JPS6027395B2 - Reactor support structure cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a nuclear reactor support structure, and more particularly to a cooling device suitable for use in a lower support longitudinal pressure tube reactor support structure.

First, a conventional example of a cooling structure for a reactor support structure in a downwardly supported vertical pressure tube type nuclear reactor will be described with reference to FIG.

The reactor 1 is the vedestal 2' of the reactor support concrete 2.
The reactor lower space 3 is in the form of a deep bit covered with a lid.

Therefore, when air rises and overflows due to heat transfer from the primary system high-temperature equipment piping 4, the high-temperature air stays in the lower part of the reactor, and the concrete reaches a high temperature of 100 to 200 pm. To maintain the integrity of concrete, the temperature during normal operation is 65℃.
Although the supply air duct and exhaust duct 6 for air circulation are provided, in order to eliminate air stagnation in the narrow adjacent space 8 at the bottom of the reactor surrounded by the heat insulation section 7 etc., it is necessary to do the following: There was a problem in that the duct equipment was extremely complicated. In particular, when fuel exchange is performed from below, it is necessary to provide a large space in the lower part of the reactor for the fuel exchange machine 9 to run, and duct equipment is required to be simplified. An object of the present invention is to prevent high-temperature gas from stagnation in the lower part of a nuclear reactor.

A feature of the present invention is that the reactor support structure is provided with a communication passage that connects the annular space existing between the reactor support structure and the reactor to the lower space below the reactor.

The present invention will be explained below based on the drawings. FIGS. 2 and 3 show an embodiment in which the present invention is applied to a downwardly supported longitudinal pressure tube type reactor support structure. The reactor 1' supported by It includes an air duct 5, a heat insulating member 7, a narrow space 8 in the lower part of the reactor, a fuel exchanger 9, a sole plate 11, and the like.

Cold air is blown into the lower reactor space 3 from the air supply duct 5 through air discharge ports 10 and 10', and the reactor support concrete 2 can be cooled with the cold air.

The lower reactor space 3 and the lower reactor narrow space 8 are connected to each other, and the lower reactor narrow space 8 has sole plates 11 disposed in the radial direction between circumferentially adjacent sole plates 11. A nuclear reactor in which a plurality of ventilation pipes 12 are arranged, and is formed between the reactor lower narrow corner space 8, the biological shielding wall 14, and the reactor 1 through the passage of each ventilation pipe 12 serving as a through hole. The leg annulus space 13 is connected to the leg annulus space 13.

A plurality of exhaust pipes 15 are provided on the circumference between the upper inner surface of the biological shielding wall 14 and the reactor 1, and exhaust ducts 16 suitable for each exhaust pipe 15 are arranged on the upper surface of the biological shielding wall 14. , the exhaust duct 16 is connected to an air conditioning unit.

The reactor side annulus space 13 and the exhaust duct 16 communicate through the passages of the exhaust pipes 15, which are through holes. In the cooling device of the present invention configured as described above, cold air is supplied through the air supply duct 5, and the cold air is blown from the air discharge ports 10, 10' of the air supply duct 5 toward the lower part and side of the vedestal 2'. The reactor support concrete 2 is cooled by the cold air.

The air heated by cooling the reactor support concrete 2 passes through the ventilation pipe 12 provided between the sole plates 11 on the upper surface of the bedstone 2' and into the reactor side annulus space 1.
The air that flows into the reactor side annulus space 13 while cooling the biological shielding wall 14 passes through the exhaust pipe 15, enters the exhaust duct 16, and is sent to the air conditioning unit. That is, the heated air in the lower reactor space 3 flows smoothly into the lower reactor narrow space 8, the ventilation pipe 12, the reactor side annulus space 13, the exhaust pipe 15, and the exhaust duct 16 due to natural convection. , and returned to the air conditioning unit.

According to the embodiment, since the ventilation pipe 12 is provided between the sole plates 11, 11, the strength of the reactor support structure is hardly reduced, and the biological shielding wall 14 can also be cooled.

The present invention has the configuration and operation described above, and the overflowing air in the lower part of the reactor passes through the through hole provided in the reactor support structure and is caused by natural convection to pass through the reactor side or Since it can be moved to the upper space, it has the effect of completely preventing the problem of high temperature air staying in the lower part of the reactor and causing the reactor support structure to reach high temperatures, and also simplifies the cooling system for the reactor support structure. It has a potential effect.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a conventional cooling device for a nuclear reactor support structure, and FIG. 2 is a vertical cross-sectional view showing an embodiment in which the present invention is applied to a downwardly supported longitudinal pressure tube type reactor support structure. 3 is a cross-sectional view taken along the line A--A in FIG. 2. 1... Nuclear reactor, 2... Reactor support concrete, 2'... Same bed tower, 3... Nuclear reactor lower space, 5... Air supply duct , 8... Narrow space below the reactor, 12... Ventilation pipe, 13...
...Reactor side annulus space, 15...Exhaust pipe, 16...Exhaust duct. Kaya-zu Kaya 3-zu ticket 2

Claims (1)

[Claims] 1. In a cooling device for a reactor support structure that has a protrusion that supports the lower part of the reactor and surrounds the reactor, a lower space below the reactor within the reactor support structure. means for supplying cooling gas to the reactor; a communication passage provided in the reactor support structure that connects the annular space between the reactor and the reactor support structure and the lower space; 1. A cooling device for a nuclear reactor support structure, comprising an exhaust pipe communicating with an annular space.