JPH02223896A - Cooling device for used fuel pool - Google Patents

Abstract

PURPOSE:To efficiently eliminate heat of a used fuel pool by providing a heat pipe in which the other end is led out by an up-grade to the outside of a nuclear reactor building, in the used fuel pool. CONSTITUTION:In the upper part of the inside of a nuclear reactor building 1, a used fuel pool 2 is formed. In this used fuel pool 2, used fuel 3 is installed. A heat pipe 5 which passes through a wall part 1a or a ceiling part 1b of the nuclear reactor building 1 is provided in a state that one end thereof is immersed into the fuel pool 2. In this case, heat generated by the used fuel 3 is transferred to pool water 2a in the used fuel pool 2. Subsequently, heat of this pool water 2a is transferred to a water immersing part 5a of the heat pipe 5, and heat is carried to the outside of the nuclear reactor building 1 through the inside of the heat pipe 5, and emitted to the open air through a heat radiating part 5b. In such a way, cooling of the used fuel pool 2 is executed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a spent fuel pool cooling device for cooling a spent fuel pool that stores spent fuel generated in a nuclear power plant.

(Prior Art) Hereinafter, the prior art of a spent fuel pool cooling system will be explained with reference to FIG.

In FIG. 3, spent fuel 3 is installed in a spent fuel pool 2 formed inside and above a reactor building 1. As shown in FIG. The heat generated from the spent fuel 3 is transferred to the pool water 2a of the spent fuel pool 2, and this pool water 2a flows into the skimmer surge tank 4, and passes through the spent fuel pool cooling and purification system pump 9. After being cooled in the fuel cooling purification system heat exchanger 10 and filtered and desalted in the filtration demineralizer 11,
It is reintroduced into the spent fuel pool 2. The heat exchanged in the spent fuel pool cooling and purification system heat exchanger 10 is transferred from the secondary system of the spent fuel pool cooling and purification system heat exchanger 10 to the auxiliary cooling system heat exchanger by the auxiliary cooling system pump 12. It is sent to a container 13 and cooled. The heat exchanged in the auxiliary cooling system heat exchanger 13 is transferred to seawater sent from the auxiliary cooling system seawater pump 14, and is finally released into the sea.

(Problem to be solved by the invention) As mentioned above, in order to dump the heat generated in the spent fuel pool into the sea, three types of pumps, two types of heat exchangers, and three piping systems are required, although they are not shown in Figure 3. In addition, valves, instrumentation, control, and power supply equipment are required.In this way, conventional equipment required a large amount of electrical and mechanical equipment to fulfill its functions.

An object of the present invention is to provide a spent fuel pool cooling system 1q that can cool a spent fuel pool with simple equipment and improve the reliability of the cooling capacity.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a spent fuel pool cooling system for cooling a spent fuel pool installed in a reactor building. To provide a spent fuel pool cooling device characterized in that a heat pipe is disposed with the other end going up outside the reactor building and led out by a heat pipe.

(Function) In the spent fuel pool cooling system configured in this way, the heat in the fuel pool is transferred to the high-temperature parts of the pipes from P1 to the outside air outside the building, which is the low-temperature part, through the heat pipes. This action prevents the spent fuel pool from cooling.

(Example) Hereinafter, an example of the present invention will be described with reference to FIG. In FIG. 1, a spent fuel pool 2 is formed inside and above a reactor building 1. Spent fuel 3 is installed in this spent fuel pool 2 . A heat pipe 5 is provided penetrating through the wall 1a or ceiling 1b of the reactor building 1, with one end immersed in the fuel pool 2.

With the above configuration, the heat generated in the spent fuel 3 is transferred to the pool water 2a in the spent fuel pool 2. The heat of this pool water 2a is transferred to the water-immersed part 5a of the heat pipe 5.
The heat is transferred to the outside of the reactor building 1 through the heat pipe 5, and is emitted to the outside air through the heat radiation part 5b. As described above, the spent fuel pool 2 is cooled.

In addition, in order to enhance the cooling effect as necessary, the following configuration may be adopted. Cooling fins 6 are provided at both ends of the above-mentioned P1-pipe 5. With this cooling fin 6,
The heat transfer area for transmitting heat in the high temperature section 5a and the heat transfer area for dissipating heat in the low temperature section 5b are increased, making it possible to remove a larger amount of heat with a smaller number of heat pipes 5.

Still another embodiment will be described with reference to FIG.

In FIG. 2, the cold and hot part 5b of the heat pipe 5 is
An exhaust pipe 7a formed on the wall 1a or the ceiling 1b.

Install it in 7b. Therefore, due to the chimney effect, the exhaust pipe 7
More air flows in through the air intake ports 8 of a and 7b (indicated by arrows in the figure), increasing the heat transfer coefficient of the low-temperature section 5b of the heat pipe, and efficiently discharging the spent fuel with a smaller number of P1-pipes. Heat can be removed from the pool.

(Effects of the Invention) According to the spent fuel pool cooling device according to an embodiment of the present invention, the spent fuel pool can be cooled using a simple static device called a heat pipe without using external power or dynamic devices. The spent fuel pool can be cooled with high reliability.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a spent fuel pool cooling system showing one embodiment of the present invention, Fig. 2 is a system diagram of a spent fuel pool cooling IA system showing another embodiment of the invention, and Fig. 3 is a system diagram of a spent fuel pool cooling system showing another embodiment of the present invention. 1 is a system diagram showing a conventional example of a spent fuel pool cooling device. 1... Reactor building 2... Spent fuel pool 5
... Pipe to heat 1 6 ... Cooling fin agent
Patent Attorney Noriyuki Chika Yudo Ken Daishimaru

Claims (1)

[Claims] In the spent fuel pool cooling system that cools the spent fuel pool installed in the reactor building, a heat pipe is placed inside the spent fuel pool, the other end of which goes up outside the reactor building and is led out by a pipe. A spent fuel pool cooling device comprising: