JP2007046909A - Ventilating air-conditioning equipment for nuclear power station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide ventilating air-conditioning equipment for a nuclear power station capable of surely and effectively inhibiting inflow of leaking vapor into an electric component chamber, protecting an electric component to avoid its damage and maintaining the function of the component. <P>SOLUTION: The ventilating air-conditioning equipment of a nuclear power station comprises: a ventilating air-conditioning duct 16 provided within a building 10 of the nuclear power station; a vapor leakage sensor 21 provided in the building 10 for sensing vapor; the electric component chamber 12 provided with the ventilating air-conditioning duct 16 and storing the electric component; and an automatic isolation means 20 provided in the ventilating air-conditioning duct 16 and closed upon a vapor sense signal from the vapor leakage sensor 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ventilation air conditioning facility for a nuclear power plant that performs ventilation and air conditioning of an electrical component room that houses important electrical components such as a power panel and a control panel, and maintains a safety function of the nuclear power plant.

  In the nuclear power plant, an electrical component room for storing important electrical components such as a power panel and a control panel is provided in the reactor building and the turbine building. The electrical component room is provided with a ventilation air conditioning duct such as an air supply duct or an exhaust duct, and air conditioning such as ventilation or air conditioning is performed by the ventilation air conditioning duct. The ventilation and air conditioning ducts maintain the temperature and humidity environment of the electrical room and maintain the safety functions of the nuclear power plant.

  When high-temperature and high-pressure steam leaks in a nuclear power plant due to damage to steam piping and fills the building, the leaked steam may flow into each room in the building through the duct of the ventilation air conditioning equipment.

  The conventional ventilating and air-conditioning facility of a nuclear power plant is configured as shown in FIG. 3, and an electrical component room 2 that houses important electrical components 1 such as a power panel and a control panel is provided in a turbine building 3 of the nuclear power plant. Be placed. In the electrical component room 2, an air supply duct 4 and an exhaust duct 5 are disposed in order to maintain the temperature and humidity environment of the room. The supply and exhaust ducts 4 and 5 provide ventilation and electrical ventilation in the electrical component room 2. Air conditioning for air conditioning is being carried out.

  The electrical equipment 1 of the nuclear power plant maintains a temperature and humidity environment at a required temperature and humidity throughout the year by air conditioning by the supply air and the exhaust ducts 4 and 5.

  Further, the air supply duct 4 and the exhaust duct 5 disposed in the electrical component room 2 also perform ventilation and cooling / heating of the respective rooms 6 in the turbine building 3 and are disposed in the entire area of the turbine building 3.

  In the ventilation air conditioning system of a nuclear power plant, an air supply duct 4 and an exhaust duct 5 arranged in the electrical component room 2 are arranged in the entire area of the turbine building 3 in order to perform ventilation and cooling / heating in the turbine building 3. The The air supply duct 4 and the exhaust duct 5 may be disposed in the vicinity of the high temperature / high pressure steam pipe 7 in the turbine building 3.

  If for some reason high-temperature / high-pressure steam leaks from the steam pipe 7 and fills the turbine building 3, the leaked steam may flow into the electrical component room 2 through the air supply duct 4 and the exhaust duct 5.

  When high-temperature and high-pressure steam flows into the electrical component chamber 2 as shown by the arrows in FIG. 3, the electrical component chamber 2 is also filled with high-temperature and high-pressure steam, and the electrical component cannot be sufficiently protected. There is a risk of causing an operation error of the electrical product or causing an operation failure to damage the electrical product 1.

  The present invention has been made in consideration of the above-described circumstances, and can reliably and effectively prevent the leakage steam from flowing into the electrical component room, protect the electrical component and prevent its damage, It aims at providing the ventilation air-conditioning equipment of a nuclear power plant which can aim at maintaining the function of electrical goods.

  In order to solve the above-described problems, a ventilation air-conditioning facility for a nuclear power plant according to the present invention includes a ventilation air-conditioning duct provided in a building of the nuclear power plant, and a ventilation air-conditioning duct provided in the building. The steam detection sensor for detecting steam, the ventilation air conditioning duct is disposed, the electrical component room for storing electrical products, and the ventilation air conditioning duct are provided and are closed by a steam detection signal from the steam detection sensor. Automatic isolation means.

  According to this nuclear power plant ventilation air conditioning system, it is possible to prevent leaked steam from flowing into the electrical equipment room in advance and reliably, protect the electrical equipment and effectively prevent its damage, and operate the electrical equipment. It is possible to improve reliability by preventing defects and malfunctions.

