JP2006184082A - Method of sealing radioactive material storage vessel and seal check system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of sealing a radioactive material storage vessel and a seal check system which can be used continuously regardless of transfer of transportation and storage forms of the radioactive material storage vessel and are more efficient and effective than conventional ones. <P>SOLUTION: With the method, radioactive material storage vessel is sealed by putting a seal tool 2 on the vessel consisting of the vessel body containing at least radioactive material or spent fuel and its lid. The seal tool 2 includes discrimination information capable of reading by noncontact measure, and becomes unable to read the discrimination information by the noncontact measure when the seal tool 2 is unsealed. The seal check system 1 uses the seal method. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing method and a sealing confirmation system for sealing a radioactive substance storage container.

In Japan, based on the Nuclear Non-Proliferation Treaty, safeguards have been implemented to verify that radioactive materials are not diverted to weapons. One effective means of performing warranty measures is containment and surveillance. Containment is to physically seal radioactive material by attaching a seal to a radioactive material storage container or the like that is being transported or stored so that it can be detected even if the container is opened without permission. The monitoring is to use a radiation measurement, a camera, a monitor or the like to prevent unauthorized movement of spent fuel and the like. The technical purpose of containment and monitoring is to detect the diversion of a significant amount of radioactive material in a timely manner and to prevent diversion by raising the risk of early detection.
In general, spent fuel generated at nuclear power plants is stored in a cooling pool in the nuclear power plant until the radiation dose falls below a predetermined level, and then transported to a reprocessing plant or intermediate After being transported to a storage facility and temporarily stored, it is transported to a reprocessing plant.
In recent years, spent fuel generated at nuclear power plants has increased along with power generation demand, so even if the reprocessing plant operates, the spent fuel generated in Japan will exceed the processing capacity of the reprocessing plant. The opportunity for temporary storage at intermediate storage facilities is increasing and the storage period tends to be extended.
As described above, in the case of passing through storage in an intermediate storage facility, it is generally effective to use a transport / storage cask as a radioactive substance storage container.

Here, an example of the structure of the transport and storage cask will be described with reference to FIG.
As shown in FIG. 11, the transport / storage cask 10 includes a cask body 11 having a storage chamber 12 for storing spent fuel, and a primary lid 17 and a secondary lid 19 that seal the cask opening 13. . When the transport / storage cask 10 is transported, the buffer body 21 is further fitted on the upper and lower portions of the cask.

The primary lid 17 is formed with a primary lid flange portion 17b in the circumferential direction on the upper portion of the primary lid body 17a, and is formed in the primary lid bolt hole 17c penetrating the primary lid flange portion 17b and the cask opening 13 in the circumferential direction. The primary lid bolt 18 is fixed by being screwed into the primary screw hole 14a of the primary step portion 14 thus formed.
The secondary lid 19 has a secondary lid flange portion 19b formed in the circumferential direction on the upper portion of the secondary lid body 19a covering the primary lid 17, and a secondary lid bolt hole 19c penetrating through the secondary lid flange portion 19b. The secondary lid bolt 20 is fixed by being screwed into the secondary screw hole 15a of the secondary step portion 15 formed in the cask opening 13 in the circumferential direction.
The buffer body 21 installed in the upper part of the cask has a buffer body bolt hole 22 c provided in the circumferential direction, a buffer body bolt hole 22 c formed in the tertiary step portion 16 of the cask body 11, and a buffer body bolt 22. Is fixed by screwing. Thus, after the shock absorber 21 is fitted on the upper part of the cask, the secondary lid 19 cannot be visually observed.
Similarly, the buffer body 21 installed at the lower portion of the cask is fixed to the cask bottom 10b by a buffer bolt (not shown).

Conventionally, there are several types of sealing methods for radioactive storage containers. In particular, sealing with a metal cap is widely used (see Patent Document 1). This sealing method is also used for the transport / storage cask 10.
Here, a case where the transport / storage cask 10 is sealed with a metal cap will be described with reference to FIG. In FIG. 12, (a) shows the transport / storage cask 10 during transport, and (b) shows the transport / storage cask 10 during storage.

