JP6402851B2 - Sealing device for through plug - Google Patents

Description

  The present invention relates to a sealing device for a through plug used when a through plug arranged in an opening of a cell wall that divides a cell chamber and a maintenance area is attached and detached.

  Work to handle high-level radioactive waste is performed inside the cell room separated from the maintenance area by radiation shielding material such as concrete, and as the work to be performed in the cell room, for example, a high-level radioactive waste liquid using a glass melting furnace There is work to vitrify.

  The glass melting furnace installed in the cell room uses equipment such as crane equipment, chain blocks, and manipulators while monitoring images from a monitor TV provided in a maintenance area outside the cell wall and a window using shielding glass. Various operations are performed by remote control.

  Since the cell chamber is equipped with electricity-driven equipment and lighting devices, power, lighting, and control electricity are required, and fluids such as air and water may be supplied. . For this reason, the cell wall has an opening communicating with the maintenance area and the cell chamber, and a through plug having a length substantially the same as the thickness of the cell wall is provided in the opening, and the air tightness is maintained by the through plug. Electricity and fluid are supplied to the cell chamber.

  The through plug has a steel plate casing, an inner terminal protruding to the cell chamber is provided at one end of the steel plate casing, and an outer terminal protruding to the maintenance area side is provided at the other end of the steel plate casing. And the electric wire which connects the said inner side terminal and an outer side terminal in the inside of a steel plate casing has the radiation shielding performance equivalent to a cell wall, and is being fixed by the radiation shielding material with which the steel plate casing was filled. When the cell chamber is provided with a device driven by air pressure or hydraulic pressure, a pipe for supplying fluid such as pressurized air or pressurized oil is provided in the through plug, and water supply There may be a case where a pipe for use is provided in the through plug.

  In order to maintain the performance of the through plug, it is necessary to periodically remove it from the cell wall for inspection, and when the specification of the device provided in the cell chamber is changed, the specification corresponds to the specification. It is necessary to replace with another through plug with wiring, terminals, piping, etc. In order to inspect or replace the through plug, it is necessary to detach and attach the through plug installed on the cell wall and to reattach it.

  When extracting the through plug from the cell wall, after removing the remote joint connected to the inner terminal of the through plug in the cell chamber, and after removing the outer joint connected to the outer terminal of the through plug in the maintenance area, Remove the through plug from the opening in the cell wall to the maintenance area. When extracting the through plug, radiation shielding and airtightness must be taken so that the radiation and contaminants in the cell chamber do not flow into the maintenance area. Usually, in order to prevent contaminants in the cell chamber from flowing into the maintenance area, the pressure in the cell chamber is adjusted to a negative pressure lower than the pressure in the maintenance area.

  As a sealing method for preventing contaminants from flowing into the maintenance area when the through plug is removed from the opening of the cell wall, a method called bag-in / bag-out is generally adopted. In this bag-in / bug-out method, a cylindrical plastic bag of the required length is placed in a contracted state on the outer periphery of the through plug protruding to the maintenance area side, and one end of the plastic bag is attached to the opening on the maintenance area side. Attach the other end of the plastic bag to the through plug. When this plastic bag is provided, even if the through plug is removed, the plastic bag extends and seals the opening on the maintenance area side. Can be prevented. When extraction of the through plug is completed, the plastic bag connecting the opening on the maintenance area side and the through plug is sealed at two places with a high-frequency sealer or the like, and an intermediate position between the two seal portions is cut. As a result, the opening on the maintenance area side is kept sealed, and the through plug can be carried out. In addition, when inserting a through plug for inspection or replacement into the opening of the cell wall, one end of the plastic bag is attached to the opening on the maintenance area side in the same manner as the bag-in / bag-out method. The other end of the through plug is attached to the through plug, and the through plug is inserted with the opening on the maintenance area side sealed.

  On the other hand, the plastic bag cannot prevent radiation from the cell chamber toward the maintenance area through the opening. For this reason, a temporary shield having a size for closing the opening on the cell chamber side is arranged in the cell chamber, and the temporary shield prevents the radiation from flowing out to the maintenance area side through the opening.

  As a prior art document that simplifies the work of extracting the through plug to the maintenance area side, a lifting table that can be raised and lowered with respect to a traveling carriage that runs parallel to the cell wall is provided, and the through plug is provided on the lifting table. There is a through plug attaching / detaching device provided with a connecting device that is coupled to the through plug and movable in the axial direction of the through plug (see Patent Document 1).

