JPH06308290A - Wire harness for radiation environment - Google Patents

Abstract

PURPOSE:To secure a semi-permanent life and facilitate electric connection for a cable and a connector portion permanently installed in a cell chamber in a wire harness for the radiation environment. CONSTITUTION:A wire harness is provided with a connector plug 12 connected to the connector receptacle 11 of a wall penetration section 3, a metal sheath inorganic insulated cable 13 connected to the connector plug 12 and circulated in a cell chamber, and a connector receptacle 15 connected to the tip of the metal sheath inorganic insulated cable 13. A contact is buried and fixed in a metal casing 3b by an inorganic insulating material 3c, the metal casing 3b and the metal sheath portion of the cable 13 are welded into a sealed structure, the inorganic insulator is isolated from the surrounding environment, and the occurrence of a moisture absorbing phenomenon is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation environment wire harness.

[0002]

2. Description of the Related Art In a cell chamber under high radiation dose and high temperature environment,
When installing electrical equipment, it is desirable to fully consider the radiation resistance and heat resistance of electrical equipment and electric cables. As an electrical insulating material applied to these applications, synthetic resin such as polyimide is used. And mica,
Inorganic materials such as glass fiber are considered compatible.

In this case, if the insulated cable is made of an inorganic insulating material, its hygroscopicity may cause nitric acid mist or moisture in the cell chamber to be adsorbed and impair its insulating property. The adoption of a PH cable (hypalon sheath, ethylene propylene rubber insulated cable) that has high resistance and excellent moisture resistance is being considered. The radiation resistance of the PH cable is 200 Mrad (2 × 10 ⁸ r
ad).

[0004]

However, the radiation dose in the vicinity of the glass melting furnace in the vitrification treatment facility for high-level waste liquid is set to be about 10 ⁶ , and the average dose rate inside the cell chamber is 10 ⁴ rem. / It is set when it reaches about an hour. Therefore, in the case of the PH cable, it is estimated that the service life thereof will be about 100 to 200 hours near the glass melting furnace and about 10,000 hours (about 1 year) inside the cell chamber. In the vicinity of, the temperature becomes a high temperature atmosphere of about 100 ° C., so that the deterioration of the cable is promoted, and the cable replacement work must be performed frequently.

The present invention effectively solves such a problem. In other words, the purpose is to ensure a semi-permanent life of the cable and the connector portion that is permanently laid inside the cell chamber and facilitate electrical connection.

[0006]

In the case of a wire harness which is arranged on a shielding wall that surrounds a cell chamber under a radiation environment and is connected to a wall penetrating portion in which an electric conductor is embedded, the wire harness is connected to a connector receptacle of the wall penetrating portion. A connector plug, a metal sheath inorganic insulated cable connected to the connector plug and routed inside the cell chamber, and a connector receptacle connected to the tip of the metal sheath inorganic insulated cable, wherein the connector receptacle and the connector plug are The contactor is fixed in an embedded state in the metal casing by an inorganic insulating material, and the welding portion is arranged at the joint between the metal casing and the metal sheath of the cable.

[0007]

The portion exposed to the radiation environment is shielded from the surrounding environment by covering the connector with the metal casing and the cable with the metal sheath. Then, the contactor is embedded in the inorganic insulating material at the connector portion, the conductor portion is covered by the inorganic insulating material at the cable portion, and the metal casing and the metal sheath are sealed by the welded portion. As a result, it is possible to prevent deterioration of the insulating material and extend the life of the insulating material. Further, other cable connections and the like to the cables are made based on the detachability between the connector receptacle and the connector plug.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a radiation environment wire harness according to the present invention will be described below with reference to FIGS. In each drawing, reference numeral 1 is a cell chamber, 2 is a shielding wall, 3 is a wall penetrating portion, 10 is a wire harness, 11 is a connector receptacle, 12 is a connector plug, 13 is a metal sheath inorganic insulated cable, 14 is a connector box, 15 Is a connector receptacle, 16 is a connector plug, 17 is a power supply cable, 18 is an electric device, 19 is a support structure, W is a welded portion, and M is a welded portion.

The cell chamber 1 has a hermetically sealed structure surrounded by a liner 2a attached to the inner surface of the shielding wall 2, and is intended to accommodate a radioactive substance or a radiation source having a high radiation dose therein.

The wall penetrating portion 3 is for laying an electric conductor 3a in a state of penetrating the shielding wall 2. As shown in FIG. 1, an inorganic insulating material (for example, heavy concrete) 3c is provided in a metal casing 3b. And the electric conductor 3a is buried in a sealed state, and the flange 3d of the metal casing 3b is attached to the liner 2a by the welded portion W.

