JPS62127698A - Integral annular ring-shaped steam generator - 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] J2 <Industrial Application Fields> The present invention (J tanker (■ High-speed increase! l' 1N reactor's raw material f' However, it relates to an integrated annular steam generator provided in the vessel) (be.

<Prior Art> Figures 3 to 5 show the structure of a conventional annular steam generator.

Figure 3 (bl is a sectional view taken along the line A and -A in Figure 3 (a),
The figure is a sectional view taken along the line B-B of Figure 3 (l).

The flow of thorium (cooling area) inside the reactor vessel 20 is shown by the arrow in FIG.・Nano・(High Temperature-jL Tsum) 28 to Annular Steam Generator Heat Transfer Tube 2:3
Through heat exchange 17, it becomes cooled thorium and returns to Dobe='vnum 29. The lower pump 29 is sucked in from the lower end of the circulation pump 30 and enters the reactor core as a high-pressure gas of 1.11 mm. .

Circular one-person steam generator 4-unit σ] Water system is supplied from the water supply fl, water supply side heat exchanger tube 25a in the reactor vessel 20 from the soda 23
While heating the tube 1, it is sent to the intermediate header 27 while rotating in the circumferential direction, and is then heated by the inner steam-side heat transfer tube 25), where it becomes steam and is sent to the intermediate header 24.
reach. The annular steam generator described in - is connected to equipment that has a function of detecting the presence or absence of damage to the heat transfer tubes 25.
to the water system/ladder (water supply header 23. intermediate header 27
．． Install a gas golenum 26 inside the steam header 24). The heat transfer tube 25 uses a known multiple tube, and a fluid passage provided between the inner tube and the central tube (not shown) is connected to the .\lium gas valve 1/num 26, and the . An abnormality can be detected by sampling the gas in the num 26. Among the heat exchanger tubes 25, the reactor vessel 20
The temperature of the reactor vessel 20 can be lowered by having the water supply side heat exchanger tube 25a having a lower temperature on the outside near the reactor vessel 20. Heat exchanger tube 25, water supply header 23, intermediate header 27 and steam-\ladder 2
The joining with each tube sheet No. 4 is performed after each tube sheet is installed on the roof slab 22. That is, a construction method is used in which the heat exchanger tubes 25 and the tube plate are welded by performing welding work at the installation site of the plant.

<Problems to be Solved by the Invention (7)> In the conventional annular steam generator, by using the heat transfer tubes on the reactor vessel 20 side as the water supply side heat transfer tubes 25n, the low temperature on the reactor vessel 20 side We are trying to make this happen.

However, even if the water supply side heat exchanger tube 25a is provided at a low temperature, since it is routed in the circumferential direction, the water is heated and heated while flowing therein, and a temperature distribution occurs in the circumferential direction in the water supply side heat exchanger tube 25a. I will know. This circumferential temperature distribution may give the reactor vessel 20 a circumferential temperature distribution, even if it is slight. Additionally, as a result, the effect of reducing the temperature of the reactor vessel 20 is greater than when the heat exchanger tubes located closest to the reactor vessel 20 are configured uniformly in the circumferential direction in the lowest temperature region of the water supply side heat exchanger tubes. becomes smaller.

In addition, with conventional annular steam generators, the heat exchanger tubes 25 and tube sheets must be welded at the plant installation site, which requires long hours of work and inspection to ensure reliable welding. Construction costs will increase.

The present invention has been made in view of the above-mentioned circumstances, and improves the circumferential temperature distribution and temperature reduction effect of the reactor vessel over the conventional example. It is an object of the present invention to provide an integrated annular steam generator having a structure that allows it to be transported to a Golant installation site in one piece after welding.

Means for Solving the Problems> In order to improve the uniformity of temperature distribution in the circumferential direction, the heat exchanger tubes are arranged under uniform conditions over the entire circumferential direction. moreover,
In order to efficiently reduce the temperature of the reactor vessel, the lowest temperature part of the water supply side heat transfer tube is efficiently arranged on the reactor vessel side.

