JP2004157050A - Cable penetration - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide cable penetration capable of reducing to the utmost interference of peripheral equipment or the like, and minimizing an exchange term of works, waste or cost. <P>SOLUTION: In this cable penetration for holding a cable module 6 penetrating a nuclear reactor containment 1, a cable holding part is divided into a plurality of units 25a, 25b, assembled in a factory or on a site, and loaded on the site relative to each unit into a sleeve 3 penetrating the nuclear reactor containment 1, to thereby complete assembly. The cable penetration for replacement can be installed without interfering with the peripheral equipment by this constitution, and not only a work process can be shortened greatly without requiring removal and restoration of the peripheral equipment but also generation of radioactive waste resulting from the removal can be avoided, and also the terrestrial environment, a construction process and the operation rate of a power plant can be improved. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cable penetration for penetrating and holding a cable module in a reactor containment vessel.
[0002]
[Prior art]
As shown in FIG. 7, the cables penetrating the containment vessel are held by a cable penetration forming a pressure boundary.
[0003]
That is, a sleeve 3 as a nozzle is pierced through the reactor containment vessel 1 and the shield wall 2, and a header ring 5 is provided at an end protruding outward from the shield wall 2 of the sleeve 3 via the adapter 4. The header ring 5 has a plurality of cable modules 6 mounted thereon. Each cable 7 of the cable module 6 mounted on the header ring 5 is connected to an external cable 10 via a terminal 9 held in a terminal box 8. On the other hand, a cable holding portion including a plurality of supports 12 connected by support rods 11 is provided in the sleeve 3, and the cable portion 13 of the cable module 6 is inserted into each support 12 of the cable holding portion. The end of each cable portion 13 is held and connected to an internal cable 16 via a terminal portion 15 in a terminal box 14 in the storage container 1. A mounting flange 17 is attached to the inside of the storage container of the sleeve 3, and the terminal box 14 is held on the mounting flange 17. A cover 18 is mounted on the outer periphery of each support 12 so as to cover the cable portion 13 held by the support 12. A shell 20 for centering by the fixing bolt 19 and positioning in the circumferential direction is provided. Note that reference numeral 21 in the figure is a peripheral device.
[0004]
Since the cable penetration uses an organic material such as epoxy for the cable and the pressure boundary penetration portion of the cable, the cable penetration has a life and needs to be replaced.
[0005]
The cable penetration is not only the module type shown in FIG. 7, but also a canister type having an epoxy-filled cable penetration part integrated with a header ring part.
[0006]
When replacing these types, the entire cable penetration is removed by cutting from the welded portion between the adapter 4 and the sleeve 3 shown in FIG. Then, the cable penetration to be newly loaded is manufactured and completed at the factory in the shape shown in FIG. 7, and the adapter 4 with the built-in header ring and the sleeve 3 are completed on site by welding.
[0007]
[Problems to be solved by the invention]
By the way, in the conventional cable penetration, the header ring 5 to the cover 18 and the shell 20 are assembled at a factory so as to be integrated, subjected to an electric test such as a pressure test, transported to the site, and then transferred to the local storage container sleeve 3 at the site. The end face of the built-in sleeve 3 and the adapter 4 were welded to each other to attach to the containment vessel.
[0008]
In this case, at the time of plant construction, since other devices are installed before they are installed on the carrying route or the installation place, they can be installed smoothly without interference and are rational. However, when replacing the cable penetration at the existing plant, the cable penetration may interfere with peripheral equipment during loading and loading because other equipment is installed at the loading route and installation location. However, there is a problem that it is necessary to remove the interfering devices, and it takes a lot of time and work.
[0009]
In addition, if there is a pipe related to a safety system such as a decay heat removal system in peripheral equipment pipes, it takes a very long time to remove the pipe, and in some cases, it may not be possible to replace the pipe.
[0010]
In view of the foregoing, an object of the present invention is to provide a cable penetration that minimizes interference by peripheral devices and the like, and minimizes replacement work period, waste, and cost as much as possible.
