JP2016008752A - Air conditioning system for emergency - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system in a temporary evacuation facility which can prevent radioactive substances of different characteristics from flowing into the temporary evacuation facility by performing switching between air conditioning equipment used at normal time and air conditioning equipment used at emergency time instantaneously, while saving time and effort for installing an air conditioner for emergency at an outside air intake port of the temporary evacuation facility in an emergency.SOLUTION: By interlocking a monitoring post 11 and air conditioning equipment in a temporary evacuation facility 1 in an emergency, when a radioactive rare gas which is hard to collect approaches the facility, the facility is closed in an air-tight manner. Then, after confirming that the radioactive rare gas has gone far from the facility, the outside air is taken into the facility via an air conditioner 5 for emergency. In addition, in order to maintain a positive pressure state inside the facility, a differential pressure inside and outside of the facility is automatically detected, and an outside air introduction air amount into the facility is automatically adjusted.

Description

The Nuclear Disaster Countermeasure Special Measures Law provides for the requirements for the establishment of an emergency emergency response base facility (offsite center) near the nuclear power plant as a nuclear disaster prevention measure, and for the situation where the emergency emergency response base facility cannot be used. Requirements regarding the establishment of alternative off-site centers are established.

In addition, in the event of an emergency, a temporary evacuation facility with radiation protection function may be provided near the nuclear power plant, assuming evacuation destinations for people in need of relief and residents in the surrounding area. The present invention proposes an air conditioning system for preventing air contaminated with radioactive material from flowing into a temporary evacuation facility in an emergency.

Temporary evacuation facilities in the event of a nuclear disaster are usually circulated indoors through air-conditioning equipment, or air is supplied from the outside and exhausted to the outside. In an emergency, air polluted by radioactive materials is used. It is necessary to operate an air conditioner with a built-in air filter that can collect radioactive materials, such as HEPA filters and activated carbon filters, to supply air to the facility.

If air is continuously vented to the air filter, atmospheric dust and the like will adhere to the filter medium surface, causing the filter medium to become clogged. In general, it is used separately from the one to be used and the one to be used in an emergency. In an emergency, an emergency air conditioner with a built-in air filter that can collect radioactive substances such as HEPA filters and activated carbon filters is installed in a temporary evacuation facility so that atmospheric dust attached to radioactive substances does not flow into the facility. It is necessary to keep the inside of the facility in a positive pressure state in order to take in outside air into the facility by connecting to the outside air intake and to prevent inflow of outside air from other than the outside air intake.

If the air conditioner that is normally used in an emergency is not normally classified, the air filter built in the emergency air conditioner may be clogged or activated carbon filter. In the event of an emergency, air contaminated with radioactive materials will flow into the temporary evacuation facility or cause clogging, reducing the supply air volume and maintaining the positive pressure inside the room. There is no fear.

For this reason, emergency air conditioners are not normally ventilated to prevent atmospheric dust, moisture and gas components in the atmosphere from adhering to the built-in HEPA filter and activated carbon filter. It will be connected to the intake.

Patent Document 1 describes a radioactive gas removal device including a radioactive gas filter that adsorbs radioactive substances, a high-performance filter, and a gas processing filter. As described in the specification 0125 of the patent document, the radioactive gas removal device is assumed to be connected to an emergency emergency response base facility (offsite center).

However, regarding the radioactive gas removal device incorporating a radioactive gas filter, a high-performance filter, and a gas treatment filter that adsorbs radioactive substances, a connection method to a temporary evacuation facility in the event of an emergency is not envisaged, and there is no urgency. In a required situation, it is expected that the installation work of the radioactive gas removal apparatus will require a large amount of labor and time.

Patent Document 2 proposes a sterilization cleaning system in which a blower is adjusted by an atmospheric pressure sensor so that the room air is always kept at a certain level of cleanliness, and the building is always kept at a positive pressure.

JP 2014-35286 WO2008 / 152706

In an emergency, the air conditioning system is quickly switched to emergency so that air contaminated with radioactive materials does not flow into the temporary evacuation facility, and the amount of air supplied to the temporary evacuation facility and the amount of outdoor air It is necessary to adjust the displacement and keep the inside of the facility at a positive pressure.

