JP3091519B2 - Nuclear power plant turbine building ventilation and air conditioning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation and air conditioning system for a turbine building of a BWR nuclear power plant.

[0002]

2. Description of the Related Art FIG . 4 shows a conventional ventilation and air conditioning system for a nuclear power plant turbine building. In FIG. 4 , outside air is taken in by an air supply fan 7 through an outside air processing device (air supply filter) 9, and after cooling each room, the exhaust air of the turbine building 5 is processed by each exhaust processing device (exhaust filter) 11. followed common et sent to the main stack 1 at the exhaust fan 12 <br/> been, it is diffused released into the atmosphere.

[0003] Further, in the "ventilator for turbine building" described in Japanese Patent Application Laid-Open No. 61-105488, the turbine building is divided into two sections with a confidential operating floor, and the operating floor of the turbine building during normal operation. Ventilation and air conditioning system is designed to supply air from the air inlet on the wall of the turbine building operation floor and exhaust air from the rooftop ventilation fan.The radioactivity in the turbine building operation floor space increased during regular inspections or for some reason. At times, the rooftop ventilation fan is closed, and the large floor entrance of the operation floor is opened to connect the operation floor space to the space below the floor, and a spare exhaust fan is additionally operated to exhaust air.

[0004] Further, in the "nuclear power plant turbine building provided with ventilation equipment" described in Japanese Patent Publication No. 140316/1994, the ventilation air conditioning of the operating floor of the turbine building during normal operation is performed by confidentiality provided on the operating floor. With the lid closed, air is supplied from the air inlet on the wall of the turbine building operation floor and exhausted from the rooftop ventilation fan, while ventilation in the contaminated area including the condenser area below is provided in the contaminated area. Air is supplied from the intake duct, and the condenser section is brought to a negative pressure to guide air to the condenser section, and then discharged from the main exhaust stack to the atmosphere through an exhaust duct connected to an outdoor exhaust system. It is performed by the system called. Ventilation and air-conditioning on the turbine building operation floor when the reactor is shut down during regular inspections, etc. is performed by supplying air from the air supply port provided on the wall of the turbine building operation floor and airtightness provided on the floor of the turbine building operation floor. Open the air-tight lid (big equipment entrance) and send exhaust air to the contaminated area including the condenser area,
Further, a system is used in which the air is discharged from the main exhaust pipe to the atmosphere through an exhaust duct leading to the exhaust equipment.

[0005]

In THE INVENTION It is an object of the ventilating air conditioning equipment shown in FIG. 4, the normal exhaust turbine during operation the turbine building in the turbine area (contaminated area) 5A and operating floor 5 together primarily through the exhaust filter 11 chimney In order to lead to 1 , the pressure loss in the exhaust filter, exhaust duct, and main exhaust stack increases,
Large capacity air supply and exhaust fans are required. In addition, since the flow rate of the main exhaust pipe 1 is large, a large diameter exhaust pipe is required for the main exhaust pipe.
Supply duct 16 is required. Therefore, construction costs and operating costs increase. In addition, since the same exhaust system is used to treat highly polluted areas in the turbine building and low-polluted areas such as the turbine building operating floor, large amounts of used filters as low-radioactive waste are generated and the amount of radioactive waste is reduced. To increase. Further, in the ventilation and air conditioning system described in JP-A-61-105488 and JP-B-1-40316,
During normal operation, the rooftop ventilation fan exhausts the turbine building operating floor, which increases construction and operating costs.In addition, during regular inspections or when radioactivity on the turbine building operating floor rises, the turbine Since the airtight lid provided on the floor of the operating floor of the building is opened and the air is exhausted through the contaminated area inside the turbine building, there is a problem that the airflow balance in the contaminated area inside the turbine building is lost.

A first object of the present invention is to provide a ventilation and air conditioning system for a nuclear power plant turbine building which reduces the capacity of an exhaust system such as an exhaust fan, an exhaust duct or a main exhaust stack, thereby reducing construction costs and operation costs. That is.

