JPS5833596Y2 - Fuel pool cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover for a fuel pool in a nuclear power plant that is attached to cover the surface of the fuel pool to suppress evaporation and diffusion of pool water.

For example, nuclear power plants have fuel pools that are made of concrete and lined with stainless steel plates on the inner surface of the pool body, and pure water is injected into these pools during normal operation or during reactor inspections, and is It is designed to prevent the spread of the virus to the outside.

Furthermore, spent nuclear fuel, control rods, etc. are stored in the fuel pool, and pure water is always stored not only during inspection but also during normal operation.

On the other hand, the floor above the fuel pool is ventilated by an attached air conditioner, and the indoor air is regulated so that the relative humidity is maintained at 50% to 60%.

Furthermore, the water in the fuel pool is constantly circulated and cooled by a cooling device.

On the other hand, the free surface of pure water in the fuel pool is approximately 120 m
Since the free surface is exposed to ventilation drafts, the air on the free surface moves and a significant amount of moisture evaporates from the surface of the pool water, which can cause air contamination to the upper floors. There was sex.

However, in the conventional fuel pool 1, as shown in FIG. Evaporated matter is sucked up by the suction port 2, preventing it from spreading to the upper floors.

However, in the above type of fuel pool, since the suction port 2 is formed on the pool wall, the suction efficiency is low in the central area of the pool 0 water surface, and the amount of suction ventilation is large, so the amount of water evaporation is also low. There is a problem in that the amount of water increases, and the supply of make-up water and the processing of evaporated water also increase.

The present invention was developed in view of the above points, and is a pool cover that covers the entire upper surface of the fuel pool to lower the radiation level on the work floor and minimize the amount of moisture evaporated by air conditioning. The purpose is to provide.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 10 denotes the rails of the fuel exchange platform installed on both sides of the upper surface of the fuel pool 1, and a plurality of frame members 11 slide on the rails 10, 10 so as to straddle the water surface. It is placed freely.

That is, as shown in FIG. 3, a roller 13 is attached to the lower end of the leg portion 12 of the frame member 11, and a guide roller is attached to clamp the rail 10 to prevent the frame member from detaching from the rail. 14 are provided.

On the other hand, among the frame members 11 placed on the rail 10, the adjacent frame members 11, 11 are connected in the longitudinal direction of the fuel pool 10 by means of a connecting rod 15 which is pivotally connected at the intermediate portion, as shown in FIG. They are connected at a partial pitch, for example, 1 m apart.

Then, the frame members 11゜11... are connected to each other by connecting rods 15. A sheet-like cover 16 is provided to cover the entire structure.
is permanently attached.

However, during normal operation, each frame member 11 is connected to the connecting rod 15.
The sheet-like cover 16 is placed at a position such that the fuel pool 1 remains in an extended state, that is, at intervals of 1 m, so that the sheet-like cover 16 covers the entire water surface of the fuel pool 1.

Next, when working in the fuel pool, by moving the framework 11 along the rails 10 only to the extent necessary for the work space, the water surface will be exposed in accordance with the amount of movement of the framework.

In the above embodiment, the sheet-like cover is fixedly attached to the frame material, but it goes without saying that the same effect can be obtained even if the sheet-like cover is made openable and closable like a curtain.

As described above, according to the present invention, since the fuel pool is covered with a cover, evaporated water does not directly diffuse into the air, and does not contaminate the air on the floor located above. Since ventilation does not directly hit the free surface of the pool water, the amount of water evaporation is reduced, the supply cycle of makeup water is lengthened, and falling dust and flying objects are not mixed into the pool water. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional fuel pool, Fig. 2 is an explanatory diagram of the installation state of the pool cover of the present invention, Fig. 3 is an enlarged view of the same main part, and Fig. 4 is an illustration of the pool cover of the present invention. FIG.

Claims (1)

[Scope of utility model registration request] A plurality of frame members movably installed on the top surface of the pool wall,
A cover for a fuel pool, characterized by having a connecting rod that connects adjacent frame members to each other, and a sheet-like cover attached to cover the frame members.