JPS644285Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric wire penetration device for a nuclear reactor that enables easy replacement work.

Conventionally, for example, a wire penetration device for a nuclear reactor containment vessel has been constructed by directly connecting a cable connection end portion to a module housing containing a wire assembly by welding means. The header is inserted into a hole in a header provided at the end of the sleeve passing through, and the header and module housing are welded to each other.

The wire penetration device of the reactor containment vessel does not normally need to be replaced, but it may be replaced if its performance deteriorates during use or if a new product is developed. Such replacement work requires cutting the end of the module housing because the module housing and the cable connection terminal are directly welded, so the length of the module housing is the same as the cut length. Moreover, when replacing the module housing, a new welding groove must be created on the module housing.

Further, in order to increase the density of cables stored in the electric wire penetration portion provided in the reactor containment vessel, the distance between the wire penetration portion and the adjacent module housing is narrowed, making it difficult to use a beveling machine or the like.

This idea was made in view of the above points,
The module housing can be cut by providing a threaded part at the end of the module housing, and connecting the joint ring screwed onto the module housing with the cable connection terminal, and the module housing and the joint ring with each other by welding. It is an object of the present invention to provide a wire penetration device for a nuclear reactor, which can be replaced without having to be replaced and can be easily operated on-site to reduce radiation exposure.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes the main body of a wire penetration device for the reactor containment vessel, and the wire penetration device main body 1 includes a header 4 fixed to the end of a sleeve 3 that penetrates the reactor containment vessel 2. They are inserted into the holes and are coupled together by welding means 5.

As shown in FIG. 2, the electric wire penetration device main body 1 includes a cylindrical module housing 6 inserted into a sleeve 3, an electric wire assembly 7 housed in the module housing 6, and an electric wire assembly 7. A cable connection terminal part 8 is inserted into the module housing 7 so as to be connected to the cable connection terminal part 8, and a threaded part 9 is formed on the outer peripheral surface of the cable connection terminal part insertion side end of the module housing 6. . Its threaded part 9
A splicing ring 10 is threaded through the cable connection terminal 8. The joint between the joint ring 10 and the cable connection terminal 8 is connected to each other by a welding means 11, and the joint between the joint ring 10 and the module housing 6 is connected to each other by a seal weld 13 via an O-ring 12.

Therefore, when replacing the wire penetration device, the joint ring 10 is first cut at a portion close to the welded portion 11. As a result of this cutting, the cable connection terminal portion 8 and the wire assembly 7 are brought into a disconnected state from the module housing, and can be taken out from the module housing 6 as a whole.

Next, the joint ring 10 is cut at a portion close to the welded portion 13, and the joint ring 10 is removed from the module housing 6 by turning in a direction to loosen the screw connection.

After the remaining part of the joint ring is removed from the module housing, a new wire assembly 7 and cable connection terminal 8 are inserted into the module housing 6, the joint ring 10 is screwed onto the module housing 6, and welding is applied. The replacement work is completed by welding the joint ring 10 and the cable connection terminal portion 8, and by welding the joint ring 10 and the module housing 6.

As described above, according to the present invention, a threaded portion is provided on the outer circumferential surface of the end of the module housing, and the cable connection terminal portion inserted into the module housing is connected to the module housing via a connecting ring. Therefore, seismic loads and thermal stress can be supported by this threaded part, and deformation due to welding heat can be reduced.Moreover, by welding the joint ring and cable connection terminal, and the module housing and joint ring, respectively, the module housing can be It is possible to replace the electric wire assembly without cutting it, and it is also possible to replace the module housing alone.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a state in which a wire penetration device for a nuclear reactor containment vessel according to the present invention is used, and FIG. 2 is an enlarged sectional view of a main part of the wire penetration device. 3... Sleeve, 4... Header, 6... Module housing, 7... Electric wire assembly, 8... Cable connection terminal, 9... Threaded part, 10... Next ring, 11... Welded part, 13...Welding part.

Claims (1)

[Scope of utility model registration request] A threaded portion is provided on the outer peripheral surface of the end of the module housing that houses the electric wire assembly, and the cable connection end portion inserted into the module housing is connected to the module housing via a joint ring, and the joint ring and cable are connected to each other through a joint ring. A wire penetration device for a nuclear reactor, characterized in that a connecting end, a module housing, and a connecting ring are each welded.