Japanese Patent Laid-Open No. 06-331790

  When removing and inserting the through plug, as described above, the opening on the maintenance area side is sealed by the bag-in / bag-out method, and a temporary shield is disposed in the cell room to close the opening on the cell room side. Yes.

  However, the following problems can be considered in the above method. When the bag-in / bag-out method is employed, the cell chamber is maintained at a negative pressure as described above, so that the removal of the through plug is started and the plastic bag is crushed so as to be in close contact with the through plug. For this reason, it is difficult to carefully extract the through plug so that the plastic bag is not damaged. Further, when the plastic bag is broken, it may be difficult to maintain the cell chamber at a negative pressure. In addition, since the temporary shield is simply arranged so as to cover the front surface of the opening on the cell chamber side, there is a gap between the temporary shield and the cell wall, and the cell chamber passes through this gap. There is a possibility that the radiation will be discharged to the maintenance area side.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sealing device for a through plug that can reliably seal the opening on the cell chamber side with a simple configuration.

The present invention corresponds to a through plug provided with an inner terminal projecting into the inside of a cell chamber, and is used when a through plug disposed in an opening provided in a cell wall that divides the cell chamber and a maintenance area is used for detachment. Sealing device for
Disposed in the cell chamber, a container body depth end has a smaller outer diameter than the inner diameter of the cell chamber side of the opening for accommodating the inner terminal is opened and the through plug is formed,
An annular tube seal provided on the outer periphery of the open end of the container body;
A through plug comprising a pressurized fluid supply device that supplies pressurized fluid to the tube seal and expands the tube seal to seal between the outer surface of the container body and the inner surface of the opening on the cell chamber side. The present invention relates to a sealing device for use.

  In the through plug sealing device, it is preferable that the container body is made of a radiation shielding material.

  The through plug sealing device preferably includes an insertion carriage that supports the container body and inserts / removes the open end of the container body with respect to the opening on the cell chamber side.

  In the through plug sealing device, the container body preferably includes a positioning guide for positioning when the open end portion is inserted into the opening on the cell chamber side.

  According to the sealing device for a through plug of the present invention, an excellent effect can be obtained that the opening on the cell chamber side can be reliably sealed with a simple configuration.

(a) is a perspective view which shows one Example of the sealing device for penetration plugs provided with the container main body of this invention, (b) is the half cross-sectional view which cut | disconnected the container main body of (a) along the axis line. It is a perspective view of an insertion carriage which supports a container body and inserts / removes an open end of the container body with respect to an opening on the cell chamber side. It is sectional drawing which shows the state before sealing the opening by the side of a cell chamber by the sealing apparatus for penetration plugs of this invention, and starting extraction of a penetration plug. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the sealing apparatus for penetration plugs which the present inventors proposed before this invention, (a) is a figure which shows the state before starting extraction of a penetration plug, (b) is (a). It is a figure which shows the state which pulled out only the predetermined distance and inserted the temporary shield in the cell chamber.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 4 shows an example of a through plug sealing device proposed by the present inventors before the present invention. As shown in FIG. 4, a cell room 2 that handles high-level radioactive waste and a maintenance area 3 that can be operated by an operator are partitioned by a cell wall 4. An opening 5 communicating with the area 3 is provided, and a through plug 6 is disposed through the opening 5. The cell wall 4 is made of a radiation shielding material such as concrete, and the opening 5 is formed by a through pipe 7 provided in the cell wall 4. The opening 5 formed by the penetrating tube 7 of FIG. 4 has a larger diameter in the maintenance area side opening 5 ″ than in the cell chamber side opening 5 ′.

  One end of the through plug 6 is provided with an inner terminal 8 that protrudes into the cell chamber 2 and is connected to a remote joint (not shown) provided in the cell chamber 2. The end is provided with an outer terminal 9 that protrudes into the maintenance area 3 and is connected to an outer joint (not shown) provided in the maintenance area 3. In FIG. 4, reference numeral 10 denotes a fixing tool that is fitted to the through plug 6 in the maintenance area 3 and fixes the through plug 6 to the cell wall 4 around the opening 5 ″ on the maintenance area side in an airtight state. The outer terminal 9 of the through plug 6 protrudes into the maintenance area 3 through the inside of the fixture 10.

  The maintenance area 3 is provided with a coupling device 11 coupled to the end of the through plug 6 so as to surround the outer terminal 9. Further, the maintenance area 3 includes a traveling carriage 12 that travels parallel to the cell wall 4 (in a direction orthogonal to the axis of the opening 5), a lifting table 13 that can be raised and lowered relative to the traveling carriage 12, and the coupling device. A through plug detaching device 15 is provided that includes a sampling base 14 that supports 11 and is movable relative to the lifting table 13 in the axial direction of the through plug 6.

