JPS6394190A - Decay heat removing system of fast breeder reactor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a fast breeder reactor, and more particularly to a decay heat removal system for a fast breeder reactor that removes decay heat by natural ventilation of air.

(Prior Art) As a method for removing decay heat from a fast breeder reactor, a method using a natural air passage wall has been considered. Figure 2 shows such a decay heat removal system. A safety vessel (not shown) surrounding the reactor core (υ) is housed in the reactor room ■.

The outside of the safety vessel is surrounded by a shroud (■), the bottom of which has a vent opening into the reactor chamber, and the top of which communicates with the exhaust duct (■). Furthermore, an intake duct (2) having an air intake port 0 communicates with the reactor room. In a decay heat removal system having such a configuration, the air in the shroud is heated and heated by the decay heat from the core transmitted through the safety vessel, and is discharged to the outside by the chimney effect of the exhaust duct. In other words, air A generates natural ventilation along the route of air intake B0 → intake duct ■ → reactor room ■ → ventilation hole (A) → exhaust duct ■, and decay heat can be removed without power. In addition to reducing equipment costs due to the simplification of the decay heat removal system, it has features that increase inherent safety. On the other hand, however, in order to remove decay heat only by natural ventilation without power, it is necessary to increase the height of the exhaust duct to ensure a chimney effect, which would cool the safety container more than necessary during steady operation. It's over. The drawback was that heat that could originally be used as heat output was wasted outside.

(Problems to be Solved by the Invention) The present invention is intended to solve the above-mentioned drawbacks. During steady operation, the safety container is not cooled more than necessary, and the thermal energy that is discarded outside is recovered and used, and when the reactor is shut down, it collapses. The purpose of the present invention is to provide a decay heat removal system for a fast amplification reactor that can sufficiently remove heat.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides an air turbine inside the intake duct that connects the air intake and the reactor room, and further provides an intermittent power recovery system on the rotating shaft of the air turbine. This is a decay heat removal system for a fast amplification reactor that is characterized by:

(Function) In the above configuration, when the power recovery system is cut off when the reactor is shut down, the air turbine idles and ventilation resistance is reduced, so that decay heat can be sufficiently removed. On the other hand, if the power recovery system is used during steady operation, the power is recovered from the air turbine, which increases ventilation resistance, suppresses the amount of natural ventilation, and prevents the safety container from being cooled more than necessary. It exhibits the effect of recovering and utilizing heat energy that would otherwise be discarded to the outside.

(Example) An example of the present invention will be described below with reference to FIG. In this figure, the same components as those in FIG. 2 are designated by the same numbers and their explanations will be omitted.

The difference between FIG. 1 and FIG. 2 is that an air turbine power recovery system is provided between the air intake and the reactor chamber. This air turbine power recovery system uses the intake duct■
It consists of an air turbine (1) installed inside, an electromagnetic clutch (10), a transmission (11), and a power recovery machine (12) connected sequentially to this rotating shaft.

It is preferable that the electromagnetic clutch be energized only once and not energized.Firstly, the operation of the above embodiment will be explained. During steady operation, the electromagnetic clutch is energized, connecting the air turbine (1) and the power recovery machine, and recovering power from natural ventilation. At this time, since the power is recovered by the air turbine, the ventilation resistance in the intake duct increases, and the amount of natural ventilation is suppressed.

When the furnace is shut down, the electromagnetic clutch is de-energized and the air turbine and power recovery machine are disconnected, so the air turbine idles, resulting in a decrease in ventilation resistance in the intake duct and an increase in the amount of natural ventilation. In addition, in the above embodiment, the power recovery machine (12) may be a water pump, an air blower, a compressor for a refrigerator, etc. in addition to the generator, and the power recovery machine (12) may be a water pump, an air blower, a compressor for a refrigerator, etc.
) is not necessarily required.

〔Effect of the invention〕

According to the present invention, it is possible to realize a decay heat removal system that sufficiently removes decay heat when the reactor is shut down and does not cool the safety vessel more than necessary during steady operation.

During steady operation, the power obtained from the air turbine power recovery system is used to generate electricity, and can also be used to drive chiller compressors for reactor building air conditioning, water pumps or gas circulation blowers for cooling roof slabs, etc., reducing in-house power consumption. I can contribute. Furthermore, if a energized electromagnetic clutch is installed between the air turbine and the power recovery machine, for example, in the event of a power loss accident, the electromagnetic clutch will automatically disconnect and the air turbine will be separated from the power recovery machine, resulting in natural ventilation. It has the effect of increasing inherent safety because it automatically increases and removes decay heat.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional example. 1...Safety vessel, 2...Reactor room, 3...
Shroud, 4...Vent hole, 5...Exhaust duct, 6...Air intake port, 7...Intake duct, 1β-...Air turbine power recovery system 9...Air turbine, 10 ...W1 magnetic clutch 11...transmission, 12...power recovery machine. Agent Patent Attorney Nori Chika Kikuo Tama Takehana No. 1・°Fig. 2

Claims (1)

[Claims] A fast breeder reactor that cools the outside of the reactor by natural air ventilation to remove decay heat, and is characterized in that a power recovery system using an air turbine is installed between an air intake port and a reactor chamber. decay heat removal system.