JP2009109277A - Ultrasonic level gage and solidifying equipment of radioactive waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic level gage which is capable of accurately measuring the level of a liquid surface of a liquid in a vessel at the time when the liquid having solid contents is injected. <P>SOLUTION: The ultrasonic level gage 1 is installed in a hood 13 provided for a mortar injection device 12 of the solidifying equipment 10 of radioactive waste. The ultrasonic level gage 1 has a piezoelectric vibrator 2 and a cylindrical cone 4 fitted with a sound absorbing member 5 inside, which are attached to a head part 3. The sound absorbing member 5 is a hydrophilic and open-cell member (e.g. sponge). At the time when mortar 19 is injected from a mortar injection pipe 14 into a drum 20 filled with radioactive solid waste 21, an ultrasonic wave 8 is sent from the piezoelectric vibrator 2 to the liquid surface 22 in the drum 20. In the case when the mortar 19 scattered on the occasion of injection of the mortar sticks on the inside of the sound absorbing member 5, a solid such as sand and water contained in the mortar are absorbed into the sound absorbing member 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an ultrasonic level meter and a radioactive waste solidification processing apparatus, and more particularly to an ultrasonic level meter suitable for measuring the liquid level of a liquid containing solid content, and the ultrasonic level meter. The present invention relates to a solidification processing apparatus for radioactive waste.

  The non-contact ultrasonic level meter is used until the ultrasonic wave transmitted from the piezoelectric vibrator (ultrasonic vibrator) installed in the head part is reflected by the liquid surface of the measurement object and received by the piezoelectric vibrator. Is measured, and the distance to the liquid surface of the measurement object is calculated. Such an ultrasonic level meter can measure the distance to the liquid level without contacting the measurement object. For this reason, since the degree of contamination by radioactive material is small when measuring the liquid level of a fluid containing radioactive material, ultrasonic level meters are widely used in facilities in radiation management areas such as nuclear power plants.

  The ultrasonic wave transmitted from the ultrasonic level meter propagates with a predetermined spread depending on the size and shape of the piezoelectric vibrator included in the ultrasonic level meter. For this reason, when an obstacle exists in the vicinity of the measurement object, the ultrasonic wave reflected by the obstacle is received by the piezoelectric vibrator, and the distance to the measurement object cannot be accurately measured by the ultrasonic level meter. .

  To solve this problem, Japanese Patent Application Laid-Open No. 10-206213 proposes to arrange a cylindrical cone (waveguide) in front of the piezoelectric vibrator. The ultrasonic wave transmitted obliquely from the piezoelectric vibrator to the measurement object is reflected by the inner surface of the cone and propagates toward the measurement object. As a result, since the spread angle of the transmitted ultrasonic wave is limited, it is possible to reduce the interference risk of obstacles existing around the measurement object.

  Japanese Patent Application Laid-Open No. 2005-127722 describes that a sound absorbing material is provided on the inner surface of a cone of an ultrasonic level meter. This sound-absorbing material absorbs the ultrasonic waves transmitted from the piezoelectric vibrator and spreads, and prevents the ultrasonic waves from being irregularly reflected in the cone.

  When the liquid that is the object to be measured or the liquid droplet contained in the object to be measured adheres to the inner surface of the cone, the ultrasonic wave transmitted as a protrusion becomes the direction of the piezoelectric vibrator. There is a possibility of reflection. At this time, the ultrasonic level meter malfunctions as if there is an object to be measured at a short distance in the cone. Japanese Laid-Open Patent Publication No. 10-206213 further proposes providing a water-absorbing film on the inner surface of the cone. This water-absorbing film absorbs the liquid droplets even if they adhere, and prevents the liquid droplets from becoming a projection on the surface of the film.

  An example of a radioactive waste solidification processing apparatus is described in Japanese Patent Application Laid-Open No. 2000-75096. The solidification processing apparatus includes a kneader for supplying mortar by supplying cement, sand and water, and a mortar filling apparatus for injecting the mortar generated by the kneader into a drum can filled with radioactive solid waste. . The mortar filling device includes a liquid level gauge that measures the liquid level of the mortar injected into the drum. When the liquid level of the mortar in the drum reaches a predetermined level, the injection of the mortar into the drum is stopped.

