JPH0750190B2 - Reactor building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a reactor building of a boiling water nuclear power plant,
Particularly, it relates to the improvement of the reactor building where the condensate storage tank is installed as a lining tank in the building.

(Prior art) In a boiling water nuclear power plant, for example, treating agent water from a radioactive liquid waste treatment facility such as a condensate demineralizer or pure water from a pure water makeup water facility that is fresh water makeup water. It is well known that a condensate storage facility is installed to store makeup water and to be a source of makeup water for each power plant equipment, piping, and primary power plant system. Since this condensate storage facility will be a large tank with a capacity of around 3000 m ³ , it was conventionally installed mainly outside the reactor building, but effective use of site space and removal and management of tank foundation structures etc. Recently, for the purpose of facilitating the installation, it is often installed in the reactor building as a condensate storage tank consisting of a lining tank.

FIGS. 4 and 5 show a conventional example of such a reactor building with a built-in condensate storage tank.

The reactor building 1 includes a primary containment facility 5 that surrounds the reactor containment vessel 4, an inner box wall 6 that surrounds the outside of the primary containment facility 5, on a mat concrete 3 that is installed at a portion lower than the surface 2 of the site. Furthermore, by raising an external box wall 7 or the like as a building outdoor wall that surrounds the outside and partitioning the space defined by these into upper and lower slab walls 8,
An equipment pit or a spent fuel storage pool 9a, 9b, a reactor room 10, a pressure suppression room 11, etc. are formed.

In such a conventional reactor building 1, the condensate storage tank 12
Is an intermediate box wall arranged inside the outer box wall 7.
Inner surface of 13 and outer surface of inner box wall 6 and top plate slab 14
Of the bottom plate, the upper surface of the bottom plate slab 15, and the inner surfaces of the side walls 16 and 17 are lined. As a result, the condensate storage tank 12 can be installed in the spaces 18a, 18b, 18c, 18d from the building exterior.
It is installed in the building through. Since the stored water in the condensate storage tank 12 is a radioactive fluid, even if the stored water leaks from the welded portion of the lining plate, etc., it is considered that the radioactive fluid does not leak directly to the outside. .

By the way, even when the condensate storage tank 12 is installed indoors in this way, its capacity is as large as about 3000 m ³ and, in addition, a storage space for auxiliary equipment such as a valve space is required. The space on the outdoor side of the building, especially the building structure including the lateral spaces 18b and 18c, will be extremely large. That is, even if a part of the spaces 18b and 18c can be used as a passage or the like, it is not indispensable and almost becomes a dead space. For this reason, the capacity of the building is unnecessarily increased, and the construction cost is correspondingly high.

Further, the outside of the condensate storage tank 12 is a structure having a high earthquake resistance grade, and the structure covered with the double outer wall requires a large amount of concrete, which also leads to an increase in cost.

By the way, in a nuclear power plant, an auxiliary cooling water system is provided in order to cool various devices installed in the reactor building. This auxiliary machine cooling water system mainly uses seawater as a cooling water source. That is, outside the reactor building 1, as shown in FIG. 4, a box-shaped auxiliary cooling water system pipe trench 19 having a box-shaped cross section for storing pipes for guiding seawater, a cable tray, etc. is installed underground. There is. The supply cooling water system piping trench 19 is a large-scale concrete structure because it has a plurality of large-diameter pipings for transferring a large amount of cooling water.

As shown in the lower right part of FIG. 4, the reactor building 1 contains a radioactive fluid containing tank 12a for storing radioactive fluid for waste.
For example, four are provided. Even in the case of this radioactive fluid containing tank 12a, the condensate storage tank 12 is provided as a means for preventing fluid leakage.
The double wall structure provided with the spaces 18e and 18f similar to the above case is adopted, and the same problem as described above occurs.

