JP2746353B2 - Treatment method for radioactive waste incineration ash - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating radioactive waste incineration ash from storage of radioactive waste incineration ash generated by incineration of radioactive combustible waste to disposal using microwaves. About.

[0002]

2. Description of the Related Art In general, radioactive waste incineration ash is produced by incinerating radioactive combustible waste, and does not affect the environment in which the ash is stored and other environments, such as exposure to workers. And is usually housed and stored in a double-lid container made of a stainless steel container with a double lid. But,
Since the radioactive waste incineration ash is light and easily scattered, there is a danger of potentially expanding pollution to the environment.
Therefore, it is required that the radioactive waste incineration ash be solidified into a stable shape by some method and disposed of.

[0003] In line with this requirement, radioactive waste incineration ash, for example, in a temporarily installed green house,
Workers wearing radioactive protective clothing such as full face masks and Tyvex suits are mixed with cement milk little by little using a general-purpose mortar mixer and solidified.

Further, radioactive waste incineration ash is subjected to solidification treatment using microwaves. The solidification treatment by microwave is to attach a retort at the bottom of the melting furnace and perform melting and solidification in the retort, after solidification is completed, separate the retort from the melting furnace, fill this retort into a waste container, Furthermore, it is stored for a long time after being subjected to mortar capping to form a stable waste package.

[0005]

However, in the conventional method for treating radioactive waste incineration ash, a container with a double lid is used to store and store the radioactive waste incineration ash.
This container with a double lid is for minimizing problems such as contamination of the work environment due to scattering of ash.However, removing the lid and taking out the radioactive waste incineration ash outside the container with a double lid The method requires a lot of man-hours, complicates the operation procedure, and has problems such as exposure to workers due to contamination during handling of radioactive waste incineration ash and long-term stability of the solidified body.

[0006] Further, the radioactive waste incineration ash is not always stored homogeneously in a container with a double lid, and may contain a large lump that has a great effect on the solidification work. When performing the melting and solidification treatment by microwave on radioactive waste incineration ash, such lump is visually separated when taken out of the container with a double lid, and measures such as separate treatment are taken. There was a problem of exposure to workers.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a safe and safe storage and storage environment for radioactive waste incineration ash stored in a lidded container. Another object of the present invention is to provide a method for treating radioactive waste incineration ash that can be handled without affecting the external environment other than the above and finally produce a stable waste package.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a lidded ash containing radioactive waste incinerated ash, which is removed from the opening of the lidded ash container containing radioactive waste incinerated ash using only a lid opening means. With the opening of the container closed with a cap, the ash container with the lid is raised by the ash container lifting device, and then the ash container with the lid at the raised position on the ash container lifting device is inverted,
By removing the cap from the opening of the lidded ash container, the radioactive waste incineration ash is supplied from the lidded ash container into the crusher through the opening, and the crusher appropriately removes the lump in the radioactive waste incineration ash. Crushed radioactive waste incinerated ash in a state where the lump is crushed into a melting furnace through an ash conveying means and supplied to a retort provided detachably at a lower portion of the melting furnace, After the radioactive waste incineration ash in the retort is melted and solidified by microwave irradiation to produce a radioactive waste solidified body, the radioactive waste incinerated ash is installed at the lower part of the melting furnace, and the first vertical moving device, the second vertical moving device,
The retort containing the radioactive waste solidified in the solidification hood in which the vertical moving device and the horizontal moving device are arranged,
Separated from the lower part of the melting furnace together with the retort holder while being held by the retort holder, and after lowering the retort holder by the first vertical moving device, put the retort holder on a horizontal moving device and horizontally transfer it for a predetermined distance, The retort is gripped by the gripper of the second vertical moving device and lifted from the retort holder, and further, the opening at the bottom of the solidified hood is opened by operating the opening / closing lid, and after moving the horizontal moving device, the second vertical moving device is used. The retort is lowered and transferred onto a waste container outside the solidification hood.