A second object of the present invention is to provide a nuclear power plant turbine capable of reducing the capacity of the exhaust system without using ancillary equipment such as a rooftop ventilation fan or the like and without breaking air flow balance. It is to provide building ventilation air conditioning equipment.

[0008]

Nuclear power plant turbine building ventilation air conditioning equipment according to the present invention SUMMARY In order to achieve the above, the turbine building in the pollution-ku,
Area and turbine building operating floor
Nuclear power for evacuation air conditioning of the separated nuclear turbine building
For the main exhaust stack in the ventilation and air-conditioning equipment at the power plant turbine building
A first exhaust fan to be connected is provided;
Exhaust system connected to the indoor contamination area, having an air inlet provided on the outer wall of the turbine building operation floor and an outlet provided at a position higher than the air inlet of the outer wall, usually There <br/> row ventilation air conditioning of the turbine building operation floor by natural circulation ventilation the supply to the air supply from the air inlet to the exhaust from the exhaust port during operation, the first ventilating air conditioning means for closing the exhaust port during periodic inspection And a dedicated exhaust system for a turbine building operation floor provided with a second exhaust fan connected to the main exhaust stack, and supplies air from the air supply port at the time of regular inspection to supply only the turbine building operation floor.
Provide ventilation air conditioning of the turbine building operation floor by via the exhaust system to the exhaust from the main exhaust pipe, during normal operation
Comprises a second ventilation air-conditioning means for disabling the exhaust system . Further, the nuclear power plant turbine building replacement according to the present invention.
Air-conditioning equipment is used to form a contaminated area inside the turbine building.
Nuclear power separated into bin area and turbine building operating floor
Nuclear power plant turbine building for air-conditioning of turbine building
In a house ventilation air conditioner, the first exhaust connected to the main exhaust stack
An air fan is provided to connect to the contaminated area inside the turbine building.
The exhaust system that was continued and the outer wall of the turbine building operation floor
Higher than the provided air supply port and the air supply port of the outer wall portion
The exhaust port is located at
For natural circulation ventilation in which air is supplied from the air port and exhausted from the exhaust port
Ventilation and air conditioning of the operating floor of the turbine building
First ventilation air-conditioning means for closing the exhaust port,
Means for selectively communicating the bin building operating floor with the exhaust system
At the time of regular inspection, the turbine building operation floor is connected to the exhaust system.
Communicating with the air supply port and passing the air through the exhaust system.
The operating floor of the turbine building is exhausted from the main exhaust stack.
Ventilation air-conditioning and shut off the communication during normal operation
A second ventilation air conditioning unit.

[0009]

[Function] First, ventilation and air-conditioning of the turbine building operating floor is performed by natural circulation ventilation during normal operation in which almost no radioactivity is released from the operating floor of the turbine building but heat generation of the equipment is large.
By providing ventilation air conditioning means, the capacity of the exhaust system such as exhaust fan, exhaust duct or main exhaust pipe can be reduced,
In addition, ancillary equipment such as a rooftop ventilation fan becomes unnecessary, and construction costs and operation costs are reduced. In addition, the amount of low radioactive waste such as used filters can be reduced. In addition, by exhausting gas from the main exhaust stack through the exhaust system dedicated to the turbine building operation floor during regular inspections, the turbine building operation floor space and the turbine building contamination area space are shut off. Disruption of the air flow balance is prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

1 and 2 are views of a turbine building in a nuclear power plant according to one embodiment of the present invention. FIG. 1 shows a normal operation and FIG. 2 shows a regular inspection. The turbine building 5 is separated into a turbine area 5A forming a pollution area inside the turbine building and a turbine building operation floor 3.

