JPH02251800A - Treatment system for low level radioactive waste - Google Patents

Abstract

PURPOSE:To enable an effective treatment of low level radioactive wastes by providing a container, a separator plate which is constituted to be able to be slided, a radioactivity counting means, a weighting means, and a calculation means to calculate a radioactivity concentration. CONSTITUTION:A low level radioactive waste 1 to be contained in a container 2, is successively packed in a manner to keep a vertically almost full-packed condition by sliding the separator plate 3, a radiation from the low level radioactive waste 1 container in the container 2, is measured by a radioactivity counting means 4 which is constituted so as to be able to slide with the plate 3 and, at the same time, a weight of the waste 1 in the container 2 is weighed by the weighing means 5 and finally a radioactivity concentration of each container is calculated by the calculating means 6, using those measurement results. By treating in this way, even though in a case that a substantial amount of the waste 1 is generated in a dismantling work and the like, the waste 1 can be effectively treated and therefore a reduction of labor works required for a treatment work and of a storage facility can be realized.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to low-level radioactive waste used for processing low-level radioactive waste generated from facilities handling radioactive materials such as nuclear power plants. Regarding processing systems for things.

(Prior Art) Radioactive waste from each company is generally generated within the controlled area of a facility that handles radioactive materials such as a nuclear power plant. Most of this radioactive waste is low-level radioactive waste with relatively low radioactivity concentration, but such low-level radioactive waste is conventionally stored in drums and stored in storage facilities. has been done.

(Problems to be Solved by the Invention) As mentioned above, conventional low-level radioactive waste is contained in drums and stored in storage facilities, but when processing a relatively large amount of waste, , 200 conventionally (the maximum is done per drum).

Therefore, if a large amount of low-level radioactive waste is generated, for example, due to the demolition of a building, floor, or wall in the controlled area of a radioactive material handling facility, the conventional method would require the number of drums to contain the low-level radioactive waste. The problem arises that measurement, evaluation, management, etc. require a great deal of effort and a vast storage facility is required.

The present invention has been made in response to such conventional circumstances,
Even in cases where a large amount of low-level radioactive waste is generated due to demolition work in the controlled area of a facility handling radioactive materials, it is possible to dispose of the low-level radioactive waste more efficiently than in the past. The present invention aims to provide a low-level radioactive waste processing system that can reduce the labor involved in processing work and the need for storage facilities.

[Structure of the Invention] (Means for Solving the Problems) That is, the low-level radioactive waste processing system of the present invention is provided between a container containing low-level radioactive waste and opposing inner walls of this container. a partition plate configured to be slidable along the inner wall; at least one radiation measuring means configured to be slidable together with the partition plate; comprising a weight measuring means for measuring, and a calculating means for calculating the radioactivity concentration of the low-level radioactive waste contained in the container from the measurement results of the weight measuring means and the measurement results of the radiation measuring means. It is characterized by

(Function) In the low-level radioactive waste treatment system of the present invention having the above configuration, the low-level radioactive waste contained in the container is
The container is successively filled by sliding the partition plate to keep it full in the height direction, and the low-level radioactive waste stored in the container by the radiation n1 constant means configured to be able to slide along with the partition plate. In addition to measuring the radiation from the object, the weight measuring means measures the weight of the low-level radioactive waste in the container, and the calculating means calculates the radioactivity concentration for each container from these 1111 results.

Therefore, it is possible to evaluate the optimal storage period and radioactivity level for each container, and since the measurement container also serves as a storage container, successive radioactivity measurements of waste can be carried out over a long period of time. Measurements can be made and accurate assessments can be made down to extremely low radioactivity levels. Furthermore, it becomes possible to use large-capacity containers and the like.

Therefore, even if a large amount of low-level radioactive waste is generated due to demolition work in the controlled area of a facility handling radioactive materials, it is possible to dispose of the low-level radioactive waste more efficiently than in the past. This makes it possible to reduce the labor involved in processing work and the need for storage facilities.

(Example) Hereinafter, the details of the low-level radioactive waste treatment system of the present invention will be described with reference to the drawings for one example.