As shown in FIG. 12A, when the transport / storage cask 10 is transported, the buffer body 21 is externally fitted. At this time, in order to seal with the metal cap 100, first, the through-holes 22f for wires are horizontally drilled in the heads of the two buffer bolts 22, respectively. Then, one wire 101 is inserted into each wire through hole 22f, both ends of the wire 101 are twisted together, and then the metal cap 100 is mounted on the twisted portion, and the portion is crimped irreversibly. The wire 101 is straddled across the two buffer bolts 22 by detention.
Therefore, the metal cap 100 or the wire 101 is broken when the action of removing the buffer body 21 is performed for the purpose of opening the cask, and can be visually confirmed.

As shown in FIG. 12B, the buffer body 21 is removed when the transport / storage cask 10 is stored. At this time, in order to seal with the metal cap 100, first, the through holes 20 f for the wires are horizontally drilled in the heads of the two secondary lid bolts 20. Then, one wire 101 is inserted into each wire through-hole 20f, and both ends of the wire 101 are twisted together, and then the metal cap 100 is mounted on the twisted portion, and the portion is crimped irreversibly. The wire 101 is straddled across the two secondary lid bolts 20 by being restrained.
Therefore, the metal cap 100 or the wire 101 is broken by the cask opening action and can be visually confirmed.
JP 11-248877 A (paragraph 0003)

That is, since the conventional sealing method is based on visual observation, it has been necessary to add a seal to a visible place in accordance with the attachment / detachment of the buffer body accompanying the transfer of the radioactive substance storage container.
The work of adding a seal increases the amount of work for the employee and increases the risk of exposure to the employee. Furthermore, during the seal addition operation, there is a period during which no seal can be confirmed in the radioactive material storage container, so it is not necessarily sufficient to achieve proper containment and monitoring. In addition, while radioactive materials temporarily stored in intermediate storage facilities increase, the human resources of prosecutors and inspectors are limited, so there is a need for more efficient and effective containment and monitoring technologies than ever before. It has been.

  Therefore, the present invention provides a radioactive substance storage container sealing method and a seal confirmation system that can be used continuously regardless of the transition of the transport / storage form of the radioactive substance storage container and that is more efficient and effective than before. The purpose is to do.

In order to achieve the above object, the present invention provides a radioactive substance storage container including a radioactive substance storage container including at least a radioactive substance or spent fuel, and a lid attached to the radioactive substance storage container. A sealing method for sealing, wherein the sealing tool includes identification information that can be read by a non-contact means, and when the sealing tool is opened, the identification information cannot be read by the non-contact means. This is a characteristic sealing method.
By setting it as such a structure, the method of confirming opening of the sealing tool accompanying opening of a radioactive substance storage container without visual observation can be provided.

  Furthermore, the non-contact means includes wireless communication means, and the identification information is recorded in a nonvolatile memory, so that a method for confirming without visual observation can be provided more specifically.

In addition, the sealing tool has a calculation processing unit having an output result that differs depending on input information by the wireless communication unit, and the output result is associated with the identification information of the radioactive substance storage container. The reading of the identification information before opening the seal can be prevented, and the sealing tool can be prevented from being duplicated.
Further, the non-contact means cannot read the identification information due to the breakage of the nonvolatile memory, thereby preventing the identification information from being read after the seal is opened and preventing the sealing tool from being duplicated. can do.

  In addition, seals can be installed in various forms of radioactive material storage containers by forming notches and through holes at the installation site of the seals, or by installing seals on bolts that fix the lid to the container body. can do. In the present invention, the configuration of the sealing tool can be appropriately changed according to the form of the radioactive substance storage container.

Further, the present invention is a seal confirmation system using the sealing method, comprising a seal opening determination means for determining the opening of the sealing tool, wherein the seal opening determination means is within a predetermined time from the start of work. When the proper identification information is received, it is determined that the sealing tool is unopened, and when the proper identification information cannot be received within a predetermined time from the start of work, the sealing tool is determined to be opened. This is a seal confirmation system.
By adopting such a configuration, it is possible to provide a sealing tool opening determination method.

  Furthermore, since the identification information read by the wireless communication means is distributed to the remote place by the communication means, a means capable of managing the radioactive substance at the remote place can be provided.