[0011]
[Means for Solving the Problems]
To achieve the above objectives, cable penetrations are temporarily assembled at the factory, and after confirming the soundness of the completed state, disassembled to each unit, transported and transported to the site and the containment installation site, and finally completed at the site. Is assembled.
[0012]
That is, the invention according to claim 1 is a cable penetration holding a cable module penetrating a reactor containment vessel, wherein a cable holding portion is divided into a plurality of units, assembled at a factory or a site, and inserted into the reactor containment vessel. It is characterized in that each unit is loaded on site in the completed sleeve and assembly is completed.
[0013]
According to a second aspect of the present invention, in the first aspect of the present invention, the axial dimension of each unit is designed within a gap between a header ring or a mounting flange provided at both ends of the sleeve and a peripheral device. It is characterized by having.
[0014]
The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, each unit is loaded and fixed in the sleeve from the installation flange side inside the storage container.
[0015]
According to a fourth aspect of the present invention, in the first or second aspect, each unit is loaded and fixed in the sleeve from both sides of the storage container.
[0016]
The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the unit inside the storage container is fixed to an outer flange surface of a mounting flange provided at an inner end of the sleeve. I do.
[0017]
The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein each unit is provided with a guide pipe for facilitating insertion of the cable module.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0019]
FIG. 1 is a view showing the entire configuration of a cable penetration according to an embodiment of the present invention, and FIGS. 2A and 2B are explanatory views of FIG. 1 at the time of assembly.
[0020]
The cable penetration has substantially the same structure as that shown in FIG. 7, and includes a sleeve 3 as a nozzle attached to the reactor containment vessel 1, and a header attached via an adapter 4 to the outside of the containment vessel of the sleeve 3. The ring 5, the cable module 6 attached to the header ring 5, the supports 22a, 22b ... for supporting the cable portion 13 of the cable module 6, the support rods 23a, 23b ... for holding the supports 22a, 22b ..., A shell 20 for centering them and positioning them in the circumferential direction, a terminal box 8 for holding and supporting a terminal portion 9 for connecting a cable to the external cable 10, and a mounting flange 17 for holding a terminal box 14 in a containment container. It is configured.
[0021]
By the way, a cable holding portion constituted by a support and a support rod is composed of, for example, a first unit 25a in which two supports 22a are connected by a support rod 23a and a cover 24a (FIG. 2) is attached to the outer periphery. A second unit 24b composed of a support 22b and a support rod 23b for connecting it to the support 22a, and a third unit 24c composed of one support 22c and a support rod 23c for connecting it to the support 22b And the shell 20 are assembled in a factory or the like, and transported and carried to the site and the site where the containment is to be mounted, and the final assembly is performed at the site.
[0022]
Next, a method for installation will be described with reference to FIGS. First, the two supports 22a and the support rods 23a constituting the end face are assembled beforehand outside the penetration, and the cover 24a is attached outside to constitute the first unit 25a. Then, the first unit 25a is inserted into the sleeve 3 from the installation flange 17 side. Then, with the end of the first unit 25a protruding from the end of the sleeve 3, the support rod 23b of the second unit 25b is attached to the support 22a, and the divided cover 24b To complete this unit (FIG. 2 (a)).
[0023]
Next, as shown in FIG. 2B, the second unit 25b is inserted into the sleeve 3 in a state where the end part is partially protruded from the sleeve 3, and the support 22b supports the third unit 25c. The rod 23c is mounted, the divided cover 24c is mounted on the outer surface thereof, and these are further inserted into the sleeve 3. At this time, since the length of each unit 25a, 25b,... Is set to be equal to or less than the distance between the peripheral device 21 and the like and the installation flange 17, these units can be easily formed without interference by the peripheral device 21 and the like. Can be assembled in the sleeve 3.
[0024]
In this way, these units are sequentially assembled, and finally, the shell 20 is centered by the fixing bolts 19 to fix the support.
[0025]
This configuration is shown in FIG.
