JP2010060430A - Cable module of electrical wiring penetration part of nuclear reactor containment vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable module of the electrical wiring penetration part of a nuclear reactor containment vessel capable of eliminating a pressure-leak test in the electrical wire replacement of the nuclear reactor containment vessel and replacing the electrical wire while maintaining the air-tightness. <P>SOLUTION: The cable module of the electrical wiring penetration part of a nuclear reactor containment vessel includes: a tube shaped body 11 arranged penetrating through the nuclear reactor containment vessel wall 1a as a header plate; a plurality of wire-shaped conductors 40 disposed along the shaft center in the body; a plurality of potting boards 37 for supporting these conductors to the radial direction with intervals; an adhesive seal member 43 disposed surrounding the conductors in the body; and a pair of caps 44 disposed between these seal members with a space part for monitoring the leak and capable of closing the both ends of the body and leading out a plurality of electric wires connected to the conductors, wherein the body 11, the plurality of potting boards 37, the plurality of conductors 40 and the seal member 43 are constituted as an integral body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reactor containment vessel electric wire penetration part to be attached to a reactor containment vessel wall, and more particularly to a cable module of a nuclear reactor containment vessel electric wire penetration part called a cable penetration.

  Reactor containment electrical wiring penetrations may impair their electrical performance and performance as a containment pressure boundary for electrical circuits such as signals, instrumentation, control and power that penetrate the reactor containment. It is equipment that aims to penetrate the reactor containment vessel.

  In this reactor containment vessel electrical wiring penetration portion, generally, a header plate that closes the sleeve is provided at the tip of the sleeve that penetrates the reactor containment vessel, and a cable module that is attached through the header plate is provided. It is established by achieving airtightness and penetration of electric wiring at the same time.

  In the prior art, both ends of a long metallic module type body are closed by a pair of closing plates, and a pair of potting boards is provided in the center of the body. The space between the potting boards is used as a leak detection space, and a leak detection hole communicating with the space is provided on the side surface of the body.

  A plurality of conductors are supported on the potting board, and electric wires are supported on both ends of the conductors via sockets. A sealing material is provided in the body so as to surround the conductor, the socket, and the electric wire. An electric wire is led out from the pair of closing plates. Modular cable modules are fully assembled and tested in the factory.

  In the prior art, as shown in FIG. 2, male threads are formed on the outer surfaces of both ends of the body. A fastening member having a female screw is connected to the male screw by screwing. A pair of long seal cases are provided on the inner surface of the body, and a male screw is formed on the outer end of the seal case. A cap having a female screw is connected to the male screw by screwing.

  When replacing the wire, it is necessary to remove the cap, but the outer seal member can be inserted and removed between the outer potting board and the closing plate and over the entire inner surface of the seal case. Then, there is a possibility that sufficient airtightness for constructing the reactor containment pressure boundary is not maintained.

  If the wire is damaged or deteriorated during the use of the equipment for a long time, the electrical characteristics are lowered and the function cannot be maintained. For this reason, in the case of the prior art, it was necessary to remove the entire facility from the reactor containment vessel and repair or replace it, or to remove the cap and replace the electric wire.

  In the prior art, since the reactor containment pressure boundary is destroyed when the entire equipment including the electric wire or the electric wire is replaced, it is necessary to confirm that a healthy containment pressure boundary is formed at the time of restoration.

  For this confirmation, it is necessary to perform a pressure-resistant leak test by placing a dedicated pressure-resistant test vessel on the outside of the reactor containment electrical wiring penetration, and before connecting the wires or wires to other equipment. There was a need.

Furthermore, this pressure leak test and the production, installation, and removal of a dedicated pressure test container require a long on-site work, and there has been a possibility of radiation exposure for workers and test inspectors.
Japanese Patent Laid-Open No. 11-153688

  In the cable module of the reactor containment electrical wiring penetration portion, since the cable module and the electric wire are generally not separable, it is necessary to remove the cable module from the header plate when exchanging the electric wires.

  Moreover, in the prior art, the electric wire can be separated from the cable module. However, since the electric wire, the sealing material, the conductor, etc. are screwed to the body, the airtightness is maintained when the electric wire is separated from the cable module. There was a possibility of becoming impossible.

  For this reason, in the conventional general cable module, after exchanging an electric wire, the pressure-proof leak test was required for airtightness confirmation.

  The present invention has been made in view of such circumstances, and it is possible to eliminate a pressure-resistant leak test in the exchange of electric wires in the reactor containment vessel electric wiring penetration portion, and to replace the electric wires while maintaining airtightness. It is an object of the present invention to provide a cable module for a nuclear reactor containment electrical wiring penetration.

  In order to achieve the above-mentioned object, in the present invention, a tubular body penetrating the reactor containment vessel wall as a header plate and a plurality of linear shapes disposed in the body along the axial direction thereof. A conductor, a plurality of potting boards that support the conductors at an interval in the radial direction, an adhesive seal member that surrounds the conductor and is disposed in the body, and a gap between the seal members A pair of caps that are arranged with a space for leak monitoring and that can close out both ends of the body and lead out a plurality of wires connected to the conductor; and the body and the plurality of pottings Provided is a cable module for a reactor containment electrical wiring penetrating portion, characterized in that a board, the plurality of conductors, and the sealing member are integrally formed.

  According to the present invention, it is possible to replace the electric wire while maintaining the airtightness by eliminating the pressure leakage leak test in the electric wire replacement of the reactor containment electrical wiring penetration part, and even during the electric wire replacement work, the seal is maintained. The performance can be maintained and the pressure leak test after the wire replacement is not necessary.

