than a predetermined concentration (step S30; Yes), it supplies pure water from the pure water tank 28 to the tank 18 to reduce the resin concentration in the tank 18 (step S32).

[0038] If the concentration of the used resin in the tank 18 is not higher than the upper limit of the predetermined concentration range (step S30; No), the control unit 40 determines whether the concentration of the used resin in the tank 18 is lower than the predetermined concentration range (step S33). The control unit 40 determines whether the resin concentration in the tank 18 is lower than the lower limit of the concentration range from the measurement value of the concentration meter 17.

[0039] When the control unit 40 determines that the concentration of the used resin in the tank 18 is lower than a predetermined concentration (step S33; Yes), the control unit 40 drains water through the filter 25 to adjust the concentration (step S34). Specifically, the control unit 40 drains water in the tank 18 through the filter 25 to adjust the concentration of the used resin to be higher. The control unit 40 can increase the concentration of the used resin by driving the drain pump P3 to remove the water in the tank 18. The control unit 40 can also increase the resin concentration by increasing the amount of used resin while reducing the amount of water in the tank 18 by driving the first pump P1 and supplying slurry from the storage tank 12 into the tank 18 while discharging the water in the tank 18 through the filter 25 and the drain pipe 26. In this case, the amount of fluid in the tank 18 can be maintained at a predetermined amount.

[0040] After the resin concentration in the tank 18 is within a predetermined range, the control unit 40 drives the second pump P2 (step S22). The control unit 40 sends a control signal to the second pump P2 to drive the second pump P2, thereby operating the second pump P2 and supplying the slurry in the tank 18 to the dehydrator 22. At this time, the control unit 40 drives the agitator 19 to homogenize the slurry in the tank 18.

[0041] The control unit 40 performs a dehydration process (step S24). The dehydrator 22 separates the water contained in the supplied slurry from the used resin. This separates the water from the used resin, making it possible to produce radioactive waste with a low water ratio.

[0042] The concentration control equipment 11 measures the resin concentration of the slurry supplied to the tank 18 with a concentration meter 17, and adjusts the concentration in the tank 18 based on the measurement result, thereby making it possible to maintain the resin concentration in the tank 18 at a predetermined concentration. By controlling the concentration based on the resin concentration, downstream processing can be performed with a stable load.

[0043] When the concentration of the used resin in the slurry flowing through the first pipeline 15 is low, the concentration control equipment 11 can set the resin concentration within a predetermined range by extending the supply time of the slurry from the storage tank 12 to the tank 18 while draining the water in the tank 18 through the filter 25. For example, when the resin concentration of the slurry flowing through the first pipeline 15 is 1 vol% and the required resin concentration is 10 vol%, the concentration control equipment 11 can set the concentration of the used resin in the tank 18 to the desired concentration by supplying the slurry from the storage tank 12 to the tank 18 for a time 10 times longer than that for the desired concentration.

[0044] In addition, if the concentration of used resin in tank 18 is high, the concentration control equipment 11 can lower the concentration of the slurry in tank 18 by adding pure water from the pure water tank 28 to tank 18 to increase the proportion of water.

[0045] The concentration management equipment 11 determines the concentration of the used resin relative to a predetermined concentration in the tank 18 based on the measured value of the concentration meter 17 by the control unit 40. The concentration management equipment 11 may also determine the concentration of the used resin relative to a predetermined concentration based on the measured value of the level meter 30. When determining the concentration of the used resin relative to a predetermined concentration based on the measured value of the level meter 30, the concentration management equipment 11 may repeat the process of, for example, flowing 500 liters of used resin into the tank 18, stopping the first pump P1, and measuring with the level meter 30 when an interface is generated in the tank 18. That is, the concentration management equipment 11 measures the concentration of the used resin in the tank 18 by the level meter 30 every 500 liters until the predetermined amount is reached. The concentration management equipment 11 may also measure the concentration from the height of the interface of the used resin in the tank 18 by the level meter 30 after a predetermined amount of used resin flows into the tank 18 and the first pump P1 is stopped.

[0046] In the concentration control equipment 11 of the present embodiment, the water in the tank 18 is discharged by the drainage pump P3, but the water in the tank 18 that reaches the filter 25 may be discharged by head pressure (for example, by overflow). This makes it possible to drain the water in the tank 18 without providing the drainage pump P3.

[0047] [effect] The concentration control equipment 11 according to the first aspect of the present disclosure includes a tank 18 for storing a slurry in which resin, which is radioactive waste, is mixed with water, a first pipeline 15 for supplying the slurry to the tank 18, a concentration meter 17 for measuring the resin concentration of the slurry in the first pipeline 15, and a concentration adjustment mechanism for adjusting the resin concentration in the tank 18 based on the measurement result of the concentration meter 17.

[0048] This makes it possible to supply the slurry containing the radioactive material to the downstream side at a stable concentration.