As a means of arranging the heat exchanger tubes as described above, the tube plate part is an integral annular structure, the outer periphery is the tube plate area on the water supply side, and the heat exchanger tubes on the water supply side are arranged vertically over the entire circumference. Lower it, route it circumferentially at the bottom end, and then raise it vertically again.
Connect to the steam side tube sheet on the inner circumferential side. The heat exchanger tubes are routed so that they are rotationally symmetrical in the circumferential direction, and the temperature distribution in the circumferential direction is made uniform.

In order to be able to transport the heat exchanger tubes to the site with the heat transfer tubes attached to the annular tube plate, the structure of the tube plate is built into the outer peripheral area of the roof slab. After that, the structure is shaped so that the inner peripheral region of the roof slab can be incorporated inside the annular tube sheet portion.

Therefore, the integrated annular steam generator of the present invention has a structure in which an annular tube plate is integrally formed with an outer water supply tube plate and an inner steam tube plate, and the water supply/lag is placed on the water supply tube plate. The steam/rudder is placed on the steam tube plate, and the annular roof slab assembly part formed at the bottom of the annular tube plate is placed between the outer and inner roof slabs of the reactor. The water supply heat exchanger tubes connected to the water supply tube plate and descending vertically, and the steam side heat exchanger tubes connected to the steam tube plate and descending vertically are routed in the circumferential direction at the lower end (7 consecutive heat exchanger tubes form,
The heat transfer tubes were suspended between double concentric cylindrical shells arranged inside the reactor vessel in the upper part of the reactor.

<Operation> By lowering the water supply heat exchanger tube vertically and uniformly in the circumferential direction to the outer circumferential side of the annular tube sheet, the lowest temperature part of the water supply heat exchanger tube is brought circumferentially to the area closest to the reactor vessel. It becomes possible to arrange them uniformly. The lowest temperature part of the heat transfer tubes on the water supply side is uniformly located in the region of the heat transfer tubes on the side closer to the reactor vessel, and this becomes the heat absorption area, so the temperature of the reactor vessel can be reduced most efficiently, and It is also possible to eliminate the intensity distribution.

<Example> Fig. 1 is a plan view also showing a partial cross section (cross section taken along line C-C in Fig. 2) of a nuclear reactor equipped with an embodiment of the integrated annular steam generator of the present invention; (This is a partial vertical cross-sectional view of a nuclear reactor showing an embodiment of an integrated annular steam generator.

The outer water supply tube plate 4 and the inner steam tube plate 5 are integrally formed into an annular tube plate. The water supply ladder 2 is on the water supply pipe plate 4, the steam ladder 3 is on the steam pipe plate 5, and the bottom of the distribution water pipe plate 4 and the steam pipe plate 5 is・＼
An annular roof slab assembly part 13 is formed through the aluminum gas pipe 6, and the roof slab assembly part 13 is disposed between the outer roof slab 1a and the inner roof slab 1b. . -7 Slab assembly part 13 (formed on the outside of the main body) -7 Slab support base 1
The inner/L-fu slab support 13b is supported by the outer roof slab 1a on the lower surface of the outer roof slab 1a and is integrally formed inside the roof slab assembly part 13, and supports the inner roof slab 13b on its upper surface. .

The heat exchanger tube 7 is suspended between double concentric cylinders 112 provided inside the reactor vessel 10 of the reactor upper part 17, and is fixed to the heat exchanger tube report circle n9. The water supply side heat exchanger tubes 78 are connected to the water supply tube plate 4, descend vertically, route in the circumferential direction at the lower end, rise vertically again to form the steam side heat exchanger tubes 7b, and connect to the inner peripheral side steam tube plate. Connect to 5. The heat exchanger tubes 7 are routed so that they are rotationally symmetrical in the circumferential direction. Therefore, the water supply side heat exchanger tube 7a connects the steam generator low humidity region 14 to the steam side heat exchanger tube 7a.
)) form a steam generator hot region 15, respectively.

