JPH0428080Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to nuclear power plants.

(Prior Art) A conventional nuclear power plant is shown in Figures 2 and 3.
First, to explain the nuclear power plant shown in Figure 2, 11
is a bedrock, 12 is a hole drilled in the same bedrock 11, 13
14 is a thick concrete layer cast around the pit 12, 14 is a pit formed inside the concrete layer 14, and 16 is the concrete layer 14.
A seat (vedestal) placed on the upper end surface, 23 a lid (roof slab) supported by the seat 16, 1
Reference numeral 5 indicates a reactor vessel installed vertically from the lid 23 into the reactor vessel 14, 18 refers to a coolant circulation pump installed vertically into the reactor vessel 23 from the cover 23, and 19 connects the reactor vessel from the cover 23 to the reactor vessel. 23 is an intermediate heat exchanger vertically installed in the reactor vessel 23; 20 is an upper reactor mechanism (an upper reactor mechanism having a control rod drive device, a fuel handling device, etc.) attached to the lid 23; 21 is an upper reactor mechanism installed in the reactor vessel 23; The core structure 22 is a partition plate that forms a circulation flow path for the primary coolant in the reactor vessel 23, and the primary coolant flows from the coolant circulation pump 18 to the intermediate heat exchanger 19 to the core structure 21. →Coolant circulation pump 18
The primary coolant is circulated through the intermediate heat exchanger 19.
When passing through the intermediate heat exchanger 19, the secondary coolant flowing through the intermediate heat exchanger 19 is heated. Further, the control rod drive device of the reactor upper mechanism 20 controls the amount of insertion of the control rods into the reactor core 21, thereby controlling the thermal output of the reactor core 21.

Next, to explain the nuclear power plant in Figure 3, 1
Reference numerals 1 to 20 are the same parts as in the nuclear power plant shown in FIG. The nuclear power plant operates in the same way as the nuclear power plant shown in FIG. 2 above.

(Problems to be solved by the invention) In the nuclear power plant shown in Figures 2 and 3 above,
A thick concrete layer 13 around the pit 12
A bedestal 16 is placed on the upper end surface of the concrete layer 13, a roof slab 17 is supported by the bedestal 16, and the reactor vessel 15 is poured from the lid 23 into the pit 14. is installed vertically to reduce the input to the reactor vessel 15 in the event of an earthquake, which requires a thick concrete layer 13, which raises the problem of increased equipment costs.

(Means for Solving the Problems) The present invention addresses the above-mentioned problems, and includes a covering material that covers the inner surface of a pit bored in the rock, and a covering material that is placed on the rock around the pit. a base mat, a roof slab supported by the base mat, a reactor vessel vertically mounted on the roof slab,
The present invention relates to a nuclear power plant characterized by having a building built on the base mat, and its purpose is to provide an improved nuclear power plant that can reduce equipment costs.

(Function) In the nuclear power plant of the present invention, the inner surface of the shaft drilled in the bedrock is covered with a covering material, a base mat is laid on the bedrock around the shaft, and the roof slab is covered with the base mat. Since the reactor vessel 1 is vertically supported on the roof slab and the building is built on the base mat, the thick concrete layer required in conventional nuclear reactor plants is no longer required, and the equipment Costs are reduced.

(Example) Next, the nuclear power plant of the present invention will be explained using an example shown in FIG. 2 is a base mat laid on the bedrock 1 around the shaft 1a, 6 is a roof slab supported by the base mat 2, and 4 is a safety container (containment container) suspended from the roof slab 6. ,
5 is the reactor vessel vertically installed on the same roof slab 6, 8
This is the building built on the base mat 2 mentioned above.

The roof slab 6 includes the reactor vessel 15.
There is a coolant circulation pump installed vertically inside the reactor vessel 5, an intermediate heat exchanger installed vertically inside the reactor vessel 5, and an upper reactor mechanism (an upper reactor mechanism including a control rod drive device, a fuel handling device, etc.). . In addition, inside the reactor vessel 5,
There is a reactor core structure, and the primary coolant is circulated from the coolant circulation pump to the intermediate heat exchanger to the core structure to the coolant circulation pump, and the primary coolant passes through the intermediate heat exchanger. Sometimes, the secondary coolant flowing through the intermediate heat exchanger is heated. Further, the control rod drive device of the reactor upper mechanism controls the amount of insertion of the control rods into the reactor core, thereby controlling the thermal output of the reactor core.

(Effects of the Invention) The nuclear power plant of the invention is constructed in a rock bed as described above.
The inner surface of the vertical hole 1a drilled in the vertical hole 1a is covered with a covering material 7, a base mat 2 is laid on the rock bed 1 around the vertical hole 1a, a roof slab 6 is supported by the base mat 2, a reactor vessel 5 is vertically installed on the roof slab 6, and a building 8 is built on the base mat 2.
This eliminates the need for the thick concrete layer that was required in conventional nuclear reactor plants, resulting in reduced equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing an embodiment of a nuclear power plant according to the present invention, Fig. 2 is a longitudinal side view showing a conventional nuclear power plant, and Fig. 3 is a longitudinal side view showing another conventional example of a nuclear power plant. It is. 1... Bedrock, 1a... Pit, 2... Base pine, 5... Reactor vessel, 6... Roof slab, 7
...Covering material, 8...Building.

Claims (1)

[Scope of utility model registration request] A covering material covering the inner surface of a shaft drilled into the bedrock, a base pine placed on the bedrock around the shaft, a roof slab supported by the base pine, and a nuclear reactor installed vertically on the roof slab. A nuclear power plant comprising a container and a building built on the base pine.