(Problems to be solved by the invention) In a conventional reactor building, a condensate storage tank is installed on the building exterior wall to prevent leakage of radioactive fluid directly to the building exterior and to detect leakage. It is designed not to be installed directly on the. For this reason, a space is created between the condensate storage tank and the building exterior wall, and part of it can be used as a passageway, but most of it becomes a dead space, unnecessarily increasing the building capacity and increasing costs. ing.

Also, regarding the auxiliary equipment cooling water system piping trench, the amount of materials used is large, including the amount of excavated civil engineering, leading to higher costs.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a reactor building capable of reducing the dead space of the reactor building and preventing leakage of stored water at the same time, and reducing the amount of concrete. And

[Structure of Invention]

(Means for Solving the Problems) The present invention is, in a reactor building of a boiling water nuclear power plant, on the inner surface side near the underground buried portion of the building outdoor wall, comprising a lining tank having the building outdoor wall as one side wall. A box-shaped condensate storage tank was provided, and a box-shaped auxiliary cooling water system piping trench was located outside the building of the condensate storage tank, with the underground buried part of the building exterior wall as one side wall. It is characterized by.

(Operation) By installing the condensate storage tank directly on the inner surface of the outer wall of the building and by installing the auxiliary equipment cooling water system piping trench on the outer surface of the outer wall, the trench is provided between the condensate storage tank and the environment of the outdoor building underground area. The space can be secured, and there is no risk of direct leakage of leaked water to the environment. The space occupied by the condensate storage facility can be reduced, and the cost can be reduced by reducing the size of the building.

In addition, by sharing one side wall of the condensate storage tank, the outdoor side wall of the building, and the side wall of the building side of the auxiliary equipment cooling water system piping trench as an integrated structure, the amount of concrete in high earthquake-resistant structures can be significantly reduced. .

Further, by installing the auxiliary equipment cooling water system piping trench integrally on the outdoor wall of the building, it is not necessary to consider the earth pressure of the underground part for the condensate storage tank installed on the outer wall of the building.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The reactor building 21 is a primary containment facility 25 that surrounds the reactor containment vessel 24 on a mat concrete 23 that is installed in a portion lower than the ground surface 22 of the site, and an inner box wall 26 as a secondary containment facility that surrounds the outside thereof. Furthermore, by raising the external box wall 27 etc. as a building outdoor wall surrounding the outside, and partitioning the space demarcated by these with the slab wall 28 up and down,
An equipment pit or a spent fuel storage pool 29a, 29b, a reactor room 30, a pressure suppression room 31, etc. are formed.

In this, a box-shaped condensate storage tank 32 consisting of a lining tank having the outer box wall 27 as one side wall is arranged underground approximately half in the height direction on the inner surface side near the underground buried portion of the outer box wall 27. It is provided. This condensate storage tank
32 is configured by lining the inner surface of the outer box wall 27, the outer surface of the inner box wall 26, the lower surface of the top plate slab 33 and the upper surface of the bottom plate slab 34, and the inner surfaces of the side walls 35, 36.
It stores treated water from a liquid waste treatment device (not shown) and pure water make-up water from a pure water make-up water facility, and serves as a source of make-up water to various devices, pipes, and primary systems in the power plant.

Further, a box-shaped auxiliary equipment cooling water system piping trench 37 having an underground buried portion of the outer box wall 27 as one side wall is provided on the outdoor side of the condensate storage tank 32. That is, this auxiliary equipment cooling water piping trench 37 is provided integrally with the reactor building 31,
In addition, the outside of a substantially lower half of the condensate storage tank 32 is covered. Incidentally, although not shown, the auxiliary water cooling system piping trench 37 accommodates seawater introduction piping, a cable tray, and the like.

According to the reactor building 21 having such a configuration, the condensate storage tank 32
Since it is not necessary to provide a space between the outer box wall 27 and the outer box wall 27, the capacity of the reactor building 21 can be reduced and the cost can be reduced.

Regarding the stored water leak detection by installing the condensate storage tank 32 adjacent to the outer box wall 27, the auxiliary equipment cooling water system piping trench 37 is integrally installed outside the outer box wall 27 to cool the auxiliary equipment. The detection can be performed in the water system piping trench 37, and the reliability of the leak detection of the condensate storage tank 32 can be maintained as in the conventional case.

