JP2007078580A - Sampling device of incinerated ash from radioactive waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sampling device of incinerated ash from radioactive waste capable of collecting an analysis sample without scattering the incinerated ash from radioactive waste. <P>SOLUTION: A sealed chamber 6 having a hopper-shaped bottom part 5 is disposed on the outside of the side face 4 of an incinerated ash recovery passage 1, and a sample storage container 7 storing the analysis sample is provided on the bottom part 5. A sampling arm 9 for advancing into the incinerated ash recovery passage 1, collecting the dropping incinerated ash, retreating into the sealed chamber 6, and storing the collected incinerated ash into the sample storage container 7 is disposed in the sealed chamber 6. The sampling arm 9 is equipped with a sampling container 12 on an approximately middle part of a horizontal shaft 11, and can collect the incinerated ash by facing the sampling container 12 upward, and can drop the incinerated ash into the sample storage container 7 by facing the sampling container 12 downward. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sampling apparatus for radioactive waste incineration ash for collecting a sample for analysis from the incineration ash of radioactive waste.

  Radioactive combustible waste generated from a nuclear power plant or the like is introduced into an incinerator space of an incinerator by a dosing machine, as shown in Patent Document 1, for example. This combustible waste is supplied with air and hot air and burned, and the waste becomes incinerated ash and accumulates at the bottom of the furnace. The ash collected at the bottom of the furnace is cooled in an ash storage chamber, then filled into an incinerated ash storage container in a sealed space, and then stored for a long time.

As described above, conventionally, incineration ash containing radioactive materials has been filled directly into an incineration ash storage container in a sealed space, so it is extremely difficult to collect a sample for analyzing incineration ash constituents. there were. Therefore, when collecting a sample for analysis, the sealed storage container must be opened, which may cause incineration ash containing a low level of radioactive material to scatter.
JP-A-5-71719 (FIG. 1)

  An object of the present invention is to provide a sampling apparatus for radioactive waste incineration ash that solves the above-described conventional problems and can collect a sample for analysis without scattering the incineration ash of radioactive waste. .

The sampling device for radioactive waste incineration ash according to the present invention made to solve the above problems,
A sealed chamber disposed on the outer side of the incineration ash collection passage where radioactive waste incineration ash falls;
A sample storage container held in a fitted state at the bottom of the sealed chamber;
A radioactive waste incineration ash sampling device comprising a sampling arm disposed on a side surface of the sealed chamber,
The sampling arm advances into the incineration ash collection passage and collects the radioactive waste incineration ash, and then retracts the incineration ash collection passage and stores the collected radioactive waste incineration ash in a sample storage container. To do.

The sampling arm is a horizontal shaft provided with the sampling container in a substantially middle part,
One end of the horizontal shaft penetrates to the outside of the sealed chamber, and the outer tip thereof has a handle for rotating the horizontal shaft about its axis to turn the sampling container upside down,
A pair of positions for sandwiching the sampling container on the axis of the horizontal shaft at a predetermined interval to contact the side wall of the incineration ash recovery passage to regulate the advancement and retreat of the horizontal shaft and position the sampling container. And have a flange of
Furthermore, the sampling device for the radioactive waste incineration ash can be disposed in a glove box that covers the incineration ash collection passage.

  In the radioactive waste incineration ash sampling apparatus according to the present invention, a sealed chamber is provided on the outer side surface of the incineration ash recovery passage, and a sampling arm that can be moved back and forth is provided in the sealed chamber. Samples for analysis can be collected by collecting the incinerated ash that has been dropped by advancing to, and then retracting this arm into the sealed chamber and turning it upside down. Therefore, there is no risk of incineration ash being scattered during sampling.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a recovery portion of incineration ash discharged from a radioactive waste incinerator, wherein 1 is an incineration ash recovery passage through which the incineration ash of radioactive waste falls and communicates with an upper incinerator; A damper box for supplying a predetermined amount of ash accumulated in the lower part of the incineration ash collection passage 1 downward, and 3 an incineration ash storage container for storing the incineration ash supplied from the damper box 2.

  In FIG. 1, a sealed chamber 6 having a bottom portion 5 formed in a hopper shape is disposed outside the side surface 4 of the incineration ash collection passage 1, and a sample for incineration ash analysis is stored in the bottom portion 5. A sample storage container 7 is held in a mated state. The sample storage container 7 is stored in a bag 8 made of vinyl or the like in order to replace the sample storage container 7 by a bag-in-bag-out method without scattering incineration ash.