JP-A-10-206213 JP 2005-127722 A JP 2000-75096 A

  The radioactive waste solidification processing apparatus is an apparatus for producing mortar and filling the mortar into a drum can filled with radioactive solid waste. The liquid level of the mortar filled in the drum can is measured with an ultrasonic level meter to monitor whether the liquid level has risen to a predetermined level. Mortar contains moisture and solids.

  The inventors have newly found that the following problems occur when the ultrasonic level meter described in Japanese Patent Laid-Open No. 10-206213 is applied to a solidification processing apparatus for radioactive waste. When mortar is injected into the drum, the mortar splashed from the drum reaches the inside of the cone of the ultrasonic level meter located above the drum, and adheres to the water-absorbing film provided inside the cone. To do. Moisture contained in the attached mortar is absorbed by the film. However, the cement and sand solids contained in the adhered mortar are not absorbed by the film and remain on the surface of the film. The ultrasonic wave transmitted from the piezoelectric vibrator of the ultrasonic level meter is reflected by the solid matter (sand or cement) adhering to the film above the liquid level of the mortar in the drum, and is reflected on the piezoelectric vibrator. Received. At this time, the ultrasonic level meter is as if the liquid level of the mortar is at the position where the solid content adheres based on the reflected wave from the solid content, even though the liquid level of the mortar is in the drum. Outputs a liquid level measurement signal (error signal).

  The inventors have newly found that the following problems occur even when the ultrasonic level meter described in Japanese Patent Laid-Open No. 2005-127722 is applied to a radioactive waste solidification treatment apparatus. When the mortar is injected into the drum can, the mortar splashed from the drum can adhere to the surface of the sound absorbing material provided on the cone of the ultrasonic level meter described in JP-A-2005-127722, which is located above the drum can. . Since this sound absorbing material does not have water absorption, moisture, sand, and cement contained in the mortar are left attached to the surface of the sound absorbing material. The ultrasonic wave transmitted from the piezoelectric vibrator of the ultrasonic level meter is reflected by moisture, sand and cement adhering to the surface of the sound absorbing material, and an error signal similar to that of JP-A-10-206213 is generated from the ultrasonic level meter. Is output.

  An object of the present invention is to provide an ultrasonic level meter and a radioactive waste solidification processing apparatus capable of accurately measuring the level of a liquid level in a container at the time of injection of a liquid containing a solid content. .

  The features of the present invention that achieve the above-described objects are: a cylindrical body attached to the head portion; a hydrophilic and open-cell sound absorbing member that is detachably attached to the inside of the cylindrical body; And a vibrator that is provided on the head so as to face the space surrounded by the objects and that transmits and receives ultrasonic waves.

  Since a hydrophilic and open-cell sound-absorbing member is installed in the cylindrical body located in front of the transducer that transmits and receives ultrasonic waves, the solid content scattered from the liquid surface including the solid content is removed. When the contained droplet adheres to the sound absorbing member, the liquid contained in the attached droplet is absorbed by the sound absorbing member. Further, the solid content contained in the attached droplets is stored in open bubbles in the sound absorbing member in association with the liquid absorbed by the sound absorbing member. Even if the scattered liquid droplets adhere to the sound absorbing member, the liquid and solid content contained in the liquid droplets do not remain on the surface of the sound absorbing member, so the level of the liquid level in the container at the time of injecting the liquid containing the solid content Can be measured with high accuracy.

The above-mentioned purpose is a kneading device for kneading mortar, a cover member covering the upper part of a waste storage container filled with radioactive waste, and a solidified material obtained by the kneading device attached to the cover member for waste storage A mortar injection device having a mortar injection pipe for injecting into a container, and an ultrasonic level meter attached to the cover member,
The ultrasonic level meter has a head portion attached to the cover member, a cylindrical body attached to the head portion, and a hydrophilic and open-cell sound absorption device detachably attached to the inside of the cylindrical body. This can also be achieved by a radioactive waste solidification processing apparatus that includes a member and a vibrator that transmits and receives ultrasonic waves and that is provided in the head so as to face the space surrounded by the cylindrical body.

  Furthermore, since the radioactive waste solidification processing apparatus has a low frequency of replacement of the sound absorbing member, the operating rate is improved.