  According to the present invention, there is provided a sealing method and a sealing confirmation system for a radioactive substance storage container that can be used continuously regardless of the transition of the transportation / storage form of the radioactive substance storage container, and that is more efficient and effective than before. Can do.

Hereinafter, the best mode (hereinafter referred to as “embodiment”) for carrying out the sealing method and the sealing confirmation system of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a configuration diagram of a seal confirmation system 1 according to the present embodiment.
The seal confirmation system 1 includes a seal tool 2 attached to a transport / storage cask (referred to as a cask as appropriate) 10 and a seal confirmation device 6 installed at a predetermined distance from the cask 10.

As shown in FIG. 1, the sealing tool 2 is stuck so as to straddle a part of the secondary lid 19 and a part of the cask main body 11 adjacent thereto. With such a configuration, a part of the sealing tool 2 can be broken when the cask 10 is opened.
In the present specification, “breaking” not only means that the member is cut, but also includes a loss of function necessary for the sealing device 2 due to a physical load.

  The sealing tool 2 has the cask identification information recorded therein, the RFID-IC chip 3 disposed on the boundary line 23 between the secondary lid 19 and the cask main body 11, and the linear arrangement from the RFID-IC chip 3. The antenna 4 includes an RFID-IC chip 3 and a sheet member 5 provided with an adhesive unit for attaching the antenna 4 to the cask 10. Note that the sheet member 5 is notched from the outer line on both sides to the substantially central portion, and the RFID-IC chip 3 is detachably mounted in a portion narrowed by the notch. It is stuck so that the boundary line 23 is located in a place narrowed by the notch. That is, the sealing tool 2 is formed such that when the cask 10 is opened, stress concentrates on the RFID-IC chip attachment site in the sheet member 5 and the nearby RFID-IC chip 3 is broken.

  In the RFID-IC chip 3, a semiconductor-based circuit is formed on one surface of the chip substrate 30, and an information storage unit 31 in which cask identification information is recorded in the center of the chip substrate 30 as shown in FIG. An arithmetic storage unit 32 and an amplifying / modulating / power source unit 33 are disposed around the chip substrate 30. The bus line 34 is routed so as to connect the information storage unit 31, the operation storage unit 32, and the amplification / modulation / power supply unit 33. Further, as shown in FIG. 2B, a groove 35 is formed on the opposite side of the information storage unit 31 across the chip substrate 30. When the cask 10 is opened, the stress is concentrated on the groove 35 in the RFID-IC chip 3 so that the information storage unit 31 in the vicinity is broken.

Cask identification information is recorded in the information storage unit 31, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), FRAM (Ferroelectric Memory Random Memory). Or the like. The recorded cask identification information is, for example, a cask identification number, information on loaded fuel, storage start time, and the like.
In addition, when the cask identification information is encrypted and transmitted / received to / from the terminal PC 8, a program necessary for encryption / decryption can be recorded in the information storage unit 31. For example, in this embodiment, in order to encrypt the cask identification information and transmit it to the terminal PC 8 (see FIG. 1), the information storage unit 31 includes an encryption / decryption unit 45 (see FIG. 3) of the terminal PC 8 described later. The same common key is stored.

  The arithmetic storage unit 32 includes a CPU (Central Processing Unit) that is a general arithmetic processing unit and a volatile memory that is a work area thereof. The arithmetic storage unit 32 has a function of encrypting a read request for information via the reader antenna 7 to be described later using the common key. The amplification / modulation / power supply unit 33 is a circuit that performs microwave detection, modulation / demodulation, and power supply to each part of the RFID-IC chip 3. The bus line 34 includes a signal line for passing cask identification information and control signals and a power supply line for supplying power.

The antenna 4 is electrically connected to the amplification / modulation / power supply unit 33.
The antenna 4 receives and transmits microwaves, supplies the received microwaves to the amplification / modulation / power supply unit 33, and transmits the output supplied from the amplification / modulation / power supply unit 33 as microwaves.

