JPS589100A - Method of making radioactive waste solidified with resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a resin assimilate of radioactive waste.

In general, radioactive waste generated from nuclear power generation facilities, etc. is subjected to various geological processes, and is finally permanently contained in a solidified body and disposed of by dumping in the ocean. Conventionally, the solidified material of ζ is a so-called solidified cement, which is made by mixing radioactive waste into cement and solidified, or a solidified asphalt, which is made by mixing radioactive waste into asphalt and hardened. Recently, so-called resin assimilates, which are made by mixing radioactive waste into resin and solidifying it, are being developed.
Resin assimilates like Jin have the advantage of having a great ability to contain radioactive waste, and are also excellent at reducing the volume of radioactive waste. Conventionally, in order to produce such a solidified resin, radioactive waste is first mixed into an uncured thermosetting resin, then a polymerization initiator and a polymerization accelerator catalyst are added to the ζ layer. This is filled into a can-type container and allowed to polymerize and harden at room temperature.9.

By the way, books like ζ ignore the containment capacity of the container mentioned above and are designed to obtain the necessary containment capacity only from the containment capacity of the assimilate itself. ζ, emphasis is placed on the strength of the resin assimilate, especially the strength of its surface parts, for example its Table 11O strength must be ensured to withstand the pressure of 15Ok#la7, in this case the above *
If a is an IF closed type O and a thermosetting resin mixed with radioactive waste is filled into this container, the thermosetting resin will harden and it will no longer be possible to inspect the strength of its surface. For this purpose, the lid of a container (for example, a drum can) is removed, the thermosetting resin mixed with radioactive waste is filled, the ζO thermosetting resin is cured while the lid is removed, and the surface of the thermosetting resin is cured after curing is completed. Strong ml! One idea was to measure the strength of the drum to ensure its strength, then attach a lid to the drum and fill the gap between the thermosetting resin OS surface and the lid with a filler. However, in the case of ζO, the surface of the thermosetting resin comes into contact with air, so the thermosetting resin O1! Face part 01! development is delayed. Due to this rounding, the volume of the core changes as the thermosetting resin in the center hardens.
*KoIl! ! The surface may be locally depressed or bulged. If the surface portion is deformed before the curing is completed, the strength of the surface portion may be reduced.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to create a radioactive waste material that can complete the curing of thermosetting resin without reducing the strength of the surface portion. ! The object of the present invention is to obtain a method for producing an iI compound.

The present invention will be explained below based on one embodiment.

First, as shown in Figure 1, radioactive waste 2 is mixed into uncured O thermosetting resin L, catalysts such as polymerization initiators and polymerization accelerators are added, and the core is filled into a container J such as a drum. do. In this case, the container @I is opened at the upper end, so that the free surface of the thermosetting resin I is exposed to the outside.Then, this container jt is collected in a curing i14 as shown in FIG. The curing chamber 4 is completely isolated from the outside air and is configured so that a non-oxidizing gas such as nitrogen or an inert gas can flow inside the curing chamber 4. The inside of this curing wi4 is maintained at a high temperature, for example, 30° C. or higher, by a heating mechanism (not shown), and is also configured to be heated by a high-frequency heating device jFc that heats the container J.

Then, the temperature inside the curing chamber 4 and the temperature IIL of the container 1 are determined.
The temperature is detected by #i temperature detection @#, 7, and the signal from these temperature detection @g, y is sent to a control device a for temperature control and monitoring. is stored in the grain curing chamber 4 for a certain period of time, and the thermosetting resin is cured to form a solidified grain that is integrated with the grain I11. In this case, since the non-oxidizing atmosphere inside the curing chamber 4 is represented by, for example, a nitrogen gas atmosphere,
Without any oxygen contact with the free surface of the thermosetting resin, this self! Curing in the vicinity of the surface of the thermosetting resin does not occur at the same rate; therefore, the O curing progresses equally in the surface area and inside the thermosetting resin. Therefore, even if hardening progresses and the internal volume increases, at this point the hardening has already progressed near the surface, so there will be no local deformation t5 in the vicinity of the surface, which will prevent the strength of the surface area from decreasing. The inside of the curing container 4 is maintained at a high temperature, and the large container 1 itself is also heated, so the thermosetting resin 10
Since the O curing near the surface is further promoted, localized tablet formation near the surface is more effectively prevented. After curing is completed, the container 1 is taken out from the curing 114 and the strength and condition of the free surface are inspected to ensure the quality of the resin assimilate J. Then, as shown in FIG. 3, the lid 1# is attached to the container 1, and the solidified resin is poured from the filling port 11 provided in the lid 1#. A filler material 12 similar to cement mortar is filled into the gap between the top surface and the lid body 10.

Note that the present invention is not limited to the above-mentioned embodiment. For example, the inside of the curing house does not necessarily have to be in a high-temperature atmosphere.

In addition, the gas flowing in the curing chamber is not necessarily nitrogen,
The gas is not limited to an inert gas, but any non-oxidizing gas that does not inhibit the curing of the thermosetting resin may be used.

As described above, the radioactive waste of the present invention is mixed into an uncured thermosetting resin, and the thermosetting resin is cured in a non-oxidizing atmosphere. Therefore, there is no delay in the curing of the thermosetting resin near the surface, and there is no possibility that the areas near the surface will be deformed during curing due to changes in volume, resulting in a decrease in strength.

[Brief explanation of the drawing]

The figures are diagrams illustrating the steps of an embodiment of the present invention, in which Figure 1 is a vertical cross-sectional view of a container filled with uncured thermosetting resin, and Figure 2 is a vertical cross-sectional view of a container filled with uncured thermosetting resin. FIG. 3 is a vertical cross-sectional view of the container with the lid attached. 1-thermosetting resin, 2.-radioactive waste, 1-container, 4
-Curing room, 1#-Lid body, 12-Filling material/Applicant's representative
Patent Attorney Takehiko Suzue Figure 1 Figure 31 9 No. 1 ゝ-2 3

Claims (2)

[Claims] (1) It is characterized by comprising a process for mixing radioactive waste into an uncured thermosetting resin, and a process for curing the thermosetting resin mixed with the radioactive waste in a non-oxidizing atmosphere. A method for producing a radioactive waste O resin garden. (2) A patented method for producing a solidified O resin, characterized in that when the radioactive waste is mixed and the thermosetting resin is cured in a non-oxidizing atmosphere, the thermosetting resin is heated from the outside.