JP2001056392A - Ventilation structure of spent fuel storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ventilate by natural ventilation even in an underground type. SOLUTION: The ventilation structure of a spent fuel storage facility is structured by isolating the first underground continuous wall 14a from the building outside wall so that a hollow space 15a is formed between the wall and the first building outside wall 12a, and the hollow space 15a is respectively connected to the air through a ground side opening 16a and to the inside of the spent fuel storage facility through a suction inlet 2. Also, the second underground continuous wall 14b is structured by isolating the wall from the building outside wall so that a hollow space 15a is formed between the wall and the second building outside wall 12b, and the hollow space 15b is respectively connected to the air through a ground side opening 16b and to the inside of the spent fuel storage facility through a exhaust outlet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ventilation structure for a spent fuel storage facility in a nuclear power plant.

[0002]

2. Description of the Related Art A nuclear power plant has a spent fuel storage facility for storing spent fuel. The spent fuel burned in a nuclear reactor is used until it is transported to a reprocessing plant. Primary storage in fuel storage facilities, reducing radioactivity and decay heat.

[0003] In order to release the decay heat generated from the spent fuel, the spent fuel storage facility is provided with a ventilation system as shown in FIG. That is, the ventilation system shown in FIG. 1 includes a suction port 2 provided at the lower part of the building outdoor wall of the spent fuel storage facility 1 and an exhaust port 3 provided at the upper part of the building outdoor wall. Air is guided into the building in the direction of the arrow in the figure, and is exhausted from the exhaust port 3 by a so-called natural ventilation system, thereby releasing the decay heat of the spent fuel to the outside.

[0004]

Here, for example, when excavating a surface layer of the ground to expose a good-quality bedrock and installing a nuclear power plant on the bedrock, the surroundings of the outer wall of the spent fuel storage facility are damaged. It will be covered with backfill soil, and the ventilation equipment as described above cannot be used.

[0005] Therefore, in such a case, it is necessary to take measures such as switching the ventilation equipment to the forced ventilation system, which raises a problem that the running cost is increased and the economy is disadvantageous.

The present invention has been made in view of the above circumstances, and has as its object to provide a ventilation structure for a spent fuel storage facility that can be ventilated by a natural ventilation system even underground. I do.

[0007]

In order to achieve the above object, a ventilating structure for a spent fuel storage facility according to the present invention, as described in claim 1, has an inlet below the outdoor wall of the first building, A ventilated structure of a spent fuel storage facility having an exhaust port provided above an outdoor wall of a second building, wherein a first underground continuous wall is constructed at a distance from the outdoor wall of the first building. A hollow space that is sandwiched between the underground continuous wall and the outdoor wall of the first building and communicates with the atmosphere communicates with the inside of the spent fuel storage facility through the suction port, and the second building A second underground continuous wall is constructed at a distance from the outer wall, and a hollow space which is interposed between the second underground continuous wall and the second building outdoor wall and communicates with the atmosphere is provided through the exhaust port. And communicates with the inside of the spent fuel storage facility.

In the ventilated structure for a spent fuel storage facility according to the present invention, a hollow space sandwiched between the first underground continuous wall and the first outdoor building wall and communicating with the atmosphere is formed in the first outdoor building wall. The second building communicates with the interior of the spent fuel storage facility through the lower suction port, and has a hollow space sandwiched between the second underground continuous wall and the second outdoor building wall and communicating with the atmosphere. It communicates with the inside of the spent fuel storage facility through an exhaust port above the outer wall.

In this case, the hollow space sandwiched between the first underground continuous wall and the first building outdoor wall becomes an air supply duct,
Air inhaled from the ground side opening of the hollow space is sent into the spent fuel storage facility from the suction port below the first building outdoor wall, and is sandwiched between the second underground continuous wall and the second building outdoor wall. The hollow space thus formed serves as an exhaust duct, and the air that has exited from the air outlet above the second building outdoor wall is discharged to the atmosphere through the ground-side opening of the hollow space.