When radioactive material diffuses into the atmosphere, it is necessary to switch the air conditioner for emergency so that air contaminated with the radioactive material does not flow into the temporary evacuation facility. In an emergency, connecting the emergency air conditioner to the outside air intake of the temporary evacuation facility is expected to require a lot of work.

In addition, when an emergency air conditioner is always connected to the air supply port of a temporary evacuation facility and continues to ventilate normally, the air conditioner increases the frequency of maintenance and removes radioactive substances built into the air conditioner. The air filter may become clogged with atmospheric dust, moisture in the atmosphere, gas components, etc., and in the event of an emergency, there is a risk of hindering the removal of radioactive substances, which is the original purpose.

When radioactive material is scattered in the atmosphere, radioactive xenon, radioactive krypton, radioactive iodine, radioactive cesium, etc. will float in the atmosphere as a cloud-like radioactive plume. It will adhere to the ground together with atmospheric dust.

Among radioactive substances, solid and liquid substances can be removed with HEPA filters, and gaseous substances can be removed with activated carbon rich in gas adsorption, such as activated carbon impregnated with non-radioactive iodine or potassium iodide. Is possible. However, radioactive noble gases such as radioactive xenon and radioactive krypton that have a short half-life but poor reactivity are difficult to be adsorbed by activated carbon with a high gas adsorbability, and because they are gaseous, they can trap fine particles. It is difficult to completely remove even with a possible HEPA filter.

In the present invention, in the event of an emergency, it is possible to instantly switch between an air conditioner used during normal time and an air conditioner used during an emergency while eliminating the trouble of installing an emergency air conditioner at the outside air intake of the temporary evacuation facility. Therefore, we propose an air conditioning system in a temporary evacuation facility that can prevent radioactive materials with different properties from flowing into the temporary evacuation facility.

In addition, we will propose a mechanism to prevent the radioactive material scattered from the opening of the facility from flowing into the outside, assuming that the degree of airtightness in the facility will decrease due to aging of the temporary evacuation facility or earthquake.

The present invention relates to a monitoring post for measuring the amount of radiation emitted from a radioactive substance and the type of radioactive substance, a switching damper incorporated in an air conditioning duct in a temporary evacuation facility, such as an air supply port of a normal-time air conditioner. Damper provided at the air inlet of the emergency air conditioner, damper provided at the exhaust outlet for emergency, damper provided at the air supply / exhaust outlet in the airlock chamber, and air conditioning for normal time By linking all the blowers of the aircraft and the emergency air conditioner, the temporary evacuation facility is sealed and the outdoor evacuation facility is not taken in according to the external environment. In the normal state where the outside air is taken into the facility through an emergency air conditioner with a built-in air filter for removing radioactive substances while maintaining the pressure, and the temporary evacuation facility is not sealed in the emergency. Condition , That it allows the three switching the air conditioning system, various radioactive substances having different properties, so as not to flow into the temporary evacuation site.

In addition, it is necessary to maintain a positive pressure state in the temporary evacuation facility in order to prevent atmospheric dust adhering to radioactive substances from flowing into the facility from outside the temporary air intake of the temporary evacuation facility. If the opening in the facility expands due to a decrease in the degree of sealing due to aging of the building or an external factor such as an earthquake, and the set positive pressure cannot be maintained, the differential pressure inside and outside the facility is automatically adjusted. It detects and maintains the positive pressure in the facility by automatically increasing the air flow rate.

Here, the monitoring post is a measurement point installed around the nuclear power plant that continuously monitors the radiation in the air.

According to a first aspect of the present invention, in order to prevent radioactive materials from flowing into a temporary evacuation facility, the facility is sealed from the outside based on information measured by monitoring posts provided around the facility. The outside air supply and the exhaust to the outside are not performed at all, so that radioactive materials scattered outside do not flow into the facility, and the facility is sealed to limit the supply and exhaust ports The state of keeping the inside of the facility at a positive pressure and the state of supplying and exhausting air through an air conditioner without sealing the inside of the facility in the same facility, the scattering situation of radioactive materials outdoors It is an air conditioning system that can be switched according to the conditions.