  FIG. 4A shows a state before starting the extraction of the through plug 6, a cylindrical plastic bag 16 is arranged on the outer periphery of the through plug 6, and one end of the plastic bag 16 is airtight to the fixture 10. And the other end of the plastic bag 16 is hermetically attached to the coupling device 11 to seal the opening 5 "on the maintenance area side. That is, the opening 5" on the maintenance area side is sealed by the bag-in / bug-out method. ing. Further, in FIG. 4B, the through plug 6 is extracted from the state of FIG. 4A to the maintenance area 3 by a predetermined distance, and the inner terminal 8 is immersed in the opening 5 ′ on the cell chamber side. A temporary shield 17 provided in the cell chamber 2 is disposed so as to close 5 ′. However, in the method shown in FIG. 4, since the cell chamber 2 is maintained at a negative pressure, when the through plug 6 starts to be pulled out, the plastic bag 16 is crushed so as to be in close contact with the through plug 6, and thus the plastic bag. The operation of carefully pulling out the through plug 6 so that the 16 is not damaged becomes difficult. Moreover, when the vinyl bag 16 is damaged, there is a possibility that the cell chamber 2 cannot be held at a negative pressure. In addition, since the temporary shield 17 is simply disposed so as to cover the front surface of the opening 5 ′ on the cell chamber side, there is a gap between the temporary shield 17 and the cell wall 4. It is considered that the radiation in the cell chamber 2 flows out to the maintenance area 3 through the gap.

  In order to solve the above-mentioned problem in the method shown in FIG. 4, in FIG. 3, the cell chamber 2 is provided with a through plug sealing device 1 that hermetically seals the opening 5 ′ on the cell chamber side. .

  FIG. 1 shows details of the through plug sealing device 1 shown in FIG. 3, and this through plug sealing device 1 has an outer diameter smaller than the inner diameter of the opening 5 ′ on the cell chamber side. A container body 18 having one end opened is provided. An annular groove 20 (see FIG. 1B) is provided on the outer periphery of the open end 19 of the container body 18, and an annular tube seal 21 is disposed in the groove 20. The open end 19 of the container body 18 shown in FIG. 1 is a thick part 22 formed thicker than the other parts of the container body 18, and the outer periphery of the thick part 22 is the container body 18. A predetermined gap is formed between the outer surface of the thick wall portion 22 and the inner surface of the opening 5 ′ on the cell chamber side. The tube seal 21 is disposed in the groove 20 provided on the outer periphery of the thick portion 22.

  Further, in the through plug sealing device 1, a pressurized fluid is supplied to the tube seal 21 to expand the tube seal 21, thereby expanding the outer surface of the thick portion 22 of the container body 18 and the opening 5 'on the cell chamber side. A pressurized fluid supply device 23 is provided for sealing between the inner surface and the inner surface.

  In the pressurized fluid supply device 23, a fluid pipe 24 connected to a fluid supply source (not shown) is connected to an internal pipe 25 provided inside the container body 18, and the internal pipe 25 is connected to the inside of the container body 18. The tube seal 21 is connected through the thick portion 22. When pressurized fluid from a fluid supply source is supplied to the tube seal 21 through the fluid piping 24 and the internal piping 25, the tube seal 21 expands and adheres closely to the inner surface of the opening 5 ′ on the cell chamber side and the outer surface of the thick portion 22. When the cell chamber side opening 5 ′ is sealed, the supply of the pressurized fluid to the tube seal 21 is stopped, and the pressurized fluid is released to the fluid supply source side, the tube seal 21 is reduced, so that the container body 18 It becomes possible to move. For example, air can be used as the pressurized fluid for expanding the tube seal 21. Also, water or oil can be used as the pressurized fluid.

  The container body 18 is preferably made of a radiation shielding material. For example, the container body 18 can be made of a metal material such as aluminum, lead, or iron. Further, as shown in FIG. 3, the container body 18 is formed to a depth capable of accommodating the inner terminal 8 provided on the through plug 6 so as to protrude into the cell chamber 2.

  The tube seal 21 is preferably made of a material having durability against radiation or the like. The tube seal 21 can be manufactured using, for example, EPDM (ethylene propylene diene rubber).