  ADVANTAGE OF THE INVENTION According to this invention, when inject | pouring the liquid containing solid content in a container, the level of the liquid level of the liquid in a container can be measured with a sufficient precision.

  Examples of the present invention will be described below.

  An ultrasonic level meter according to Embodiment 1, which is a preferred embodiment of the present invention, will be described with reference to FIGS. A radioactive waste solidification processing apparatus equipped with the ultrasonic level meter 1 of this embodiment will be described with reference to FIG. The radioactive waste solidification processing device 10 includes a kneader 11, a pump 17, a mortar injection device 12, and a control device 18.

  The mortar injection device 12 includes an ultrasonic level meter 1, a hood (cover member) 13 that covers an upper portion of a drum can (waste storage container) 20, a mortar injection pipe 14, and a vibrator 15. The hood 13 includes a cylindrical portion 13A, a flat plate portion 13B provided at the upper end of the cylindrical portion 13A, and a support member 13C attached to the flat plate portion 13B. The support member 13C protrudes upward from the flat plate portion 13B, and a space 23 communicating with a space below the flat plate portion 13B is formed in the support member 13C. The ultrasonic level meter 1 is attached to the support member 13C.

  The mortar injection tube 14 penetrates the flat plate portion 13B of the hood 13 and extends in the vertical direction. A vibrator 15 is attached to the mortar injection tube 14 above the hood 13. The mortar injection pipe 14 is connected to the kneader 11 and the pump 17 by a pipe 16. The elevator (not shown) that moves the mortar injection pipe 14 and the hood 13 up and down is installed on a pedestal installed on the floor. The mortar injection tube 14 and the hood 13 are not coupled, and the hood 13 can be moved up and down along the mortar injection tube 14 by an elevator.

  The detailed structure of the ultrasonic level meter 1 will be described with reference to FIG. The ultrasonic level meter 1 includes a piezoelectric vibrator 2, a head portion 3, a cone (tubular body) 4, and a sound absorbing member 5. The sound absorbing member 5 is a hydrophilic open cell sound absorbing member (for example, sponge). A cone 4 that is a cylindrical member extends downward from the head portion 3 and is attached to a lower end portion of the head portion 3. That is, the upper end portion of the cone 4 meshes with a screw formed on the outer surface of the head portion 3 and is fixed by tightening the nut 7. The tip of the cone 4 is an open end, and a projection 6 that protrudes toward the central axis of the cone 4 is provided at the tip of the cone 4. An opening 24 is formed inside the protrusion 6. A cylindrical sound absorbing member 5 is disposed inside the cone 4 and is in contact with the inner surface of the cone 4. However, the sound absorbing member 5 is not bonded to the cone 4. The lower end of the sound absorbing member 5 is supported by the protrusion 6. The internal space 8 formed inside the sound absorbing member 5 communicates with the space in the hood 13 below the cone 4 via the opening 24. The piezoelectric vibrator 2 is provided at the lower end portion of the head portion 3 and faces the internal space 8. The piezoelectric vibrator 2 is connected to the control device 18 by a cable 9.

  Sponge, which is a kind of sound-absorbing member, is a hydrophilic material in which a large number of bubbles formed inside of a porous material having a large number of bubbles on the surface and inside are connected, and bubbles near the surface open to the outside. It is constituted by a certain open cell material (for example, polyurethane, polyolefin, foamed silicon, foamed rubber, etc.). The sponge, which is the sound absorbing member 5 used in this embodiment, is made of soft polyurethane having hydrophilicity and high elasticity.

  Since the sound absorbing member 5 (for example, flexible polyurethane foam) is an elastic body, it is compressed and deformed when pressure is applied from the outside. The sound absorbing member 5 is inserted in the compressed state from the opening portion 24 into the interior space 8 of the cone 4 to above the protruding portion 6. Thereafter, by removing the external force, the sound absorbing member 5 is restored to the original state, the outer surface is in contact with the inner surface of the cone 4, and the lower end is held by the protrusion 6. In this way, the sound absorbing member 5 is installed in the cone 4. The inner diameter of the protrusion 6 is smaller than the outer diameter of the sound absorbing member 5.