  An embodiment of a ventilation air conditioning facility for a nuclear power plant according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 shows a turbine building 10 of a nuclear power plant to which the present invention is applied, and a piping chamber 11 and an electrical component chamber 12 are defined in the turbine building 10. The piping chamber 11 is provided with steam piping 14 for guiding steam for driving the steam turbine, while the electrical component chamber 12 stores and installs important electrical components 15 such as a power supply panel and a control panel. The

  Further, the piping room 11 and the electrical component room 12 are provided with a ventilation air-conditioning equipment 19 including a ventilation air-conditioning duct 16 including an air supply duct 17 and an exhaust duct 18. Air conditioning such as ventilation and air conditioning of the article room 12 is performed. By this air conditioning, the temperature and humidity environment of the electrical component room 13 is adjusted so that the temperature is 10 ° C. to 40 ° C., for example, 20 ° C., and 30% to 90%, for example, 60%. The electrical component room 12 is adjusted and maintained at a temperature of 10 ° C. or higher and a humidity of 30% or higher even in winter.

  An air supply duct 17 and an exhaust duct 18 provided in the electrical component room 12 are also provided in the turbine building 10 as a ventilation air conditioning duct 16, and ventilation and cooling / heating in the turbine building 10 are performed. An air supply duct 17 and an exhaust duct 18 are arranged in the entire area of the turbine building 11.

  In some cases, an air supply duct 17 and an exhaust duct 18 are also provided in the vicinity of a steam pipe 14 such as a main steam pipe piped in the pipe chamber 11 of the turbine building 10.

  The air supply duct 17 and the exhaust duct 18 extending from the piping chamber 11 to the electrical component room 12 of the turbine building 10 are each provided with an automatic isolation damper 20 as an automatic isolation means. The automatic isolation damper 20 is a normally open damper and functions as an automatic closing damper, and is connected to the vapor leak detection sensor 21. By closing the automatic isolation damper 20, the electrical component room 12 is isolated from the peripheral region such as the piping chamber 11, and the electrical component chamber 12 can be made independent of the surrounding piping chamber 11.

  Steam leak detection sensors 21 are installed at various locations in the piping chamber 11 of the turbine building 10, detect steam leak from the steam pipe 14, and output a steam leak detection signal to the automatic isolation damper 20 as an automatic closing signal. The isolation damper 20 is automatically closed and the air supply duct 17 and the exhaust duct 18 are closed. The electrical component chamber 12 is isolated from the piping chamber 11 by closing the air supply duct 17 and the exhaust duct 18.

  By the way, the steam leak detection sensor 21 includes smoke detectors 23 of disaster prevention facilities installed in various places in the turbine building 10. The smoke detector 23 may be an existing smoke detector, and when the smoke detector is activated, a damper closing signal is output, and the automatic isolation damper 20 is closed. By closing the damper, the electrical component chamber 12 is isolated from the piping chamber 11 and the like in the turbine building 10 and the leakage steam is prevented from flowing in. The present inventors have found that the smoke detector can not only detect smoke but also accurately and accurately detect vapor leakage.

  Next, the operation of the ventilation air-conditioning equipment of the nuclear power plant according to the present invention will be described.

  At normal times, the automatic isolation damper 20 provided in the air supply duct 17 and the exhaust duct 18 is opened, and is indicated by an arrow A from each air supply port 17a of the air supply duct 17 into the electrical component chamber 12 and the piping chamber 11. On the other hand, air is exhausted to the outside of the turbine building 10 through the exhaust ports 18a of the exhaust duct 18 as indicated by an arrow B, and air conditioning of the electrical component room 12 and the piping room 11 is performed for air conditioning. It is.

  Further, when high-temperature / high-pressure steam leaks from the steam pipe 14 of the turbine building 10 for some reason and the piping chamber 11 of the turbine building 10 is filled with leaked steam, this steam leak is detected as a smoke detector as the steam leak detection sensor 20. 23 detects. The smoke detector 23 detects a steam leak, outputs a leaked steam detection signal to the automatic isolation damper 20, and automatically closes the isolation damper 20.

  By closing the automatic isolation damper 20, the electrical component chamber 12 is isolated from the surrounding piping chamber 11, and high-temperature and high-pressure steam is supplied from the piping chamber 11 to the electrical component chamber 12 through the air supply duct 17 and the exhaust duct 18. As shown by an arrow C in FIG. 2, it is possible to reliably prevent the inflow.

  In this embodiment, even if high-temperature and high-pressure steam leaks from the steam pipe 14 for some reason and the inside of the piping chamber 11 of the turbine building 10 is filled with leaked steam, the leaked steam is supplied to the air supply duct 17 and the exhaust duct 18. Inflowing into the electrical component room 12 through can be surely prevented in advance. For this reason, it is possible to reliably prevent the inside of the electrical component chamber 12 from becoming abnormally high temperature and high pressure due to leaked steam, so that the electrical component 15 can be protected and effectively prevented from being damaged. The operation can be effectively prevented, and the reliability can be improved.

