JP4801638B2 - Mortar manufacturing system for solidification of radioactive waste and method for manufacturing mortar for solidification thereof - Google Patents

Description

  The present invention relates to a radioactive mortar solidification mortar production system and a radioactive waste solidification mortar production method. In particular, the present invention relates to a mortar production system for solidifying radioactive waste suitable for producing mortar used for solidifying radioactive solid waste, and a method for producing the mortar.

  Radioactive solid waste composed of noncombustible miscellaneous solids generated at nuclear power plants and the like is stored in a dedicated drum can and temporarily stored in a waste storage such as a nuclear power plant. When the radioactive solid waste stored in this dedicated drum can is transported to a burial site outside the nuclear power plant and disposed of, the radioactive solid waste is separated by the specified type at the nuclear power plant and repacked in the dedicated drum can. After that, a method of filling the solidified material is frequently used.

  As a solidifying material for radioactive solid waste, a mortar produced by kneading raw materials such as cement, aggregate and water is often used. Mortar as a solidification material for radioactive solid waste needs to strictly manage the mixing ratio of raw materials, kneading temperature, kneading time, etc. in order to obtain high quality in underground burying for a long time.

  Conventionally, at least one of the kneader and the agitator has been provided with a measuring device such as a viscosity measuring device for examining the properties of the cement paste, and the amount of cement, water, etc. to the kneading device is controlled based on the measurement signal from this measuring device. A technique related to a radioactive waste solidifying apparatus is disclosed (for example, see Patent Document 1). The radioactive waste solidifying device described in Patent Document 1 includes a fluidity control device that inputs a measurement signal from the measuring instrument, and opens and closes transfer valves such as cement and water according to the determination signal of the fluidity control device. It is a device that automatically controls the properties of the cement paste by adjusting the opening of the transfer valve.

JP-A-8-152498

  However, in the radioactive waste solidifying device described in Patent Document 1, the property of the cement paste is controlled based on a measurement signal from a measuring instrument such as a viscosity measuring instrument provided in a kneader or the like. There is a concern about the cement paste sticking to the measuring instrument. If the cement paste adheres to the measuring instrument, the measurement accuracy may decrease or the measurement may become impossible, and the properties of the cement paste cannot be properly controlled.

  In addition, there is a concern about the stable and precise operation of these transfer valves that require high accuracy due to cement paste adhering to the transfer valves such as cement and water. In other words, when considering the possibility of cement paste sticking, control using a measuring instrument such as a viscosity measuring instrument or a transfer valve is concerned with the realization of stable operation over a long period of time. Furthermore, attaching a measuring instrument such as a viscosity measuring instrument or a transfer valve to a kneader or the like complicates the structure of the apparatus.

  In addition, as a general apparatus, there is an apparatus that supplies a raw material to a kneader by opening and closing a discharge valve such as a butterfly valve provided at a lower portion of a hopper into which raw materials such as cement and aggregate are charged. With a simple discharge valve, it is difficult to supply a highly accurate and stable raw material to the kneader.

  The present invention has been made in view of the above circumstances, and its problem is to solidify radioactive waste that can stably and accurately supply mortar production raw materials such as cement and aggregate to a kneader. It is to provide a mortar production system.

Means and effects for solving the problems

  As a result of intensive studies to solve the above-mentioned problems, the present inventors do not use a measuring instrument such as a viscosity measuring instrument that is in direct contact with a raw material that causes a problem of fixation of the raw material as in the prior art, Rather than trying to control the feed rate of raw materials with high accuracy using valves such as transfer valves and discharge valves, the total weight of the entire system including the mortar production raw material in the system was continuously measured and measured continuously. It has been found that the above problem can be solved by adjusting the supply amount of the mortar production raw material by changing the total weight. The present invention has been completed based on this finding.

  The mortar production system for solidifying radioactive waste according to the present invention (hereinafter referred to as a mortar production system) has the following features in order to solve the above problems. That is, the mortar production system of the present invention includes the following features alone or in combination.

  The first feature of the mortar production system according to the present invention for achieving the above-mentioned object is that a container into which a mortar production material composed of at least one of cement and aggregate is charged, and a container disposed below the container. A supply device for supplying the mortar production raw material charged into the container to a kneader, and the mortar production raw material while being supplied to the kneader after being charged into the container, the container, And a measuring device for continuously measuring the total weight of the supply device, and the supply of the mortar production raw material to the kneader is stopped when the total weight continuously measured by the measuring device reaches a predetermined weight And a control device.

