JP2008076318A - Gamma ray irradiation testing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gamma ray irradiation testing device which carries out a radiation irradiation test, utilizing effectively a radiation emitted from a radioactive waste, using an existing storage facility for the radioactive waste. <P>SOLUTION: The gamma ray irradiation testing device of the present invention is provided with a storage cell 22 surrounded by a radiation shielding wall, and for storing glassy solid solutions 10 of the radioactive waste plied up with a plurality of stages and a plurality of lines, and the radiation irradiation test for a radiation irradiated object is carried out by the radiation from the glassified solid matter 10 in a storage container 30, by installing the storage container 30 for storing the radiation-irradiated object in a prescribed position of the storage cell 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gamma-ray irradiation test apparatus used for irradiation tests such as evaluation of radiation resistance of materials and equipment, radiation catalytic reaction, detoxification of harmful substances such as PCB, sterilization treatment of medical waste and the like.

  Gamma-ray irradiation equipment is used for radiation tests such as evaluation of radiation resistance of materials and equipment used in nuclear facilities, radiation catalysis, detoxification of hazardous substances such as PCB, and sterilization treatment of medical waste. Conventionally, electron beam accelerators, cobalt 60, and the like have been used as radiation sources. It is not cost effective to newly introduce a gamma ray irradiation apparatus using an electron beam accelerator or cobalt 60 as a radiation source. That is, when an electron beam accelerator is used as a radiation source, there is a problem that the construction requires high costs and operation costs. In the case of cobalt 60, a gamma ray source is manufactured and a dedicated irradiation facility is constructed. Is necessary and expensive as well. Therefore, effective utilization of radiation emitted from vitrified radioactive waste is being studied. Reprocessing the fuel used in the reactor generates a large amount of high-level radioactive liquid waste. Such high-level radioactive liquid waste emits strong gamma rays, so that it is made into a stable vitrified material and sealed in a metal container or the like and stored and managed as radioactive waste for a long time. In the above-mentioned effective use, such a vitrified radioactive waste is used as a radiation source of gamma rays.

As a technique for using a radioactive solidified glass as a radiation source, for example, Patent Document 1 (Japanese Patent Laid-Open No. 62-59900) discloses irradiation using a solidified glass from a radioactive waste as a gamma ray source. An apparatus is disclosed. Furthermore, for example, Patent Document 2 (Japanese Patent Laid-Open No. 8-313697) similarly uses a vitrified material obtained by vitrifying radioactive waste as a gamma ray source, a neutron absorber containing water in the radiation passage, and only gamma rays pass through. The radiation irradiation apparatus using the radioactive waste which provided the collimator to perform between irradiation rooms is described.
JP-A-62-59900 JP-A-8-313697

  In the irradiation apparatus described in Patent Document 1, a completely new device such as a neutron absorber plate is provided so as to partition this space into a holding means for holding the irradiated object and a space for holding the irradiated object of the holding means. Irradiation equipment must be provided. Moreover, in the radiation irradiation apparatus described in Patent Document 2, it is necessary to provide a configuration such as an irradiation chamber and a collimator through which only gamma rays pass between the storage of the glass solidified body and the irradiation chamber, and the existing facilities are greatly improved. Must. That is, when the radioactive waste vitrified body is used as a radiation source as in Patent Document 1 and Patent Document 2, it is effective in using the existing radioactive waste as a radiation source, but to handle this. The cost of introducing new equipment becomes a problem.

  The present invention has been made on the basis of the above-described concept, and a gamma-ray irradiation test apparatus using radioactive waste that has greatly reduced costs by simply improving the existing radioactive waste vitrification storage facility. To that end, the invention according to claim 1 of the present invention comprises a storage cell for storing vitrified solid wastes surrounded by radiation shielding walls and stacked in a plurality of rows and rows. A storage container for storing an object to be irradiated at a predetermined position of the storage cell; storing the storage container in the storage cell together with the vitrified material of radioactive waste; It is characterized by performing a radiation irradiation test on a radiation object by radiation.

  According to a second aspect of the present invention, in the gamma ray irradiation test apparatus according to the first aspect, the storage position of the storage container is set in the storage cell according to the radiation intensity required for the irradiation test. It is characterized by.

  The invention according to claim 3 is the gamma-ray irradiation test apparatus according to claim 1 or 2, wherein the storage container is a stainless steel container, and silicon for shielding neutron beams is disposed therein. It is characterized by.

