JPH081485Y2 - Equipment for measuring the amount of corrosion of radioactive waste - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a device for measuring the amount of corrosion of radioactive waste.

“Prior Art” Generally, high-level radioactive waste generated in a nuclear power plant or the like can be improved in handleability by vitrification treatment, for example.

The so-called solidified package that has been subjected to a process such as vitrification is planned to be stored for a long time in a radioactive waste storage as shown in FIG.

In FIG. 3, reference symbol P indicates radioactive waste such as a solidified package obtained by subjecting high-level radioactive waste to vitrification, etc., 1 is a cell chamber for storing a large number of radioactive waste P, and 2 is a cell chamber. A concrete wall surrounding the cell chamber 1, 3 is a transfer chamber provided above the cell chamber 1, 4 is a ceiling slab made of a concrete wall separating the cell chamber 1 and the transfer chamber 3, and 5 is a ceiling slab 4. A storage pipe such as a steel pipe for holding a plurality of radioactive wastes P in a vertically stacked state, 6 is a support structure (support frame) horizontally installed in the cell chamber 1, and 7 is a support structure. An outer pipe which is supported by 6 and surrounds the housing pipe 5, 8 is an outside air inlet, 9 is an air outlet, 10 is a cooling air insertion passage, and 11 is a closing lid for sealing the upper part of the housing pipe 5.

In the storage having such a structure, when the temperature of the storage tube 5 rises due to the decay heat of the radioactive material, convection occurs in which the air in the cylindrical space 12 between the solidified package storage tube 5 and the outer tube 7 rises. As shown by the arrow in FIG. 3, cooling is performed by the air taken in from the cooling air insertion passage 10, and the heated air is discharged from the air outlet 9. Therefore, cooling is performed by natural convection during a period in which decay heat is generated without requiring a power source, and high safety is ensured without being affected by a power failure or the like.

[Problems to be Solved by the Invention] However, in the conventional storage, it is important to estimate the life (corrosion amount) of the storage facility structural material in a facility that stores the vitrified material for a long time.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a device for measuring the amount of corrosion of radioactive waste, which can directly and reliably grasp the life of a storage facility structural material or the like. .

[Means for Solving the Problem] The corrosion amount measuring device of the present invention is provided with an inlet and an exhaust for inserting cooling air into a part of a solidified package storage pipe arranged in a plurality of radioactive waste storages. It is a corrosion amount measuring device for measuring the corrosion amount of the package, which is stored in the solidified package storage pipe with the inlet and the exhaust port formed in the lower part and the upper part in place of the solidified package. A container having a shape similar to that of the package and having vertically formed through holes for circulating cooling air, and a sample supported in a suspended state by a support in the container. It adopts the technology equipped with.

[Operation] When the corrosion amount measuring device is stored in the storage pipe, an ascending air flow is generated in the storage pipe of the cell chamber based on the heat generated by the stored solidification package.
By inserting the inside of the solidified package storage tube in which the introduction port and the exhaust port are formed, the air flow is introduced into the interior through the circulation hole of the container and comes into contact with the sample. Then, the amount of corrosion is measured by taking out the specimen at any time.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

The radioactive waste corrosion amount measuring device 20 of the present embodiment is the first
As shown in the figure, a container 21 formed in a shape similar to the solidified package (radioactive waste) P (a modeled shape of the solidified package P) and a horizontal space in the container 21 with a vertical space between them. It is configured to include a plurality of supports 22 erected on the base and a sample 23 suspended from the supports 22. The sample 23 is formed of a material that corrodes faster than the outer wall of the solidified package P.

Circulation holes 21a, 21b for circulating the outside air passing through the storage tube 5 are formed in the upper part and the lower part of the container 21.