  Also, when replacing the entire reactor containment electrical wiring penetration, a pressure leak test after replacement is essential, but since the wire portion can be separated from the body portion, the wire portion and the body portion are separated in advance. By doing so, the connection between the in-plant wiring and the electric wire 42, which has been performed after the conventional pressure leak test, can be performed in parallel with the pressure leak test, and the working time and exposure can be reduced.

  Hereinafter, an embodiment of a cable module according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, in the cable module 34 of the present embodiment, a potting board 37 is installed in the center portion of the body 35, and supports a plurality of conductors 40 penetrating the closing plate 36 in a predetermined arrangement. A leak monitoring space 38 is formed. The leak monitoring space 38 communicates with an external instrumentation system (not shown) through a leak detection hole 39 provided in the body 35.

  The closing plate 36 is installed apart from the potting board 37 in the vicinity of both ends of the body 35 to form a pair of spaces, and this space is filled with a sealing material 43 having adhesiveness.

  The sealing material 43 firmly bonds and bonds the body 35, the potting board 37, the conductor 40, and the closing plate 36 due to the adhesiveness thereof, so that they cannot be integrally separated, and each space separated by the sealing material 43 is retained. Has the function of keeping airtight.

  A cap 44 is installed on both outer sides of the body 35 via a gasket 46, and is coupled to the body 35 by a nut 45 that is rotatably installed on the cap 44 via a retaining ring 47. The nut 45 and the body 35 are coupled by screws or bayonet coupling.

  A potting board 37 is installed in the cap 44, and the electric wire 42 is supported in the same arrangement as the conductor 40. The electric wire 42 penetrates the potting board 37 and the contact 41 is connected thereto. The contact 41 and the electric wire 42 are detachably connected, but the contact 41 and the conductor 40 are detachable.

  The space in the cap 44 is filled with a sealing material 43 having adhesive properties so as to surround the electric wires 42, the potting board 37, and the contacts 41, and is formed so as not to be integrally separated.

  When replacing the deteriorated electric wire 42 of the cable module 34 having the above-described configuration, a normal electric wire 42, a cap 44, a potting board 37, and a contact 41 are previously integrated with a sealing material 43. Prepare and release the coupling between the nut 45 and the body 35. Next, the nut 45 and the retaining ring 47 are removed from the cap 44 and attached to the wire portion. Further, the nut 45 and the body 35 are re-coupled by a reverse procedure in which the coupling between the nut 45 and the body 35 is released.

  During the above operation, the members related to the sealing performance are not separated or disassembled at all, and the sealing performance does not change before and after the electric wire 42 is replaced. For this reason, it is not necessary to perform a pressure | voltage resistant leak test after electric wire 42 replacement | exchange.

  In such a configuration of the present embodiment, by maintaining the sealing performance even during the wire replacement work, the pressure leak test after the wire replacement becomes unnecessary.

  In addition, when replacing the entire components shown in FIG. 1, a pressure leak test after replacement is essential, but since the wire portion can be separated from the body portion, by separating them in advance In addition, the connection between the in-plant wiring and the electric wire 42, which has been performed after the conventional pressure leak test, can be performed in parallel with the pressure leak test, and the work time and exposure can be reduced.

  Furthermore, the cable module 34 is attached to the header plate with the O-ring removed, and once the cable module 34 is removed from the header plate, it is necessary to replace the O-ring with a new one when reattaching. According to this embodiment, it is possible to remove a plurality of electric wires from the body portion in a lump, and the replacement of the O-ring can be completed in a very short time, thereby shortening the working time and reducing the exposure.

  Further, as a secondary effect, it is possible to replace only the body portion while the wire portion is connected to the in-plant wiring.

The longitudinal section showing the embodiment of the cable module concerning the present invention. The side view which shows the conventional cable module as a partial cross section.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Reactor containment vessel electric wire penetration part, 11 ... Body, 12 ... Male screw, 13 ... Female screw, 14 ... Fastening member, 15 ... Seal case, 16 ... Male screw, 17 ... Female screw, 18 ... Cap, 19 ... Surface side protrusion , 20, inner potting board, 21, leak monitoring space, 2, leak detection hole, 23, detection tube, 24, valve / pressure gauge assembly, 25, conductor, 26, socket, 27, electric wire, 28, outer potting Board, 29 ... Inner side protrusion, 30 ... Inner seal member, 31 ... Outer seal member, 32 ... Closure plate, 33 ... Insulation sleeve, 34 · Cable module, 35 · Body, 36 · Closure plate, 37 · Potting board, 38 ··· Leak monitoring space 39 · Leak detection hole · 40 · Conductor · 41 · Contact · 42 · Electric wire · 43 · Seal member · 44 · Cap · 45 · · · 4 ‥ gasket, 47 ‥ retaining ring.

Claims (4)

A tubular body penetrating the reactor containment vessel wall as a header plate, a plurality of linear conductors disposed along the axial direction in the body, and the conductors are spaced in the radial direction. A plurality of potting boards that are supported to be opened, a sealing member that surrounds the conductor and is disposed within the body, and a space for leak monitoring is disposed between the sealing members, A pair of caps capable of leading out a plurality of electric wires connected to the conductor by closing both ends of the body, the body, the plurality of potting boards, the plurality of conductors, and the sealing member; The cable module of the reactor containment vessel electrical wiring penetration part characterized by having an integrated structure. The cable module of the reactor containment electrical wiring penetration part according to claim 1, wherein the caps are detachably attached to the body. The cable module of the reactor containment vessel electrical wiring penetration part according to claim 1, wherein a potting board for supporting the electric wire to be led out in the same arrangement as that of the conductor is provided inside each cap. The cable module of the reactor containment electrical wiring penetration part according to claim 1, wherein a gasket is provided at a joint part between the body and the cap.

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