[First Modification]
In the embodiment of the present invention, the example in which the smoke detector 23 is provided as the leaked vapor detection sensor 20 has been described. However, in the first modification, the vapor detection sensor is used instead of the smoke detector 23 or together with the smoke detector 23. 24 is provided as shown in FIGS. The steam detection sensor 24 is provided in each of the air supply duct 17 and the exhaust duct 18.

  The steam detection sensor 24 is installed outside the electrical component chamber 12 from the automatic isolation damper 20 provided in the air supply duct 17 and the exhaust duct 18.

  A steam detection sensor 24 is provided in each of the air supply duct 17 and the exhaust duct 18, and the steam detection sensor 24 causes steam to leak from the steam pipe 14 into the piping chamber 11 in the turbine building 10 for some reason, and this leaked steam flows into the piping chamber. 11, even when the pipe 11 is full, the steam detection sensor 24 detects the leaked steam in the piping chamber 11 and closes the automatic isolation damper 20. Can be reliably prevented from flowing in. That is, the electrical component chamber 12 can be isolated from the piping chamber 11 and the like.

  In the first modification, even if high-temperature and high-pressure steam leaks from the steam pipe 14 for some reason and fills the piping chamber 11 of the turbine building 10, the steam detection sensor 24 detects the leaked steam, and the automatic isolation damper 20 is installed. Since it is closed, it is possible to reliably prevent high-temperature and high-pressure steam from flowing into the electrical component chamber 12 through the air supply duct 17 and the exhaust duct 18. Therefore, the electrical product 15 housed in the electrical product room 12 can be protected and prevented from being damaged, and the function of the electrical product 15 can be maintained.

[Second Modification]
In the second modification, at least one of the pressure sensor 25, the temperature sensor 26, and the humidity sensor 27 may be provided instead of the smoke detector 23 or together with the smoke detector 23.

  The pressure sensor 25, the temperature sensor 26, or the humidity sensor 27 is provided in the piping chamber 11 of the turbine building 10. Specifically, the pressure sensor 25 is provided outside the automatic isolation damper 20 in the air supply duct 17 and the exhaust duct 18 leading from the piping chamber 11 to the electrical component chamber 12, while the temperature sensor 26 or the humidity sensor 27 is connected to the piping. It is provided at a required position in the chamber 11. As the temperature sensor 26 and the humidity sensor 27, existing sensors installed in various places in each turbine building 10 may be used.

  In the second modification, as shown in FIGS. 1 and 2, high-temperature and high-pressure steam leaks from the steam pipe 14 into the piping chamber 11 of the turbine building 10 for some reason, and the inside of the piping chamber 11 is filled with leaked steam. In this case, the high-temperature and high-pressure leaking vapor is detected by the pressure sensor 25, the temperature sensor 26 or the humidity sensor 27, and a vapor leakage detection signal is sent to the automatic isolation damper 20, and the automatic isolation damper 20 is automatically closed.

  By closing the automatic isolation damper 20, it is possible to reliably prevent high-temperature and high-pressure steam from flowing into the electrical component chamber 12 through the air supply duct 17 and the exhaust duct 18 as shown by the arrow C in FIG.

  According to the second modification, even if high-temperature and high-pressure steam leaks from the steam pipe 14 for some reason, and the leaked steam fills the piping chamber 11 of the turbine building 10, the leaked steam is supplied to the air supply duct 17 or Inflow into the electrical component room 12 through the exhaust duct 18 can be prevented without fail. Therefore, the electrical product 15 accommodated in the electrical product room 12 can be protected and prevented from being damaged, and the function of the electrical product 15 can be maintained, so that the reliability can be improved.

[Third Modification]
In the third modification, at least one of the image monitoring sensor 28 and the sound sensor 29 is provided in place of the smoke detector 23 or together with the smoke detector 23.

  The image monitoring sensor 28 and the sound sensor 29 may be existing image monitoring sensors 28 and sound sensors 29 installed at various locations in the turbine building 10. The image monitoring sensor 28 is a CCD sensor or a CMOS sensor, for example.

  In the third modification, by providing the image monitoring sensor 28 and the sound sensor 29 in the piping chamber 11 of the turbine building 10, high-temperature and high-pressure steam leaks from the steam piping 14 for some reason, and the piping chamber 11 of the turbine building 10. When the inside is filled with leaked steam, the image monitoring sensor 28 or the sound sensor 29 detects the steam leak and sends a detection signal to the automatic isolation damper 20 to automatically close the isolation damper 20.