According to a second aspect of the present invention, there is provided a monitoring post for measuring a radiation dose in the atmosphere, an air inlet damper for a normal air conditioner, an air inlet damper for an emergency air conditioner, an exhaust outlet damper for an emergency, an air The air conditioning system in the temporary evacuation facility can be switched in the event of an emergency by linking all of the air supply and exhaust dampers in the lock room, the normal blower, and the emergency blower in spite of being the same facility. It is what.

The third aspect of the present invention is based on information from a monitoring post that measures the amount and type of radiation in the atmosphere, so that no-reactive radioactive noble gas does not flow into the temporary evacuation facility. It closes the mouth damper and does not allow outside air to enter or exit the facility.

According to a fourth aspect of the present invention, if the scattering of radioactive noble gas is confirmed near the temporary evacuation facility based on information from a monitoring post that measures the amount and type of radiation in the atmosphere, the air conditioning in the facility is controlled indoors. By switching to circulation and not taking in outside air, the inflow of radioactive materials into the facility is prevented.

The fifth invention in the present invention is based on the information from the monitoring post that measures the radiation dose in the atmosphere. If it can be confirmed that there is no radioactive rare gas scattering around the temporary evacuation facility in the event of an emergency, In order to prevent the radioactive material that has been poured and deposited on the ground from flowing into the facility, an emergency air conditioner is operated, and outside air is taken into the facility via the air conditioner.

According to a sixth aspect of the present invention, an emergency air conditioner installed in a temporary evacuation facility in the event of an emergency does not allow radioactive materials such as radioactive cesium and radioactive iodine attached to atmospheric dust to flow into the facility. In addition, at least two types of air filters, a radioactive carbon removal activated carbon filter and a HEPA filter, are built in.

According to a seventh aspect of the present invention, when the emergency air conditioner is in operation, the emergency air conditioner is provided between the inside and outside of the facility in order to prevent outside air from flowing in from outside the outside air intake port in the temporary evacuation facility. The air flow is supplied to the facility to keep the pressure difference at a positive pressure of 30 Pa to 150 Pa.

In an eighth aspect of the present invention, in order to prevent the positive pressure in the facility from falling below a specified range, the pressure difference inside and outside the facility is converted into a digital signal, and the blower of the emergency air conditioner is converted by an inverter. If the positive pressure level in the facility falls below the specified range due to control, the positive pressure level in the facility is always kept within a certain range by automatically detecting the fluctuation and increasing the outside air introduction amount. It can be kept in.

Hereinafter, each operation flow in this system and switching of the air conditioning system will be described.

The temporary evacuation facility 1 provided with the air-conditioning system according to the present invention is linked with the monitoring posts 11 scattered around the facility, so that the air-conditioning system of the air-conditioning system can be used in the same facility according to the scattering situation of the radioactive material outdoors. It is possible to change the specification.

If there is no scattering of radioactive material outdoors, the temporary evacuation facility 1 in the event of an emergency takes in outside air into the facility through the normal-time air conditioner 3 and exhausts it to the outside temporarily. The air lock chamber 5 installed in the evacuation facility 1 does not operate, and the outside air is not taken into the temporary evacuation facility 1 from the emergency air conditioner 4. The emergency air conditioner 4 in the present invention refers to an air conditioner that supplies outside air into the facility when radioactive substances are scattered in the atmosphere. At least, the radioactive substance removing activated carbon filter 10 and the HEPA filter 9 are used. Is built-in.

In addition, the air lock chamber in the present invention is a device having a three-chamber structure in which the atmospheric pressure is controlled, and when the emergency air conditioner 4 is in operation, the entry and exit of a person into the temporary evacuation facility 1 in the event of an emergency, It shall be performed via the airlock chamber.