[0049] A concentration control equipment 11 according to a second aspect of the present disclosure is the concentration control equipment 11 according to the first aspect, wherein the tank 18 is provided with a level meter 30 inside the tank 18 for measuring the resin concentration of the slurry inside the tank 18, and the concentration adjustment mechanism adjusts the concentration of the resin in the tank 18 based on the measurement results of the concentration meter 17 and the level meter 30.

[0050] This allows the concentration of the slurry in the tank 18 to be confirmed.

[0051] The concentration control equipment 11 according to the third aspect of the present disclosure is the concentration control equipment 11 according to the first or second aspect, and has a second pipeline 20 connected to the tank 18 and supplying the slurry to a dehydrator 22 that separates the water and resin contained in the slurry.

[0052] This allows the water and used resin contained in the slurry to be separated, and the separated water and used resin further downstream of the dehydrator 22 can be appropriately treated.

[0053] A concentration control facility 11 according to a fourth aspect of the present disclosure is the concentration control facility 11 according to the first or second aspect, and the concentration adjustment mechanism calculates the concentration of the slurry by integrating the measurement results of the concentration meter.

[0054] This makes it possible to supply the slurry containing the radioactive material to the downstream side at a stable concentration.

[0055] A concentration control equipment 11 according to a fifth aspect of the present disclosure is a concentration control equipment 11 according to any one of the first to fourth aspects, in which the concentration adjustment mechanism is connected to a first pipeline 15 and includes a first pump P1 for pumping slurry into a tank 18, and the first pump P1 is activated or stopped based on the measured value of the slurry concentration by a concentration meter 17 to adjust the resin concentration in the tank 18.

[0056] This makes it possible to supply the slurry containing the radioactive material to the downstream side at a stable concentration.

[0057] A concentration control equipment 11 according to a sixth aspect of the present disclosure is a concentration control equipment 11 according to any one of the first to fifth aspects, and the concentration adjustment mechanism includes a filter 25 in the tank 18 and a water supply unit that supplies water to the tank 18, and when the resin concentration in the tank 18 is lower than a predetermined resin concentration, the resin concentration of the slurry is increased by draining water through the filter 25, and when the concentration of the slurry is higher than the predetermined resin concentration, the water supply unit supplies water into the tank 18 to decrease the concentration of the slurry.

[0058] This makes it possible to supply the slurry containing the radioactive material to the downstream side at a stable concentration.

[0059] A concentration management method according to a seventh aspect of the present disclosure includes the steps of supplying a slurry in which resin, which is radioactive waste, is mixed with water to tank 18, measuring the resin concentration of the slurry to be supplied to tank 18, and adjusting the resin concentration in tank 18 based on the measurement results of the resin concentration.

[0060] This makes it possible to supply the slurry containing the radioactive material to the downstream side at a stable concentration. [Explanation of symbols]

[0061] 10 Resin processing equipment 11 Concentration control equipment 12 Storage tank 14, 16, 21, 27 On-off valve 15 1st pipeline 17 Densitometer 18. Tank 19 Mixer 20 2nd pipeline 22 Dehydrator 23 Dehydration pipeline 25 Filters 26 Drainage pipeline 28 Pure Water Tank 29 Pure water pipe 30 Level Gauge 40 Control section 100 Nuclear equipment P1 First pump P2 Second pump P3 Drainage pump

Claims

1. A tank for storing a slurry in which resin, which is radioactive waste, is mixed with water; A first pipeline for supplying a slurry to the tank; a concentration meter for measuring a resin concentration of the slurry in the first pipeline; and a concentration adjustment mechanism that adjusts the resin concentration in the tank based on the measurement results of the concentration meter.

2. The tank includes a level meter disposed therein for measuring a resin concentration of the slurry in the tank, The concentration adjustment mechanism adjusts the concentration of the resin in the tank based on the measurement results of the concentration meter and the level meter. The concentration control equipment according to claim 1.

3. A second pipe is connected to the tank and supplies the slurry to a dehydrator that separates the water and the resin contained in the slurry. The concentration control equipment according to claim 1 or 2.

4. The concentration adjustment mechanism calculates the concentration of the slurry by integrating the measurement results of the concentration meter. The concentration control equipment according to claim 1 or 2.

5. the concentration adjustment mechanism includes a first pump connected to the first pipeline and configured to pump the slurry into the tank; The first pump is operated or stopped based on the measured value of the concentration of the slurry by the concentration meter to adjust the resin concentration in the tank. The concentration control equipment according to claim 1 or 2.

6. the concentration adjustment mechanism includes a filter in the tank and a water supply unit that supplies water to the tank; When the resin concentration in the tank is lower than a predetermined resin concentration, the water is discharged through the filter to increase the resin concentration of the slurry, and when the concentration of the slurry is higher than the predetermined resin concentration, water is supplied into the tank by the water supply unit to decrease the concentration of the slurry. The concentration control equipment according to claim 1 or 2.

7. Supplying a slurry of radioactive waste resin mixed with water to a tank; Measuring the resin concentration of the slurry supplied to the tank; adjusting the resin concentration in the tank based on the measurement result of the resin concentration; Including, Concentration control method.

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