  According to this configuration, the supply amount of the mortar production raw material to the kneader is controlled using the total weight of the mortar production raw material, the container, and the supply device continuously measured by the measuring device. In this total weight measurement, the mortar production raw material is not in direct contact with the weighing device, that is, the measurement accuracy is not affected by the mortar production raw material as in the prior art. In addition, although the mortar production raw material may adhere to or stay in the container and the supply device, the present invention provides the weight of the mortar production raw material while being supplied to the kneader from the supply device. Since the change is grasped, the mortar production raw material attached to the container and the supply device can be ignored, and the mortar production raw material attached to the container and the supply device does not cause an error in the supply amount.

  Therefore, according to the present invention, mortar production raw materials such as cement and aggregate can be stably and accurately supplied to the kneader. Further, a valve or the like that requires high accuracy as in the prior art is not particularly necessary, and the system is simplified, the equipment cost is reduced, and the reliability of raw material supply is improved.

  Moreover, the 2nd characteristic in the mortar manufacturing system which concerns on this invention is that the said supply apparatus is comprised from a screw type conveyor or a belt type conveyor.

  According to this configuration, the mortar production raw material can be continuously supplied to the kneader at a constant volume. That is, mortar production raw materials such as cement and aggregate can be supplied to the kneader more stably and with high accuracy.

  Moreover, the 3rd characteristic in the mortar manufacturing system which concerns on this invention is that the said mortar manufacturing raw material is a mixed raw material which mix | blended cement and the aggregate by the predetermined | prescribed ratio.

  According to this configuration, the number of containers and the number of supply devices into which mortar production raw materials are charged can be reduced. This simplifies the system and reduces equipment costs.

  Next, the mortar production method for solidifying radioactive waste according to the present invention (hereinafter referred to as a mortar production method) has the following characteristics in order to solve the above problems.

  A feature of the mortar production method according to the present invention for achieving the above-described problems is that a mortar production raw material composed of at least one of cement and aggregate is charged into a container, and a raw material charging step is charged into the container. A raw material supply step of supplying the mortar manufacturing raw material to a kneader by a supply device disposed below the container, and the mortar manufacturing raw material while being supplied to the kneader after being charged into the container A measuring step for continuously measuring the total weight of the container and the supply device, and the mortar production raw material to the kneader when the total weight continuously measured by the measuring step reaches a predetermined weight. And a control step of stopping the supply of.

  According to this configuration, the supply amount of the mortar production raw material to the kneader is controlled using the total weight of the mortar production raw material, the container, and the supply device measured continuously. The weighing accuracy in weighing the total weight is not affected by the mortar production raw material as in the prior art. In addition, although the mortar production raw material may adhere to or stay in the container and the supply device, the present invention provides the weight of the mortar production raw material while being supplied to the kneader from the supply device. Since the change is grasped, the mortar production raw material attached to the container and the supply device can be ignored, and the mortar production raw material attached to the container and the supply device does not cause an error in the supply amount.

  Therefore, according to the present invention, mortar production raw materials such as cement and aggregate can be stably and accurately supplied to the kneader. Further, a valve or the like that requires high accuracy as in the prior art is not particularly necessary, and the system is simplified, the equipment cost is reduced, and the reliability of raw material supply is improved.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Mortar, which is frequently used as a filling and solidifying material for radioactive solid waste, is manufactured by kneading raw materials such as cement, aggregate, water and water reducing agent. In order to obtain a high-quality solidified product, it is necessary to strictly control the mixing ratio of the raw materials of the mortar used as the solidified material for radioactive solid waste. The mortar production system according to the present invention is suitable as a system for producing high-quality mortar used in solidification processing of radioactive solid waste. However, the mortar production system according to the present invention is not limited to the solidification treatment of radioactive solid waste. For example, it can also be used when mixing liquids such as radioactive concentrated waste liquid generated from nuclear power plants with cement.

  First, the configuration of the mortar manufacturing system according to the present invention will be described. FIG. 1 is a block diagram showing a mortar manufacturing system 1 according to an embodiment of the present invention. In addition, in the following description, although it demonstrates for cement among mortar manufacturing raw materials, it is the same also when targeting aggregate. The same applies to a mixed material in which cement and aggregate are mixed in advance at a predetermined ratio. By using a mixed material in which cement and aggregate are mixed at a predetermined ratio, the number of containers into which mortar production raw materials are charged and the number of supply devices can be reduced. This simplifies the system and reduces equipment costs.