In the event of an emergency, radioactive materials are scattered into the atmosphere, and when the presence of radioactive noble gas, which is a gaseous radioactive material, is confirmed at the monitoring post 11, the temporary evacuation facility 1 provided with the air conditioning system of the present invention is monitored. Since it is linked to the post 11, the all-switching damper 7 provided at the outside air intake port of the air conditioner in the facility and the all-switching damper 7 at the exhaust port are immediately blocked, and the outside air is taken into the facility, Exhaust is stopped. Until the radioactive noble gas, which is a gaseous radioactive substance, passes through the vicinity of the temporary evacuation facility 1 can be confirmed by the monitoring post 11, the sealed state in the facility is maintained. The damper used in the present invention is an air flow rate control valve provided in a duct of an air conditioner. The shape of the damper is not particularly limited as long as the duct can be closed.

Also, if the range of outdoor radioactive rare gas is wide, switch the air conditioning in the facility to indoor circulation, and keep the air conditioning function inside the facility, while preventing outside air from being taken into the temporary evacuation facility It is also possible to make it.

This series of air-conditioning system switching operations is not particularly limited, whether automatic or manual.

When the air conditioning system is automatically switched, if the monitoring post 11 confirms the floating of a radioactive noble gas that does not exist in nature, the relevant information is immediately transmitted to the temporary evacuation facility 1, and the temporary evacuation facility All the switching dampers 7 provided in the outside air intake in 1 are closed. Then, it is set in advance so that the outside air intake into the facility is stopped or the air conditioning is switched to the indoor circulation.

If the air conditioning system is switched manually, if the monitoring post 11 confirms the floating of a rare radioactive gas that does not exist in nature, the relevant information is immediately sent to the temporary evacuation facility 1 to switch the air conditioner. By pressing the switch 6, all the switching dampers provided at the outside air intake in the temporary evacuation facility 1 are closed, and the outside air intake into the facility is stopped or the air conditioning is switched to the indoor circulation. .

After confirming that radioactive noble gases have passed through the vicinity of the temporary evacuation facility 1 through the monitoring post 11 in order to prevent the radioactive material from scattering into the atmosphere and the radioactive material adhering to the atmospheric dust from entering the temporary evacuation facility 1 The air blower operating in the facility and the switching damper 7 between the emergency air conditioner 4 and the emergency exhaust port 2 are opened so that outside air can be taken into the facility through the emergency air conditioner 4. The exhaust from the facility is performed only from the emergency exhaust port 2. In addition, when the emergency air conditioner 4 is activated, people enter and exit the temporary evacuation facility 1 only from the airlock chamber 5 that has been subjected to an airlock process in order to maintain airtightness.

The blower built in the emergency air conditioner 4 is preset in advance so that the inside of the temporary evacuation facility 1 in the event of an emergency is in a positive pressure state. The atmospheric pressure in the temporary evacuation facility 1 is maintained in a positive pressure state in the range of 30 Pa to 150 Pa so that atmospheric dust attached with radioactive substances does not flow into the temporary evacuation facility 1 in an emergency.

Also, if the opening in the facility expands due to a decrease in the degree of sealing due to deterioration over time of the building or an external factor such as an earthquake, and the set positive pressure cannot be maintained, the outside air volume is automatically introduced. By keeping the positive pressure in the facility within a certain range.

Specifically, by converting the pressure difference between the inside and outside of the facility into a digital signal and controlling the blower of the emergency air conditioner with an inverter, the positive pressure level inside the facility was reduced from the specified range of 30 Pa to 150 Pa. In this case, the positive pressure in the facility can always be kept within a certain range by automatically detecting the atmospheric pressure difference from the outside and increasing the amount of outside air introduced.

When the emergency air conditioner 4 is activated, the supply of air into the temporary evacuation facility 1 is performed only via the air conditioner. The emergency air conditioner 4 incorporates at least a radioactive substance removing activated carbon filter 10 and a HEPA filter 9 in order to prevent atmospheric dust adhering to the radioactive substance from flowing into the facility. The shapes of the radioactive substance removing activated carbon filter 10 and the HEPA filter 9 are not particularly limited. Further, as necessary, a prefilter, a medium-high performance filter, or the like may be installed as a pretreatment of the radioactive substance removing activated carbon filter 10 and the HEPA filter 9.