[0009]

According to the present invention, the lid is removed from the opening of the ash container with radioactive waste incineration ash using only the lid opening means, and the opening of the ash container with radioactive waste incineration ash is closed. With the cap closed, the ash container with the lid is raised by the ash container lifting / lowering device, and then the ash container with the lid at the raised position on the ash container lifting / lowering device is inverted, and the ash container with the lid is opened from the opening. By removing the cap, the radioactive waste incineration ash is supplied from the ash container with the lid into the crusher through the opening, and the crusher crushes the lump in the radioactive waste incineration ash into particles of an appropriate particle size. Pulverized radioactive waste incineration ash is fed into a melting furnace via ash transport means and supplied to a retort detachably provided at the lower part of the melting furnace. Melt incineration ash from radioactive waste
After being solidified to produce a solidified radioactive waste, it is installed at the lower part of the melting furnace and is provided with a first vertical moving device, a second vertical moving device,
In the solidification hood in which the horizontal moving device is disposed, the retort containing the solidified radioactive waste is separated from the lower part of the melting furnace together with the retort holder while being held by the retort holder. After being lowered by the moving device, the retort holder is placed on the horizontal moving device and horizontally transferred for a predetermined distance, and the retort is gripped and lifted from the retort holder by the gripper of the second vertical moving device. The opening is opened by operating the opening / closing lid, and after moving the horizontal moving device, the retort is lowered by the second vertical moving device and transferred to the waste container outside the solidification hood.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. An apparatus for solidifying radioactive waste incineration ash according to an embodiment of the present invention is installed in a solidification room of a concrete structure building. In this embodiment, radioactive waste incineration ash in a container with a double lid is stored and stored. Is what you do. This will be described below.

1 to 3, reference numeral 1 denotes a microwave generator, 2 denotes a waveguide attached to the microwave generator, 3 denotes a power monitor provided in the waveguide 2, and an incident detector. 4 and a reflection detector 5 for monitoring the state of microwave irradiation. Reference numeral 6 denotes an EH tuner, which includes an electric field adjuster 7 and a magnetic field adjuster 8, and adjusts the amplitude of the electric field and the magnetic field so that the object to be heated can be irradiated with microwaves most efficiently. Reference numeral 9 denotes two plates provided on the waveguide 2 such as a quartz plate made of a material having good microwave permeability.
Although microwaves are transmitted therethrough, they do not transmit radioactivity such as dust and fume, and separate a hot region and a cold region. Air at a predetermined pressure is always supplied to a space 10 between the two plates 9, and an alarm device 11 for detecting a pressure drop when the plate 9 is broken and preventing the radioactivity from flowing back is provided. .

Reference numeral 12 denotes a melting furnace to which the waveguide 2 is connected. Reference numeral 13 denotes a wide-angle non-contact type thermometer provided at the upper part of the melting furnace 12, which monitors the temperature of the object to be heated in the retort 15 and controls the supply amount of the radioactive waste incineration ash. An ITV 14 monitors the state of arc generation and gas combustion in the melting furnace 12 and the state of heating in the retort 15. Air is blown to a monitoring window in which the thermometer 13 and the ITV 14 are installed to prevent ash from adhering, so that the situation inside the melting furnace 12 can be accurately grasped.

Numeral 16 denotes a container with a double lid, which is shown in FIG. 4 and is sealed by covering an outer lid 16A and an inner lid 16B, and separates the radioactive waste incineration ash from a solidification chamber in which a solidification device is installed. Stored and stored in the ash collection storage room. Reference numeral 17 denotes an ash container transport cart that transports the container 16 with a double lid.

Reference numeral 18 denotes an outer lid removing manipulator having an air cylinder (first lid opening means), and 19 denotes an inner lid removing manipulator having an air cylinder (second lid opening means). It has four local hoods and is installed above the transport roller 20. Reference numeral 21 denotes a weight measuring device for the radioactive waste incineration ash.

Reference numeral 22 denotes an ash container lifting / lowering device, which comprises an L-shaped running rail 22A composed of a vertical portion and a horizontal portion, and a lifting gauge 22B capable of moving up and down the running rail 22A.

A coarse pulverizer 23, a fine pulverizer 24, and an incineration ash supply device 25 are arranged in order below the horizontal portion of the traveling rail 22A of the ash container lifting device 22 adjacent to the ash container lifting device 22. ing. The above manipulator 19 for removing the inner lid, the weight measuring device 21, the ash container elevating device 22,
The coarse crusher 23, the fine crusher 24, and the incineration ash supply device 25
It is installed in the hood 26.