  By automatically closing the automatic isolation damper 20, as shown by an arrow C in FIG. 2, leakage steam can be prevented from flowing into the electrical component chamber 12 through the air supply duct 17 and the exhaust duct 18 in advance.

  Therefore, the important electrical product 15 housed in the electrical product room 12 can be protected and effectively prevented from being damaged, and the function of the electrical product 15 can be maintained, so that the reliability can be improved.

[Fourth Modification]
In the first embodiment of the present invention, the example in which the smoke detector 23 is provided as the vapor leak detection sensor has been described. However, in addition to the smoke detector 23, the pressure sensor 25, the temperature sensor 26, the humidity sensor 27, and the image monitoring sensor. 28 and a sound sensor 29, and when any two or more of the sensors detect a steam leak from the steam pipe 14, a steam leak detection signal is output to the automatic isolating damper 20 to automatically activate the isolating damper 20. May be closed.

  In this case, if for some reason high-temperature and high-pressure steam leaks from the steam pipe 14 and the inside of the piping chamber 11 of the turbine building 10 is filled with leaked steam, the smoke detector 23, the steam detection sensor 24, the pressure sensor 25, Two or more sensors, the temperature sensor 26, the humidity sensor 27, the image monitoring sensor 28 and the sound sensor 29, detect the leakage of steam and close the automatic isolation damper 20, so that the leaked steam flows into the electrical component chamber 12. Can be surely prevented.

  In the fourth modification, it is possible to prevent the automatic isolation damper 20 from being closed due to malfunction of the sensors 24 to 29. Even if high-temperature and high-pressure steam fills the piping chamber 11 of the turbine building 10 for some reason from the steam pipe 14, this leakage is detected by two or more sensors and the automatic isolation damper 20 is closed. The operation of the damper 20 is highly reliable, and the leaked steam can be reliably prevented from flowing into the electrical component chamber 12.

  Therefore, it is possible to effectively prevent damage to the important electrical product 15 housed in the electrical product room 12, maintain the function of the electrical product, and improve reliability.

  In the embodiment and each modification of the present invention, a case where high-temperature and high-pressure steam leaks into the piping chamber 11 of the turbine building has been described. Target the area where it occurs.

  Also in the reactor building, except for the pressure boundary in the reactor containment vessel, a ventilation air conditioning system 19 including an air supply duct and an exhaust duct is disposed in the piping room and the electrical component room, like the turbine building.

The simple lineblock diagram showing the embodiment of the ventilation air-conditioning equipment of the nuclear power station concerning the present invention. The block diagram which shows embodiment of the ventilation air-conditioning equipment of the nuclear power station which concerns on this invention, and a vapor | steam leakage generate | occur | produces in a piping chamber. The block diagram which shows the ventilation air conditioning equipment of the conventional nuclear power plant.

Explanation of symbols

10 Turbine building (reactor building)
11 Piping room 12 Electrical goods room 14 Steam piping 15 Electrical goods (power supply panel, control panel)
16 Ventilation air conditioning duct 17 Supply air duct 18 Exhaust duct 19 Ventilation air conditioning equipment 20 Automatic isolation damper (automatic isolation means)
21 Steam leak detection sensor 23 Smoke detector (smoke detector)
25 Pressure sensor 26 Temperature sensor 27 Humidity sensor 28 Image monitoring sensor 29 Sound sensor

Claims (4)

A ventilation air-conditioning duct installed in the building of the nuclear power plant;
A steam detection sensor installed in the building for detecting steam;
An electrical component room in which the ventilation air-conditioning duct is disposed and stores electrical components;
Automatic isolation means provided in the ventilation air conditioning duct and closed by a steam detection signal from the steam detection sensor;
Ventilation air-conditioning equipment for nuclear power plants. 2. The ventilation air conditioning equipment for a nuclear power plant according to claim 1, wherein the steam detection sensor is provided in the ventilation air conditioning duct, and the automatic isolating means is provided closer to the electrical component room than the steam detection sensor. The ventilation air conditioning equipment for a nuclear power plant according to claim 1, wherein the steam detection sensor comprises at least one of a smoke detector, a pressure sensor, a temperature sensor, a humidity sensor, an image monitoring sensor, and a sound sensor. The vapor detection sensor includes at least two of a smoke detector, a pressure sensor, a temperature sensor, a humidity sensor, an image monitoring sensor, and a sound sensor, and the automatic isolation means is closed by a vapor detection signal from at least two sensors. The ventilation air conditioning system for a nuclear power plant according to claim 1.

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