Based on information from the monitoring post 11, a series of operations are continuously performed until the radio noble gas is dealt with and the emergency air conditioner 4 is operated and the air supply process is performed in the temporary evacuation facility 1. .

Even if the air conditioning system in the present invention is manually switched based on the result measured at the monitoring post 11, the air conditioning system in the temporary evacuation facility 1 in the event of an emergency is automatically based on the type of radioactive material set in advance. However, the gist of the present invention is not changed.

As an effect of the present invention, by linking the monitoring post 11 for measuring the radiation dose in the atmosphere and the air conditioning equipment in the temporary evacuation facility 1, radioactive substances diffused into the atmosphere in the event of an emergency can be It is possible to prevent the inflow of the air-conditioning system and to quickly switch the air conditioning system between the normal time and the emergency time without requiring much labor and time.

In the present invention, the normal-time air conditioner 3 and the emergency air-conditioner 4 are always connected to the temporary evacuation facility 1, and the operating air-conditioner is switched based on the measurement result at the monitoring post. In the event of an emergency, there is no need to install a new air conditioner or air filter for removing radioactive substances in the temporary evacuation facility 1.

When radioactive noble gases that are difficult to collect using porous activated carbon or HEPA filters that can collect fine particles approach the temporary evacuation facility 1, the radioactive noble gas is removed at the monitoring post 11. Immediately after the measurement, the air conditioner 3 for emergency use, the air conditioner 4 for emergency use in the temporary evacuation facility 1, and the switching damper 7 in the emergency exhaust port 2 are closed to prevent outside air from being taken into the facility. Thus, it is possible to prevent radioactive noble gases from flowing into the temporary evacuation facility 1.

After the radioactive rare gas passes through the vicinity of the temporary evacuation facility 1, by taking outside air into the facility through the emergency air conditioner 4 having at least two kinds of filters, activated carbon 10 for removing radioactive substances and HEPA filter 9. Thus, it is possible to create a situation in which radioactive substances attached to atmospheric dust do not flow into the temporary evacuation facility 1.

In order to keep the inside of the facility at a positive pressure when the emergency air conditioner is in operation, outside air will not be taken in from openings other than the outside air intake in the temporary facility, so prevent the inflow of radioactive materials into the facility. Can do.

In addition, the emergency air conditioner 4 installed in the temporary evacuation facility 1 is not in operation normally, and it is not vented to the built-in radioactive substance removing activated carbon filter 10 and HEPA filter 9. Sometimes, it is possible to avoid a situation where the original performance cannot be exhibited due to clogging of the filter or the like, and it is possible to reduce the maintenance frequency of the air conditioner.

Schematic diagram of temporary evacuation facility 1 Example 1 of system flow after detection of radioactive noble gas at monitoring post System flow example 2 after detection of radioactive noble gas at the monitoring post

One example of the present invention will be described below. The gist of the present invention is to switch the air conditioning system in the temporary evacuation facility in the same temporary evacuation facility according to the scattering situation of the radioactive material outdoors. Therefore, depending on the combination of the air conditioning equipment constituting the air conditioning system in the present invention, the numerical conditions related to the monitoring posts, the type of radioactive material to be sensed, or the combination of the air filters incorporated in the emergency air conditioner, The gist of the invention is not changed.

Switching damper 7 for normal air conditioner 3, switching damper 7 for emergency air conditioner 4, switching damper 7 for emergency exhaust port 2, opening / closing of air supply / exhaust port damper in air lock chamber 5, temporary evacuation in case of emergency The air lock chamber 5 in the facility 1, the blower in the normal-time air conditioner 3, and the blower in the emergency air-conditioner are linked through the monitoring posts and the system in the vicinity of the facility, and the temporary evacuation facility 1 By simply pressing the air conditioner changeover switch 6 provided in the air conditioner, the air conditioner blower is switched, the corresponding damper is opened and closed, and the air conditioning system corresponding to the outdoor radioactive material scattering state is instantly switched.