  According to a fourth aspect of the present invention, in the gamma ray irradiation test apparatus according to any one of the first to third aspects, the storage container is remotely connected to transmit information from various sensors in the storage container. A connector is provided.

  The invention according to claim 5 is the gamma ray irradiation test apparatus according to any one of claims 1 to 4, wherein the storage container is provided with a remote bolt for opening and closing the storage container by a remote device. It is characterized by being able to.

  The invention according to claim 6 is the gamma ray irradiation test apparatus according to any one of claims 1 to 5, wherein the shape of the top of the storage container is substantially the same as the shape of the top of the vitrified body. It is characterized by being equal.

  The invention according to claim 7 is the gamma ray irradiation test apparatus according to any one of claims 1 to 6, wherein the storage container includes a liquid circulation unit for a liquid irradiation test. And

  The invention according to claim 8 is the gamma ray irradiation test apparatus according to any one of claims 1 to 7, wherein the storage container is stored in and taken out of the storage cell, the storage container is opened and closed, and the glass. Storage and removal of the solidified body from the storage cell are performed by a remote device.

  According to the gamma irradiation test apparatus of the present invention, the radiation test can be carried out by effectively using the radiation emitted from the radioactive waste using the existing radioactive waste storage facility. A large radiation source is unnecessary and the economic effect is great. That is, in the gamma ray irradiation test apparatus of the present invention, a gamma ray irradiation test is performed on the irradiated object by effectively using the radiation emitted from the vitrified material being stored in the storage cell for the irradiation test under a high dose. Can do. In addition, by loading a storage container in which the object to be irradiated is stored in the vitrified body storage pit and using the vitrified body as an irradiation source, there is no need to provide a dedicated irradiation chamber, and it is inexpensive without purchasing an irradiation source. Irradiation tests can be performed. In addition, according to the gamma ray irradiation test apparatus of the present invention, the irradiated object is not contaminated by the radioactive substance, and in the detailed evaluation of the irradiated object after irradiation, the radioactive substance is attached to the irradiated object. Evaluation is possible without consideration.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, a radioactive waste vitrified body and a storage facility thereof will be described in order. FIG. 1 is a perspective view showing a partial cross section of the vitrified body. In FIG. 1, 10 is a vitrified body, 11 is a vitrified body container, 12 is a container lid, and 13 is a solidified glass. The glass solidified body 10 is made of stainless steel having a diameter of about 0.5 m and a height of about 1.0 m. The inner cylinder of the glass solidified body container 11 is a mixture of high-level radioactive liquid waste and glass mixed and melted. This is a solidified glass 13. The vitrified container 11 is sealed with a container lid 12 from above, and the vitrified body 10 emits radiation for several decades. FIG. 2 is a diagram showing a state of attenuation of radioactivity of the vitrified body.

  Next, the vitrified body configured as described above (hereinafter, the vitrified body container 11 containing the solidified glass 13 made of high-level radioactive liquid waste and glass is used in this manner. Storage facility). FIG. 3 is a perspective view showing a partial cross section of the vitrified substance storage facility. Moreover, FIG. 4 is a figure which shows the cross section of one storage pit in a vitrified body storage facility.

  In FIG. 3, 20 is a vitrified body storage facility, 21 is an upper space of the vitrified body storage facility, a transport cell for transporting the vitrified body 10, 22 is a lower space of the vitrified body storage facility, A storage cell for storing the vitrified body 10, 23 is a concrete shielding wall, 24 is a storage pit for stacking and storing a plurality of vitrified bodies, and 25 is a shield for shielding the upper part of the storage pit 24. Each plug is shown. The storage cell 22 which is an area for storing the vitrified body 10 stores the vitrified body 10 safely for several decades.

  As shown in FIG. 3, the periphery of the area where the vitrified body 10 is stored is shielded by a shielding wall 23 made of concrete, and storage pits 24 for storing the vitrified body therein are arranged in a 5 × 14 grid array 70. There is a pit. The glass solidified body 10 is carried in from an opening of a storage pit 24 provided at the upper portion, and the glass solidified body 10 can be stored up to six stacks. As described above, the storage cell 22 of the vitrified body 10 is used to safely store the vitrified body 10 for several decades. The gamma rays from the stored vitrified body 10 are described in the “Background Art” section. Thus, it can be used effectively.