Next, an example of use of the radioactive waste corrosion amount measuring apparatus 20 of the present embodiment will be described with reference to FIG. The corrosion amount measuring device 20 is stored in a storage pipe of a radioactive waste storage for use. This storage contains a plurality of solidified package storage pipes 5 for storing a solidified package P obtained by solidifying high-level waste, and these solidified package storage pipes 5.
The cell chamber 2 in which is arranged, and the outside air inlet 8 for introducing outside air to the lower portion of the cell chamber 2 are provided as a schematic configuration. In the solidified package storage pipe 5 on the left side of the figure among the solidified package storage pipes 5, an introduction port 15a that opens to the cooling air insertion passage 10 is formed in the lower portion, and the solidification package storage pipe 5 is introduced from this introduction port 15a. An exhaust port 15b is formed in the upper part for discharging outside air after it has been inserted into the solidified package housing pipe 5.

The corrosion amount measuring device 20 is housed in the solidified package housing pipe 5.

The apparatus for measuring the amount of corrosion of radioactive waste according to the present embodiment is used in a state in which the apparatus for measuring the amount of corrosion 20 provided with the sample 23 is housed in the housing pipe 5. At this time, the outside air is introduced into the container 21 of the corrosion amount measuring device 20 through the flow hole 22b formed in the lower part thereof and discharged from the flow hole 22a formed in the upper part.

Then, the specimen 23 is placed in the storage under the same conditions as the other solidified packages P, and the amount of corrosion thereof is measured at any time.

If the corrosion amount measuring device 20 of the present embodiment is used, the long-term corrosion amount of the storage facility can be measured under the conditions of the actual environment, so that it is possible to directly and reliably measure the corrosion amount. You can Then, the amount of corrosion of the storage equipment is always clear, and its long-term soundness can be confirmed.

Further, the corrosion amount measuring device 20 of the present embodiment can be handled in the same manner as other solidified packages P, and is therefore easy to use. Also, in the storage facility, another solidified package P
Can be given the same conditions as.

It should be noted that the embodiment of the present invention is not limited to the above-mentioned embodiment, and other modifications are possible.

“Effect of device” As described above, the radioactive waste corrosion amount measuring device according to the present invention makes it possible to measure a long-term corrosion amount of a storage facility under actual environment conditions. A direct and reliable corrosion amount measurement can be performed. Then, the amount of corrosion of the storage equipment is always clear, and its long-term soundness can be confirmed.

Further, since it can be handled in the same manner as a package, it has excellent effects such as ease of use.

[Brief description of drawings]

1 and 2 show one embodiment of the apparatus for measuring the amount of radioactive waste according to the present invention. FIG. 1 is a front sectional view of the apparatus for measuring the amount of corrosion, and FIG. FIG. 3 is a front cross-sectional view of a main part of a radioactive waste storage containing the corrosion amount measuring device, and FIG. 3 is a front cross-sectional view showing a conventional example of the radioactive waste storage. P ... Solidified package, 1 ... Cell room, 2 ... Concrete wall, 3 ... Transport room, 4 ... Ceiling slab, 5 ... Solidified package storage tube, 6 ... Support structure, 7 ... Outer tube , 8
…… Outside air inlet, 9 …… Air outlet, 10 …… Cooling air insertion passage, 11 …… Closing lid, 12 …… Cylinder space, 20 …… Corrosion amount measuring device, 21 …… Container, 21a, 21b …… Circulation hole, 22 ... Supporting tool, 23 ... Specimen

Claims (1)

[Scope of utility model registration request] 1. An inlet (15a) and an outlet (15b) for inserting cooling air into a lower part of a part of a solidified package storage pipe (5) arranged in a radioactive waste storage, and a lower part of the solidified package storage pipe (5). Corrosion amount measuring device (20) for measuring the corrosion amount of the package, which is housed in the solidified package storage pipe formed in the upper part with the introduction port and the exhaust port formed in place of the solidified package (P). A container (21) having a shape similar to that of the package and having vertically formed through holes (21a, 21b) for circulating cooling air, and a support (22) inside the container (21). ) A test piece (23) supported in a suspended state by (1), and a device for measuring the amount of corrosion of radioactive waste.