[0010] The first underground continuous wall and the second underground continuous wall are typically installed at opposing positions across the spent fuel storage facility, but are not necessarily at opposing positions across the spent fuel storage facility. It is not necessary to construct, and if the required amount of air flow by natural ventilation can be secured, it may be constructed so that the plane is orthogonal to the plane, that is, the plane shape is L-shaped, or it is the plane series position. May be constructed. In any case, the hollow space between the first underground continuous wall and the first building outdoor wall and the hollow space between the second underground continuous wall and the second building outdoor wall communicate with each other. Partition walls and the like are provided as appropriate so as not to be caused.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ventilation structure for a spent fuel storage facility according to the present invention will be described below with reference to the accompanying drawings. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.

FIG. 1 is a vertical sectional view showing a ventilation structure of a spent fuel storage facility according to this embodiment, and FIG.
It is the top view seen from the A line direction. As can be seen from these figures, the ventilating structure of the spent fuel storage facility according to the present embodiment has a suction port 2 below the first building outdoor wall 12a and an exhaust port 3 above the second building outdoor wall 12b. Each of the spent fuel storage facilities 11 is applied to each of the provided spent fuel storage facilities, and the spent fuel storage facility is placed underground so as to be sandwiched between the first underground continuous wall 14a and the second underground continuous wall 14b. Has been built.

Here, the first underground continuous wall 14a is
Is constructed so as to be separated from the building outdoor wall so that a hollow space 15a is formed between the building and the outdoor wall 12a.
5a is connected to the atmosphere through the ground side opening 16a, and the spent fuel storage facility 11 is connected through the suction port 2.
It is communicated inside.

On the other hand, the second underground continuous wall 14b is constructed so as to be separated from the outdoor building wall so that a hollow space 15b is formed between the second underground continuous wall 14b and the second building outdoor wall 12b.
b communicates with the atmosphere through the ground-side opening 16b and communicates with the inside of the spent fuel storage facility 11 through the exhaust port 3.

When the first underground continuous wall 14a and the second underground continuous wall 14b are respectively constructed in parallel with a rectangular horizontal section and the spent fuel storage facility 11 has a rectangular horizontal section, The ground-side openings 16a and 16b are
As can be seen clearly in FIG.

In constructing the spent fuel storage facility 11, first, the first underground continuous wall 1 is formed using a known method.
4a and the second underground continuous wall 14b are constructed from the ground, and then the area sandwiched between the underground continuous walls is excavated and excavated, and then excavated so that the hollow spaces 15a and 15b are formed. The spent fuel storage facility 11 may be constructed on the bottom, for example, on the bedrock.

In the ventilation structure for a spent fuel storage facility according to the present embodiment, a hollow space 15a which is interposed between the first underground continuous wall 14a and the first outdoor building wall 12a and communicates with the atmosphere is formed in the first space. The inside of the spent fuel storage facility 11 is communicated with the inside of the spent fuel storage facility 11 through the suction port 2 below the first building exterior wall 12a, and is sandwiched between the second underground continuous wall 14b and the second building exterior wall 12b and exposed to the atmosphere. The communicating hollow space 15b is
The inside of the spent fuel storage facility 11 is communicated with the inside of the spent fuel storage facility 11 through the exhaust port 3 above the building outdoor wall 12b.

In this manner, the air warmed by the decay heat from the spent fuel tends to rise in the spent fuel storage facility 11, and the air is pressured in the inlet 2 in the inflow direction and in the exhaust 3 in the outflow direction. Works.

Therefore, the first underground continuous wall 14a and the first underground
The hollow space 15a sandwiched between the building outdoor walls 12a serves as an air supply duct, and the air sucked in from the ground side opening 16a of the hollow space flows from the inlet 2 along the direction shown by the arrow in the figure to the spent fuel storage facility. 11 inside
The hollow space 15b sandwiched between the second underground continuous wall 14b and the second building outdoor wall 12b serves as an exhaust duct, and the air that has exited from the air outlet 3 is released to the atmosphere through the ground-side opening 16b of the hollow space. You.