  The container body 18 is provided with a positioning guide 26 for positioning when the open end 19 of the container body 18 is inserted into the opening 5 ′ on the cell chamber side. The positioning guide 26 includes centering guide members 26 a that protrude forward (in the cell wall 4 side) at a plurality of locations in the circumferential direction of the end surface 19 a of the open end 19 of the container body 18. The centering guide member 26a has an inclined surface whose outer surface gradually approaches the axis of the container body 18 toward each protruding tip, and the centering guide member 26a is formed in the opening 5 ′ on the cell chamber side. By entering, the axial center of the container main body 18 coincides with the axial center of the opening 5 ′ following the opening 5 ′. The positioning guide 26 is provided with a plurality of stopper guide members 26b protruding radially outward from the circumferential surface behind the thick portion 22 of the container body 18 (on the side of the opposite end surface 19a). When the open end portion 19 of the container body 18 is inserted into the opening 5 ′ on the cell chamber side, the stopper guide member 26b comes into contact with the cell wall 4, whereby the insertion length of the container body 18 with respect to the opening 5 ′ is defined. In FIG. 1, reference numeral 27 denotes a hanging bracket for lifting the container body 18.

  As shown in FIG. 2, the through plug sealing device 1 supports the container body 18 in the cell chamber 2 and inserts the open end 19 of the container body 18 into the opening 5 ′ on the cell chamber side. An insertion carriage 28 that is adapted to be removed is provided.

  The insertion carriage 28 shown in FIG. 2 is guided by a traversing base 30 that travels in the A direction along a rail 29 provided in parallel with the cell wall 4, and is raised and lowered in the B direction by being guided by a guide member 31 of the traversing base 30. Elevator base 32 whose height position can be adjusted by the above and below, and provided in the elevator base 32, the container main body 18 can be placed and moved back and forth along the guide 32a in the C direction parallel to the axis of the opening 5 A stand 33 is provided. The insertion carriage 28 on which the container body 18 is placed is normally moved away from the opening 5 of the cell wall 4 along the rail 29. When the through plug 6 is attached or detached, the insertion carriage 28 is opened on the cell chamber side. When moved to the front surface of 5 ', the axial center of the container body 18 coincides with the axial center of the opening 5'.

  Next, the operation of the above embodiment will be described.

  When the cell chamber 2 shown in FIG. 4A handles high-level radioactive substances, a remote joint (not shown) is connected to the inner terminal 8 of the through plug 6, and an outer side (not shown) is connected to the outer terminal 9 of the through plug 6. The joint is connected.

  When extracting the through plug 6 from the opening 5 of the cell wall 4 for inspection or replacement of the through plug 6, the remote joint is removed from the inner terminal 8 of the through plug 6 and the outer terminal 9 of the through plug 6 is removed. Remove the outer joint.

  Further, the coupling device 11 supported by the through plug detaching device 15 is attached to the end of the through plug 6 from which the outer joint has been removed, as shown in FIG. And the cylindrical plastic bag 16 is arrange | positioned on the outer periphery of the penetration plug 6, and while attaching one end of the plastic bag 16 to the fixing tool 10 fixed to the cell wall 4, the other end of the plastic bag 16 is connected to the said coupling device. 11 and the maintenance area side opening 5 ″ is sealed with a plastic bag 16.

  On the other hand, the insertion carriage 28 shown in FIGS. 2 and 3 is moved to the front surface of the opening 5 ′ on the cell chamber side so that the axis of the container body 18 supported by the insertion carriage 28 is aligned with the opening 5 ′ on the cell chamber side. Match the axis.

  Next, the back-and-forth moving base 33 of the insertion carriage 28 is advanced so as to approach the cell wall 4, and the open end 19 of the container body 18 is inserted into the opening 5 ′ on the cell chamber side. At this time, since the outer diameter of the open end 19 of the container body 18 is smaller than the inner diameter of the opening 5 ′ on the cell chamber side, the open end 19 can be easily inserted into the opening 5 ′ on the cell chamber. The Furthermore, since a plurality of alignment guide members 26a are provided on the end surface 19a of the open end 19 of the container body 18, the center of the container body 18 and the axis of the opening 5 'on the cell chamber side are shifted. Even if there is, the container body 18 is inserted into the opening 5 ′ following the opening 5 ′ on the cell chamber side. Further, since a plurality of stopper guide members 26b projecting radially outward are provided on the peripheral surface of the container body 18, the stopper guide member 26b is inserted when the open end 19 of the container body 18 is inserted into the opening 5 '. Is brought into contact with the cell wall 4 so that the insertion length of the container body 18 with respect to the opening 5 'is automatically defined.

