JP2002131463A - Mending method for electric-wiring penetration part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mending method, for an electric-wiring penetration part, in which the airtight performance of the electric-wiring penetration part can be restored without replacing a penetration module. SOLUTION: In a state that the penetration module 7 is mounted on a header plate 6, one end of a sleeve 15 is attached to the end part at the outside of the penetration module 7, the other end of the sleeve 15 is attached to electric wires 4 which protrude from the penetration module 7, the end part of the penetration module 7 is covered with the sleeve 15, a mending seal material 18 is injected into the sleeve 15, and the airtightness of the penetration module 7 is mended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing an airtight portion of an electric wiring penetrating portion, which penetrates an airtight container and guides electric wires from the outside to the inside of the sealed container to repair the airtightness of the electric wiring penetrating portion.

[0002]

2. Description of the Related Art For example, in a closed vessel such as a reactor containment vessel, in order to electrically measure the internal process amount,
The wires penetrate the reactor containment and are led into the interior. In this case, in order to maintain the hermeticity of the containment vessel, the electric wires are routed from the outside to the inside of the containment vessel through the electric wiring penetration portion.

FIG. 4 is a cross-sectional view showing a state where the electric wiring penetration portion 2 is installed in the reactor containment vessel 1. That is,
The electric wiring penetration part 2 is provided to penetrate an electric wire through the wall of the containment vessel 1. FIG. 5 shows the details of the electric wiring penetrating portion 2.

A penetration sleeve 1 is provided on the wall of the containment vessel 1.
5 are provided through the wall, and terminal boxes 5 for processing the electric wires 4 are provided at both ends of the penetrating sleeper 3 respectively. Further, a header plate 6 is formed by welding at an end of the penetration sleep 3 located outside the reactor containment vessel 1.

[0005] A penetration module 7 is fitted and sealed in the header plate 6. The penetrating module 7 is provided with an electric wire 4, and is connected to an external cable (not shown) at a terminal box 5 attached to a header plate 6.

FIG. 6 is a detailed sectional view of the penetrating module 7. The penetrating module 7 is fitted and sealed to the header plate 6 of the penetrating sleeve 15 via an O-ring 8. A leak monitor space 11 is formed in the central portion of the module body 9 of the penetration module 7 by a filler plate 10, and both sides of the penetration wire 12 connected to the wire 4 are sealed with sealing materials 1.
3 is a sealed structure. The leak monitor space 11 is arranged at a position of a leak monitor port 14 provided in the module body 9.

The electric wiring penetration portion 2 of the containment vessel 1
With such a configuration, the airtight performance is performed by monitoring from the leak monitor port 14 whether the airtightness between the sealing material 13 and the electric wire 4 has been impaired. In the event that a problem occurs in the airtight performance, a method is adopted in which the penetration module 7 attached to the header plate 6 is removed and replaced with a new one.

[0008]

However, in the event that the airtightness of the electrical wiring penetration portion of the containment vessel is adversely affected, if a replacement penetration module is not prepared,
It takes time to prepare. Further, replacement of the penetration module 7 requires disconnection of the connection with the external cable once, and it takes time to perform replacement work such as removal, reconnection, and confirmation of circuit connection. Therefore, there is a risk that the radiation dose of the workers may be increased accordingly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for repairing a through-hole of an electric wiring, which can recover airtight performance without replacing a through-module.

[0010]

According to a first aspect of the present invention, there is provided a method for repairing a through portion of an electric wiring, comprising: a penetrating sleeve penetrating the inside and the outside of a closed container; A method for repairing an electric wire penetration portion that, when the air tightness of the electric wire penetration portion, which is formed by penetrating the electric wire and sealing with a sealing material and having a leak monitor space in the middle thereof is impaired, is repaired. The end of the penetration module is covered with a sleeve at one end of the penetration module while including the electric wire coming out of the penetration module while the penetration module is attached to the header plate, and a repair sealing material is provided inside the sleeve. Injection is performed to repair the airtightness of the penetration module.

In the method for repairing a through portion of an electric wiring according to the first aspect of the present invention, one end of a sleeve is attached to an outer end of the through module while the through module is mounted on the header plate. The end is attached to the electric wire coming out of the penetrating module, the end of the penetrating module is covered with a sleeve, and a repair sealing material is injected into the sleeve to repair the airtightness of the penetrating module.

