JPS6015209B2 - condensate equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to, for example, a wastewater treatment device for water contained in condensate system equipment and piping of a nuclear power plant, and particularly to a condenser hotwell and a condenser water treatment device during construction, periodic inspections, and plant shutdowns. This invention relates to a condensate system having a system for collecting water in a water pipe into a condensate storage tank via an existing condensate purification system using a pump, without treating the water in a radioactive waste treatment system.

The condensate system is a system that supplies water condensed in a condenser to the reactor via a low-pressure condensate pump, condensate purification device, etc., and the radioactive waste treatment system is a system that supplies water condensed in a condenser to a nuclear reactor through a low-pressure condensate pump, condensate purification equipment, etc. This is a device that purifies liquids, etc. that are tinged with

At the nuclear power plant in question, there were the following problems with the treatment of condensate wastewater.

In other words, since the suction side of a low-pressure condensate pump is in an extremely high vacuum and handles hot water close to the saturation temperature, consideration must be given to providing a sufficient water head on the suction side to prevent cavitation and ensure smooth operation. . From this point of view, when the water level in the condenser hotwell drops to a certain level, the operation of the low-pressure condensate pump is stopped for safety reasons. However, even after the low-pressure condensate pump is stopped, condensate remains in the condenser hotwell and condensate pipe, and conventionally, this condensate has been drained by temporarily installing a pump. For this reason, it took a long time to drain hundreds of tons of condensate, and it was difficult to drain it completely. In addition, it is necessary to prepare temporary pumps, etc., and there is a problem that it is inefficient in terms of time and economy. Here, a conventional condensate wastewater treatment system will be explained with reference to FIG.

The plant stopped due to periodic inspection, etc., and condenser hotwell 1
When the water level in the tank drops to a certain point, the low pressure condensate pump 3 stops for the reasons mentioned above.

The condensate remaining in the condenser hot water 1 and the condensate pipe 2 is collected into the equipment drain sump tank 17 through the drain pipe 4 connected to the condensate pipe 2, and then transferred to the temporarily installed sump pump 18.
The water was sent to a radioactive waste treatment system 20 through a pipe 19, purified into reusable water, and sent to a condensate storage tank 15 through a pipe 21 for storage.

In such conventional wastewater treatment methods, the capacity of the radioactive waste treatment system is small, so there are restrictions on the timing of drainage due to the radioactive waste treatment system, and the inability to dispose of a large amount of wastewater. Ta. Therefore, it takes a long time to inspect and clean the condenser hot well. Therefore, an object of the present invention is to eliminate the inconveniences of the prior art as described above, to quickly perform wastewater treatment in the condenser hot well and condensate pipe during periodic plant inspections, and to perform inspection of the condenser hot well, An object of the present invention is to provide a condensate device having a system for sending wastewater to a condensate storage tank using an existing condensate purification device in order to shorten cleaning time.

Another object of the present invention is to provide a condensate system that is free from restrictions on the timing and amount of drainage by treating wastewater in a system independent of the radioactive waste treatment system.

Still another object of the present invention is to provide a condensation device that prevents the radioactive waste treatment system from increasing in size by reducing the amount of wastewater sent to the radioactive waste treatment system. It is in.

An embodiment to which the present invention is applied will be described with reference to FIG.

In Figure 2, 1 is the condenser hot well, 2 is the condensate pipe,
3 is a low-pressure condensate pump. 13 is a condensate purification device, and 15 is a condensate storage tank. This configuration is a conventional system, and in the present invention, a bypass system 16 shown by a broken line is installed in parallel with the conventional system. That is, during normal plant operation, the valve 5 is closed, and condensate is sent to the condensate purification device 13 through the condensate pipe 21 and the low-pressure condensate pump 8. On the other hand,
After the plant has stopped, the water level in the condenser hot well 1 has dropped to a certain point, and the low pressure condensate pump 3 has stopped, the valve 5
The residual water in the condenser hotwell and condensate pipe 2 is sent to the tank 7 via the control valve 6 through the drain pipe 4 and stored therein. The water stored in the tank 7 is sent to the pipe 12 after the outlet of the low-pressure condensate pump 3 through the pipe 11 via the valves 9 and 10 by the pump 8.The amount of wastewater flowing into the tank 7 is regulated by control valve 6 and pump 8
Activation/stopping of the tank 7 is controlled by detecting the water level in the tank 7. The water sent to the pipe 12 is purified through the condensate purification device 13 and then collected into the condensate storage tank 15 through the existing pipe 14.

Water resource management of the recovered water can be done using the existing sampling system at the outlet of the condensate purifier.

As another embodiment of the present invention, as shown in FIG. 3, in place of the tank 7 and pump 8 in FIG.
It is also possible to use the existing condensate recovery tank 27 and condensate recovery pump 28.

As described above, according to the present invention, the condenser hot well and condensate pipe can be drained quickly during periodic inspections of nuclear power plants, and the condenser hot well can be inspected and cleaned. This has the effect of shortening the time required. In addition, since the radioactive waste treatment system used for wastewater treatment is not used, there is no restriction on the timing and amount of drainage.

Furthermore, by reducing the amount of wastewater sent to the radioactive waste treatment system, there is an effect of preventing the radioactive waste treatment system from becoming larger.

As described above, it is believed that the above-mentioned great effects can be achieved by installing the simple and economical system according to the present invention in the condensation equipment of a nuclear power plant.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a conventional embodiment, Fig. 2 shows a conventional embodiment;
The figure shows one embodiment of the invention, and FIG. 3 shows another embodiment of the invention.

Turtle... Condenser hot well, 3... Low pressure condensate pump, 7... Tank, 8... Pump, 13... Condensate purification device, 15... Condensate storage tank, i6... ..."Bypass system, 20...Radioactive waste treatment system.

Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 In a condensing device that sends condensate accumulated in the condenser hot well to the condensate purification device via a low pressure condensate pump, when the low pressure condensate pump is stopped, the condensate accumulated in the condenser hot well is sent to the condensate purification device A condensing device characterized by having a bypass system for sending water to the water.