  Next, a gamma ray irradiation test apparatus according to an embodiment of the present invention using such a vitrified substance storage facility will be described. FIG. 5 is a view showing a storage container constituting a part of the gamma ray irradiation test apparatus according to the embodiment of the present invention. In FIG. 5, 30 is a storage container, 31 is a storage container lid part, 32 is a storage container main body part, 33 is a remote for connecting the cable which transmits the signal from the measuring means provided in the storage container 30. Connector, 34 is a remote bolt for fastening the storage container lid 31 to the storage container main body 32, 35 is an object to be irradiated, an inner container for storing an irradiated sample, 36 is a neutron shielding silicon, 37 is a dosimeter, Reference numeral 38 denotes various sensors such as a thermometer (thermocouple) and a pressure sensor, 39 denotes a cable for transmitting signals from the dosimeter 37 and various sensors 38, and 47 denotes an opening / closing hinge.

  The storage container 30 is a stainless steel container, and the storage container lid 31 is attached to the storage container main body 32 via an opening / closing hinge 47. The inner container 35 is inserted / removed from the opening of the storage container main body 32 by remote operation. During remote operation, the cable 39 is connected by the remote connector 33 by a mechanism (not shown). The storage container lid part 31 and the storage container body part 32 are configured to be fastened by the bolts 34, respectively. The storage container lid portion 31 has the same shape as the top of the vitrified body 10 and can be operated with a hanging tool that handles the vitrified body 10.

  Next, the configuration of the storage facility of the gamma irradiation test apparatus according to the embodiment of the present invention will be described. FIG. 6 is a perspective view showing a partial cross section of the storage facility of the gamma ray irradiation test apparatus according to the embodiment of the present invention. The main change from the conventional vitrified body is a shielding plug.

  In FIG. 6, 40 is a vitrified substance storage facility for the gamma ray irradiation test apparatus of the present invention, 21 is an upper space of the vitrified substance storage facility, a transport cell for transporting the vitrified body 10, and 22 is vitrified. This is a lower space of the body storage facility, a storage cell for storing the vitrified body 10, 24 a storage pit for stacking and storing a plurality of vitrified bodies, 30, 30a and 30b are storage containers, and 41 is stored A test shielding plug for shielding the upper part of the pit 24, 45 is a crane as a transport device for the storage container 30 and the glass solidified body 10, and 46 is a hanging tool for the storage container 30 and the glass solidified body 10, respectively.

  Also in this vitrified body storage facility, the storage pit 24 is surrounded by a radiation shielding wall made of concrete, and the vitrified bodies 10 are stacked in a plurality of rows and a plurality of rows. In the storage pit 24, the storage container 30 b storing the irradiated object and the irradiated sample is placed on the uppermost stage of the storage pit 24. In order to load the vitrified body 10 and the storage container 30 in the storage pit 24 as described above, a crane 45 movable in the xy direction and a hanging tool 46 for suspending the storage container 30 and the vitrified body 10 are provided. Used.

  A test shielding plug 41 is set in the storage pit 24 on which the storage container 30b is placed, and a normal shielding plug 25 is set in the storage pit 24 on which the storage container 30b is not loaded.

  Next, a state when the storage container 30 for gamma ray irradiation test is set in the gamma ray irradiation test apparatus according to the embodiment of the present invention will be described. FIG. 7 is a diagram showing an outline of the gamma ray irradiation test apparatus according to the embodiment of the present invention. In FIG. 7, 50 is a partition provided between the control chamber outside the transfer cell 21 and the transfer cell, 51 is a pressure measuring instrument on the control room side, 52 is a temperature measuring instrument on the control room side, and 53 is on the control chamber side. Dose meter, 54 is another control device on the control room side, 55 is a through plug for connecting cables, 41 is a test shield plug, 42 is a remote connector provided on the test shield plug 41, and 43 is a test A cable reel provided in the shielding plug 41 for winding and unwinding the cable 39, 24 a storage pit, 10 a glass solidified body, 30 a storage container for storing an object to be irradiated, and 33 a storage container 30 It is a remote connector provided in the storage container lid.