As ventilation and air-conditioning equipment for the turbine building operation floor 3, the air supply port 2 and the exhaust port 4 each having a louver, the exhaust duct 6, the exhaust filter 8, the operation floor exhaust fan 10, and the exhaust system of the turbine building operation floor exhaust system are provided. A check valve 14 for preventing backflow is provided. Supply port 2 and exhaust port 4
Constitutes first ventilation air-conditioning means for performing ventilation air-conditioning of the turbine building operation floor by natural circulation ventilation during normal operation, and includes an exhaust duct 6, an exhaust filter 8, an operation floor exhaust fan 10,
In addition, the check valve 14 constitutes a second ventilation air-conditioning unit that performs ventilation air conditioning of the turbine building operation floor 3 by supplying air from the air supply port 2 and exhausting air from the main exhaust pipe 1 at the time of regular inspection.

Further, an air supply processing device 9, an air supply fan 7 , an exhaust filter 11, and an exhaust fan 12 are provided as ventilation and air conditioning equipment for the turbine area 5A.

The ventilation and air conditioning for the turbine area 5A is as follows.
At the time of normal operation and regular inspection, the air supply processing device 9 and the air supply fan 7
And exhaust from the main exhaust pipe 1 via the exhaust filter 11 and the exhaust fan 12.

The ventilation and air conditioning of the turbine building operation floor 3 is performed as follows. During normal operation, air supply to the turbine building operation floor 3 is introduced through an air supply port 2 provided in the outer wall portion, and exhaust gas is exhausted through an exhaust port 4 provided in the outer wall surface. In this case, the driving force of natural circulation ventilation is the temperature difference between the inside and outside of the building, and the ventilation power due to the temperature difference is as shown in the Air Conditioning and Sanitary Engineering Handbook Volume II,

[0016]

[Number 1] is given by _{P t = h (γ 0 -γ} i) ··· (1). However, here P _t: Ventilation force due to temperature difference [mmAq] h: height difference of the air supply port and the exhaust port [m] γ _0: Density of the building outside air _{^{[kg / m 3] γ i}} : the building It is the density of air [kg / m ³ ].

Since the turbine 13 is installed on the turbine building operating floor 3, a large amount of heat is generated during the operation of the plant, and the indoor air is heated. Therefore, natural circulation ventilation occurs due to the density difference of the air outside the building. In this case, as shown in the above-mentioned theoretical formula, the height difference between the intake port and the exhaust port, h, is set as low as possible, the exhaust port is set as high as possible, and h is increased. It is preferable to increase the ventilation.

At the time of regular inspection, when inspecting the turbine rotor and the like, the turbine casing 13 is opened, so that a small amount of radioactive material adhering to the inside of the casing and the turbine blades is scattered, and the vicinity and the air are discharged. May be contaminated. Therefore, it is necessary to avoid that radioactivity is released directly from the exhaust port 4 to the outside during the regular inspection period.
In the embodiment shown in FIG. 2, in this case, the exhaust port 4 is automatically or manually closed, and the operating floor exhaust fan 10 provided in the exhaust system dedicated to the turbine building operating floor is operated, whereby the turbine building operating floor is operated. The exhaust of 3 is provided to the exhaust duct 6,
The air is discharged from the main exhaust pipe 1 to the outside via the exhaust filter 8 and the operating floor exhaust fan 10. In the case where the radioactivity is emitted from the main stack 1 and the case where the radioactivity is emitted from the exhaust port 4,
In the case where the radioactivity is diffused differently until reaching the site boundary and the radioactivity release rate is the same, in the present embodiment in which the radiation is released from the main stack 1, the amount of exposure is 1 in comparison with the case where the radiation is released from the exhaust port 4. / 10.

A description will be given of a case where the radioactivity concentration on the driving floor during the operation increases with reference to FIG. In the event that the radioactivity concentration in the exhaust of the turbine building operation floor 3 rises for some reason during operation , the radiation monitor detects that, and an alarm is issued to the middle cab. With this alarm, the exhaust port 4
Is closed automatically or manually, and the driving floor exhaust fan 10 is closed.
Activate The air on the turbine building operation floor 1 is supplied from the air supply port 2 and exhausted from the main exhaust pipe 1 by the operation floor exhaust fan 10 via the exhaust filter 8.