  When the open end 19 of the container body 18 is inserted into the opening 5 ′ on the cell chamber side, the pressurized fluid supply device 23 shown in FIG. 1 is operated, for example, air from a fluid supply source provided in the maintenance area 3 The pressurized fluid is supplied to the tube seal 21 provided on the outer periphery of the open end 19 of the container body 18 through the fluid pipe 24 and the internal pipe 25. The tube seal 21 expands when a pressurized fluid is supplied, and is in close contact with the outer surface of the open end 19 of the container body 18 and the inner surface of the opening 5 ′ on the cell chamber side, and seals the opening 5 ′ on the cell chamber side. . All the operations inside the cell chamber 2 are performed by remote control.

  As described above, when the sealing of the opening 5 ″ on the maintenance area side and the sealing of the opening 5 ′ on the cell chamber side are completed, the extraction table 14 provided in the through plug detaching device 15 is operated to open the through plug 6 into the opening 5. Do the work of removing from the.

  At this time, as shown in FIG. 3, the opening 5 ′ on the cell chamber side is sealed by the container body 18, so that the negative pressure in the cell chamber 2 acts on the opening 5 when the through plug 6 is pulled out. Absent. Therefore, since the plastic bag 16 is not crushed so as to be in close contact with the through plug 6 due to negative pressure, the work of pulling out the through plug 6 is facilitated and the problem that the plastic bag 16 is damaged can be reduced. Further, when the container body 18 is made of a radiation shielding material, it is possible to prevent a problem that the radiation in the cell chamber 2 flows out to the maintenance area 3 through the opening 5.

  As described above, the through plug sealing device 1 according to the present invention has a container body 18 having an outer diameter smaller than the inner diameter of the cell chamber side opening 5 ′ and one end opened, and the cell chamber side opening 5 ′. The pressurized fluid is supplied to the tube seal 21 provided on the outer periphery of the open end 19 of the container main body 18 to expand the tube seal 21 to open the outer surface of the container main body 18 and the opening 5 on the cell chamber side. Since the pressurized fluid supply device 23 that seals between the inner surface of 'is provided, the opening 5' on the cell chamber side can be reliably sealed with a simple configuration.

  Since the container body 18 is made of a radiation shielding material, it is possible to prevent a problem that the radiation in the cell chamber 2 flows out to the maintenance area 3 through the opening 5.

  Since the container body 18 is supported and the insertion carriage 28 for inserting / removing the open end 19 of the container body 18 into / from the cell chamber side opening 5 ′ is provided, the cell body side opening 5 ′ is provided. The operation | work which attaches / detaches the container main body 18 can be performed easily.

  The container body 18 includes a positioning guide 26 for positioning when the open end portion 19 is inserted into the cell chamber side opening 5 ′. Therefore, the open end portion 19 of the container body 18 is connected to the cell chamber side opening 5 ′. The container body 18 can be easily positioned with respect to the opening 5 'on the cell chamber side only by being inserted toward'.

  The through plug sealing device of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Sealing device for penetration plugs 2 Cell chamber 3 Maintenance area 4 Cell wall 5 Opening 5 'Opening on the cell chamber side 6 Through plug
8 Inner terminal 18 Container body 19 Open end 21 Tube seal 23 Pressurized fluid supply device 26 Positioning guide 28 Insertion carriage

Claims (4)

A through plug sealing device that corresponds to a through plug having an inner terminal protruding into the cell chamber and is used when a through plug disposed in an opening provided in a cell wall that divides the cell chamber and a maintenance area is used for detachment. There,
Disposed in the cell chamber, a container body depth end has a smaller outer diameter than the inner diameter of the cell chamber side of the opening for accommodating the inner terminal is opened and the through plug is formed,
An annular tube seal provided on the outer periphery of the open end of the container body;
A through plug comprising a pressurized fluid supply device that supplies pressurized fluid to the tube seal and expands the tube seal to seal between the outer surface of the container body and the inner surface of the opening on the cell chamber side. Sealing device.   The through-plug sealing device according to claim 1, wherein the container body is made of a radiation shielding material.   The through plug sealing device according to claim 1 or 2, further comprising an insertion carriage that supports the container body and inserts / removes the open end of the container body with respect to the opening on the cell chamber side. .   The through-plug seal according to any one of claims 1 to 3, wherein the container body includes a positioning guide for positioning when the open end portion is inserted into the opening on the cell chamber side. apparatus.

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