The storage container 30 for storing the object to be irradiated can be handled by remote control, and is set at the uppermost stage in the storage pit 24 by remote control as shown in FIG. Gamma rays from the laminated vitrified body 10 are irradiated. Due to the configuration as described above, the irradiated object does not come into direct contact with the radioactive substance. Thereby, the irradiated object is not contaminated by the radioactive substance, and in the detailed evaluation of the irradiated object after irradiation, the evaluation can be performed without considering the attachment of the radioactive substance to the irradiated object.
Information acquired by the dosimeter 37 and various sensors 38 provided in the storage container 30 is transmitted from the cable 39 via the remote connector 42 provided on the test shielding plug 41, the pressure measuring instrument 51 on the control room side, It is transmitted to the temperature measuring device 52, the dose measuring device 53, and other measuring devices 54. By appropriately providing measurement equipment necessary for gamma ray irradiation tests, irradiation environment (temperature, pressure, etc.), continuous monitoring of irradiation dose, etc., electrical conductivity of the irradiated object, operating status (when irradiated object is equipment), etc. An irradiation test can be performed while continuously monitoring the state of the irradiated object.

  Next, a case where a liquid is handled as an irradiation object in the gamma ray irradiation test apparatus according to the embodiment of the present invention will be described. FIG. 8 is a perspective view showing a partial cross section of the inner container in the gamma irradiation test apparatus according to the embodiment of the present invention. In FIG. 8, 60 is a circulation unit, 61 is a tank, 62 is a pump, and 63 is a pipe. The circulation unit 60 can be appropriately set in the inner container 35 of the storage container 30 when handling a liquid as an irradiation object. By using this, the irradiation test is performed while circulating the liquid in the tank 61 by the pump 62. Can be configured.

  Next, a procedure for performing an irradiation test using the gamma ray irradiation test apparatus according to the embodiment of the present invention will be described. The irradiated object previously carried into the transfer cell 21 is first stored in the inner container 35 by remote control, and further set in the storage container 30 and sealed with the storage container lid 31 and the remote bolt 34. When the irradiation test is performed by circulating the liquid, the inner container 35 including the circulation unit 60 is used. Next, the shielding plug 25 of the storage pit 24 is opened using the crane 45 installed in the transfer cell 21. Then, the storage container 30 is stored in the storage pit 24 using the crane 45. Next, the remote connector 42 installed on the test shielding plug 41 and the cable 39 from the through plug 55 of the partition wall 50 of the transport cell 21 are connected by remote operation. Next, the test shielding plug 45 is installed in the storage pit 24 using the crane 45. Further, the remote connector installed on the test shielding plug 41 is lowered by the lifting device of the cable reel 43 and connected to the remote connector 33 on the upper surface of the storage container 30. By connecting the cables with various connectors according to the above procedure, the irradiation environment (temperature, pressure, irradiation dose, etc.) and the state of the irradiated object can be continuously monitored in the control room.

  The storage cell 22 is a vitrified body 10 and has a 5 × 14 × 6 stage structure, in which the vitrified body is stored. A radiation source such as cobalt-60 can be obtained by installing the storage container 30 containing the object to be irradiated in an arbitrary place (however, in the storage pit 24) in the storage cell (5 × 14 × 6 steps). An irradiation dose of about 200 to 1100 Gy / hr, which is almost the same as an irradiation facility using a laser beam, can be expected.

  Moreover, the storage container 30 can be carried out from the storage pit 24 by remote operation as required, and the state of the irradiated object can be confirmed. Since the irradiation test is performed according to the above procedure, the irradiated object is not directly in contact with the radioactive material, so the irradiated object is not contaminated and can be evaluated in detail after being taken to another facility. It is.

  Next, the flow of the irradiation test in the gamma ray irradiation test apparatus according to the embodiment of the present invention will be described. FIG. 9 is a diagram showing an irradiation test flow in the gamma ray irradiation test apparatus according to the embodiment of the present invention. In FIG. 9, when the flow starts, the process proceeds to Step 1 to set conditions for irradiation (irradiation dose and irradiation time of an object to be irradiated). Next, it progresses to Step2 and the arrangement | positioning of the to-be-irradiated object with respect to the said irradiation dose is set. In the next Step 3, the storage container 30 containing the irradiated object is actually arranged based on the previously set arrangement, and the irradiation is performed in the next Step 4. In the next Step 5, data is collected by various sensors and measuring instruments that are appropriately irradiated. In Step 6, it is determined whether or not to end irradiation based on the collected data. If No in Step 6, proceed to Step 4. If the answer is Yes in Step 6, the process proceeds to Step 7, and the storage container 30 containing the irradiated object is taken out. At Step 8, the irradiated object is evaluated and the irradiation test flow becomes END.

