JPS63309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a lined storage tank applied to a condensate storage tank or the like of a nuclear power plant.

(Prior Art) A nuclear power plant such as a boiling water nuclear power generation facility is provided with a condensate storage tank for storing condensate. However, since conventional condensate storage tanks are installed on a site separate from the various buildings of the plant, it is necessary to form a concrete foundation for installing the condensate storage tank, which requires a large amount of ground and excavated soil for the plant. There was a drawback that increased the

Furthermore, in order to protect the conventional condensate storage tank from radiation from the stored water, a concrete shielding wall with the same height as the tank must be formed around the tank, resulting in an increase in the size of the tank. It was also a major factor in increasing construction costs.

Therefore, in order to eliminate the above-mentioned drawbacks, lining storage tanks 6a and 6b are provided in the reactor building 1 made of reinforced concrete as shown in Figs. 1 and 2, and condensate is stored in these lining storage tanks 6a and 6b. It has been proposed that
117376, Japanese Patent Publication No. 57-40691). In FIGS. 1 and 2, reference numeral 2 denotes a reactor containment vessel provided in the center of the reactor building 1, and a reactor pressure vessel 3 is housed inside the reactor containment vessel 2. In addition, 4 and 5 in the figure are building walls and floor slabs that divide the reactor building 1 into a number of rooms, and these building walls 4 and floor slabs 5 ensure the seismic strength of the reactor building 1. Moreover, it is designed to resist the surrounding earth pressure.

The lining storage tanks 6a, 6b are provided underground in the reactor building 1, and a lining plate 10 made of stainless steel is stretched on the inner wall surface thereof. Further, a pipe 7 is connected to the bottom of the lining storage tanks 6a, 6b, so that the condensate stored in the lining storage tanks 6a, 6b can be introduced into the reactor pressure vessel 3 by a pump 8. The piping 7 is provided with an on-off valve 9, and by closing the on-off valve 9, only the condensate in the lining storage tank 6b is introduced into the reactor pressure vessel 3. In addition, ceiling slabs 11a and 11b of the reactor building 1 where the lining storage tanks 6a and 6b are installed.
are provided with manholes 12a, 12b for inspection, and inside the lining storage tanks 6a, 6b are passages 13a, 13b and ladders 14a, 14b for inspection.
14b is provided. Moreover, 15 in the figure is a water level detector for detecting the water level of the lining storage tanks 6a, 6b.

(Problems to be solved by the invention) By the way, the conventional lined storage tanks 6a, 6b
(In particular, the lining storage tank 6a) is located underground adjacent to the outer wall of the reactor building 1, so there is a problem that in the event of a leak, it is not possible to distinguish between water that enters through the outer wall and leaked water. . Also,
Lined storage tank 6 to receive the surrounding earth pressure directly.
There was also the problem that if the volumes of a and 6b were made too large, the seismic strength and soil resistance of the reactor building 1 would decrease.

The present invention was made with attention to these problems, and its purpose is to store a large amount of condensate without reducing the seismic strength and soil strength of the reactor building. Moreover, it is an object of the present invention to provide a lined storage tank in which leaked water can be immediately detected when leakage occurs.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a structure in which the reactor building is separated from the outer wall of the concrete reactor building and the reactor containment vessel by at least one room. A concrete lined storage tank body installed in the basement of It is characterized by comprising: a lining plate stretched over the surface of the horizontal reinforcing beam and the inner wall surface of the storage tank body; and a leakage detection groove provided along the weld line of the lining plate.

(Function) In the present invention, by providing the lining storage tank body at least one room apart from the outer wall of the concrete reactor building and the reactor containment vessel, in the event of a leak, water that enters through the outer wall and leaked water can be separated. can be distinguished. In addition, by installing concrete horizontal reinforcing beams on the side walls of the lining storage tank body, which are integrated with the reactor building and at the same height as the floor slab of the reactor building, the earthquake resistance and earth pressure resistance of the reactor building are reduced. This makes it possible to increase the volume of the lining storage tank body.

(Example) An example of the present invention will be described below with reference to FIGS. 3 to 6. In the figure, reference numeral 101 denotes a semi-underground reactor building made of reinforced concrete, and a reactor containment vessel 102 containing a reactor pressure vessel 103 is formed approximately in the center of the reactor building 101. Between this reactor containment vessel 102 and the outer wall of the reactor building 101, there is a reactor building 10
Building wall 104 for dividing the inside of 1 into a large number of rooms
and a floor slab 105 are provided, and the reactor building 1 is constructed by these building walls 104 and floor slab 105.
01 seismic strength and is designed to withstand the surrounding earth pressure.