The sealed chamber 6 is provided with a sampling arm 9 for entering the incineration ash collection passage 1 and receiving the incineration ash that is falling. Details of the sampling arm 9 are shown in FIGS.
The sampling arm 9 includes a sampling container 12 in the middle of the horizontal shaft 11. The sampling container 12 passes through the insertion hole 10 provided in the side surface 4 and collects the sealed chamber 6 and the incinerated ash. It can move forward and backward between the passage 1. A pair of flanges 13 and 14 for positioning the sampling container 12 in contact with the side surface 4 of the incineration ash recovery passage 1 are located at a predetermined interval at a position sandwiching the sampling container 12 on the axis of the horizontal shaft 11. Is provided.

  One end of the horizontal shaft 11 opposite to the side on which the sampling container 12 is provided penetrates the outside of the sealed chamber 6, and a handle 15 for rotating and advancing and retreating the horizontal shaft 11 is attached to the tip of the horizontal shaft 11. The mounting member 33 is mounted. The handle 15 is angle-adjusted so that the sampling container 12 faces upward when it is rotated upward.

  A sealing structure 19 that prevents leakage of incinerated ash is provided on the side wall 16 of the sealed chamber 6 through which the horizontal shaft 11 passes from the sealed chamber 6. In the seal structure 19, as shown in FIG. 5, the mounting substrate 20 is joined to the side wall 16 of the sealed chamber 6 by welding or the like. The flange 40 joined to the shaft holder 25 and the mounting substrate 20 are fastened by bolts 26 via the gasket 24.

  Inside the mounting substrate 20 and the shaft holder 25, a brush 17 and a bush 31 for disposing incineration ash adhering to the horizontal shaft 11 are disposed, and an oil seal 32 is provided at the end of the shaft holder 25. It has been subjected. Further, a bellows 18 is provided between the shaft holder 25 and the handle mounting member 33 so as to cover the horizontal shaft 11 so as to prevent incineration ash from leaking out.

  The brush 17 is fixed by a brush presser 27 fastened by a bolt 28. A stopper plate 29 with which the flange 13 abuts when the horizontal shaft 11 is retracted is attached to the brush retainer 27 with screws 30.

  It is desirable to provide a lock mechanism 34 as shown in FIGS. 6 and 7 between the stopper plate 29 and the flange 13. The lock mechanism 34 is provided at two locations facing the center of the horizontal shaft 11, and includes a protrusion 35 provided on the flat surface of the stopper plate 29 and an overhang portion protruding in a Γ shape on the outer edge of the stopper plate 29. 36 and projecting pieces 37 projecting radially from the outer periphery of the flange 13.

  That is, when the horizontal shaft 11 moves backward after the sample is collected and the flange 13 comes into contact with the stopper plate 29, when the handle 15 is rotated downward from above, the projecting piece 37 collides with the projection 35 and the rotation is caused. While being stopped, the protruding piece 37 is also sunk into the overhang portion 36. Therefore, since the movement of the protruding piece 37 in the lateral direction is restricted by the overhang portion 36, the horizontal shaft 11 cannot move in the direction of the incineration ash collection passage 1 unless the handle 15 is rotated. Since the handle 15 is positioned vertically below the horizontal shaft 11, the handle 15 is positioned by gravity and can securely lock the sampling arm 9.

  In sampling the incineration ash in the sampling apparatus configured as described above, as shown in FIG. 2, the handle 15 is operated and the horizontal shaft 11 is rotated so that the opening of the sampling container 12 faces upward as shown in FIG. Insert into passage 1. At this time, since the flange 13 contacts the side wall 4 of the incineration ash collection passage 1, the sampling container 12 can be set at a predetermined position. When the incineration ash is collected, the sampling container 12 is retracted into the sealed chamber 6, and after the flange 13 comes into contact with the stopper plate 29 and the flange 14 comes into contact with the side surface 4 and stops, as shown in FIG. The sampling container 12 is inverted. In this way, the incineration ash can be stored in the sample storage container 7 from the hopper-shaped bottom 5 and the sampling arm 9 can be locked by the lock mechanism 34. Thereafter, by exchanging the sample storage container 7 by the bag-in-bag-out method, the sample for analysis can be collected without scattering the incineration ash.

  The sampling device described above can be used when the incineration ash does not emit alpha rays. However, if the incineration ash is likely to emit alpha rays, the entire equipment is inside the glove box, so the sampling device can take the following embodiments.