Reference numeral 27 denotes an ash conveying means comprising a spiral spring feeder, which is bridged between the incineration ash supply device 25 and the melting furnace 12. Reference numeral 28 denotes an exhaust gas treatment device connected to the melting furnace 12,
0, has an off-gas fan 31, and discharges exhaust gas in the melting furnace 12 while preventing outflow of radioactivity.

Reference numeral 32 denotes a solidification hood provided at the lower part of the melting furnace 12. An opening 33 is formed at the bottom of the solidification hood 32, and a lifter 34 is provided below the opening 33. In addition, a lid 33A that can open and close the opening 33 is provided at the bottom.
Is provided.

An exhaust duct 35 is connected to the solidified hood 32. An exhaust HEPA filter 36 and an exhaust fan 37 are mounted in the exhaust duct 35. An air supply filter 38 is connected to the solidified hood 32. I have. With the exhaust fan 37 and the air supply filter 38, the inside of the solidified hood 32 is maintained at a negative pressure, ventilation is performed, and external leakage of radioactivity is prevented. The hood 26 is also connected to the exhaust duct 35.

A first vertical moving device 39, a second vertical moving device 40, and a horizontal moving device 41 are arranged in the solidification hood 32, and a retort holder is provided as a gripping / transporting means for receiving the retort 15 from below the melting furnace 12 and placing it thereon. 42 are used.

The first vertical moving device 39 is installed below the melting furnace 12 and moves the retort holder 42 up and down. The second vertical moving device 40 is located at a predetermined distance from the first vertical moving device 39 and has an opening 33 at the bottom of the solidified hood 32.
And a gripper 40 </ b> A capable of loading and unloading the retort holder 42.

The horizontal moving device 41 includes the first vertical moving device 3.
9 and the second vertical moving device 40 between the retort holder 42
, And is transported reciprocally. The carriage on which the linear bearings are mounted is moved by a cylinder on a rail.

Next, this embodiment will be described in accordance with the processing steps. Radioactive waste incineration ash generated by incineration of radioactive combustible waste is generated after incineration in a special incinerator, and is provided with a double-lided container 16 in a ash collection storage room separate from a solidification room in which a solidification device is installed. It is stored and stored.

Automatically by the remote instruction, the ash container transporting trolley 17 goes to receive the double-lided container 16 to the ash collection room,
The material is conveyed to a predetermined location in the solidification chamber and placed on the conveyance roller 20.

The outer lid 16A of the double-lided container 16 is removed by the outer lid removing manipulator 18 and then carried into the hood 26, and the inner lid 16B is burned by the inner lid removing manipulator 19 to incinerate radioactive waste. The ash is removed while being locally exhausted by the local exhaust hood 43A so that the ash is not scattered. The operation for opening and closing the lids is performed by an electromagnet attached to the lower part of the cylinder of the manipulators 18 and 19 when deenergized at the time of energization. When the energization is cut off, it is energized and lifts the outer lid 16A and the inner lid 16B. It is. Then, the air locally exhausted by the local exhaust hood 43A is sucked by the vacuum hose 43B.

Thereafter, the weight and the radiation dose rate of the radioactive waste incineration ash in the container 16 with the double lid are measured by the weight measuring device 21. Elevating gauge 22 of ash container elevating device 22
B, a cap with a damper is attached, and is set in a state where the opening of the container 16 with a double lid is covered with the cap with the damper, and the elevating gauge 2 gripping the container 16 with a double lid.
2B rises on running rail 22A.

When the lifting gauge 22B reaches the horizontal portion of the traveling rail 22A, the ash container 16 with the lid at the raised position is inverted, but the ash container 16 with the damper is prevented from scattering to the outside.

The cap with the damper is set up after reaching the top of the coarse crusher 23 and turned over. The damper of the cap with the damper is opened, and radioactive waste is discharged from the double lid container 16 to the coarse crusher 23 through the opening and the cap. Material incineration ash is supplied.