  The solidification processing method of radioactive solid waste using the solidification processing apparatus 10 is demonstrated. The hood 13 is lowered by the elevator described above and covers the upper portion of the drum 20 filled with a predetermined amount of radioactive solid waste 21. This is to prevent the mortar 19 injected into the drum 20 from scattering around the drum 20. Although only a part of the radioactive solid waste 21 is shown in FIG. 2, a predetermined amount of the radioactive solid waste 21 is stacked from the bottom of the drum 20. Sand, cement and water as raw materials for the mortar 19 are supplied into the kneader 11. These raw materials are kneaded by the kneader 11 to produce a mortar 19. The mortar 19 generated by the kneading machine 11 is supplied to the mortar injection pipe 14 through the pipe 16 by the pump 17 and is injected into the drum 20 covered with the hood 13. The mortar 19 enters the gap between the radioactive solid wastes 21 in the drum 20 and is filled to a set level. Before and after the injection of the mortar 19 into the drum 20 by the mortar injection tube 14, vibration by the vibrator 15 is applied to the mortar injection tube 15, and the mortar remaining in the mortar injection tube 15 is discharged by dropping. It is done. By using the vibrator 15, the remaining mortar can be discharged without washing the inside of the mortar injection pipe 15 with water. For this reason, the generation amount of radioactive waste water generated in the radioactive management area can be suppressed. After the injection of the mortar 19 is completed, the vibrator 15 is stopped.

  The liquid level 22 of the mortar 19 in the drum 20 is measured by the ultrasonic level meter 1 attached to the hood 13. The ultrasonic wave 8 is transmitted from the piezoelectric vibrator 2 toward the liquid surface 22. The ultrasonic wave 8 reaches the liquid level 22 through the opening 24 of the cone 4 and is reflected by the liquid level 22. The reflected ultrasonic wave 8 is received by the piezoelectric vibrator 2, and this received signal is transmitted to the control device 18 via the cable 9. The control device 18 calculates the distance from the piezoelectric vibrator 2 to the liquid level based on the input reception signal. When the calculated distance reaches the set distance, that is, when the liquid level 22 reaches the set level, the control device 18 stops the kneader 11 and the pump 17 and stops the injection of the mortar 19 into the drum 20. Is done.

  Thus, the operation of injecting the mortar 19 into the drum 20 is completed. The hood 13 is removed from the drum 20 filled with the mortar 19, and a new drum 20 into which the mortar 19 is poured is covered with the hood 13. The mortar injection operation as described above is performed on the drum 20. The drum 20 filled with the mortar 19 is moved to another place and cured. The mortar 19 is cured in the drum 20 to fix the radioactive solid waste. The drum 20 sealed with the radioactive solid waste 21 is stored in a storage chamber.

  It is assumed that when the mortar 19 is injected into the drum 20, the mortar 19 scatters and reaches the inner space 8 and adheres to the inner surface of the sound absorbing member 5. The sound-absorbing member 5 is hydrophilic and has a large number of continuous bubbles that are open on the surface and communicated with each other, and therefore absorbs moisture contained in the attached mortar 19. Further, the cement and sand solids 25 (see FIG. 1) contained in the adhered mortar 19 enter the pores (continuous bubbles) inside the sound absorbing member 5 as the moisture is absorbed. It is stored in the hole. In the present embodiment, even if the mortar 19 scattered on the inner surface of the sound absorbing member 5 adheres, the moisture and the solid content 25 contained in the mortar 19 are stored in the continuous bubbles in the sound absorbing member 5. A large amount of moisture and solid content 25 does not remain on the inner surface of 5, and formation of large protrusions due to the solid content 25 on the inner surface is suppressed.

  When the sound absorbing member 5 cannot absorb the solid content 25 inside due to long-term use and reaches the end of its life, the sound absorbing member 5 is replaced with a new sound absorbing member 5. At the time of this replacement, the sound absorbing member 5 that has reached the end of its life is taken out from the opening portion 24 to the outside of the cone 4 by a worker using a tool such as pliers. Thereafter, a new sound absorbing member 5 is installed in the cone 4 as described above. The replacement of the sound absorbing member 5 is performed as described above.