  A sampling device arranged in the glove box 21 is shown in FIGS. In the figure, the incineration ash collection passage 1 communicates with a lower horizontal passage 41, and the incineration ash is horizontally moved by an incineration ash conveyor (not shown) provided in the horizontal passage 41 to be incinerated ash below. It is stored in the storage container 3. The glove box 21 is provided with several gloves 22. The sampling device is not greatly different from the above-described one in that it comprises a sealed chamber 6 provided with a sample storage container 7 at the bottom 5 and a sampling arm 9 provided through the sealed chamber 6. In order to easily perform the operation with the globe 22, two long auxiliary handles 23 are provided orthogonal to the handle 15.

  That is, a hand is inserted into the glove 22 of the glove box 21 and the handle 15 is operated via the auxiliary handle 23 to insert into the incinerated ash collection passage 1 with the opening of the sampling container 12 facing upward and perform sampling. When the sampling is completed, the incinerated ash can be stored in the sample storage container 7 by retracting the sampling container 12 into the sealed chamber 6 and inverting it upside down. Thereafter, by exchanging the sample storage container 7, the incineration ash can be sampled without being scattered outside the glove box 21.

As described above, in the sampling apparatus for radioactive waste incineration ash according to the present invention, the sampling arm is disposed in the sealed chamber disposed on the outer side surface of the incineration ash recovery passage. Therefore, the sampling arm is operated. Thus, the incineration ash can be sampled in the middle of the incineration ash collection passage.
Therefore, it does not require the work of opening and sampling the incineration ash storage container in which the incineration ash is sealed as in the prior art, so there is no fear that the incineration ash is scattered, and there is a great advantage that the work is simple. .

It is a front view of the collection part of incineration ash. It is a front view of the sampling device in the state where the sampling arm has advanced into the incineration ash collection passage. It is a front view of the sampling apparatus which is in the state where the sampling arm retracted into the sealed chamber. (A) Side view of a sampling container, (b) It is an enlarged view of the front of a sampling container part. It is an enlarged view of a seal structure. It is a front view of a lock mechanism. It is a side view of a locking mechanism. It is a front view of the sampling apparatus arrange | positioned in the glove box. It is an enlarged view of the sampling apparatus shown in FIG.

Explanation of symbols

1 incineration ash collection passage, 2 damper box, 3 incineration ash storage container, 4 side of incineration ash collection passage, 5 bottom, 6 sealed chamber, 7 sample storage container, 8 bag, 9 sampling arm, 11 horizontal shaft, 12 sampling Container, 13 Flange, 14 Flange, 15 Handle, 16 Side wall of sealed chamber, 17 Brush, 18 Bellows, 19 Seal structure, 20 Mounting board, 21 Glove box, 22 Glove, 24 Gasket, 25 Shaft holder, 26 Bolt, 27 Bra Presser foot, 28 Bolt, 29 Stopper plate, 30 Screw, 31 Bush, 32 Oil seal, 33 Handle mounting member, 34 Lock mechanism, 35 Protrusion, 36 Overhang part, 37 Protruding piece, 40 collar part, 41 Horizontal passage

Claims (3)

A sealed chamber disposed on the outer side of the incineration ash collection passage where radioactive waste incineration ash falls;
A sample storage container held in a fitted state at the bottom of the sealed chamber;
A radioactive waste incineration ash sampling device comprising a sampling arm disposed on a side surface of the sealed chamber,
The sampling arm advances into the incineration ash collection passage and collects the radioactive waste incineration ash, and then retracts the incineration ash collection passage and stores the collected radioactive waste incineration ash in a sample storage container. Radioactive waste incineration ash sampling device. The sampling arm is a horizontal shaft provided with the sampling container in a substantially middle part,
One end of the horizontal shaft penetrates to the outside of the sealed chamber, and the outer tip thereof has a handle for rotating the horizontal shaft about its axis to turn the sampling container upside down,
A pair of positions for sandwiching the sampling container on the axis of the horizontal shaft at a predetermined interval to contact the side wall of the incineration ash recovery passage to regulate the advancement and retreat of the horizontal shaft and position the sampling container. The radioactive waste incineration ash sampling apparatus according to claim 1, wherein the sampling apparatus has a flange. 3. The radioactive waste incineration ash sampling apparatus according to claim 1, wherein the radioactive waste incineration ash sampling apparatus is disposed in a glove box that covers the incineration ash collection passage.

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