[0026]
Thereafter, the cable module 6 is inserted from the header ring 5 side and assembled.
[0027]
Next, as shown in FIG. 1, the terminal box 8 is attached, and the terminal 9 of the cable is connected to the external cable 10 to complete the operation.
[0028]
FIG. 4 is a view showing another embodiment, in which a support unit is loaded from both the installation flange 17 side and the header ring 5. That is, the supports 22a, 22b, and 22c are sequentially loaded from the installation flange 17 side similarly to the first embodiment, and the support 22d directly connected to the header ring 5 from the header ring 5 by the support rod 23d is mounted from the header ring 5 side. Load in the sleeve 3. The header ring 5 may be welded to the sleeve 3 after the support 22d to which the support rod 23d is connected is loaded into the sleeve 3 from the header ring 5 side.
[0029]
FIG. 5 is a view showing still another embodiment, in which a unit including two supports 22a connected by a support rod 23a is loaded from the header ring 5 side, and two units connected by a support rod 23c. Is mounted from the installation flange 17 side, and the shell 20 attached to the unit is fixed to the outer flange surface of the installation flange 17 with bolts or the like.
[0030]
FIG. 6 shows a structure in which guide pipes 30a and 30b are attached between the supports 22a and 22c and between the supports 22d so that the cable module can be easily loaded when the cable module is inserted.
[0031]
In this case, the function of the support rod can be given to the guide pipes 30a and 30b, so that the support rod can be omitted. This guide pipe can be mounted in the embodiment of FIG.
[0032]
【The invention's effect】
Since the present invention is configured as described above, the replacement cable penetration can be installed without interfering with the peripheral device, and there is no need to remove and restore the peripheral device, thereby greatly shortening the work process. In addition, the generation of radioactive waste associated with the removal can be eliminated, and a very high effect can be achieved in improving the global environment, the construction process, and the operation rate of the power plant.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an entire cable penetration device of the present invention.
FIGS. 2A and 2B are explanatory diagrams when the support unit of FIG. 1 is installed.
3A is a view showing the state at the time of completion of installation of the support unit, FIG. 3B is a sectional view taken along line AA of FIG. 3A, and FIG. 3C is a sectional view taken along line BB of FIG.
FIG. 4 is an explanatory view of a type in which a support is loaded from both sides of a storage container as a modification of the present invention when a cable penetration is installed.
FIG. 5 is a view showing a modification of the support fixing method of the type shown in FIG. 4;
FIG. 6 is an explanatory view of a guide pipe-attached cable penetration when a cable module is loaded.
FIG. 7
FIG. 1 is a configuration diagram of an entire conventional cable penetration device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reactor containment vessel 2 Shield wall 3 Sleeve 4 Adapter 5 Header ring 6 Cable module 7 Support rod 20 Shell 21 Peripheral equipment 18, 24a, 24b, 24c Cover 22a, 22b, 22c, 22d Support 23a, 23b, 23c, 23d Support Rod 30a, 30b Guide pipe

Claims (6)

In a cable penetration that holds a cable module that penetrates the PCV, the cable holding section is divided into multiple units and assembled at a factory or on site, and each unit is installed locally in a sleeve inserted into the PCV. Cable penetration characterized by loading and assembling to complete. 2. The cable penetration according to claim 1, wherein an axial dimension of each unit is designed within a gap between a peripheral ring and a header ring or a mounting flange provided at both ends of the sleeve. The cable penetration according to claim 1 or 2, wherein each unit is loaded and fixed in the sleeve from the installation flange side inside the containment vessel. The cable penetration according to claim 1 or 2, wherein each unit is loaded and fixed in the sleeve from both sides of the storage container. The cable penetration according to any one of claims 1 to 4, wherein the unit inside the containment vessel is fixed to an outer flange surface of a mounting flange provided at an inner end of the sleeve. The cable penetration according to any one of claims 1 to 5, wherein each unit is provided with a guide pipe for facilitating insertion of the cable module.

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