JPH0473759B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wall penetrating device, and particularly to a device for penetrating a wall made of concrete or the like to prevent the penetration of electric wires, pipes, etc. into close contact with the shielding wall and the passage of radiation. The present invention relates to a method of assembling a wall penetrating device for a nuclear reactor suitable for use in a nuclear reactor.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 53-146089, a conventional device of this type has a radiation shielding material filled inside, and a cable, for example, is arranged in an eccentric spiral shape through the shielding material. ing.

Further, in Japanese Patent Application No. 87207/1987 filed by the present applicant, an electric wire formed by applying an insulating material to the outer periphery of a conductor and covering the outer periphery with a metal tube is passed through the filling material.

[Problem that the invention seeks to solve]

The conventional device described above has a structure in which the electric wire is routed through the radiation shielding material, and the electric wire and the shielding material are in direct contact with each other. but,
With this structure, when the wire generates heat due to electricity, the thermal expansion of the wire is restrained by the shielding material around the conductor, so large thermal stress acts on the boundary between the conductor and the insulator, especially in the axial direction of the conductor. There is a risk of insulation breakdown. As a method for preventing this, a common practice is to provide a gap between the electric wire and the shielding material and arrange the electric wire in a flexible manner. However, when a gap is provided between the shielding material and the electric wire, there is a problem that radiation passes through the gap.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above, and it is an object of the present invention to provide a method for assembling a wall penetrating device that can simultaneously solve the problems of expanding and contracting electric wires and the like and preventing the passage of radiation.

[Means for solving problems]

The structure of the present invention adopted to achieve the above object includes a container that houses one or more electric wires etc. and penetrates a radiation shielding wall, and a slurry-like or granular radiation shield filled inside the container. In a method for assembling a wall penetrating device made of a material, electric wires, etc. passing through the radiation shielding material are each inserted into a straight pipe having an inner diameter larger than an outer diameter of the electric wires, one end of which is fixed to the container in advance, within a predetermined gap. a step of twisting the straight pipe into a coil shape in the axial direction and twisting it back in the opposite direction at an appropriate interval to place the vessel; This method is characterized by the step of sealingly fixing it to a wall surface and drawing out internal electric wires and the like after sealing the outer periphery of the container.

[Effect]

In the method for assembling the wall penetrating device of the present invention, the work of inserting the electric wire into the pipe is performed while the pipe is in a straight shape, and then the straight pipe is twisted into a coil shape, so that it is possible to some extent. Even when wires with poor flexibility are used, the wire insertion work is easy and reliable.

In the wall penetrating device assembled in this way,
Electric wires, etc. expand in both diameter and length due to thermal expansion.
However, this expansion is absorbed by the gap between the inner circumferential surface of the pipe and the outer circumferential surface of the electric wire, etc., so that the pipe is not constrained and generates large thermal stress. Since the ends are arranged so that each end has a twisted part in the opposite direction, the gap between the pipe and the electric wire, etc. is not straight and cannot be seen, so radiation passes through the gap. There is no fear.

〔Example〕

The present invention will be explained in detail below with reference to FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional view showing a wall penetrating device assembled according to an embodiment of the present invention, and shows a state in which electric wires penetrate the wall of a reactor vessel chamber. In FIG. 1, 1 is a reactor vessel chamber wall, 2 is a through hole, and a container 3 containing an electric wire 4 is inserted and attached to the through hole 2 provided in the wall 1. container 3
Inside, one or more electric wires and a pipe 5 having an inner diameter larger than the outer diameter of the electric wire 4 through which the electric wire 4 is passed are provided, and one end of the pipe 5 is connected to a plate 6 on the wall 1 side that is integral with the container 3. The outer periphery is fixed by, for example, welding. A support 7 for supporting the pipe 5 is provided at the center of the container 3, and a support 8 for supporting the pipe 5 is provided at the opposite end of the container 3 from the plate 6. A space surrounded by the support 8 is filled with a shielding material 12 such as concrete. Reference numeral 9 denotes an end plate provided with a through hole for the electric wire 4 integral with the container 3, and 10 is an airtight plate provided with a through hole for the electric wire 4 that is airtightly fixed to the container 3 by, for example, welding. The space between the electric wire 4 that has passed through the airtight plate 10 and the airtight plate 10 is sealed with an airtight seal body 11.
1 and a seal plate 15 for sealing between the container 3 and the wall 1, the space between the right side and the left side of the wall 1 is made airtight. End portion 13 provided in the through hole of end plate 9
is, for example, a termination portion that provides insulation between the electric wire 4, the conductor, and the insulating portion, and hermetically seals the end portion of the electric wire 4. Note that when a tube is used instead of the electric wire 4, a connecting joint is used as the end portion 13. A core wire 14, which is a conductor, comes out from the end portion 13 and is connected to an external electric wire or the like.