The sheet member 5 is preferably insulative in order to reduce the attenuation of microwaves in the vicinity of the antenna 4. Furthermore, it is desirable that the sheet member 5 has a structure having an appropriate rigidity that does not easily break due to an external force such as an impact received during transportation of the cask 10. As a member that satisfies the above conditions, for example, vinyl chloride, polypropylene, polyethylene terephthalate, or the like can be applied.
As for the adhesive means provided in the sheet member 5, the heat-resistant resin that does not deteriorate due to heat radiation from the radioactive material stored in the cask 10 and the stress generated when the cask 10 is opened are appropriately transmitted to the RFID-IC chip 3. Therefore, it can be selected from a curable resin or the like. Further, in order to reduce the attenuation of the microwave in the vicinity of the antenna 4, an insulating resin can be selected. For example, the resin can be appropriately selected from an epoxy adhesive, an acrylic adhesive, a phenol resin adhesive, and the like.
Note that the sheet member 5 is not necessarily required as long as at least the RFID-IC chip 3 can be attached to the cask 10 by the bonding means. The sheet member 5 can be appropriately used according to the installation form of the sealing tool 2. Further, the shape of the sheet member 5 can be selected as appropriate.

  As shown in FIG. 1, the sealing confirmation device 6 that confirms the opening of the sealing tool 2 includes a reader antenna 7 and a terminal PC 8 that is electrically connected to the reader antenna 7.

  The reader antenna 7 receives and transmits microwaves, supplies the received microwaves to the wireless communication unit 44 (see FIG. 3) of the terminal PC 8, and transmits the output supplied from the wireless communication unit 44 as microwaves. .

  The terminal PC 8 includes a CPU (Central Processing Unit) that is a general arithmetic processing unit, a memory that is used as a work area of the CPU, a hard disk storage device that is a storage unit for storing data, a keyboard, a mouse, and the like. An input device 41 configured, and a display device 42 configured by an LCD (Liquid Crystal Display) display or the like are provided.

Here, the configuration of the processing unit of the terminal PC 8 will be described with reference to the block diagram shown in FIG.
The terminal PC 8 includes a seal confirmation instruction unit 43, a wireless communication unit 44, an encryption / decryption unit 45, and a seal opening determination unit 46.
The seal confirmation instructing unit 43 includes at least an arithmetic processing unit, generates a seal confirmation start signal from a seal confirmation instruction input by the cask administrator via the input device 41, and transmits it to a predetermined processing unit. The wireless communication unit 44 detects and modulates / demodulates microwaves received and transmitted via the reader antenna 7. The seal opening determination unit 46 includes at least an arithmetic processing unit, and performs the opening determination of the sealing tool 2 by detecting the presence / absence of cask identification information transmitted from the sealing tool 2.
Further, when the cask identification information is encrypted and transmitted / received to / from the terminal PC 8, a processing unit necessary for encryption / decryption can be appropriately installed. For example, in the present embodiment, in order to decrypt the encrypted cask identification information, an encryption / decryption unit 45 including at least a storage unit and an arithmetic processing unit is installed, and the encrypted cask identification is stored in the storage unit. A common key necessary for decrypting information is stored. As described above, the common key is the same as that stored in the information storage unit 31 (see FIG. 2) of the RFID-IC chip 3.

  Here, operation | movement of the seal | sticker confirmation system 1 of this embodiment is demonstrated with reference to FIG. 2 thru | or FIG. For the configuration of the RFID-IC chip 3 that performs each operation, refer to FIG. 2 as appropriate, and for the configuration of the processing unit of the seal confirmation device 6 that performs each operation, refer to FIG. 3 as appropriate. FIG. 4 is a flowchart of seal opening determination.

The cask manager instructs the sealing confirmation instructing unit 43 to confirm opening of the sealing tool 2 via the input device 41 of the terminal PC 8 shown in FIG.
The seal confirmation instructing unit 43 generates a seal confirmation start signal and transmits it to the RFID-IC chip 3 (see FIG. 2) via wireless communication (step S01).

  In FIG. 2, the arithmetic storage unit 32 of the RFID-IC chip 3 receives the cask identification information and the common key from the information storage unit 31 when receiving the seal confirmation start signal via the reader antenna 7 and the wireless communication unit 44. 32, the cask identification information is encrypted, and transmitted to the terminal PC 8 (see FIG. 3) via wireless communication (step S02).