  As described above, according to the gamma ray irradiation test apparatus of the present invention, since the radiation irradiation test can be performed by effectively using the radiation emitted from the radioactive waste using the existing radioactive waste storage facility, Significant economic effects are achieved because no major modifications or special radiation sources are required. That is, in the gamma ray irradiation test apparatus of the present invention, the irradiation test under a high dose is performed on the irradiated object by effectively using the radiation emitted from the vitrified body 10 being stored in the storage cell 22. can do. By loading the storage container 30 in which the object to be irradiated is stored in the vitrified body storage pit 24 and using the vitrified body 10 as an irradiation source, it is inexpensive without providing a dedicated irradiation chamber and without purchasing an irradiation source. The irradiation test can be carried out. In addition, according to the gamma ray irradiation test apparatus of the present invention, the irradiated object is not contaminated by the radioactive substance, and in the detailed evaluation of the irradiated object after irradiation, the radioactive substance is attached to the irradiated object. Evaluation is possible without consideration.

It is the perspective view in which the partial cross section of the glass solidified body was shown. It is a figure which shows the mode of attenuation | damping of the radioactivity of a vitrified body. It is the perspective view by which the partial cross section of the vitrified body storage facility was shown. It is a figure which shows the cross section of one storage pit in a vitrified body storage facility. It is a figure which shows the storage container which comprises some gamma ray irradiation test apparatuses which concern on embodiment of this invention. It is the perspective view by which the partial cross section of the storage facility of the gamma ray irradiation test apparatus which concerns on embodiment of this invention was shown. It is a figure which shows the outline | summary of the gamma ray irradiation test apparatus which concerns on embodiment of this invention. It is a perspective view which shows the partial cross section of the inner container in the gamma ray irradiation test apparatus which concerns on embodiment of this invention. It is a figure which shows the irradiation test flow in the gamma ray irradiation test apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Vitrified body, 11 ... Vitrified container, 12 ... Container lid part, 13 ... Solidified glass, 20 ... Vitrified body storage facility, 21 ... Transport cell, 22 ... Storage cell, 23 ... Shielding wall, 24 ... Storage pit, 25 ... Shielding plug, 30 ... Storage container, 31 ... Storage container lid, 32 ... Storage container body 33, remote connector, 34 ... remote bolt, 35 ... inner container, 36 ... silicon for neutron shielding, 37 ... dosimeter, 38 ... various sensors, 39 ... -Cable, 40 ... Vitrified substance storage facility for gamma irradiation test equipment, 41 ... Test plug, 42 ... Remote connector, 43 ... Cable reel, 45 ... Crane, 46 ...・ Hanging tools, 47 ... Hinges for opening and closing, 50 ... Partition walls, 5 ... Pressure measuring instrument, 52 ... Temperature measuring instrument, 53 ... Dose measuring instrument, 54 ... Other measuring instrument, 55 ... Through plug, 60 ... Circulation unit, 61 ... Tank, 62 ... Pump, 63 ... Piping

Claims (8)

A storage cell that is surrounded by a radiation shielding wall and stores vitrified radioactive wastes stacked in a plurality of rows and columns, and a storage container that stores a radiation irradiated object at a predetermined position of the storage cell. The storage container is stored in the storage cell together with the vitrified material of radioactive waste, and a radiation irradiation test of a radiation irradiated object is performed by radiation from the vitrified material. apparatus. The gamma ray irradiation test apparatus according to claim 1, wherein a storage position of the storage container in the storage cell is set according to a radiation intensity required for an irradiation test. The gamma ray irradiation test apparatus according to claim 1, wherein the storage container is a stainless steel container, and silicon inside which shields neutron beams is disposed. The gamma-ray irradiation test apparatus according to claim 1, wherein the storage container is provided with a remote connector that transmits information from various sensors in the storage container. The gamma-ray irradiation test apparatus according to claim 1, wherein the storage container is provided with a remote bolt for opening and closing the storage container by a remote device. The gamma-ray irradiation test apparatus according to claim 1, wherein the shape of the top of the storage container is substantially equal to the shape of the top of the vitrified body. The gamma ray irradiation test apparatus according to claim 1, wherein the storage container contains a liquid circulation unit for a liquid irradiation test. The storage and removal of the storage container into and from the storage cell, the opening and closing of the storage container, and the storage and removal of the glass solidified body from the storage cell are operated by a remote device. 8. The gamma irradiation test apparatus according to any one of 7 above.

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