Further, a concrete lined storage tank main body 106 is provided underground in the reactor building 101, separated from the outer wall of the reactor building 101 and the reactor containment vessel 102 by at least one room. A horizontal reinforcing beam 110 made of reinforced concrete is attached to the side wall portion 111 of the lining storage tank body 106.
1 and the floor slab 10 of the reactor building 101
5, and prevents the earthquake resistance and earth pressure resistance of the reactor building 101 from decreasing.

Furthermore, a lining plate 112 made of stainless steel is stretched over the inner wall surface of the lining storage tank body 106 and the surface of the horizontal reinforcing beam 110. As shown in FIG. 6, this lining plate 112 is welded to shapes 121 and 122 provided at the corner of the horizontal reinforcing beam 110 and the side wall 111 of the lining storage tank 106. The shapes 121 and 122 are the corners of the horizontal reinforcing beam 110 and the lining storage tank 106.
The shape material 113', 1 embedded in the side wall part 111 of
14' and 115', and these shapes allow the leakage detection groove 123 to connect to the lining plate 112.
It is formed along the weld line. Therefore,
If leakage occurs at the welded part of the lining plate 112,
The leaked liquid flows inside the leak detection groove 123 and is detected by a leak detector (not shown) provided at the end of the leak detection groove 123. Note that a pipe 107 for introducing condensate into the reactor pressure vessel 103 by a pump 108 is connected to the bottom of the lining storage tank body 106. Also,
A manhole 117 for inspection is provided in the ceiling slab 116 of the reactor building 101 where the lining storage tank body 106 is provided, and a passage 118 and a ladder 119 for inspection are provided inside the lining storage tank body 106. . Also, 12 in the figure
0 is a water level detector for detecting the water level of the lining storage tank main body 106, and 109 is an inflow pipe for introducing condensate into the lining storage tank main body 106.

As described above, in this embodiment, the lining storage tank main body 106 is provided at least one room apart from the outer wall of the reactor building 101 and the reactor containment vessel 102, so that in the event of a leak, water that enters through the outer wall and Can be distinguished from leaked water. In addition, since horizontal reinforcing beams 110 made of reinforced concrete are installed on the side wall 111 of the lining storage tank body 106 at the same height as the floor slab 105 of the reactor building 101, the seismic strength and earth pressure strength of the reactor building 101 are prevented from decreasing. This makes it possible to increase the volume of the lining storage tank body 106. Furthermore, in this embodiment, the lining storage tank main body 106 has a vertically elongated shape, and its horizontal cross-sectional area is small compared to its volume, which reduces the impact received by sloshing (liquid surface waves) during an earthquake. be able to.

[Effects of the Invention] As explained above, according to the present invention, a large capacity of condensate can be stored without reducing the seismic strength and earth pressure strength of the reactor building, and moreover, in the event of leakage, It is possible to provide a lined storage tank in which leakage water can be immediately detected.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional example, Figure 1 is a vertical cross-sectional view of a reactor building, Figure 2 is a vertical cross-sectional view of a lining storage tank, and Figures 3 to 6 are an embodiment of the present invention. Figure 3 is a vertical cross-sectional view of the reactor building, Figure 4 is a vertical cross-sectional view of the lining storage tank, and Figure 5 is a vertical cross-sectional view of the lining storage tank.
FIG. 6 is a sectional view taken in the direction of the - arrow in the figure, and a perspective view showing the mounting structure of the lining plate. 101...Reactor building, 102...Reactor containment vessel, 103...Reactor pressure vessel, 106...Lining storage tank body, 110...Horizontal reinforcing beam, 11
2...Lining plate, 123...Leakage detection groove.

Claims (1)

[Claims] 1. A concrete lined storage tank body provided underground in the reactor building separated by at least one room from the outer wall of the concrete reactor building and the reactor containment vessel, and a side wall of the lined storage tank body separated from the reactor building by at least one room. A horizontal reinforcing beam made of concrete installed integrally with the floor slab of the reactor building and at the same height as the floor slab of the reactor building, a lining plate stretched over the surface of this horizontal reinforcing beam and the inner wall surface of the storage tank body, and this lining plate. and a leakage detection groove provided along the weld line of the lined storage tank.