According to a second aspect of the present invention, there is provided a method for repairing a through portion of an electric wiring, wherein one end of the sleeve is fixed to an end of the through module by using a fixing tool. The other end is fixed to the electric wire using a fixing tool, and a sealing material for repair is injected into the sleeve to repair the airtightness of the penetration module.

According to a second aspect of the present invention, in addition to the function of the first aspect, the end of the sleeve is fixed to the end of the penetrating module using a fixing tool. Is fixed to the electric wire using a fixture. Then, a sealing material for repair is injected into the sleeve to repair the airtightness of the penetrating module.

According to a third aspect of the present invention, there is provided a method for repairing a through portion of an electric wiring according to the first or second aspect of the present invention.
After the repair sealing material is injected into the sleeve, the leak monitor space inside the penetration module is evacuated to repair the airtightness of the penetration module.

According to a third aspect of the present invention, there is provided a method for repairing a through portion of an electric wiring, wherein in addition to the operation of the first or second aspect, after a sealing material for repair is injected into the inside of the sleeve, the inside of the through module is repaired. The leak monitor space is evacuated so that the injected repair seal material spreads between the electric wires inside the module body of the penetration module and the repair seal material.

According to a fourth aspect of the present invention, there is provided a method of repairing a through portion of an electric wiring according to the first or second aspect of the present invention.
After the repair sealing material is injected into the inside of the sleeve, the inside of the sleeve is pressurized to repair the airtightness of the penetration module.

According to a fourth aspect of the present invention, there is provided a method of repairing a through portion of an electric wire, in addition to the operation of the first or second aspect of the present invention, after the repair sealing material is injected into the inside of the sleeve, the inside of the sleeve is repaired. Pressure is applied so that the injected repair seal material spreads between the electric wires inside the module body of the penetration module and the repair seal material.

According to a fifth aspect of the present invention, there is provided a method for repairing a through portion of an electric wiring according to any one of the first to fourth aspects, wherein the repair sealing material injected into the sleeve has a strength of 5 MPa or more. And a repair seal material to which a plasticizer is added so that the elongation characteristic becomes 50% or more.

According to a fifth aspect of the present invention, there is provided a method of repairing a penetrating portion of an electric wiring, wherein in addition to the function of any one of the first to fourth aspects, a plasticizer is added so that
Since the sealing material for repair has an elongation property of 50% or more at a pressure of not less than MPa, it is possible to improve the permeability to the peeled portion and maintain the airtightness for a long time.

[0020]

Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view of an electric wiring penetrating part for describing a method of repairing the electric wiring penetrating part according to the first embodiment of the present invention.

The header plate 6 of the containment vessel 1 is provided with an O-ring 8
To seal the containment vessel 1.
A through wire 12 connected to the electric wire 4 penetrates through the module body 9, a leak monitor space 11 is formed at the center by a sealing plate 10, and both sides are sealed with a sealing material 13. The leak monitor space 11 is arranged at a position of a leak monitor port 14 provided in the module body 9.

In repairing such an electric wire penetrating portion 7, a sleeve 15 is attached to a module body 9 at an outer outlet portion of the containment vessel 1 by a fixture 16. Then, the repair sealing material 18 is filled into the sleeve 15 from the injection port 17 provided in the sleeve 15. Thereafter, the repairing sealing material 18 is sufficiently penetrated between the sealing material 13 inside the module body 9 and the electric wire 4 and cured to complete the repairing. Therefore, even if the airtightness of the reactor containment vessel 1 is impaired, the airtight performance can be easily restored.

Next, a second embodiment of the present invention will be described. FIG. 2 is a cross-sectional view of an electric wiring penetrating portion for describing a method of repairing the electric wiring penetrating portion according to the second embodiment of the present invention.

In the second embodiment, after the sleeve 15 is attached to the module body 9, the leak monitor space 1
In this method, the sealing material 18 for repairing filled in the sleeve 15 penetrates into the leak path formed in the sealing material 13 by drawing a vacuum from 1 to more reliably restore the sealing function. Instead of applying a vacuum, the sleeve 15 may be filled with the repair sealing material 18 and then pressurized from the sleeve 15 side.

For these repairs, the repair seal 18 is selected from those having the following characteristics based on the handleability of the repair seal 18 at the time of repair, the permeability to the leak path and the gap between the electric wires 4, and the like. It is necessary.