Furthermore, the outer wall of the condensate storage tank 32, the outdoor wall of the building, and the building side wall of the auxiliary cooling water system piping trench 37 have an integrated structure, which reduces the amount of high-pressure earthquake-resistant meat pressure structures,
The amount of concrete can be reduced by that much, and cost can be reduced in this sense as well.

In addition, the auxiliary equipment cooling water system piping trench 37 is connected to the outer box wall 27.
Since it is integrally installed on the outer side of the outer box wall, it is not necessary to consider the earth pressure of the underground part with respect to the condensate storage tank 32 installed adjacently on the inner side of the outer box wall 27.

In the present invention, for example, a radioactive fluid-containing tank can be applied as the condensate storage tank. That is, in the reactor building 21 of the above-mentioned embodiment, as shown in the lower right half of FIG. 1, a small box-shaped radioactive fluid containing tank 38 for storing the radioactive fluid for disposal is underground in the outer box wall 27. A plurality of, for example, four, lining tanks are provided inside the buried portion.
As shown by the phantom line on the outside of this radioactive fluid containing tank 38,
The accessory cooling water system piping trench 39 may be provided. With such a structure, it is not necessary to provide an extra space as a passage as in the conventional case shown in FIG. 4 on the outside of the radioactive fluid containing tank 38, and it is similar to the case where the condensate storage tank 32 is applied. The effect of is played.

Incidentally, in the embodiment shown in FIG. 1 and FIG.
Although the auxiliary equipment cooling water system piping trench 37 is configured to have one chamber, it may be an auxiliary equipment cooling water system piping trench 37a having upper and lower two chambers, as shown in FIG. Of course, in the embodiment shown in FIG. 3 as well, the same effect as that of the above-mentioned embodiment is obtained.

〔The invention's effect〕

As described above, according to the present invention, by constructing one side wall of the condensate storage tank with the building outdoor wall portion, and by integrating the building side one sidewall of the auxiliary cooling water system piping trench with the building outdoor wall portion, The indoor dead space can be reduced, and the building's capacity can be reduced, which in turn can reduce costs. Further, the possibility of direct leakage of stored water from the condensate storage tank to the environment can be detected by the equipment cooling water system piping trench, so high reliability can be secured. Moreover, one side wall of the condensate storage tank, the outdoor building wall, and the one side wall of the auxiliary cooling water system piping trench on the building side are integrated,
Since it is shared, the amount of concrete in high earthquake-resistant structures can be reduced. Further, by integrally installing the auxiliary equipment cooling water piping trench on the outside wall of the building, consideration of earth pressure in the underground part for the condensate storage tank installed on the outer wall part of the building can be eliminated.

[Brief description of drawings]

1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a vertical sectional view showing another embodiment of the present invention. FIG. 5 is a vertical sectional view showing a conventional example, and FIG. 5 is a sectional view taken along line VV of FIG. 21 …… Reactor building, 27 …… Building outdoor wall (external box wall), 32 …… Condensed water storage tank, 37 …… Device cooling water piping trench, 38 …… Radioactive fluid containing tank.

Claims (3)

[Claims] 1. In a reactor building of a boiling water nuclear power plant, a box-shaped condensate storage tank consisting of a lining tank with the building exterior wall as one side wall is provided on the inner surface side of the building exterior wall near the underground buried portion. At the same time, a box-shaped auxiliary cooling water system piping trench having an underground buried portion of the building outdoor wall as one side wall is provided outside the building of the condensate storage tank. 2. The condensate storage tank retains the treating agent water from the liquid waste treatment equipment and the pure water make-up water from the pure water make-up water equipment, and replenishes it to various equipment in the power plant, piping and primary system of the power plant. The reactor building according to claim 1, which is used as a water source. 3. The reactor building according to claim 1, wherein the condensate storage tank is a radioactive fluid containing tank for storing a radioactive fluid for disposal.