FIG. 1 shows the configuration of a low-level radioactive waste processing system according to an embodiment of the present invention. Low-level radioactive waste 1 generated as a result of the demolition of walls, etc. is stored in container 'a2.

This container 2 is configured in the shape of a rectangular parallelepiped, and has a large capacity, for example, on the order of several hundred liters to several kiloliters. Further, one side 93 of the container 2 is configured to be slidable in the longitudinal direction (in the direction of the arrow in the figure) within the container 2 as a partition plate, and this side wall 3 is configured to be slidable together with the side wall 3. A gamma ray detector 4 for measuring gamma rays from inside the container 2 is connected. Note that it is preferable to provide a plurality of γ-ray detectors 4 depending on the size of the container 2.

Furthermore, a weight measuring device (load cell) 5 is provided at the bottom of the container 2, and is configured to be able to measure the weight of the low-level radioactive waste 1 contained in the container 2.

Then, the weight jlIJl constant signal of this weight measuring device 5,
The gamma ray measurement signals from the gamma ray detector 4 are input to a calculation device 6, and this calculation device t6 is configured to calculate the radioactivity concentration of the low-level radioactive waste 1 from these signals.

In the low-level radioactive waste processing system of this embodiment with the above configuration, the side wall 3 is sequentially slid according to the amount of low-level radioactive waste 1 contained in the container 2, and when the container 2 is full. Then, this side wall 3 is fixed to a predetermined end of the container 2. Then, a lid (not shown) is fixed to the upper part of the container 2 to seal the inside of the container 2, and the γ-ray detector 4 is removed from the side wall 3 for transportation and storage. Furthermore, when the inside of the container 2 is full, the calculation device 6 calculates the radioactivity concentration by nuclide in each container 2 from the weight measurement signal from the weight measurement device af5 and the gamma ray measurement signal from the 7-ray detector 4. .

At this time, each time the side wall 3 is slid, if a ball or a thin plate-shaped spacer is inserted to prevent the low-level radioactive waste 1 from collapsing into the newly expanded space, the gamma-ray detector 4 can always be placed in a new container. Maintain a state of high sensitivity to the low-level radioactive waste 1 contained in 2,
Moreover, since the radioactivity concentration of the accumulated waste is known before sliding the side wall 3, more accurate evaluation is possible.

That is, in the low-level radioactive waste treatment system of this embodiment described above, the optimum storage period and radioactivity level can be evaluated for each container 2, and the radioactivity of the waste can be sequentially measured. This allows long-term measurements and accurate evaluation of even extremely low radioactivity levels. Furthermore, it becomes possible to use a large-capacity container 2 or the like.

Therefore, even if a large amount of low-level radioactive waste 1 is generated due to demolition work in the controlled area of a facility handling radioactive materials, the low-level radioactive waste 1 can be processed more efficiently than before. It is possible to reduce the labor involved in processing work and the need for storage facilities.

[Effect of the invention] As explained above, according to the low-level radioactive waste processing system of the present invention, a large amount of low-level radioactive waste is generated due to demolition work, etc. in the controlled area of a facility handling radioactive materials. Even in such a case, it is possible to process low-level radioactive waste more efficiently than in the past, and it is possible to reduce the labor involved in processing work and the need for storage facilities.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a low-level radioactive waste processing system according to an embodiment of the present invention. 1・・・・・・・・・・・・Low level radioactive waste 2・
・・・・・・・・・・・・Container 3・・・・・・・・・・・・Side wall (slidable) 4・
・・・・・・・・・・・・γ-ray detector 5・・・・・・・・・
・・・・Weight measuring device 6・・・・・・・・・・Computing device Applicant Japan Atomic Energy Corporation Representative Patent attorney Sasu Suyama - Figure 1

Claims (1)

[Claims] (1) A container containing low-level radioactive waste, a partition plate provided between opposing inner walls of the container and configured to be slidable along the inner wall, and configured to be slidable together with the partition plate. at least one radiation measuring means; a weight measuring means for measuring the weight of the low-level radioactive waste contained in the container; A processing system for low-level radioactive waste, comprising: a calculation means for calculating the radioactivity concentration of the low-level radioactive waste stored in the low-level radioactive waste.