The wire harness 10 is
It is installed in a permanently extended state to facilitate the electrical connection between the wall penetrating portion 3 and the electric device 18, and includes a connector receptacle 11, a connector plug 12, and
Metal sheath inorganic insulated cable 13, connector box 1
4, connector receptacle 15 and connector plug 16
Etc. shall be assembled or connected.

As shown in FIGS. 2 and 3, the connector receptacles 11 and 15 and the connector plugs 12 and 16 have a metallic casing 21 in which male and female contacts 22A and 22B are made of an inorganic insulating material such as glass. The contacts 22A and 22B are fixed in a buried state by the material 23, and are arranged with a space between each other, and are connected to the electric conductor 3a and the conductor 13a of the metal sheath inorganic insulated cable 13 so that each contact Even in the connection portion between the children 22A, 22B and the conductor 13a, the inorganic insulating material 23 is integrated in a buried state. In the example of FIG. 1, a space between the connector receptacle 11 and the connector plug 12 is attached by an appropriate fastener B such as a bolt.

The metal sheath inorganic insulated cable 13 is
As shown in FIG. 1, FIG. 2 and FIG. 3, it is laid inside the cell chamber 1 in a drawn state, and for example, a glass tape is covered after insulating around the conductors 13a of three cores with a polyimide tape, An inorganic insulating coating 13b covered with a glass braid, a glass tape or the like is provided, and a metal sheath 13c made of a corrugated stainless steel pipe is arranged on the inorganic insulating coating 13b. The metal casing 21 of each connector and the metal sheath 1 are provided.
The inside of 3c is sealed by the welded portion M.

To further explain, in the conductor 13a and the contacts 22A and 22B of the wire harness 10, the periphery thereof is covered with the metal sheath 13c and the metal casing 21, and the inorganic insulating material 2 such as glass is used.
Since the structure is sealed by 3, the inorganic insulating coating 13b in the metal sheath inorganic insulating cable 13 is
Isolated from the surrounding environment, the original insulation is retained semi-permanently. The portion of the metal sheath inorganic insulated cable 13 maintains a bendable state based on the flexibility of the inorganic insulating coating 13b and the metal sheath 13c.

Further, as shown in FIG. 1, the connector box 14 is mounted on a support structure 19, a plurality of connector receptacles 15 are arranged in parallel connection, and the connector plugs 16 are connected to each other. Electric power is supplied to the electric device 18 via the power supply cable 17. The connection and disconnection of the connector plug 16 with respect to the connector receptacle 15 can be freely performed based on the detachability of the connector, and when a defect such as deterioration of the power supply cable 17 or the electric device 18 due to radiation irradiation occurs, The connector plug 16 is separated and replaced.

[0016]

The wire harness for radiation environment according to the present invention has the following effects. (1) By forming a wire harness for a portion routed inside the cell chamber, covering the conductor portion of the connector and the cable with an inorganic insulator, and airtightly covering the inorganic insulator with a metal casing and a metal sheath, the inorganic insulator In addition to being able to suppress the deterioration in the radiation environment by taking advantage of its advantages, the initial electrical insulation state can be maintained for a long time by isolating the inorganic insulator from the surrounding environment and preventing the occurrence of moisture absorption phenomenon. It can be maintained and the life can be extended. (2) By using a wire harness, electrical connectivity inside the cell chamber can be improved.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a radiation environment wire harness according to the present invention.

FIG. 2 is a front view showing an enlarged cross-section of a part of a connector portion in FIG.

FIG. 3 is a side view of a connector portion in FIG.

4 is a cross-sectional view of the metal sheath inorganic insulated cable portion in FIG.

[Explanation of symbols]

 1 Cell Chamber 2 Shielding Wall 2a Liner 3 Wall Penetration 3a Electric Conductor 3b Metal Casing 3c Inorganic Insulation Material 3d Flange 10 Wire Harness 11 Connector Receptacle 12 Connector Plug 13 Metal Sheath Inorganic Insulation Cable 13a Conductor 13b Inorganic Insulation 13c Metal Sheath 14 Connector Box 15 Connector receptacle 16 Connector plug 17 Power supply cable 18 Electric equipment 19 Support structure 21 Metal casing 22A, 22B Contactor 23 Inorganic insulating material W Welding area M Welding area B Fastener

Claims (1)

[Claims] 1. A wire harness that is connected to a wall penetrating portion that is arranged on a shielding wall that surrounds a cell chamber under a radiation environment and that has an electric conductor embedded therein, the connector plug being connected to a connector receptacle of the wall penetrating portion. The connector includes a metal sheath inorganic insulated cable connected to the connector plug and routed inside the cell chamber, and a connector receptacle connected to the tip of the metal sheath inorganic insulated cable. A wire harness for a radiation environment, characterized in that it is fixed in an embedded state by an inorganic insulating material, and a welded portion is arranged at a joint portion between a metal casing and a metal sheath of a cable.