The monitoring posts 11 scattered within a radius of 20 km of the temporary evacuation facility 1 constantly check what kind of radioactive material is scattered around the temporary evacuation facility 1 and to what extent. When no abnormality is notified from the monitoring post 11, air supply / exhaust in the temporary evacuation facility 1 is performed via the normal-time air conditioner 3.

Since the monitoring post 11 and the temporary evacuation facility 1 are linked through the air conditioning system of the present invention, based on the information notified from the monitoring post 11, the radioactive material that does not exist in the natural world within a radius of 20 km of the temporary evacuation facility 1 If it is confirmed that the rare gas is scattered, the information is immediately transmitted to the temporary evacuation facility 1.

Reactive and gaseous radioactive noble gases are difficult to collect with activated carbon filters or HEPA filters, so if you can confirm the proximity of the radioactive noble gas near the temporary evacuation facility 1, the preset operation Based on the program, the switching dampers 7 provided at all the air supply openings in the temporary evacuation facility 1 and the switching dampers provided at all the exhaust outlets are automatically closed, and the air conditioner for taking in outside air is stopped. Performed all at once. As a result, supply of outside air into the temporary evacuation facility 1 and exhaust to the outside are not performed at all.

Based on the information notified from the monitoring post 11, if it can be confirmed that the radioactive noble gas floating in the atmosphere has passed around the temporary evacuation facility 1, there is a possibility that it has adhered to the atmospheric dust and dropped onto the ground. In order to prevent radioactive material from flowing into the temporary evacuation facility 1, the air conditioner changeover switch 6 is pressed to activate the blower for taking in outside air corresponding to the emergency air conditioner 4, and the emergency air conditioner 4 is used. The air conditioning system is switched so that outside air is taken into the temporary evacuation facility 1.

At this time, when the blower for taking in outside air in the emergency air conditioner 4 is started, outside air is sent into the temporary evacuation facility 1 through the emergency air conditioner 4. When the machine 4 is in operation, it is necessary to keep the inside of the facility 1 in a positive pressure state in order to prevent the inflow of atmospheric dust to which radioactive substances adhere from the gap in the temporary evacuation facility 1. Therefore, when the air blower for air supply corresponding to the emergency air conditioner 4 is started by limiting the air exhaust port in the facility 1, the damper of the emergency exhaust port 2 is opened at the same time, and the emergency blower is used. The positive pressure state in the temporary evacuation facility 1 is maintained by closing the switching damper 7 of the air conditioners other than the air conditioner 4 and the emergency exhaust port 2 and adjusting the amount of air supplied to the facility. In this embodiment, the pressure difference between the temporary evacuation facility 1 and the outside is in the range of 90 Pa to 120 Pa.

Further, when the emergency air conditioner 4 is in operation, the pressure difference inside and outside the facility is converted into a digital signal, and the blower of the emergency air conditioner 4 is controlled by an inverter. When the pressure falls below the specified range of 90 Pa to 120 Pa, the positive pressure in the facility is kept within a certain range by automatically detecting the pressure difference and increasing the outside air introduction amount.

In addition, when outside air is being supplied into the temporary evacuation facility 1 in case of emergency through the emergency air conditioner 4, a three-room structure is formed by the pressure difference between people entering and exiting the temporary evacuation facility 1. It is limited to the airlock chamber 5 which is.

The air filter built into the emergency air conditioner 4 has a three-stage filter in the order of the pre-filter 8, the HEPA filter 9, and the granular activated carbon filter for removing radioactive iodine.

    The emergency air conditioner 4 is always connected to the temporary evacuation facility 1. However, until the blower corresponding to the emergency air conditioner 4 is operated, the switching damper 7 provided in the emergency air conditioner 4 is completely closed, and the temporary evacuation facility 1 is sealed. When the normal air conditioner 3 is in operation and the temporary evacuation facility 1 is supplying and exhausting air, the emergency air conditioner 4 is not ventilated. Therefore, even if the emergency air conditioner 4 suddenly starts operation, the air filter in the air conditioner is clogged by the influence of atmospheric dust and the like, and the radioactive material is not collected in the event of an emergency. It can be avoided.

