JPH0136011B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an air conditioning system for a facility that handles radioactive materials, and particularly in an environment where the outside air is contaminated with radioactive materials, in a living room where workers and others stay. , relates to an air conditioner suitable for radiation protection when workers are working.

[Technical background of the invention]

An air conditioning system for a central control room (corresponding to the living room) in a conventional nuclear power plant will be described with reference to FIG. The central control room, ie, the air conditioner for the living room, is capable of providing radiation protection to workers in the living room even in an environment where the outside air is contaminated with radioactive materials.

In Fig. 1, when the outside air is not contaminated with radioactive materials, some fresh outside air is taken in from the outside air intake 1 through the duct 3 via the remotely operated air intake valve 2, and the return air from the living room 4 is taken in. After merging with
The air conditioner 5 adjusts the temperature and humidity, and the blower 6
The air pressure is increased at the pump and appropriate air is supplied to the living room 4.
Most of the air from the living room 4 is returned to the air conditioner 5 through a duct 7, but some air is returned to the air outlet 1 by an exhaust fan 9 via a remotely operated air exhaust valve 8.
0 to the outside.

On the other hand, when the outside air is contaminated with radioactive substances, the radioactive substances in the outside air are detected by an outside air radioactive substance detection means (not shown) and the contamination of the outside air is determined. Then, the damper opening/closing means closes the outside air intake valve 2 and the air exhaust valve 8, cuts off air communication with the outside, closes the remotely actuated first damper 11, and opens the second damper 12. (not shown), living room 4 → radioactivity removal device 13 → booster fan 14
→ Air conditioner 5 → Blower 6 → Closed loop circulation of living room 4 is performed. The radioactivity removal device 13 is provided for the purpose of removing radioactive substances that flow into the closed loop system in small amounts due to contamination of the external environment.

[Problems with background technology]

The above-mentioned air conditioner has the following problems. In other words, although the method of cutting off air communication with the outside and using the radioactivity removal device 13 for closed-loop circulation can fulfill the role of radioactivity protection, it is not suitable for workers staying in the living room 4 for a long period of time. , it is necessary to replenish the oxygen consumed by workers and remove the carbon dioxide gas emitted. Focusing on carbon dioxide gas, the legally permissible concentration is 0.1VOL% or less, and according to research reports.
It is said that a level of 4VOL% or higher causes problems for humans to make normal judgments. Assuming that 10 people stay in living room 4, which has a space of ^2500m3 ,
After 15 days, the carbon dioxide concentration exceeded 4 VOL%, making it difficult to live there. Therefore, in order to keep the carbon dioxide concentration below the permissible standard value, it is necessary to open the air intake valve 2 and the air exhaust valve 8 to resume intake of outside air.

In conventional ventilation equipment, the air intake valve 2 and the air exhaust valve 8 are normally open, and are closed when the outside air is contaminated for the main purpose of radiation protection. The valves are connected in series to ensure isolation, but when restarting the air intake as described above, it is necessary to consider the case where even one of the valves 2 and 8 fails to open due to a failure in the drive source, etc. It cannot be said that it is fully functional.

[Purpose of the invention]

The purpose of the present invention is to ensure radiation protection for workers in living rooms where workers and others stay in environments where the outside air is contaminated with radioactive substances, and to provide long-term protection from the aspect of livability. The object of the present invention is to provide an air conditioner that can maintain an environment in which the user can stay for a long period of time.

[Summary of the Invention] In the present invention, when the outside air intake valve and the air exhaust valve are opened to let contaminated outside air into the living room through the radioactivity removal device, a plurality of outside air intake valves and a plurality of air exhaust valves are connected in parallel. In this way, even if one drive source fails and the air intake valve and air exhaust valve of that system do not open, they can be driven by separate drive sources. By opening the air intake valve and air exhaust valve of the system, outside air is reliably taken in, allowing workers to stay in the living room for a long period of time.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

The living room 4 is connected by a duct 7 so that air is circulated through a remotely operated first damper 11, an air conditioner 5, and a blower 6. In this case, the air conditioner 5 and the blower 6 are connected in series and two are connected in parallel. A plurality of remotely operated air intake valves 2 and 15 are connected in parallel from the outside air intake port 1 to the upstream side of the first damper 11 through a duct 3, and the outside air is combined with the circulating air. Try to get it. Then, a part of the air in the living room 4 is connected to a plurality of remotely operated air exhaust valves 8 and 16 in parallel and an exhaust fan 9 so that a part of the air can be exhausted to the outside air from an air exhaust port 10. do. In this case, the exhaust fan 9 is 2
Keep them in parallel. In parallel to the first damper 11, a remotely operated second damper 12, a radiation removal device 13, and a booster fan 14 are connected in series. In this case the second damper 1
2 and booster fan 14 are arranged in parallel.