In FIG. 3, the terminal PC 8 determines whether or not the encrypted cask identification information is received from the RFID-IC chip 3 within a predetermined time after transmitting the sealing confirmation start signal to the RFID-IC chip 3. (Step S03). When received, this is notified to the encryption / decryption unit 45 (Yes in step S03).
If reception is not possible within the predetermined time (No in step S03), the seal opening determination unit 46 determines that the seal has been opened and displays “opened” on the display device (step S07). ).

  The encryption / decryption unit 45 decrypts the cask identification information in accordance with the recorded common key (step S04), and notifies the seal / open determination unit 46.

  The sealing / opening determination unit 46 verifies the decrypted cask identification information (seal confirmation determination) (step S05), and when it is determined that it is not opened (OK in step S05), displays the cask identification information on the display device. (Step S06).

  On the contrary, as a result of verification (sealing confirmation determination) of the decrypted cask identification information by the seal opening determination unit 46 (step S05), when it is determined that it has been opened (NG in step S05), “opened” is displayed. It is displayed on the device (step S07).

  Thus, when “opened” is displayed, the case where the sealing tool 2 is actually broken by opening the cask 10 and that the forged sealing tool 2 is used, In some cases, the cask identification information is transmitted without being encrypted from the sealing tool 2, or the encrypted cask identification information cannot be properly decrypted by the encryption / decryption unit 45 in the terminal PC 8.

  Moreover, in FIG. 4, it can be set as the structure which confirms periodically until the sealing tool 2 is opened by performing the transmission of step S01 by the seal | sticker confirmation apparatus 6 with an appropriate space | interval.

According to the above, the following effects can be obtained in the present embodiment.
By providing a sealing method that can confirm the open state of the seal attached to the radioactive material storage container without visual observation, it is possible to use the seal continuously regardless of the transition of the transportation / storage form of the radioactive material storage container. . Accordingly, it is possible to reduce the work amount of the employee and the risk of exposure to the employee due to the additional work of sealing. Furthermore, since the seal is continuously used regardless of the transition of the transportation / storage form, sufficiently appropriate containment and monitoring can be achieved.
In addition, when opening the sealing tool, in particular, the information storage unit is easily broken, thereby preventing reading of the identification information after the sealing is opened and preventing the sealing tool from being duplicated. .
In addition, the seal opening determination method provided in this embodiment can be easily applied to collective seal opening confirmation of multiple radioactive substance storage containers, seal opening confirmation from a remote location, periodic automatic seal opening confirmation, etc. It is. Therefore, probators and inspectors with limited human resources can implement efficient and effective probation, and can cope with the increase of radioactive materials temporarily stored in intermediate storage facilities. .

  In addition, this invention is not limited to the said embodiment, A various change implementation can be performed in the range which the technical idea covers.

  For example, in this embodiment, the seal confirmation device 6 is configured by the reader antenna 7 and the terminal PC 8 connected to the reader antenna 7, but the cask identification information recorded on the RFID-IC chip 3 of the seal tool 2 is read. If it is possible, it is not limited to the above. For example, the seal confirmation device 6 may be configured by a tag reader / writer. Moreover, it is good also as a structure which delivers the opening information of the sealing tool 2 to the manager of a remote place by connecting to the network from terminal PC8. In that case, it is preferable to encrypt data transmission / reception between networks by a known technique to prevent the cask identification information from being read or copied by a third party.

  Further, the place where the sealing tool 2 is broken when the cask 10 is opened is not limited to the RFID-IC chip 3. For example, the place to be broken may be the antenna 4. When the antenna 4 is broken, wireless communication becomes impossible, and the opening of the sealing tool 2 can be detected. Further, the location where the RFID-IC chip 3 is broken is not limited to the information storage unit 31. For example, the location to be broken may be the arithmetic storage unit 32, the amplification / modulation / power supply unit 33, the bus line 34, or the like. Even if any one of them breaks, it becomes impossible to transmit the cask identification information to the terminal PC 8, and the opening of the sealing tool 2 can be detected.

  In the operation of the seal confirmation system according to the present embodiment, the transmission of the cask identification information from the RFID-IC chip by the common key method has been described. However, the public key-private key method may be used.

