JPS59145998A - Emergency gas processor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] Kinoe UA has developed an emergency gas treatment system (h
It is related to.

[Prior art]

A summary of the conventional emergency gas processing equipment and other radioactive gas processing equipment is shown in FIGS. 1 and 2. Conventionally, the emergency gas processing equipment and the radioactive waste processing equipment were separated, and the number of filters was 2 in series for the emergency gas processing equipment and 1 for the radioactive gas processing equipment, equipment cost, and installation. There was a problem with excess space.

A conventional emergency gas treatment device and radioactive gas treatment device will be explained with reference to FIG. During normal operation of the nuclear reactor, radioactive gas generated inside the tank 8 is treated by the filter 9, and the treated gas is guided to the main exhaust tower 12 by the fan lO1 pipe 11.

In the event of an accident, the radioactive gas generated inside the secondary containment facility is extracted by the detector 3, processed by the filter 4゜5, and then guided to the main exhaust tower by the fan 6 and piping 7. . During normal reactor operation, only the radioactive gas treatment equipment operates, and in the event of an accident, only the emergency waste treatment equipment operates.

FIG. 1 shows a case where the filter 4.5 of the emergency gas treatment device 2 is installed outside the secondary containment facility 2.

The platform fan 6 is installed downstream of the filters 4 and 5 in order to completely prevent untreated radioactive gas from being released outside the secondary containment facility 2.

FIG. 2 shows a case where the filter 4.5 of the emergency gas treatment device is installed within the secondary containment facility 2.

In this case, the fan 6 is installed upstream of the filters 4 and 5 in order to prevent untreated radioactive gas from being released outside the secondary containment facility 2.

[Purpose of the invention]

The feature 11'J of the present invention is that the filter outlet of the emergency gas treatment device and the filter inlet piping of the radioactive gas treatment device are changed from two rows of filters in the conventional emergency gas treatment device to one. The purpose of the present invention is to provide an emergency gas processing device that can be connected with a common filter, has the same processing capacity as a conventional emergency gas processing device, has low equipment costs, and has a small installation space.

[Outline of the invention]

In the present invention, we focused on the fact that radioactive gas processing equipment in regular use (e.g., tank vent system) has filters with almost the same capacity (@σ), which are not used in the event of an accident, and by connecting the two with piping, we During operation, it operates as a radioactive gas treatment device, and in the event of an accident, it uses two filters as an emergency gas treatment device, and has the same effect as the conventional iodine effect. As a result, the emergency gas processing equipment and (~
In this way, efficiency can be enhanced with half the equipment and layout of conventional equipment.
For plant function in the event of an accident: Excess equipment* can be used without having to use all of it, and can prevent multiple complexes when placed inside the reactor building. Furthermore, even when it becomes necessary to increase the efficiency of an existing plant with only one filter, it can be easily handled.

[Embodiments of the invention]

Is this an embodiment of the present invention? This will be explained with reference to FIG. In the embodiment shown in FIG. 3, of the filters 4 and 5 of the conventional emergency gas processing device shown in FIG. It is connected to the filter 9 of the radioactive gas processing device through the VC.

] During normal operation, the valve 20 is closed and the radioactive gas processing apparatus is operated independently. In the event of an accident (reactor coolant loss accident), the radioactive gas processing equipment is isolated by the valve 21 and is not operated. The emergency gas treatment system is operated instead, but at that time the valve 20 is opened and the contamination inside the secondary containment facility 2 is removed via the fan 6, filter 4, piping 7, filter 9, and fan 1o. The air is purified and released from the main exhaust tower 12.

The present invention shows a configuration in which the emergency gas processing device is installed in a secondary containment facility, and the fuhean 6 is installed downstream of the filter 4 so that the leak becomes purified air. There is. According to the present invention, by sharing the filter metal of the radioactive gas processing equipment that is not in operation at the time of an accident as an emergency gas processing equipment,
As an emergency gas treatment system, the iodine removal efficiency can be doubled with a single filter, so there is no need for extensive equipment design for equipment that is activated in the event of an accident, and the building layout is simplified, making maintenance easier and easier. We can provide highly efficient equipment.

Figure 4 shows other implementations 1+lI, and the actual 11 cases are 1,
This is the case where the filter 4 of the emergency gas treatment device is installed inside the secondary containment facility 2, which is similar to that explained in FIG.

FIG. 5 shows all other embodiments, and this embodiment is basically the same as that explained in FIG.
In order to prevent negative pressure from becoming large inside, the pipe 7 and the filter 4 artificial line are connected by a pipe 14, and a circulation line is provided. This loop flow meter is adjusted by a valve 13.

6th South shows yet another embodiment, and this embodiment is similar to the one explained in FIG. .

FIG. 7 shows yet another embodiment 2u. This embodiment is basically the same as that explained in FIG. As shown, the case where the pipe 7 and the filter 9 output line are connected by the pipe 18 to provide a filter 9 bypass line is shown.

When using filter 9, fully open fP15 and close valve 17.
Close.

When filter 9 is not used, valve 1.5' is closed and valve J7 is fully opened. This embodiment also shows that the fan 10 can be shared.

FIG. 8 shows yet another embodiment, and this embodiment is similar to the one explained in FIG. .

〔Effect of the invention〕

According to the present invention, the radioactive gas treatment system (for example, tank vent system) equipment that was used only during normal operation can be used as a reinforcement for the emergency gas treatment system, so that it can be used in common for operation at the time of a plant accident. Unlike the treatment equipment, the removal efficiency can be doubled even with only one filter instead of having two layers (double filter equipment), resulting in a significant reduction in equipment costs. In addition, since there is no need for large additional equipment due to the equipment layout inside the reactor building, the configuration is simple and maintenance is easy.
Inspectability can be improved. Since this system needs to operate reliably in the event of an accident, it is composed of two independent systems, which simplifies the system (reduces the number of equipment and shielding materials, reduces construction costs, and reduces building space. In addition, even existing plants with one filter train as emergency gas processing equipment can be handled with the conventional number of equipment, so it can be applied to increase the performance of new and old plants alike.

[Brief explanation of the drawing]

Figures 1 and 2 are system diagrams of conventional emergency gas processing equipment and radioactive gas processing equipment, respectively; Figure 3 is a system diagram of an embodiment of the emergency gas processing equipment of the present invention; FIG. 5, FIG. 6, FIG. 7, and FIG. 8 are system diagrams of other embodiments of the emergency gas treatment apparatus of the present invention.

Claims (1)

[Claims] 1. Reactor building, exhaust fans, filters, piping, valves! In the emergency gas processing equipment constructed by 7M, the filter outlet of the emergency gas processing equipment is connected with the filter inlet of another radioactive gas processing equipment having a filter casing for radioactive scrap metal processing, and the filter casing is shared. emergency gas treatment equipment.