JPS60128389A - Inserting section structure of pressure vessel for nuclear reactor - 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] [Field of Application of the Invention] This invention relates to the structure of the insertion part of the piping of a nuclear reactor pressure vessel, and particularly relates to a structure that allows for mutually independent assembly and disassembly of the vessel connection parts of the internal and external piping. This is such an invention.

[Background of the invention]

In conventional nuclear reactors with built-in heat exchangers, the reactor primary system and
In order to prevent cooling leakage between the secondary systems formed from the heat exchanger, etc., and to allow the heat exchanger's outlet piping to penetrate the pressure vessel top cover, the pressure vessel top cover and heat exchanger must be removed individually. It needed to be installed.

In this case, the connection between the external piping and the internal piping was made by welding the internal piping, such as a heat transfer tube, at the nozzle of the pressure vessel, or by welding the other side, so maintenance of the upper cover of the pressure vessel, etc. There is a drawback that it is not possible to connect or penetrate equipment that requires piping to be removed and reassembled for inspection and maintenance.

Another drawback was that the work was extremely careful and accuracy control was difficult.

As a result, there was a disadvantage that running costs were high.

[Purpose of the invention]

The purpose of this invention is to solve the problems of the reactor vessel based on the above-mentioned prior art as a technical problem, to prevent fluid leakage from inside the reactor piping such as heat transfer tubes, and to prevent leakage of fluid from the pressure vessel upper cover during maintenance and inspection. , remove the heat exchanger tubes independently from each other,
It can be installed easily, making maintenance of heat transfer tubes easier, and
The object of the present invention is to provide an excellent nuclear reactor vessel insertion part structure that facilitates workability, improves management accuracy, and benefits the use of ancillary equipment in the nuclear reactor industry.

[Summary of the invention]

The structure of the present invention is that in a nuclear reactor in which heat transfer tubes are provided in a pressure vessel and connected to external piping through a penetration part of the pressure vessel, fluid leaks from a piping loop formed from heat transfer tubes, etc. The flanges that oppose the inner and outer piping to the pressure vessel top cover, etc., allow for independent removal and attachment, improving maintenance and workability, and guaranteeing assembly accuracy. It uses a technical measure of double flange structure that can be connected inside and outside.

[Example - Configuration]

Next, one embodiment of the present invention will be described below based on the drawings.

It is installed by penetrating the inside of the reactor pressure vessel 1 from the outside, and the transfer fluid inlet section 2 and outlet section 3 are connected to the upper cover 4 of the reactor pressure vessel 1 and the body of the reactor pressure vessel 1. □ The internal heat transfer tube 6 installed through the flange to the body 5 is supported by a support 7 extending inwardly and fixed to the body 5, and is connected to the external pipe 8 as described below.Thus, the reactor The pressure vessel 1 and the insertion portions 2 and 3 of the reactor pressure vessel upper lid 4 have a double flange structure with flanges on the inside and outside, with the flange of the heat transfer tube 6 on the inside and the flange on the outside. The structure is such that a flange for the outside-furnace pipe 7 is provided and tightened.

Regarding the structure, tightening of the flanges of these insertion parts is the first step.
The structure of the body part 5 in part B in Figure B is shown in detail in Figures 2 to 4. First, as shown in Figure 2, bolts 10 are attached to the lower end flange part 9 of the heat transfer tube 6 to the reactor pressure vessel 1. As shown in FIG. 3, insert the bolt 10 into the body 5 and tighten it with the nut 11. Next, as shown in FIG. It is tightened and fixed to the body part 5 through.

On the other hand, the mounting structure of the insertion part of the heat transfer tube 6 in the section A of the upper cover 4 of the reactor pressure vessel 1 is as shown in FIGS. 5 to 8.
In FIG. 5, bolts 1-O? are attached to the upper end flange 14 of the heat exchanger tube 6 in advance. The bolts 10 are inserted into the screw holes of the seven rams 16 of the cylinder 15 which stands up from the upper cover 4, and are tightened with the nuts 10 to fix them as shown in FIG.

Then, as shown in FIG. 8, the flange 17 of the outer furnace piping 8 is tightened and fixed to the flange 16 surface of the upper lid 4 via the bolts 13, and the assembly is completed. The heat tube 6 is supported in a predetermined manner by a support 7 extending integrally from the inner surface of the body 5 of the reactor pressure vessel 1.

In the above configuration, although the external pipe 8 and the internal heat transfer tube 6 are separate from the reactor pressure vessel 1, they can be easily assembled and disassembled via the flange of the vessel, and sealing can be performed reliably. .

And the cooling machine is running without any leaks.

Moreover, heat exchange can be performed reliably.

Note that the embodiments of this invention are limited to the above-mentioned embodiments.

As shown in FIG. 9, the flange portion of the reactor pressure vessel upper cover 4 and the heat transfer tube 6. In addition, if the flange portions of the outside piping 8 are aligned together with the bolts 13, the flange 1
4.17' structure can be made into a simple structure.

Further, the present invention is not limited to the connection of the heat transfer tubes 6, but if the connection between the inside and outside of the furnace piping has a double flange structure with flange portions inside and outside, installation and removal can be facilitated. Various aspects can be adopted, such as being able to be applied to a mirror surface of a container.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent leakage between the loop formed from heat transfer tubes, etc. and the inside of the reactor pressure vessel, and also to completely prevent leakage outside the boundary, thereby improving safety. An excellent effect is produced.

In addition, the upper cover of the pressure vessel and the piping inside the heat exchanger tube furnace can be removed and installed independently of each other, thus making maintenance, inspection, and handling easier. is played.

[Brief explanation of drawings]

The drawings are explanatory diagrams of embodiments of this invention. Fig. 1 is a sectional view of the heat exchanger tube installed through the penetration part of the first embodiment, and the second
~ Figure 4 is a sectional view explaining the installation process of part B in Figure 1, and Figure 5.
8 are sectional views illustrating the attachment process of part A in FIG. 1, and FIG. 9 is a sectional view of another embodiment equivalent to FIG. 8. 1... Pressure vessel, A, B... Insertion part, 6.8...
Piping. 9.12, 14, 17.17'...flange. Agent Patent Attorney Akio Takahashi Figure 1 Box 20 0 Figure 3 Mo 4 [ffi Mo 5 no 0 Mo 3 m Kabuto 9 m

Claims (1)

[Scope of Claims] 1. In a reactor vessel insertion part structure in which a part of a piping loop that transfers a fluid different from that in the pressure vessel passes through the pressure vessel, the inside and outside surfaces of the pressure vessel insertion part of the piping loop are A pressure vessel insertion part structure characterized by a double flange that is removably joined via flanges to which piping can be connected. 2. A patented structure characterized in that at least one of the double flanges is a flange that fully contacts the surface of the container. 3. The reactor pressure vessel insertion portion structure according to claim 1, wherein the pressure vessel insertion portion has a flange portion at the tip of the cylindrical body.