The coarse pulverizer 23 receives the radioactive waste incineration ash discharged from the double-covered container 16 so as not to leak the radioactive waste incineration ash, and performs the primary pulverization. The fine pulverizer 24 performs the secondary pulverization. In this process, the lumps in the radioactive waste incineration ash are crushed into particles of a suitable size.

In the incineration ash supply device 25, the coarse crusher 23,
The radioactive waste incinerated ash pulverized to an appropriate size by the pulverizer 24 is temporarily stored, and after measuring the weight and the radiation dose rate, is automatically and automatically transferred to the ash conveying means 27 by a fixed amount by a remote command. The incinerated ash from the radioactive waste is supplied into the retort 15.

In the melting furnace 12, microwaves from the microwave generator 1 are irradiated on the radioactive waste incineration ash in the retort 15, and the radioactive waste incineration ash is heated, melted, and allowed to cool. A solidified form of radioactive waste incineration ash of a certain size is formed therein. After the solidification is completed, the retort holder 42 on which the retort 15 is placed is separated from the lower part of the melting furnace 12.

Then, the retort holder 42 on which the retort 15 is placed is lowered by the first vertical moving device 39 and transferred onto the horizontal moving device 41, and the retort holder 42 is horizontally transferred by the horizontal moving device 41. , Stops under the second vertical movement device 40.

The retort 15 is gripped by the gripper 40A of the second vertical moving device 40. In this state, the retort 15 is taken out of the retort holder 42 and lifted upward, and the retort holder 42 is moved out of the vertical passage area of the second vertical moving device 40. Removed.

Next, the opening / closing lid 33 at the bottom of the solidified hood 32
After operating A to open the opening 33, the retort 15 is lowered by the second vertical moving device 40, transferred to the waste container 34A placed on the lifter 34, and the grip 40A of the second vertical moving device 40 is operated. By releasing the holding of the retort 15 from, the retort 15 is stored in the waste container 34A.

At this time, the waste container 34A is placed in the solidified hood 32.
Is press-fitted by a lifter 34 via a sealing material such as rubber packing, thereby preventing the radiation from leaking from the solidification hood 32 to the outside. Retort 1 with solidified body
After the radiation surface dose rate is measured, the waste container 34A containing the container 5 is filled with cement milk by a worker's hand, covered with a lid, and placed as a waste package in a waste container storage trolley in a solidified body temporary storage area. Transported and stored.

Then, the new retort 15 is lifter 34
And mounted on the lower portion of the melting furnace 12 in the reverse procedure. That is, the new retort 15 on the lifter 34 is gripped by the gripper 40A of the second vertical moving device 40 and raised through the opening 33 at the bottom of the solidification hood 32, and then the horizontal moving device 41 is moved to the second vertical moving device. Stop below 40. The new retort 15 is lowered by the second vertical moving device 40, accommodated in the retort holder 42, horizontally moved below the melting furnace 12 by the horizontal moving device 41, raised by the first vertical moving device 39, and moved up by the first vertical moving device 39.
Attached to the bottom of the This completes a series of operations.

According to the above configuration, the outer lid 16 is opened from the opening of the double-lid container 16 containing the radioactive waste incineration ash.
A, manipulator 1 for removing inner lid 16B from outer lid
8. Removal using only the manipulator 19 for removing the inner lid, and furthermore, the radioactive waste incineration ash stored in the container 16 with the double lid is automatically supplied into the coarse crusher 23 without manual operation, and coarse crushing is performed. Machine 23 and pulverizer 24,
The lumps in the radioactive waste incineration ash are crushed into particles of an appropriate size, and are introduced into the melting furnace 12 through the ash conveying means 27. Solidification can be enabled.

Then, the solidified radioactive waste produced by melting and solidifying the radioactive waste incinerated ash is automatically packed in a waste container 34A without manual operation by a series of transport means to produce a waste package. Can be safely stored outside.

As described above, the radioactive waste incinerated ash stored in the container 16 with a double lid is handled safely and without affecting the storage / storage environment and the other external environment, and is finally stable. A waste package can be made.