  As shown in FIG. 1, the mortar production system 1 according to the present embodiment kneads a container 2 (hereinafter referred to as a hopper 2) into which cement (a mortar production raw material) is charged and a cement charged into the hopper 2. A screw conveyor 3 (supply device) for supplying to the machine 51, a kneader 51 for kneading raw materials such as cement, aggregate, water, water reducing agent, and the kneader 51 from the screw conveyor 3 after being put into the hopper 2. A measuring device 7 for continuously measuring the total weight of the cement, the hopper 2 and the screw type conveyor 3 while being supplied to the machine, and when the total weight continuously measured by the measuring device 7 reaches a predetermined weight And a control device 8 for stopping the supply of cement to the kneading machine 51. The black arrow in FIG. 1 shows the flow of cement, and the white arrow shows the flow of measured weight data. For example, the control device 8 includes a data capturing unit that captures data from the weighing device 7, a data storage unit that stores the captured data, and a command transmission unit that transmits a command to each device based on the stored data. Have.

  Next, each apparatus of the mortar manufacturing system according to the present invention will be described. FIG. 2 is a schematic side view of an apparatus constituting the mortar manufacturing system 1 shown in FIG. FIG. 3 is a schematic plan view of the apparatus shown in FIG.

  First, the hopper 2 which comprises the mortar manufacturing system 1 is demonstrated. The hopper 2 has a hopper insertion port 2a having a circular shape in plan view for feeding cement into the upper portion. The hopper insertion port 2a may be a rectangular shape in plan view. Above the hopper 2 is disposed a cement silo (not shown) for storing cement, or a cement conveying device (not shown) attached to the cement silo for conveying cement from the cement silo to the hopper input port 2a. The The discharge port 55 is a discharge port of a cement silo or a cement conveying device. A buffer member 52 is disposed between the discharge port 55 and the hopper input port 2a to guide cement from the discharge port 55 to the hopper input port 2a. The buffer member 52 cuts the discharge port 55 (cement silo or cement conveying device) and the hopper input port 2a (hopper 2) in terms of load, and is made of a material such as a canvas material.

  The hopper 2 is a container having a capacity capable of receiving more cement than the amount required for one batch of mortar kneading production in the kneader 51, and the bottom is connected to the screw conveyor 3.

  The screw type conveyor 3 is disposed below the hopper 2 and has a conveyor driving device 3b at one end and a conveyor discharge port 3a in the vicinity of the other end. The screw type conveyor 3 is a supply device that conveys the cement charged into the hopper 2 and continuously supplies the cement to the kneader 51 with a constant capacity from the conveyor discharge port 3a. The supply device is preferably a system such as a screw conveyor 3 that can supply cement to the kneader 51 relatively uniformly and continuously. In addition, as a supply apparatus, what is necessary is just an apparatus which can convey and supply a cement comparatively uniformly continuously, and is not limited to the screw type conveyor 3. FIG. Moreover, as shown in FIG. 2, although the screw type conveyor 3 is arrange | positioned horizontally, you may incline the screw type conveyor 3 to a conveyance possible angle from relations, such as installation space. The conveyor drive device 3b is a device that drives the screw conveyor 3 by electric drive or the like, and preferably has a system and structure that can be stopped instantaneously or in an extremely short time when receiving a cement supply stop command.

  A kneader 51 for kneading raw materials such as cement, aggregate, water and water reducing agent is disposed below the conveyor outlet 3a of the screw conveyor 3. The kneader 51 has a kneader supply port 51a through which cement is supplied. Between the conveyor discharge port 3a and the kneader supply port 51a, a buffer member 53 for guiding cement from the conveyor discharge port 3a to the kneader supply port 51a is disposed. The buffer member 53 cuts the conveyor discharge port 3a (screw type conveyor 3) and the kneading machine supply port 51a (kneading machine 51) in terms of load, and is made of a material such as canvas material. In addition, the buffer member 52 and the buffer member 53 cut the mortar production system 1 from the cement silo or the cement conveying device and the kneading machine 51 in terms of load, and weight calibration is performed in advance. By canceling the influence before and after, it is possible to obtain measurement accuracy with a high total weight.