As described above, according to the ventilation structure for a spent fuel storage facility according to the present embodiment, the ventilation structure is sandwiched between the first underground continuous wall 14a and the first building outdoor wall 12a and exposed to the atmosphere. The communicating hollow space 15a communicates with the inside of the spent fuel storage facility 11 through the suction port 2, and is interposed between the second underground continuous wall 14b and the second building outdoor wall 12b and communicates with the atmosphere. The hollow space 15b is communicated with the inside of the spent fuel storage facility 11 through the exhaust port 3, so that the hollow space 15a serves as an air supply duct to feed air from the intake port 2 into the building, Can be used as an exhaust duct to discharge the air that has flowed out of the exhaust port 3 to the atmosphere.

That is, an underground spent fuel storage facility 1
The first underground continuous wall 14a and the second underground continuous wall 14b are constructed so as to be separated from the first underground wall 1 and the hollow spaces 15a and 15b formed therebetween are communicated with the atmosphere and the inside of the facility. Each space is an air supply duct,
It becomes an exhaust duct, and thus ventilation of the natural exhaust system is possible even though it is an underground spent fuel storage facility 11,
A ventilation structure excellent in power saving can be achieved without requiring large power unlike the forced exhaust system.

In the present embodiment, the first underground continuous wall 14a
And the second underground continuous wall 14b to the spent fuel storage facility 11
Although it is installed at the opposed position sandwiching the spent fuel storage facility 11, it is not always necessary to construct it at the opposed position. As long as a required amount of air flow by natural ventilation can be secured, the arrangement relationship between the two is arbitrary. For example, As shown in FIG. 3A, the first underground continuous wall 21a and the second underground continuous wall 21b may be constructed so as to be orthogonal to the plane, that is, the plane shape is L-shaped.

A hollow space 22a sandwiched between the first underground continuous wall 21a and the first outdoor building wall 24a, and a hollow space sandwiched between the second underground continuous wall 21b and the second external building wall 24b. A partition 23 is provided between them so that they do not communicate with each other.

Further, as shown in FIG. 3B, the first underground continuous wall 31a and the second underground continuous wall 31b may be constructed so as to be in a plane serial position.

As in the above-described modification, the hollow space 32a sandwiched between the first underground continuous wall 31a and the first outdoor building wall 34a, and the second underground continuous wall 31b and the second outdoor building wall 31b. A partition 33 is provided between the hollow space 32b sandwiched between the two so that the hollow space 32b does not communicate with each other.

[0026]

As described above, according to the ventilation structure for a spent fuel storage facility according to the first aspect of the present invention, the outdoor wall, the first underground continuous wall and the second underground continuous wall of the spent fuel storage facility are constructed. The hollow space formed between the underground continuous wall and the underground continuous wall acts as an air supply duct and an exhaust duct, respectively. As described above, a ventilation structure excellent in power saving can be provided without requiring large power.

[0027]

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a ventilation structure of a spent fuel storage facility according to the present embodiment.

FIG. 2 is a plan view seen from the direction of the line AA in FIG. 1;

FIG. 3 is a plan view showing a ventilation structure of a spent fuel storage facility according to a modification.

FIG. 4 is a cross-sectional view showing a ventilation structure of a spent fuel storage facility according to the related art.

[Explanation of symbols]

Reference Signs List 2 intake port 3 exhaust port 11 underground spent fuel storage facility 12a first building outdoor wall 12b second building outdoor wall 14a first underground continuous wall 14b second underground continuous wall 15a, 15b hollow space 24a first 1st building outdoor wall 24b 2nd building outdoor wall 21a 1st underground continuous wall 21b 2nd underground continuous wall 34a 1st building outdoor wall 34b 2nd building outdoor wall 31a 1st underground continuous wall 31b 2nd Underground diaphragm wall

Claims (1)

[Claims] 1. A suction port is provided below an outdoor wall of a first building.
A ventilated structure of a spent fuel storage facility having an exhaust port provided above each of the outside walls of the first building, wherein the first underground continuous wall is constructed while being separated from the first outside wall of the building.
A hollow space between the underground continuous wall and the first building outdoor wall and communicating with the atmosphere communicates with the inside of the spent fuel storage facility through the suction port, and the second building outdoor wall To form a second underground diaphragm wall at a distance from
A hollow space between the underground continuous wall and the second building outdoor wall and communicating with the atmosphere is communicated with the inside of the spent fuel storage facility through the exhaust port. Structure of spent fuel storage facility.