  In this embodiment, since the hydrophilic, open-cell sound-absorbing member 5 is disposed inside the cone 4 of the ultrasonic level meter 1, the mortar 19 scattered on the surface of the sound-absorbing member 5 is attached. However, the moisture and the solid content 25 contained in the mortar 19 can be absorbed into the sound absorbing member 5 as described above. For this reason, the ultrasonic level meter 1 does not leave the adhered mortar 19 on the surface of the sound absorbing member 5, so that not only the water but also the solid content adhered to the water-absorbing film, which was a problem in JP-A-10-206213. The generation of ultrasonic reflected signals due to is suppressed. The ultrasonic level meter 1 can remarkably suppress the output of an error signal due to the reflected signal, and the level of the liquid level 22 of the mortar 19 in the drum 20 can be accurately determined when the mortar 19 is injected into the drum 20. It can be measured.

  An ultrasonic level meter described in JP-A-10-206213 and JP-A-2005-127722 is used as a level meter 35 in a radioactive waste solidification processing apparatus described in JP-A-2000-75096, for example. When used in place of, the following problems arise. That is, the protrusion is formed by the water-absorbing film provided on the inner surface of the cone and the solid content of the mortar attached to the inner surface of the sound-absorbing member. It is necessary to frequently clean the inside of the cone. This cleaning is performed by stopping the injection of mortar into the drum, but at this time, a defective solidified body that cannot be buried is generated. In addition, since the work is performed in a high radiation dose radiation control area where the radioactive waste solidification processing apparatus is placed, the burden on workers such as an increase in exposure dose increases.

  On the other hand, in the ultrasonic level meter 1 of the present embodiment, not only the moisture contained in the mortar 19 but also the solid content 25 is accommodated in a large number of continuous bubbles in the sound absorbing member 5, and the probability of occurrence of an error signal is increased. Since it is remarkably reduced, solids adhering to the inner surface of the cone generated when the ultrasonic level meters described in JP-A-10-206213 and JP-A-2005-127722 are applied to a solidification processing apparatus for radioactive waste, respectively. The number of minutes of washing is also significantly reduced. Further, in this embodiment, since the sound absorbing member 5 can be used for a long period of time, the frequency of replacement of the sound absorbing member 5 that has reached the end of its life due to a decrease in the absorption performance of the solid content 25 can be reduced. From the above, the exposure dose of workers can be reduced by reducing the number of times the cone is cleaned in the radiation control area. The reduction in the replacement frequency of the sound absorbing member 5 reduces the amount of the sound absorbing member 5 that becomes radioactive solid waste.

  In this embodiment, since the sound absorbing member 5 is not bonded to the cone 5, the sound absorbing member 5 that has reached the end of its life can be easily and quickly removed from the cone 5 using a tool as described above. In addition, as described above, the new sound absorbing member 5 can be attached to the cone 4 easily and in a short time. Since the time required for replacing such a sound absorbing member 5 is short, the exposure dose of the worker can be further reduced.

  The vibration applied to the mortar injection tube 14 by the vibrator 15 is also transmitted to the ultrasonic level meter 1 through the above-described gantry and hood 13. Since the ultrasonic level meter 1 supports the sound absorbing member 5 by the projection 6 which is a part of the cone 4 projecting inward from the cone 4 instead of the screw, the ultrasonic level meter 1 can be detached by vibration of the vibrator like a screw. And the sound absorbing member 5 can be reliably held.

  An ultrasonic level meter according to embodiment 2, which is another embodiment of the present invention, will be described with reference to FIG. The ultrasonic level meter 1 </ b> A according to the present embodiment has a configuration in which a support cap 26 is attached to the lower end portion of the cone 4 instead of the protrusion 6 in the ultrasonic level meter 1. The support cap 26 meshes with a screw formed at the lower end portion of the outer surface of the cone 4.

  The ultrasonic level meter 1 </ b> A is attached to the hood of the radioactive waste solidification processing apparatus instead of the ultrasonic level meter 1. When the solidification processing apparatus 10 performs water washing in the mortar injection pipe in the solidification processing apparatus 10 described above, there is no need to worry about the residual mortar remaining after the mortar injection is completed, and no vibrator is required. When the ultrasonic level meter 1 is applied to the solidification processing apparatus 10, the mass of the cone 4 is reduced in order to reduce the load on the head unit 1 when vibration by the vibrator 15 is applied to the head unit 3 of the ultrasonic level meter 1. Need to be small. However, when the support cap 26 is employed in the ultrasonic level meter 1, it is necessary to increase the thickness of the cone 4 in order to cut the screw on the outer surface, and when the mass of the cone 4 increases and vibration is applied. The load applied to the head unit 1 is increased. Due to the increase in the mass of the cone 4 and the removal of the support cap due to vibration, the support cap 26 could not be employed in the ultrasonic level meter 1.

