JPS60135898A - Connecting branch box for coaxial cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection branch of a 1111+ cable set in a reactor nuclear instrumentation circuit formed between a reactor containment vessel and a central control unit in a nuclear power plant or the like. Regarding f).

As shown in Fig. 1, in a nuclear power station, a nuclear reactor RF device 32 containing a reactor core (not shown), a steam generator 35, etc. are built into the pressure ♀'i-(+: It is equipped with a nuclear reactor facility 37 which is surrounded by an external shielding wall 3G around the reactor containment vessel 4, and a control building 38 that centrally controls various equipment at the plant'-1i. It detects and measures various phenomena related to nuclear reactions occurring in the reactor vessel 32 of the reactor containment vessel 4, and transmits the detection signals etc. to the central control unit 39 equipped in the control building 38, or conversely, various phenomena are detected and measured. A reactor nuclear instrumentation circuit 40 is configured to extend between the reactor containment vessel 4 and the centralized control unit 39, and transmits the control signal from the centralized control unit 39 to the inside of the reactor containment vessel 4.

Conventionally, in this type of nuclear reactor nuclear instrumentation circuit 40, the -
As an example, in order to transmit electrical signals from various detectors installed inside the reactor containment vessel 4, a coaxial cable is connected to each detector, and the other end of each cable is connected to the reactor containment vessel 4. A wire penetration device 30 attached to the outer wall was connected. However, in this case, the number of wire penetration devices 30 corresponding to the number of coaxial cables is required, and a large number of through holes are formed in the reactor containment vessel 4, which requires strict airtightness, for attaching the calming devices 30. This not only increases the cost of maintaining the airtightness of the containment vessel 4 and other related construction costs, but also complicates cable connection work, which requires significant effort and time. there were.

Therefore, the present invention includes a single coaxial cable connected to a wire penetration device and a plurality of coaxial cable groups connected to various detectors, and branches and connects the plurality of coaxial cable groups and a single coaxial cable. By providing a connection branching box with a built-in branching means, the aforementioned conventional p problems can be solved all at once.
'11.

Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

2 to 4 show an embodiment of a connection branch box for one cable on the same side according to the present invention, the box body 1 includes an outer shield case 2 and an inner shield case 3, and the box body 1 includes an outer shield case 2 and an inner shield case 3. It is located inside the containment vessel 4. The external shield case 2 is a rectangular parallelepiped sealed case made of a metal material such as iron or stainless steel, and has a cylindrical boss-shaped through hole 7 (see FIG. 3) in the left side wall 5 through which four coaxial cables 6 are respectively inserted. In addition, one coaxial cable 9 is installed on the right side wall 8.
A cylindrical boss-shaped through hole 7. The mounting pieces ILII provided on the upper and lower side walls 10.10 are fixed to a base such as the outer wall of the containment vessel 4, thereby fixing them in a predetermined position within the containment vessel 4. has been done. The inner shield case 3 is a rectangular parallelepiped sealed case made of a metal body made of brass, silver, iron, etc., and is housed inside the outer shield case 2. The left side wall 13 (see Figure 4) has through holes 14 at four locations, and the right side wall 1!15 (
A through hole 14 is provided at one location (see FIG. 4).

The coaxial cables 9 and 6 are each triplex 1 tlt+l.
Each of the coaxial cables 6 has a moisture-proof pin jack connector (connection tool) 16a at the left end, and is sequentially inserted into the through hole 7 of the outer shield case 2 and the through hole 14 of the inner shield case 3. The coaxial cables 6 are inserted through the inner seal and the right end thereof is located approximately at the center of the case 3. Heat-shrinkable tubes 17 covering the surface and the outer peripheral surface of the cable 6 are fitted and fixed on the outside, and a shrinkable tube 18 having a compression property is also interposed between each cable 6 and the through hole 14, Each through hole 7 and each through hole 1 are provided by both tubes 17.18.
4 and each cable 6 is hermetically closed. On the other hand, like the coaxial cables 6, the coaxial cable 9 is also inserted into the inner and outer shield cases 3, 2, and the gaps between the through hole 7 and the through hole 14 are hermetically closed by the tubes 17 and 18, and the right end It has a moisture-proof bottle jack connector (another connector) 16b, and its left end is arranged to face the right end of each coaxial cable 6 at approximately the center of the internal shield case 3.