In the above-described embodiment, the natural exhaust ventilation is used to directly discharge the exhaust of the turbine building operating floor 3 from the exhaust port 4 which has been discharged from the main exhaust pipe 1 during the normal operation. The displacement from the plant can be reduced by about 20% from about 600,000 m ³ / h of the current plant to 500,000 m ³ / h. As a result, the diameter of the main exhaust pipe 1 can be reduced to 90%, and both the air supply fan 7 and the exhaust fan 12 can be reduced to about 80%.
And the air supply duct on the turbine building operation floor is not required. Further, the processing capacity of the exhaust filter 11 installed in front of the exhaust fan 12 is about 80%.
%, The amount of used filters that are low radioactive waste is also reduced to 80%. Therefore, both construction cost and operation cost are greatly reduced.

Therefore, according to the present embodiment, the turbine building operation floor is naturally ventilated during normal operation, so that no additional equipment such as a rooftop ventilation fan is required, and the exhaust fan 12 and the exhaust duct on the turbine area 5A side are not required. Alternatively, the capacity of the exhaust system such as the main exhaust pipe 1 can be reduced, and the construction cost and operation cost can be reduced. Also, low-radioactive disposal of the exhaust filter 11 and the like is reduced. Further, when the heat generation of the equipment is small at the time of the regular inspection, the exhaust gas is exhausted to the outside from the main exhaust pipe 1 through the exhaust system dedicated to the operation floor of the turbine building. Reduction is possible. Moreover, since the exhaust of the operation floor 3 is not performed through the turbine area 5A, it is possible to prevent the air volume balance in the turbine area 5A from being lost. In addition, the amount of low radioactive waste such as used filters can be reduced.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 3 shows the time of regular inspection. As ventilation air-conditioning equipment for the turbine building operation floor 3, an air supply port 2 and an exhaust port 4 each having a louver, an exhaust duct 17 for joining exhaust gas from the turbine building operation floor to an exhaust system in the turbine area 5 </ b> A, and an exhaust duct. A valve 15 for opening and closing the valve 17 is provided. The air supply port 2 and the exhaust port 4 constitute first ventilation and air conditioning means for performing ventilation and air conditioning on the turbine building operation floor by natural circulation ventilation during normal operation, as in FIGS. 1 and 2,
The exhaust duct 17 and the valve 15 constitute second ventilation and air-conditioning means for supplying air from the air supply port 2 at the time of regular inspection and sharing the exhaust system between the contamination area inside the turbine building and the operating floor of the turbine building.
The ventilation and air conditioning equipment for the turbine area 5A is shown in FIG.
And FIG.

The ventilation and air conditioning of the turbine area 5A and the turbine building operation floor 5 during normal operation, and the ventilation and air conditioning of the turbine area 5A during regular inspection are the same as those in the above embodiment.

The ventilation air conditioning of the turbine building operation floor at the time of regular inspection is performed as follows. During regular inspections, most of the equipment that becomes a heat source such as condensers and feed water heaters is stopped during normal operation, so the need for heat removal is small. Therefore, at the time of regular inspection, the valve 15 provided in the exhaust duct 17 is opened,
The exhaust of the turbine building operation floor 3 is joined to the exhaust system of the ventilation and air conditioning equipment in the turbine area 5A.
Then, the air is discharged from the main exhaust pipe 1 via the exhaust fan 12. In this case, the capacity of the exhaust filter 11 and the exhaust fan 12 may be about the time of normal operation since the heat generation is small as described above. In this case, the air may be exhausted by using an airtight lid (a large equipment entrance) provided on the floor of the turbine building operation floor without using the exhaust duct 17 and the valve 15.