The material and shape of the pre-filter 8 built in the emergency air conditioner 4 are not particularly limited, but in order to avoid early clogging of the latter-stage HEPA filter 9 and activated carbon filter for removing radioactive iodine, A glass fiber filter medium with a high dust holding capacity is used.

In the emergency air conditioner 4, a HEPA filter 9 is installed after the prefilter 8. Outside air will be taken into the temporary evacuation facility 1 through the emergency air conditioner 4, but the fine atmospheric dust with radioactive substances such as radioactive cesium is attached to the HEPA filter 9 that can collect fine particles. Will be collected together with radioactive material.

In the emergency air conditioner 4, a radioactive iodine removing activated carbon filter is installed as a radioactive substance removing activated carbon filter 10 after the HEPA filter 9. The shape of the activated carbon filter for removing radioactive iodine is a box type in which a unit in which a granular radioactive iodine removing activated carbon is packed in a tray-like container is installed in a zigzag shape based on the amount of radioactive iodine adsorbed.

In a temporary evacuation facility where the specifications of the air conditioning system must be changed between normal and emergency situations, it is not necessary to replace the air conditioning equipment in the event of an emergency, so it is expected to be widely used for existing structures. it can.

DESCRIPTION OF SYMBOLS 1 ... Temporary evacuation facility 2 ... Emergency exhaust port 3 ... Normal air conditioner 4 ... Emergency air conditioner 5 ... Air lock room 6 ... Air conditioner changeover switch 7 ... Switching damper 8 ... Prefilter 9 ... HEPA filter 10 ... Activated carbon filter for radioactive material removal 11 ... Monitoring post 12 ... Air intake when circulating indoor air

Claims (8)

In the same facility, with the inside of the facility sealed to supply air from the outside, and without exhausting to the outside, supplying and exhausting air only through the emergency air conditioner and the emergency exhaust port while sealing the inside of the facility Switching between a state in which the inside of the facility is maintained at a positive pressure, and a state in which air is supplied from the outside and the state in which the air is exhausted to the outside by a normal-time air conditioner without sealing the inside of the facility. An air-conditioning system that can be used according to the state of material scattering. Monitoring post to measure the radiation dose in the atmosphere, air conditioner air supply air damper, emergency air conditioner air supply air damper, emergency exhaust air damper, air lock room air supply air damper 2. The air conditioning system according to claim 1, wherein the air conditioner air blower and the emergency air conditioner air blower are all linked to each other, and the supply / exhaust method to the facility can be switched. Air conditioning equipment that closes the air supply / exhaust port damper in the facility and supplies air from outside and exhausts outside when a radioactive post is confirmed in a monitoring post that measures the radiation dose in the atmosphere 3. The air conditioning system according to claim 1, wherein the operation of the air conditioning system is stopped. Claim 1, characterized in that the air conditioning in the facility is switched to indoor circulation and outside air is not taken into the facility when the scattering of radioactive noble gas is confirmed at a monitoring post that measures the radiation dose in the atmosphere. Or the air conditioning system described in 2. Based on the measurement results at the monitoring post that measures the radiation dose in the atmosphere, if it is confirmed that there is no scattering of radioactive noble gas around the facility, the emergency air conditioner is operated to supply air to the facility The air conditioning system according to any one of claims 1 to 4, wherein: 6. The air conditioning system according to claim 5, wherein the emergency air conditioner for supplying air into the facility includes at least two types of air filters, an activated carbon filter for removing radioactive substances, and a HEPA filter. The air conditioning system according to any one of claims 1, 2, 5, and 6, wherein the emergency air conditioner keeps the inside of the facility in a positive pressure state during operation. By converting the pressure difference between the inside and outside of the facility into a digital signal and controlling the blower of the emergency air conditioner with an inverter, when the positive pressure level inside the facility falls below the specified value, the fluctuation of the differential pressure is detected. 8. The air conditioning system according to claim 7, wherein the amount of outside air introduced is automatically increased to maintain the positive pressure in the facility within a certain range.