For example, the public key-private key method can also be described along the flowchart of FIG.
When the seal confirmation instructing unit 43 generates a seal confirmation start signal and transmits it to the RFID-IC chip 3 (step S01), the seal confirmation instruction unit 43 transmits the signal to the RFID-chip 3 with a public key attached.
Upon receiving the seal confirmation start signal and the public key, the arithmetic storage unit 32 of the RFID-IC chip 3 reads the cask identification information from the information storage unit 31 to the arithmetic storage unit 32, encrypts the cask identification information, and then stores the terminal PC8 ( (See FIG. 3) (step S02).

  In FIG. 3, the encryption / decryption unit 45 decrypts the cask identification information in accordance with the stored secret key (step S04), and notifies the seal / open determination unit 46. In FIG. 4, the other operations are the same as the above-described common key method, and thus detailed description thereof is omitted.

  That is, according to the public key-private key method, different output results can be transmitted from the RFID-IC chip 3 according to the input information of the wireless communication.

  Furthermore, the present embodiment is not limited to the encryption communication method described above, and various encryption communication techniques that are publicly known techniques can be applied. Also, it is not always necessary to encrypt the cask identification information and transmit it wirelessly. Not encrypting may cause the cask identification information to be read or copied by a third party, but it is also possible to cope with it by a method different from encryption communication. For example, when cask identification information is wirelessly transmitted from the sealing tool 2, by reducing the output of the microwave to be transmitted and limiting the wireless transmission range, the cask seal information can be read from outside the storage facility by a third party. Can be prevented.

Furthermore, the sealing tool 2 used in the sealing method according to the present invention is for detecting the opening of the cask 10 by its breakage, and can be installed at a location where the sealing tool 2 can be broken when the cask 10 is opened. If so, various installation forms can be applied.
Hereinafter, it demonstrates along with other embodiment examples, referring drawings. In the drawings to be referred to, members having the same function are described by giving the same reference numerals, but the shapes, sizes, etc. are not necessarily the same.

[Other Embodiment 1]
FIG. 5 is a diagram showing a first embodiment of the present invention.
Other Embodiment 1 is a case of sealing the cask 10 having a structure in which the secondary lid collar portion 19b is fitted to the cask body 11 in the same manner as the cask 10 of the present embodiment.
A notch part (secondary lid notch part 19d and cask body notch part 11d) continuous in the radial direction is formed from a part of the secondary lid 19 to a part of the cask body 11 adjacent thereto, and the notch part is sealed. The tool 2 is configured to be loosely fitted.
Further, the sealing tool 2 is fixed by a resin embedded in the notch. Further, it is not necessary to loosely fit the entire length of the antenna 4 into the notch, and it can be appropriately exposed from the notch for the purpose of receiving and transmitting an appropriate microwave. In addition, in order to implement | achieve favorable communication, it is preferable to make the antenna 4 float a predetermined distance from the metal part of the cask 10. FIG. This is the same for each embodiment.
Moreover, resin which fixes the sealing tool 2 and embed | buries in a notch part can be suitably selected from what was mentioned above in this embodiment.

[Other Embodiment 2]
FIG. 6 is a diagram showing a second embodiment of the present invention.
In the second embodiment, the secondary lid collar portion 19b seals the cask 10 having a structure that is hooked on the cask main body 11.
Even in such a structure of the secondary lid 19, a notch portion (secondary lid notch portion 19 d and the cask that is continuous in the axial direction) extends from a portion of the secondary lid 19 to a portion of the cask body 11 adjacent thereto. By forming the main body cutout portion 11d), the sealing tool 2 is loosely fitted into the cutout portion.

[Other Embodiment 3]
Other Embodiment 3 to Other Embodiment 5 are cases where the secondary lid is sealed to the secondary lid bolt 20 that fixes the secondary lid to the cask main body 11 regardless of the structure of the cask 10.
FIG. 7 is a diagram showing a third embodiment of the present invention.
A secondary lid notch 19d is formed in a part of the secondary lid 19 adjacent to the bolt head side surface 20a of the secondary lid bolt 20, and a sheet member is provided between the bolt head side surface 20a and the secondary lid notch 19d. The sealing tool 2 provided with 5 is straddled. The antenna 4 loosely fitted in the secondary lid notch 19d is bent from the middle along the shape of the secondary lid notch 19d, and the sealing tool 2 is generally L-shaped as a whole.