In order to obtain a repair effect, the repair sealing material 18 is required to have flexibility and strength. Flexibility is an important property for having an airtight function. When a repair seal material having a large elastic modulus is selected, it is excellent in static force, but is much weaker against impact. If the elongation characteristic, which is an index of flexibility, is less than 50%, peeling and cracking tend to occur. Further, since the progress is fast, the airtight function is lost in a short period of time after peeling and cracking. On the other hand, strength is an important property in performing the function as a structural material,
If it is lower than a, the wire cannot be supported, and the structural function is lost.

FIG. 3 is an explanatory view of a range of a repair sealing material used in the present invention. As shown in FIG. 3, since the strength and the elongation are contradictory depending on the added amount of the plasticizer, a repair sealant in a region where both properties are balanced is used. That is, a material having a strength of 5 MPa or more and an elongation property of 50% or more is selected.

The properties of the repair seal 18 can be obtained by adjusting the addition of a plasticizer. In addition, by adding a plasticizer to obtain such properties,
Since the pot life can be prolonged and the viscosity can be reduced, workability and permeability to the peeling portion can be improved.

As described above, since the airtight repair is performed by adding the repair seal material to the outer exit portion of the containment vessel of the penetration module, even if any abnormality occurs in the airtight performance, the sealing function is provided. Can be easily recovered.

In addition, since the work can be performed at the position where the penetrating module 7 is installed in the electric wiring penetrating portion 2, the work can be performed without removing the connected electric wire.

[0031]

As described above, according to the method for repairing the electric wiring penetration portion of the present invention, a seal abnormality (leakage) occurs in the electric wiring penetration portion of the reactor containment vessel which is a closed vessel. Even in this case, the repair can be performed quickly and easily. Further, since it is not necessary to release the connection at the time of construction, the radiation exposure dose of the worker can be reduced. Further, since the leak monitor space can be maintained, it is possible to detect the presence or absence of the leak even after the repair.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electric wiring penetration part for describing a method of repairing the electric wiring penetration part according to the first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an electric wiring penetrating part for describing a method of repairing the electric wiring penetrating part according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a range of a repair sealing material used in the present invention.

FIG. 4 is a cross-sectional view showing an installed state of the electric wiring penetration portion of the containment vessel.

FIG. 5 is a sectional view of an electric wiring penetration portion of the containment vessel.

FIG. 6 is a cross-sectional view showing a structure of a penetration module of an electric wiring penetration portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor containment vessel, 2 ... Electric wiring penetration part, 3 ... Penetration sleeve, 4 ... Electric wire, 5 ... Terminal box, 6 ... Header plate,
7 ... penetrating module, 8 ... O-ring, 9 ... module body, 10 ... filler plate, 11 ... leak monitor space, 12
... penetrating wire, 13 ... sealing material, 14 ... leak monitor port,
15 ... sleeve, 16 ... fixture, 17 ... injection port, 18 ...
Repair seal material

Claims (5)

[Claims] 1. A penetrating module which penetrates the inside and outside of a sealed container, and a penetrating module which is mounted on a header plate of the penetrating sleeve, penetrates an electric wire inside, seals with a sealing material, and has a leak monitor space in between. When the airtightness of the electric wiring penetrating part is impaired, in a method of repairing the electric wiring penetrating part for repairing the airtightness, the one end of the penetrating module with the penetrating module mounted on the header plate Electrical wiring, wherein an end of the through module including an electric wire coming out of the through module is covered with a sleeve, and a sealing material for repair is injected into the inside of the sleeve to repair the hermeticity of the through module. How to repair the penetration. 2. An end of the sleeve is fixed to an end of the through module using a fixing tool, and the other end of the sleep is fixed to an electric wire using a fixing tool, and a repair seal is provided inside the sleeve. The method for repairing a through portion of an electric wiring according to claim 1, wherein a material is injected to repair the airtightness of the through module. 3. The airtight repair of the penetration module is performed by evacuating the leak monitor space inside the penetration module after injecting the repair sealing material into the inside of the sleeve. Alternatively, the method for repairing a through portion of an electric wiring according to claim 2. 4. The airtight repair of the penetrating module is performed by pressurizing the inside of the sleeve after injecting the repair sealing material into the inside of the sleeve.
Alternatively, the method for repairing a through portion of an electric wiring according to claim 2. 5. A repair sealing material to which a plasticizer is added so as to have a strength of 5 MPa or more and an elongation characteristic of 50% or more is used as the repair seal material injected into the sleeve. The method for repairing a through portion of an electric wiring according to any one of claims 1 to 4.