  The kneader supply port 51 a is a supply port for supplying cement from the screw conveyor 3 to the kneader 51. In order to prevent the influence of moisture from the kneader 51 to the screw conveyor 3, a valve (not shown) that closes when the raw material is kneaded may be provided in the kneader supply port 51a. A mortar discharge valve 54 attached to the lower portion of the side wall of the kneading machine 51 is for discharging the mortar produced by kneading by the kneading machine 51 to a mortar hopper (not shown) for temporarily storing the mortar. It is a valve.

  The weighing device 7 for continuously measuring the total weight of the cement, the hopper 2, and the screw conveyor 3 while being fed to the kneader 51 from the screw conveyor 3 after being put into the hopper 2 includes the hopper 2 and the screw type A frame 4 disposed so as to surround the hopper 2 and the screw type conveyor 3 in order to suspend and support the conveyor 3 from above, and a load meter 5a (5) attached between the upper end of the hopper 2 and the frame 4. And a load meter 5b (5) attached between the upper end of the screw conveyor 3 and the frame 4.

  The frame 4 is formed, for example, by assembling steel materials, and is disposed so as not to directly contact the hopper 2 and the screw type conveyor 3. The load meter 5 has a structure and capability capable of continuously measuring the total weight of cement, the hopper 2 and the screw conveyor 3 while being supplied to the kneader 51 from the screw conveyor 3 after being put into the hopper 2. have. In the present embodiment, the total number of load cells 5 is three, but the present invention is not limited to this. The measured value of the total weight can be easily obtained by inputting signals from the plurality of load cells (5a, 5b) to a weight calculator (not shown). It is preferable that the load meter 5 and the weight calculator regularly ensure accuracy by using a verified weight to ensure reliability.

  The control device 8 is a device that performs control to stop the supply of cement to the kneader 51 when the total weight continuously measured by the weighing device 7 reaches a predetermined weight, for example, a continuous measurement weight storage unit (Not shown), a command transmitter (not shown), and the like.

  Next, operation | movement of the mortar manufacturing system 1 which concerns on this embodiment is demonstrated. FIG. 4 is a control flow diagram of the mortar manufacturing system 1 shown in FIG. It is assumed that the required amount of cement is received in advance in the cement silo. In general, mortar kneading is performed in batch units by a kneader 51.

  First, an amount of cement equal to or greater than the kneading batch is charged from the cement silo to the hopper 2 directly from the cement silo or via the cement conveying device via the buffer member 52 and the hopper charging port 2a (raw material charging step, step 1 (hereinafter referred to as S1. The same applies to other steps). The total weight of the cement, the hopper 2 and the screw conveyor 3 while being supplied to the kneader 51 from the screw conveyor 3 after being put into the hopper 2 is at least as much as the cement from the outlet 55 to the hopper 2. From the start of charging until the cement supply from the screw conveyor 3 to the kneading machine 51 is completed, the measurement is continuously performed by the measuring device 7 (metering step).

  If it is confirmed that cement has been charged into the hopper 2 (S2), the control device 8 accumulates the total weight measured at the time when the cement has been charged as the initial weight (S3). Then, the operation of the screw type conveyor 3 is started (S4). The cement dropped from the hopper 2 onto the screw conveyor 3 is transported by the screw conveyor 3 and is relatively uniformly and continuously transferred from the conveyor discharge port 3a to the kneader 51 through the buffer member 53 through the buffer member 53. Supplied (raw material supply process). Here, in the kneading machine 51, the aggregate supplied by the same method as the cement, the water and the water reducing agent added by a separate method are kneaded to produce mortar.

  The total weight measured by the weighing device 7 becomes a small value corresponding to the supplied weight together with the cement supplied from the conveyor discharge port 3a to the kneader 51. If the control device 8 confirms that the total weight to be measured has reached the set weight (= initial weight−required weight for supplying cement to the kneader 51) (S5), the control device 8 is screwed at that time. A cement supply stop command is issued to the type conveyor 3, and the screw type conveyor 3 stops its operation (S6). The supply of cement to the kneader 51 stops when the screw conveyor 3 stops (control process). In terms of control, the setting weight obtained by subtracting the required weight of cement to be supplied to the kneading machine 51 from the initial weight is the end point management weight, but the kneading machine 51 increases with the operating time of the screw conveyor 3. By displaying on the operation panel (not shown) of the mortar manufacturing system 1 the cement supply weight to the kneader 51 and the cement supply required weight to the kneader 51 obtained by subtracting the set weight from the initial weight, the operator can supply the cement. It is easy to recognize the change in weight and its value.