[Other Embodiment 4]
FIG. 8 is a diagram showing a fourth embodiment of the present invention.
A continuous notch portion (secondary lid bolt notch portion 20d and secondary lid notch portion 19d) is formed from the bolt head side surface 20a of the secondary lid bolt 20 to a part of the secondary lid 19 adjacent thereto. The sealing tool 2 is loosely fitted into the notch.
The antenna 4 loosely fitted in the secondary lid notch 19d is bent halfway along the shape of the secondary lid notch 19d, and the sealing device 2 as a whole is substantially L-shaped.

[Other Embodiment 5]
FIG. 9 is a diagram showing a fifth embodiment of the present invention.
A through hole (secondary cover bolt through hole 20e and secondary cover notch 19d) is formed from the bolt head outer peripheral portion 20b of the secondary cover bolt 20 to a part of the adjacent secondary cover 19, and the through hole is sealed. The tool 2 is configured to be loosely fitted.

  As described above in other embodiments 1 to 5, the sealing device 2 is installed on a bolt for forming a notch or a through-hole in the installation location of the sealing device 2 or fixing the lid to the container body. By doing so, the sealing tool 2 can be installed in various types of radioactive substance storage containers. For example, the lid on which the sealing tool 2 can be installed is not limited to the secondary lid 19. Moreover, the structure of the sealing tool 2 can also be suitably changed according to the form of a radioactive substance storage container.

  Moreover, the sealing tool 2 of this embodiment can reduce the attenuation of the microwave in the vicinity of the antenna 4 by appropriately configuring the sheet member 5 and the adhesive means with the insulating member as described above. The efficiency of receiving and transmitting microwaves may be further increased by changing the form and arrangement of the above. For example, the shape of the antenna 4 is not limited to the linear shape as described above, but can be variously modified within the range of functioning as an antenna. For example, it may be rectangular, circular, or coiled. Also, the length of the antenna 4 can be variously adjusted within the range of functioning as an antenna. An example of this will be described with reference to FIG.

[Other Embodiment 6]
FIGS. 10A and 10B are partial cross-sectional views of the cask 10 for showing the routing of the antenna 4 of the sealing tool 2, wherein FIG. 10A is a storage time and FIG. 10B is a transportation time.
As shown in FIG. 10A, the antenna 4 extends along the cask outer edge 10c from the cask upper surface 10a on which the RFID-IC chip 3 is installed. With such a configuration, the efficiency of microwave transmission / reception can be increased. As shown in FIG. 10B, even when the buffer body 21 is installed in the cask 10 during transportation, a part of the antenna 4 can be exposed without changing the routing.

It is a block diagram of the sealing confirmation system for enforcing the sealing method which is one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view of an RFID-IC chip provided in a sealing device according to an embodiment of the present invention, where (a) is a top view thereof and (b) is a side view thereof. It is a block diagram which shows the structure of the sealing confirmation apparatus which is one Embodiment of this invention. It is a flowchart of the seal opening determination which is one Embodiment of this invention. It is a partial expansion perspective view of the cask in which the sealing tool which is the other embodiment example 1 of this invention was installed. It is a partial expansion perspective view of the cask in which the sealing tool which is the other embodiment example 2 of this invention was installed. It is the elements on larger scale of the secondary lid volt | bolt in which the sealing tool which is the other Example 3 of this invention was installed. It is the elements on larger scale of the secondary lid volt | bolt in which the sealing tool which is the other Example 4 of this invention was installed. It is a fragmentary sectional view of the secondary cover volt | bolt in which the sealing tool which is other Example 5 of this invention was installed. It is a fragmentary sectional view of the cask for showing the antenna arranged by the sealing tool which is the other embodiment example 6 of this invention, Comprising: (a) is at the time of storage, (b) is at the time of transport. It is a disassembled perspective view which shows an example of the structure of a cask for transportation storage. It is the partial expansion perspective view of the cask for transportation storage combined with the metal cap conventionally, Comprising: (a) is at the time of transportation, (b) is at the time of storage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal confirmation system 2 Sealing tool 3 RFID-IC chip 4 Antenna (wireless communication means)
5 Sheet member 6 Seal confirmation device 7 Reader antenna (wireless communication means)
8 Terminal PC
10 Transport and storage cask (radioactive material storage container)
11 Cask body (container body)
11d Cask body notch (notch)
17 Primary lid 19 Secondary lid (lid)
19b Secondary lid collar (buttock)
19d Secondary lid notch (notch)
20 Secondary lid bolt (bolt)
20a Bolt head side surface 20b Bolt head outer periphery 20d Secondary lid bolt notch (notch)
20e Secondary lid bolt through hole 21 Buffer 30 Chip substrate 31 Information storage unit (non-volatile memory)
32 arithmetic storage unit (arithmetic processing means)
33 Amplification / modulation / power supply (wireless communication means)
34 Bus Line 35 Groove 41 Input Device 42 Display Device 43 Seal Confirmation Instruction Unit 44 Wireless Communication Unit (Wireless Communication Means)
45 Encryption / Decryption Unit 46 Seal Opening Determination Unit (Sealed Open Determination Unit)