The right end of each coaxial cable 6 and the left end of the coaxial cable 9 are each connected to an internal conductor 19. Outer conductor 21 and shield 2
3 is exposed, the external base 24 and the external insulator 22 are exposed.
and the internal insulator 20 are sequentially peeled off. That is, the triple coaxial cable used as the double coaxial cable 6°9 has an inner insulator 20 covering the outer periphery of an inner conductor 19 made of a wire core, and a tubular outer conductor 21 provided around the outer periphery of the inner insulator 2O. , outer insulator 2
2. Shielding body 23 and outer sheath 2 covering the outermost periphery
The left and right ends of both coaxial cables 6 and 9 are respectively exposed from the internal conductor 19 by a shield 23 for a predetermined length necessary for connection.

The right end of each coaxial cable 6 and the left end of the coaxial cable 9 are branched and connected by a branching means 25 built into the internal shield case 3. This branching means 25 connects a plurality of lead wires to the required positions of both cables 6.9 through a connecting crimp sleeve and a soldering side. That is, the inner conductors 19 of the coaxial cables 6 adjacent to each other
Connect the ends with three lead wire pieces 26aK,
The central lead wire piece 26a and the end of the internal conductor 19 of the coaxial cable 9 are connected by another lead wire piece 261), thereby branching and connecting both cables 6.9.

Each connection portion is then caulked with a crimp sleeve 27. Next, each outer conductor 21 of the coaxial cable 6 and the outer conductor 21 of the coaxial cable 9 are connected to the lead wire piece 26G.
Connect sequentially by Finally, each of the shields 23 of the coaxial cable 6 and the shield 23 of the coaxial cable 9 are sequentially connected by the lead wire piece 26d, and the lead wire piece 26d
Connect one end to the internal shield case 3. The connection portions between the external conductor 21 and the shield 23 are soldered.

Each of the lead wire pieces 26a+ 26b+ 26CI 26d is coated with insulation except for the connecting portion.

In this way, both cables 6.
After connecting 9 separately, connect internal shield case 3.
An optical negative control 28 having electrical insulation properties is filled inside, and then the inner shield case 3 is sealed. - Furthermore, the outer shield case 2 that houses the inner shield case 3 is also filled with an electrically insulating filler 28, thereby connecting both cables 6.9 and the branching means 25 in the inner shield case 3. In addition to being completely insulated, it is also completely insulated between the inner and outer shield cases 3 and 2 to prevent external noise from entering the system into the external conductor 21 or the shield 23. As the filler used for this, a rubber-based filler such as a two-component curing type silicone compound having moisture-proof and radiation-resistant properties is suitable.

One coaxial cable 9 led out from the right side wall 8 of the external nodal case 2 of the connection branch box with the above configuration is connected to a connector 31 of a wire penetration device 30 airtightly attached to the steel plate outer wall 29 of the reactor containment vessel 4. and is connected via the connector 16b. In addition, four coaxial cables 6 taken out from the left side wall 5 of the external shield case 2 are each connected to a connector 16a.
It is connected to lead cables 34 of various detectors 33 set inside the reactor containment vessel 4 (see FIG. 1).

In such a case, a plurality of output signals from the various detectors 33 are time-divided by signal matching means (not shown) and multiplexed transmission is performed. In addition, although the case where the signal is transmitted from inside the nuclear reactor containment vessel 4 has been explained above, it is also possible to transmit the signal into the same vessel 4.

FIG. 5 shows a modification of the connecting device 16a and other connecting devices 161), in which both the connecting devices 16a and 16b are composed of moisture-proof receptacles fixed to the left and right side walls 5, 8 of the external shield case 2. This is what I did. In addition, each connection tool 16a.

161) may be of any type as long as it is resistant to the high-pressure environment inside the reactor containment vessel 4, and various design changes are possible.

In the above embodiment, one coaxial cable 9 is branched and connected to four coaxial cables 6 via the branching means 25, but the number of branches can be changed as required. Not even.

As explained above, according to the present invention, the box body is composed of an external shield case and an internal shield case housed in the case via electrical insulation means.1. In this way, a single coaxial cable can be branched and connected to the required number of coaxial cables. Therefore, since a large number of coaxial cables connected to various detectors or controllers installed in the reactor containment vessel can be connected separately, the wire penetration device connected to the coaxial cables can also be connected to the number of branch boxes according to the present invention. It is only necessary to install a proportional number of penetrating devices, and the number of penetrating devices to be installed can be significantly reduced compared to the conventional method, and the associated costs for maintaining the airtightness of the reactor containment vessel can be reduced as much as possible. It has the advantage of not only being able to do a lot of work, but also simplifying the cable wiring work.