Water entering from the water supply pipe 2 passes through the water supply pipe plate 4, enters the heat transfer tube 7, and enters the water supply side heat transfer tube 7 on the reactor vessel 10 side.
A is lowered by 1 and heated to become steam, which rises through the steam side heat exchanger tube 7b and reaches the steam rudder 3 from the steam tube plate 5. The heat exchanger tube 7 is a double or triple multiple tube in the part below the ladder 6, and the heat exchanger tube 7 is a double or triple tube. From this step, it is possible to detect whether or not there is an abnormality in the heat exchanger tubes 7.

-Next cooling system) L12
The cylindrical inner shell 1.2b flows into the heat exchanger tube 7 section of the steam generator through the opening 16 at the upper end and exits from the lower end.

When installing the steam generator of the present invention into the reactor vessel 10,
The steps for assembling the roof slab assembly part 13, the upper water supply parts 2, 4, the steam parts 3, 5, the helium gas supply/exhaust/rudder 6, and the heat exchanger tube parts 7, 9 as one body are as follows: 7 After installing the slab 1a and the double concentric cylindrical shell 12, the body structure is assembled at the center around the roof slab installation part 13, 7? , and then the inner circumferential roof slab 1)) shall be incorporated, and the loop 7 of the - type circular steam generator of the present invention
The slab assembly portion 13 has a structural shape that allows such assembly. This integrated structure can be manufactured in a factory. In addition, considering the ease of maintenance work such as ladder work in case of damage to the heat transfer tube 7, the water supply and
Although it is better to separate the rudder 2 and the steam header 3 in the circumferential direction, the water supply rudder 2 and the steam header 3 may each be formed integrally in an annular shape in the circumferential direction.

<Effects of the Invention> As explained in detail above, the integrated annular steam generator of the present invention has a structure in which the tube sheet portion is made into an annular shape and can be incorporated into the roof slab (7). It becomes possible to manufacture the system as an integrated unit in a factory and then transport it and install it on-site.This makes it possible to perform the joining work and inspection of tube sheets and heat exchanger tubes at the factory, and to carry out these tasks on-site. Compared to the case where the work is done manually, the work period is shortened and costs can be reduced.

By arranging the heat exchanger tubes and heat exchanger tubes, it is possible to arrange the heat exchanger tubes on the water supply side uniformly in the circumferential direction and at a low temperature on the reactor vessel side, and by eliminating the circumferential temperature distribution of the reactor vessel, the temperature 6°, which allows for a larger design margin for the structural strength of the reactor vessel than in conventional examples.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a partial cross section (cross section taken along the line C-C in Fig. 2) of a nuclear reactor equipped with an embodiment of the integrated annular steam generator of the present invention; A partial vertical sectional view of a nuclear reactor showing an example of an annular steam generator, FIG.
Figure (b) is a cross-sectional view taken along the line A-A in Figure 3 (a), Figure 4 is a vertical cross-sectional view of a conventional annular steam generator, and Figure 5 (from Figure 3 (
It is a BB line sectional view of b). 1a Outer circumference L-T7 slab, lb Inner circumference roof slab, 2, 23 Water supply header, 3, 24 Steam/Soso, 4 Water supply pipe plate, 5 Steam tube plate, 7, 25 Heat exchanger tube, 7a, 25a Water supply side heat exchanger tube, 7b A25b Steam side heat exchanger tube, 10.20 Reactor vessel, 122 vertical 1i7J core cylindrical shell, 12a cylindrical outer shell, 12b cylindrical inner hole, 13, Luno slab built-in Department,

Claims (1)

[Claims] An annular tube plate is integrally formed with an outer water supply tube plate and an inner steam tube plate, a water supply header is mounted on the water supply tube plate, a steam header is mounted on the steam tube plate, and the annular pipe An annular roof slab assembly part formed at the bottom of the plate is arranged between the outer and inner roof slabs of the reactor, and the water supply side heat transfer tubes and the steam pipes are connected to the water supply pipe plate and descend vertically. A double concentric cylindrical shell in which a steam-side heat transfer tube connected to a plate and vertically descending is routed in the circumferential direction at the lower end to form a continuous heat transfer tube, and the heat transfer tube is arranged inside the reactor vessel in the upper reactor plenum. An integrated annular steam generator characterized by being suspended between.