Claims (16)

A sealing method for sealing a radioactive substance storage container by attaching a sealing tool to a radioactive substance storage container including a container main body containing at least the radioactive substance or spent fuel and a lid thereof,
The seal includes identification information that can be read by non-contact means,
The sealing method is characterized in that the identification information cannot be read by the non-contact means by opening the sealing tool.   The sealing method according to claim 1, wherein the non-contact means includes wireless communication means.   The sealing method according to claim 2, wherein the sealing tool includes an arithmetic processing unit that outputs different results according to input information from the wireless communication unit.   The sealing method according to claim 3, wherein the output result is associated with the identification information of the radioactive substance storage container.   The sealing method according to any one of claims 1 to 4, wherein the identification information is recorded in a non-volatile memory.   6. The sealing method according to claim 5, wherein the identification information cannot be read by the wireless communication means due to the breakage of the nonvolatile memory.   The said sealing tool is installed so that it may straddle a part of said lid | cover and a part of said container main body adjacent to a part of this lid | cover. The sealing method described. In the case where the lid of the lid seals the radioactive substance storage container fitted in the container body,
The sealing device is attached to a cutout portion formed continuously in a radial direction from a part of the lid to a part of the container main body adjacent to a part of the lid. The sealing method according to 7. In the case of sealing the radioactive substance storage container that the collar of the lid is hooked on the container body,
The said sealing tool is affixed on the notch part continuously formed in the axial direction over a part of said lid | cover and a part of container main body adjacent to a part of this lid | cover. The sealing method described in 1. In the case of sealing a bolt for fixing the lid to the container body,
The said sealing tool is installed so that it may straddle over a part of said volt | bolt and a part of said lid | cover adjacent to a part of this volt | bolt, The said any one of Claim 1 thru | or 6 characterized by the above-mentioned. Sealing method.   The said sealing tool is affixed on the notch part formed in the part of the said lid | cover adjacent to the head side surface of the said bolt, and the head side surface of this bolt, It is characterized by the above-mentioned. Sealing method.   The said sealing tool is affixed on the notch part formed continuously from the head side surface of the said bolt to a part of said lid adjacent to the head side surface of this bolt. The sealing method described.   The said sealing tool is affixed on the through-hole formed from the head outer peripheral part of the said bolt to a part of lid | cover adjacent to the head outer peripheral part of this bolt. Sealing method.   14. The sealing device according to any one of claims 1 to 13, wherein the sealing tool is installed between the radioactive substance storage container and a transport buffer externally fitted to the radioactive substance storage container. The sealing method described. A sealing confirmation system using the sealing method according to any one of claims 2 to 14,
A seal opening determination means for determining opening of the sealing tool;
The seal opening determination means determines that the seal is unopened when receiving the appropriate identification information within a predetermined time from the start of work, and cannot receive the appropriate identification information within a predetermined time from the start of work. A seal confirmation system characterized in that it is sometimes determined that the seal is opened.   The seal confirmation system according to claim 15, wherein the identification information read by the wireless communication unit or the determination result determined by the seal opening determination unit is distributed to a remote place by the communication unit.

Images