According to this embodiment, similar to the above embodiment,
By using natural ventilation for the turbine building operation floor during normal operation, there is no need for additional equipment such as a rooftop ventilation fan.
Construction costs and operating costs can be reduced.

[0026]

[0027]

[0028]

According to the present invention, the capacity of an exhaust system such as an exhaust fan, an exhaust duct or a main exhaust pipe is reduced, and ancillary equipment such as a rooftop ventilation fan is not required. Can be reduced. Also,
The amount of low radioactive waste such as used filters can be reduced. Further, since the exhaust is exhausted from the main exhaust pipe via the exhaust system dedicated to the operation floor of the turbine building at the time of regular inspection, it is possible to prevent the air volume balance from being lost. Therefore, it is possible to provide a ventilation / air-conditioning facility for a nuclear power plant turbine building which is excellent in economic efficiency and high in safety.

[Brief description of the drawings]

FIG. 1 is a diagram showing a ventilation and air conditioning system during a normal operation of a nuclear power plant turbine building according to an embodiment of the present invention.

FIG. 2 is a diagram showing ventilation and air conditioning equipment at the time of regular inspection of the nuclear power plant turbine building shown in FIG.

FIG. 3 is a diagram showing a ventilation air conditioning system at the time of regular inspection of a nuclear power plant turbine building according to another embodiment of the present invention.

FIG. 4 is a diagram showing ventilation and air conditioning equipment of a nuclear power plant turbine building according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main exhaust pipe 2 Air supply port 3 Turbine building operation floor 4 Exhaust port 5 Turbine building 5A Turbine area (contaminated area) 8 Exhaust filter 10 Operating floor exhaust fan 12 Exhaust fan

Claims (2)

(57) [Claims] 1. A turbine for forming a polluted area in a turbine building.
Nuclear power station separated into the operating area and the operating floor of the turbine building.
-Nuclear power plant turbine building for air-conditioning of bin building
A first exhaust fan connected to a main exhaust pipe is provided in the ventilation air conditioning equipment ;
Has an exhaust system connected to the turbine building the contaminated area, the turbine building operation floor of the outer wall air supply port provided and an exhaust port provided at a position higher than the air inlet of the outer wall portion , Provide ventilation air conditioning of the turbine building operation floor by natural circulation ventilation the supply to the air supply from the air inlet to the exhaust from the exhaust port during normal operation, to close the exhaust port during periodic inspection
A first ventilating air conditioning means that, the second exhaust fan connected to the main exhaust pipe is provided
Has a turbine building operation floor dedicated exhaust system, the supply air supply from air inlet to the turbine building operation floor dedicated exhaust system during periodic inspection
Provide ventilation air conditioning of the turbine building operation floor by the exhaust from the main exhaust stack via the exhaust during normal operation
And a second ventilation / air-conditioning unit that deactivates the air system. 2. A turbine for forming a polluted area in a turbine building.
Nuclear power station separated into the operating area and the operating floor of the turbine building.
-Nuclear power plant turbine building for air-conditioning of bin building
A first exhaust fan connected to a main exhaust pipe is provided in the ventilation air conditioning equipment ;
An exhaust system connected to the pollution area in the turbine building, and an air supply port and an air supply port provided on an outer wall portion of the turbine building operation floor.
And the outer wall portion is provided at a position higher than the air supply port.
It has an exhaust port and supplies air from the air supply port during normal operation.
Turbine building operation by natural circulation ventilation exhausted from the exhaust port
Carry out ventilation and air conditioning at the transfer floor, and close the exhaust port at regular inspections
First ventilation air conditioning means, and means for selectively communicating the turbine building operating floor to the exhaust system, and the turbine building operating floor is
It communicates with the exhaust system, supplies air from the air supply port, and passes through the exhaust system.
Exhaust from the main exhaust stack
Ventilation and air-conditioning of the operating floor of the house.
And a second ventilation and air-conditioning means for shutting off .