  According to the present embodiment, the total weight of the cement, the hopper 2, and the screw conveyor 3 while being supplied to the kneader 51 from the screw conveyor 3 after being put into the hopper 2 is continuously measured by the weighing device 7. Based on the measured value, the amount of cement supplied to the kneader 51 is controlled. In the measurement of the total weight, the cement does not directly contact the weighing device 7, that is, the measurement accuracy is not affected by the cement as in the prior art. In addition, the cement may adhere to or stay on the hopper 2 and the screw type conveyor 3. In this embodiment, the cement is put into the hopper 2 and then supplied from the screw type conveyor 3 to the kneader 51. Since the change in the weight of the cement is grasped, the cement adhering to the hopper 2 and the screw type conveyor 3 can be ignored, and the cement adhering to the hopper 2 and the screw type conveyor 3 becomes an error in supply amount. There is no.

  That is, according to the present invention, mortar production raw materials such as cement and aggregate can be stably and accurately supplied to the kneader. Further, a valve or the like that requires high accuracy as in the prior art is not particularly necessary, and the system is simplified, the equipment cost is reduced, and the reliability of raw material supply is improved.

  In addition, since the amount of cement supplied to the hopper 2 from the discharge port 55 of the cement silo or the cement conveying device can be controlled to an arbitrary amount below the capacity of the hopper 2 and 1 kneading batch or more, the raw material is input to the hopper 2. Therefore, the mortar manufacturing system according to the present invention can be simplified in structure as compared with the prior art, and problems such as control valve failure and material clogging can be achieved. There is no system.

  The mortar kneaded and manufactured in the kneader 51 opens the mortar discharge valve 54 attached to the kneader 51 and is discharged to a mortar hopper on the downstream side. Further, the mortar stored in the mortar hopper is filled in a necessary amount in a mortar pump (not shown) or a dedicated drum can (not shown) containing radioactive solid waste by natural fall to complete a series of operations.

  The kneading machine 51, the mortar hopper, the mortar pump, and the piping connecting them are washed with clean water or reused water after the solidification of the radioactive solid waste is completed and before the mortar solidifies. Waste water that has washed these devices is sent to a washing tank (not shown) and separated into sludge and supernatant. The supernatant water is sent to a supernatant water tank (not shown) or the like by pump suction or the like and reused. The sludge accumulated below is transferred to a storage container (not shown) by a sludge pump (not shown) and solidified, or a sludge container (not shown) is connected via a packing under the washing tank. A method in which sludge is stacked and accommodated in the sludge container and the sludge container is replaced when the sludge is stacked and accommodated up to the top of the sludge container is used.

(First modification)
Next, as a first modification, a mortar manufacturing system 11 using a belt conveyor 13 for transporting and supplying cement to the kneader 51 will be described. FIG. 5 is a schematic side view showing a mortar manufacturing system 11 in which the screw conveyor 3 shown in FIG. FIG. 6 is a schematic plan view of the apparatus shown in FIG. The mortar production system 11 has the same configuration as the mortar production system 1 described above except that the belt-type conveyor 13 is used as a supply device for supplying cement supplied to the hopper 2 to the kneader 51. In the following description, the same devices and members as those of the mortar manufacturing system 1 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 5 and 6, the belt-type conveyor 13 includes a driving pulley 13b provided at an upstream end where cement is conveyed, a conveyor driving device 13g for driving the driving pulley 13b, and a driving pulley 13b. A driven pulley 13h that is driven via a belt, a cover (outer cylinder) 13f that is attached so as to surround the conveyor body in order to prevent cement from scattering, and a conveyor discharge port 13a are provided.

  A scraper 13d is attached to the ceiling of the cover 13f near the bottom downstream end of the hopper 2 so that the cement charged into the hopper 2 is conveyed relatively uniformly toward the kneader 51. Yes. A brush 13e for removing cement adhering to the belt is attached to the cover 13f in the vicinity of the conveyor discharge port 13a. Further, a stopper 13c is attached to the ceiling portion of the cover 13f in the vicinity of the upstream end portion of the conveyor so that cement dropped from the hopper 2 onto the belt does not spill upstream. These parts (13c, 13d, 13e) are accessories of the belt type conveyor 13.