Therefore, the air intake valves 2, 15 and the air exhaust valve 8,
Among 16, those with a long open period are kept open almost continuously when the outside air is not contaminated, are closed when the outside air is contaminated, and are opened when the outside air continues to be contaminated for a long time. Commonly used air intake valve 2
and a regular air exhaust valve 8, respectively, valve 2,
Put two 8's in series. In addition, it is closed when the outside air is not contaminated, and if the outside air continues to be contaminated for a long time and you want to open the regular air intake valve 2 and air exhaust valve 8, the driving source (electricity or gas power, etc.) Two emergency air intake valves 15 and two emergency air exhaust valves 16, which can be opened by another drive source when they fail to open due to a failure, are arranged in parallel. A gas concentration monitoring device 17 is installed in the living room 4 to detect an excess of carbon dioxide or a shortage of oxygen, and the opening of the air intake valves 2, 15 and the air exhaust valves 8, 16 is adjusted to control the amount of outside air intake. be limited to the necessary minimum.

Next, the effect will be explained.

When the outside air is contaminated with radioactive substances, as explained in the conventional example, the air intake valves 2 and 15 and the air exhaust valves 8 and 16 are temporarily closed, the first damper 11 is closed, and the second The damper 12 is opened, and the living room 4 → radioactivity removal device 13 → booster fan 14
→ Air conditioner 5 → Blower 6 → Living room 4 is circulated in a closed loop, and trace amounts of radioactive substances flowing into this closed loop system are removed by the radioactivity removal device 13 to ensure the safety of the workers. However, if the outside air continues to be contaminated for a long period of time and the above condition continues, carbon dioxide gas in the living room 4 will increase and oxygen will become insufficient. At this time, the gas concentration detection device 17 detects an excess of carbon dioxide gas or a shortage of oxygen, and opens either the air intake valves 2 or 15 or the air exhaust valves 8 or 16 to prevent contamination. The environment of the living room is improved by taking in the necessary minimum amount of outside air and supplying it to the living room as clean air through a radioactivity removal device 13.

However, since the normally used air intake valve 2 and air exhaust valve 8 have a long open period, two valves 2 and 8 each with different driving sources are connected in series to ensure that they are closed once the outside air is contaminated. Therefore, if the outside air has been contaminated for a long time and you want to open it, you will not be able to take in outside air unless even one of them is opened. Therefore,
The provision of emergency air intake valves 15 and air exhaust valves 16 is helpful. This emergency valve 1
Since the valves 5 and 16 are always closed, the outside air can be shut off reliably without having to connect the two in series. Each valve is driven by a separate drive source, so even if one of the drive sources fails, the probability that all of them will fail at the same time is extremely small, so any valve can be opened and is reliable. This results in an air conditioning system with extremely high performance.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reliably prevent radioactive materials from entering a living room from the outside, and to remove radioactive materials from fresh air when workers stay for a long time, regardless of outside air contamination. A highly reliable air conditioner that can be reliably installed while being removed can be obtained.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a conventional air conditioner, and FIG. 2 is a system diagram showing an embodiment of the air conditioner according to the present invention. 1... Outside air intake, 2... Regular air intake valve,
4... Living room, 5... Air conditioner, 8... Commonly used air exhaust valve, 10... Air exhaust port, 11... First
damper, 12... second damper, 13... radioactivity removal device, 15... emergency air intake valve, 16
...Emergency air exhaust valve, 17...Gas concentration monitoring device.

Claims (1)

[Claims] 1. An outside air intake that takes outside air into the system, an outside air radioactive material detection manual that detects radioactive materials in the outside air and determines whether the outside air is contaminated, and an air intake valve that closes to shut off the outside air when the outside air is contaminated. A first damper is installed downstream of the confluence of the air introduced from the air intake and the air taken out from the living room and closes when the outside air is contaminated, and the first damper is installed in parallel with the first damper. a second damper that opens when the outside air is contaminated; a radioactivity removal device that is disposed downstream of the second damper and removes radioactivity from the incoming air;
an air conditioner disposed downstream from the downstream confluence of the first damper and the second damper, which adjusts the temperature and humidity of the incoming air and introduces the air into the living room; It is equipped with an air exhaust port that discharges a portion of the air to the outside air, and an air exhaust valve that is disposed upstream of the air exhaust port and closes when the outside air is contaminated to shut off the air guided to the air exhaust port. In the air conditioner, three sets of the air intake valves and the air exhaust valves are each arranged in parallel and each set is driven by a separate drive source, and the air intake valves and the air exhaust valves are regularly used ones that are open for a long time. , and an emergency type that is closed at all times and opened only in case of an emergency.The regular type has two valves in series, and the emergency type has two valves in parallel. An air conditioner comprising a gas concentration monitoring device that detects an excess of gas or a shortage of oxygen and opens the regularly used air intake valve and air exhaust valve.