In addition, since the box body is formed into a double box shape and electrical insulation is provided between the inner and outer cases, it is possible to prevent external noise from entering the system into each coaxial cable even in a high-pressure reactor containment vessel. be effective.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing the main parts of a well-known nuclear power plant. Fig. 2 is a front view showing an embodiment of the present invention, Fig. 3 is an enlarged sectional view of section 111 in Fig. 2, Fig. 4 is a longitudinal sectional front view showing the internal shield case, and Fig. 5 is a modification. It is a front view. 1. Box body, 2. External shield case, 3. Internal shield case, 4. Reactor containment vessel, 6. Coaxial cable, 9. Coaxial cable, 16a. Connector, 1, '61
)...Other connectors, 25. Branching means, 28. Electrical insulation means (filling material), 4o. Reactor nuclear instrumentation circuit. Applicant: Sanben Denki Co., Ltd., Inuichi Nippon Electric Cable, Inc. Agent: Patent Attorney Kazuhide Okada Case Relationship with Patent Attorney Kazuhide Okada Patent Applicant Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name:
(601-) Mitsubishi type (Iku Co., Ltd. Representative: Hitoshi Katayama (1 person) 4, Agent address: 8, Chiyoda Building North Building, 13-38 Naniwa-cho, Kita-ku, Osaka City, Contents of amendment (1) The scope of claims is amended as shown in the attached sheet. (2) In the 13th line of page 2 of the specification, the words "reactor nucleus" are amended to "nuclear reactor". The words "40" are replaced with " Make corrections to the transmission device 40J of the reactor instrumentation circuit. [Time division] should be corrected to [Time division or same wave number division]. (6) In the fourth line of page 12 of the Mei MJJ book, the phrase "Reactor nuclear instrumentation circuit" should be changed to [Reactor nuclear instrumentation circuit]. amended to ``transmission device for instrumentation circuit.'' 22. Claims (1) A connection branch box for coaxial cables set in a nuclear reactor instrumentation circuit, the box body being connected to a nuclear reactor. It has an external shield case disposed within the containment vessel and an internal shield case housed within the case via electrical insulation means, and a plurality of coaxial cable groups each having a connector at the tip are connected to one of the box bodies. At the same time, a single coaxial cable with another connector at the tip is introduced into the internal shield case from the other side of the box main body, and the inner end of each case of the coaxial cable group and A coaxial cable connection branch box characterized in that a branching means for branching and connecting the inner ends of the coaxial cable case is housed in an internal shield case. (2) Electrical insulation means are installed inside both the inner and outer seals 1+' case. A connection branch box for a coaxial cable according to claim 1, which is made of a filler material having electrical insulation properties that is made of light. A coaxial cable connection branch box according to claim 1, which is a moisture-proof connector located at a distance. A coaxial cable connection branch box according to claim 1, which is a soundproof wall receptacle.

Claims (1)

[Claims] +++ A coaxial cable connection branch box set in a nuclear reactor nuclear instrumentation circuit, which box main body is connected to an outer Wlt shield case disposed within the reactor containment vessel and an outer Wlt shield case disposed within the reactor containment vessel. A plurality of coaxial cable groups each having a connector at the tip thereof are introduced into the inner shielding case from one side of the box body, and a group of coaxial cables having an inner shield case housed through an electrically insulating means are introduced into the inner shield case from one side of the box body. Branching means for introducing a single coaxial cable having a connector into the internal shield case from the other side of the box body, and branching and connecting the inner ends of each case of the coaxial cable group and the inner ends of the coaxial cables to each other. A coaxial cable connection branch box characterized by being housed inside an internal shield case. (2) A coaxial cable connection branch box according to claim 1, wherein the electrical insulation means is an internal shield case filled with a filler having electrical insulation properties. (3) The coaxial cable connection branch box according to claim 1, wherein the connector and the other connectors are moisture-proof connectors located apart from the external/hard case. (4) A coaxial cable connection branch box according to claim 1, wherein the connector and the other connector are moisture-proof receptacles each attached to an outer surface of an external shield case.