  In the case of this modification, the weighing device 7 continuously measures the total weight of cement, the hopper 2, and the belt type conveyor 13 while being fed from the belt type conveyor 13 to the kneader 51 after being put into the hopper 2. To do. By using the belt type conveyor 13, cement can be continuously supplied to the kneader 51 with a constant capacity. That is, mortar production raw materials such as cement and aggregate can be supplied to the kneader 51 more stably and with high accuracy.

(Second modification)
Next, as a second modification, a mortar manufacturing system 21 in which the load meter 5 is disposed below the screw conveyor 3 will be described. FIG. 7 is a schematic side view showing a mortar production system 21 in which the load cell 5 shown in FIG. 2 is arranged below the screw conveyor 3. FIG. 8 is a schematic plan view of the apparatus shown in FIG. The mortar manufacturing system 21 has the same configuration as the mortar manufacturing system 1 described above except that the load meter 5 is disposed below the screw conveyor 3. In the following description, the same devices and members as those of the mortar manufacturing system 1 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 7 and 8, the weighing device 7 includes a gantry 24 disposed below the screw conveyor 3 to support the hopper 2 and the screw conveyor 3, and the screw conveyor 3 and the gantry 24. It is an apparatus provided with the load cell 5 (5a, 5b) arrange | positioned between. A thick plate 8 is arranged between the load cell 5 and the screw type conveyor 3 in order to ensure the stability of the load. The thick plate 8 is an accessory of the screw type conveyor 3.

  In the case of this modification, the weighing device 27 continuously measures the total weight of the cement, the hopper 2 and the screw conveyor 3 while being supplied to the kneader 51 from the screw conveyor 3 after being put into the hopper 2. To do. By arranging the load cell 5 on the lower side of the screw type conveyor 3, the member of the weighing device 27 for supporting the hopper 2 and the screw type conveyor 3 (the gantry 24 in this modification) is a member in the mortar manufacturing system 1. It is less than (Frame 4), and the installation space is also reduced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

It is a block diagram which shows the mortar manufacturing system which concerns on one Embodiment of this invention. It is a model side view of the apparatus which comprises the mortar manufacturing system shown in FIG. FIG. 3 is a schematic plan view of the apparatus shown in FIG. 2. It is a control flowchart of the mortar manufacturing system shown in FIG. It is a model side view which shows the mortar manufacturing system which replaced the screw type conveyor shown in FIG. 2 with the belt type conveyor. It is a schematic plan view of the apparatus shown in FIG. It is a model side view which shows the mortar manufacturing system which has arrange | positioned the load meter shown in FIG. 2 to the lower side of a screw type conveyor. It is a schematic plan view of the apparatus shown in FIG.

Explanation of symbols

1: Mortar manufacturing system 2: Container (hopper)
3: Supply device (screw type conveyor)
7: Metering device 8: Control device 51: Kneading machine

Claims (4)

A container into which a mortar production raw material made of at least one of cement and aggregate is charged;
A supply device that is disposed below the container and supplies the mortar production raw material charged into the container to a kneader;
A weighing device that continuously measures the total weight of the mortar production raw material, the container, and the supply device while being supplied to the kneader from the supply device after being charged into the container;
And a controller for stopping the supply of the mortar production raw material to the kneader when the total weight continuously measured by the metering device reaches a predetermined weight. A mortar manufacturing system for solidifying materials.   The said supply apparatus is comprised from a screw type conveyor or a belt type conveyor, The mortar manufacturing system for solidification of the radioactive waste of Claim 1 characterized by the above-mentioned.   The mortar production system for solidifying radioactive waste according to claim 1 or 2, wherein the mortar production raw material is a mixed raw material in which cement and aggregate are blended at a predetermined ratio. A raw material charging step of charging a container with a mortar production raw material made of at least one of cement and aggregate;
A raw material supply step of supplying the mortar production raw material charged into the container to a kneader by a supply device disposed below the container;
A metering step of continuously measuring the total weight of the mortar production raw material, the container, and the supply device while being supplied to the kneader from the supply device after being charged into the container;
And a control step of stopping the supply of the mortar production raw material to the kneader when the total weight continuously measured by the weighing step reaches a predetermined weight, A method for producing a mortar for solidifying a product.

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