In this embodiment, the ash transport means 2
A spiral spring feeder is used as 7, but the present invention is not limited to this. Further, in this embodiment, a two-stage crusher including the coarse crusher 23 and the fine crusher 24 is used. However, one crusher may be used, and three or more crushers may be used or mixed in the preceding stage of the coarse crusher. It can be installed in combination with a metal separator or the like for removing metal lumps.

Further, in this embodiment, the double-lided container 16 is used as the lidded ash container, but a single lidded ash container may be used. In the present embodiment, the retort 15 is stored in one stage in the waste container 34A, but may be stored in a plurality of stages.

[0042]

As described above, according to the present invention,
Remove the lid from the opening of the lidded ash container containing the radioactive waste incineration ash using only the lid opening means, and further remove the radioactive waste incineration ash stored in the lidded ash container into the crusher without manual operation. It is automatically supplied and the crusher crushes the lumps in the radioactive waste incineration ash into particles of an appropriate size and throws them into the melting furnace through ash transport means. Melting and solidification of radioactive waste incineration ash can be enabled.

Then, the solidified radioactive waste produced by melting and solidifying the radioactive waste incinerated ash is automatically packed in a waste container without manual operation by a series of transport means to produce a waste package, Can be safely stored externally.

As described above, the radioactive waste incineration ash stored in the ash container with the lid is handled safely and without affecting the storage / storage environment and the other external environment, and finally becomes stable. It has the effect that a waste package can be made.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing steps of a method for treating radioactive waste incineration ash according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a process in the first half of FIG. 1;

FIG. 3 is a configuration diagram illustrating a latter half of the process of FIG. 1;

FIG. 4 is a side view of a container with a double lid used in the present embodiment.

[Explanation of symbols]

12 melting furnace 15 retort 16 ash container with lid (container with double lid) 16A outer lid 16B inner lid 18 manipulator for removing outer lid (first lid opening means) 19 manipulator for removing inner lid (second lid opening means) 23 Coarse pulverizer 24 Fine pulverizer 26 Ash container elevating device 27 Ash transport means 32 Solidification hood 33 Opening 33A Opening / closing lid 34A Waste container 39 First vertical moving device 40 Second vertical moving device 40A Gripper 41 Horizontal moving device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FIG21F 9/36 531 B09B 3/00 303L (72) Inventor Kodai Tamura 1-4-1, Yurakucho, Chiyoda-ku, Tokyo Sanki Kogyo (56) References JP-A-2-136799 (JP, A) JP-A-63-255699 (JP, A) JP-A-62-148896 (JP, A) Jpn. U) Japanese Utility Model Showa 59-7835 (JP, U) JP-B 63-7835 (JP, B1)

Claims (1)

(57) [Claims] 1. A lid is removed from an opening of a lidded ash container containing radioactive waste incineration ash using only a lid opening means, and a lid of the lidded ash container containing radioactive waste incinerated ash is closed with a cap. After the ash container with the lid is raised by the ash container elevating device, the ash container with the lid at the raised position on the ash container elevating device is inverted, and the cap is removed from the opening of the ash container with the lid. Supplied from the ash container with lid to the inside of the crusher through its opening, and the crusher crushed the lump in the incinerated ash into particles of appropriate particle size, and crushed the lump The radioactive waste incinerated ash in the state is put into the melting furnace via ash transport means and supplied to the retort detachably provided at the lower part of the melting furnace, and the radioactive waste in the retort is irradiated by microwave irradiation. Solidified radioactive waste by melting and solidifying incineration ash After the generation, the retort containing the solidified radioactive waste is retorted in a solidification hood which is installed at the lower part of the melting furnace and in which the first vertical movement device, the second vertical movement device, and the horizontal movement device are arranged. After being separated from the lower part of the melting furnace together with the retort holder while being held by the holder, the retort holder is lowered by the first vertical moving device, and then the retort holder is placed on the horizontal moving device and horizontally transferred by a predetermined distance, and the retort is moved. The retort is gripped and lifted from the holder by the gripper of the second vertical moving device, the opening at the bottom of the solidification hood is opened by operating the opening / closing lid, and after moving the horizontal moving device, the retort is moved by the second vertical moving device. Characterized in that the ash is lowered and transferred to a waste container outside the solidification hood.