Next, a method of assembling the wall penetrating device having the above structure will be explained. First, the small diameter portion 3' of the container 3 is separated at the connecting portion 3''. Then, one end of the pipe 5 is fixed to the plate 6 by, for example, welding so that the outer periphery is airtight. 5
is a straight line. Next, the airtight plate 10 is fixed to the end surface of the reactor vessel chamber side of the vessel 3 to form an airtight structure by welding or the like. At this time, the plate 6 and the airtight plate 10 are fixed so that the through holes 6' and 10' of the electric wire 4 are aligned on the same axis. Next, the electric wire 4 is inserted into the pipe 5 inside the container 3 from the airtight plate 10 side. At this time, the airtight seal body 11 is placed on the airtight plate 10 side.
and seal the electric wire 4. However, end face 9
This edge treatment is not performed on the side. After inserting the electric wire 4, the support 7 is inserted into the container 3 through the pipe 5, rotated clockwise by a predetermined angle, and fixed to the container 3 at the axial center of the container 3 by welding or the like. As a result, the pipe 5 is twisted together with the electric wire 4 in a spiral shape. When the work has been completed up to this point, the entire apparatus is erected vertically, and a shielding material (hereinafter referred to as filler) 12, such as concrete, is filled through the filling hole 7' provided in the support 7. Next, the small diameter part 3' is connected by welding at the connecting part 3'' as shown in the figure, and the support 8 is connected to the pipe 5.
Insert it into the container 3 so that the support 8
is rotated by a predetermined angle in a direction opposite to the direction in which the support 7 was rotated, for example, counterclockwise, and is fixed by welding or the like toward the outside of the small diameter portion 3'. As a result, the pipe 5 is twisted in a spiral shape together with the electric wire 4 in the opposite direction to that when the support 7 is rotated.

FIG. 2 is a sketch showing one embodiment of the twisted state of the pipe.

After fixing the support 8, the end portion 13 of the electric wire 4 on the end plate 9 side is insulated, and the end plate 9 is attached to the small diameter portion 3'.
be fixed by welding. Then, filler material 1 is passed through filling hole 9' of end plate 9 and filling hole 8' of support 8.
Fill 2. The above is inserted into the through hole 2 provided in the reactor vessel chamber wall 1 from the reactor vessel chamber side, and the space between it and the wall 1 is made airtight by the seal plate 15.

An embodiment of the method for assembling the wall penetrating device of the present invention has been described above. In the method for twisting the pipe 5, the support 7 is first fixed to the container 3,
Next, the plate 6 and the support 8 may be fixed to the container 3 by rotating them by a predetermined angle in the same direction, and the pipe 5 can be twisted in the same way.

In this method of assembling a wall penetrating device, the wire is inserted into the pipe while the pipe is straight, so even if the wire is used with some degree of inflexibility, the wire can be inserted. Easy and sure.

In particular, radiation-resistant cables (wires) used in nuclear power plants have poor flexibility and are difficult to insert unless this method is used.

Further, the greater the thickness of the wire passing through the wire, the worse the flexibility, so the effect in such a case is great and it can be used regardless of the properties of the wire.

According to the embodiment of the present invention described above, by providing the pipe 5 on the outer periphery of the electric wire 3, direct contact between the electric wire 4 and the shielding material 12 can be prevented, and in particular, when the shielding material 12 such as concrete is filled. In this case, the wire 4 is stuck to the concrete.
It is possible to completely prevent the thermal expansion of In addition, since the pipes 5 are twisted spirally in opposite directions with almost the middle as a boundary, the electric wires 4
The structure is such that the gap between the pipe 5 and the pipe 5 cannot be directly seen, and radiation can be prevented from directly passing through this gap.

In the above-described embodiment, the case where the electric wire 4 is passed through has been described, but the case where the electric wire 4 is passed through can be similarly implemented with some exceptions, and the same effect can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, when an electric wire or the like is passed through a container filled with a shielding material for shielding radiation, the electric wire or the like can be penetrated without restricting the thermal expansion thereof, and This has the effect of preventing radiation from passing through.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a wall penetrating device assembled according to an embodiment of the present invention, and FIG. 2 is a sketch showing an embodiment of the twisted state of the pipe shown in FIG. 1...Wall, 2...Through hole, 3...Container, 4...
Electric wire, 5...pipe, 6...board, 7, 8...support, 11...airtight seal body, 12...shielding material.

Claims (1)

[Claims] 1. A method for assembling a wall penetrating device comprising a container for penetrating a radiation shielding wall that houses one or more electric wires, etc., and a radiation shielding material in the form of slurry or granules filled inside the container. the step of inserting each electric wire or the like that passes through the radiation shielding material into a straight pipe having an inner diameter larger than the outer diameter of the electric wire or the like, one end of which is fixed in advance to the container, with a predetermined gap; A step of twisting the straight pipe into a coil shape in the axial direction, twisting it back in the opposite direction at appropriate intervals, and arranging it, and sealingly fixing the container to the side wall of the reactor, and removing internal electric wires, etc. A method for assembling a wall penetrating device, comprising the steps of: sealing the outer periphery of the container to the container and drawing it out. 2. The step of arranging the straight pipe includes a straight pipe having one end fixedly arranged on the first support fixed to the container, and a second support provided with a through hole for the pipe. a step of rotating the second support in the circumferential direction after inserting the second support, and inserting a third support provided with a through hole for the pipe at the end of the container, and then rotating the third support. 2. The method of assembling a wall penetrating device according to claim 1, comprising the step of rotating the second support in a direction opposite to that of the second support.