  In the radioactive waste solidification processing apparatus to which the ultrasonic level meter 1A is applied, vibration is not applied to the head unit 1, and therefore the mass of the cone 4 can be increased. Therefore, the support cap 26 can be engaged with the screw formed on the outer surface of the cone 4. The sound absorbing member 5 inserted into the cone 4 is supported by a support cap 26. Since the vibration applied by the vibrator 15 is not transmitted to the ultrasonic level meter 1A, the support cap 26 does not fall off the cone 4 due to the vibration.

  Since the ultrasonic level meter 1A of the present embodiment can support the sound absorbing member 5 by the detachable support cap 26, the sound absorbing member 5 having no elasticity can be used. As an example of the sound absorbing member 5 that does not have elasticity, there is a rigid polyurethane foam that is hydrophilic and has open cell properties. As another example, there is a sound-absorbing member made of a material having high hardness among the hydrophilic open-cell materials (for example, polyurethane, polyolefin, foamed silicon, foamed rubber and the like) described in the first embodiment.

  Since the ultrasonic level meter 1A of the present embodiment uses the sound absorbing member 5 as in the first embodiment, the level of the liquid level 22 of the mortar 19 in the drum 20 when the mortar 19 is injected into the drum 20. Can be measured with high accuracy. Further, the radioactive waste solidification processing apparatus to which the ultrasonic level meter 1A is attached can obtain the same effects as those produced by the solidification processing apparatus 10 described in the first embodiment.

  Ultrasonic level meters 1 and 1A are not only for radioactive waste solidification treatment equipment, but also for equipment (such as used resin tanks) that need to measure the liquid level containing solids in the radiation control area. Is also applicable.

It is a longitudinal cross-sectional view of the ultrasonic level meter of Example 1 which is one suitable Example of this invention. It is a block diagram of the solidification processing apparatus of the radioactive waste to which the ultrasonic level meter shown in FIG. 1 is applied. It is explanatory drawing which shows the state at the time of the attachment of the sound absorption member in the ultrasonic level meter shown in FIG. It is a longitudinal cross-sectional view of the ultrasonic level meter of Example 2 which is another Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A ... Ultrasonic level meter, 2 ... Piezoelectric vibrator, 3 ... Head part, 4 ... Cone, 5 ... Sound absorption member, 6 ... Projection part, 8 ... Ultrasonic wave, 10 ... Solidification processing apparatus of radioactive waste, 11 DESCRIPTION OF SYMBOLS ... Kneading machine, 12 ... Mortar injection device, 13 ... Hood, 14 ... Mortar injection pipe, 15 ... Vibrator, 17 ... Pump, 18 ... Control device, 19 ... Mortar, 20 ... Drum can, 21 ... Radioactive solid waste, 22 ... Liquid surface.

Claims (4)

  Surrounded by the cylindrical body, a head part, a cylindrical body attached to the head part, a hydrophilic and open-cell sound-absorbing member detachably mounted inside the cylindrical body, and the cylindrical body An ultrasonic level meter, comprising: a vibrator that faces the space and is provided on the head for transmitting and receiving ultrasonic waves.   The ultrasonic level meter according to claim 1, wherein the cylindrical body includes support means for supporting the sound absorbing member. A kneading apparatus for kneading mortar, a cover member for covering the upper part of the waste storage container filled with radioactive waste, and the mortar attached to the cover member and obtained by the kneading apparatus in the waste storage container A solidifying material injecting device having a solidifying material injection tube for injecting into, and an ultrasonic level meter attached to the cover member,
The ultrasonic level meter has a head portion attached to the cover member, a cylindrical body attached to the head portion, and a hydrophilic and open-cell property detachably attached to the inside of the cylindrical body. A solidification processing apparatus for radioactive waste, comprising: a sound absorbing member; and a vibrator for transmitting and receiving ultrasonic waves provided in the head so as to face a space surrounded by the cylindrical body.   The radioactive waste solidification processing apparatus according to claim 3, wherein the cylindrical body includes support means for supporting the sound absorbing member.

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