JPH05249286A - Drain collector for nuclear power plant - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to prevent drain flushing. [Constitution] The maximum pressure water heater and the next stage water heater are installed below the building floor where the moisture separation heater is installed, and the next stage water heater is heated below the installation position of the next stage water heater. A drain cooler for cooling the drain from the reactor is installed, and a drain recovery tank for storing the drain from the drain cooler is installed below the installation position of the next-stage feed water heater. In addition, a drain recovery is required to store the drain from the next-stage feed water heater and the drain from the moisture separator of the moisture separation heater below the installation position of the maximum pressure feed water heater and the next-stage feed water heater. The drain cooler for cooling the drain from the drain recovery tank is installed below the installation position of the drain recovery tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater for a moisture separation heater and a drain for the moisture separator in a nuclear power plant, together with the drain for a feed water heater, to a drain pump for boosting the pressure to a condensate pipe. The present invention relates to a drain recovery device for a nuclear power plant that is designed to be recovered.

[0002]

2. Description of the Related Art Generally, in a boiling water type or pressurized water type nuclear power plant, steam generated in a nuclear reactor is moist steam having a lower pressure than steam generated in a boiler in a thermal power plant. Moisture in the steam rapidly increases in the process in which the wet steam expands in the turbine and is converted into mechanical energy. If steam with a high moisture content is directly introduced into the subsequent low-pressure turbine, erosion inside the turbine will be promoted and turbine performance will be degraded, so a moisture separation heater is installed between the high-pressure turbine and the low-pressure turbine. The steam moisture is removed and reheated.
In the moisture separator housed in the moisture separator heater, the moisture in the high pressure turbine exhaust steam is removed and discharged as a moisture separator drain. Similarly, in the heater housed in the moisture separation heater, the steam extracted from the moisture separator is heated (reheated) using the turbine extraction air and main steam, and the turbine extraction air and The main steam is condensed and discharged as a heater drain. These moisture separator drain and heater drain are configured to be routed to the feedwater heater in the turbine cycle for further heat recovery.

Further, as described above, in the nuclear power plant, since steam flowing into the turbine is wet steam having a low pressure, a large amount of turbine extraction steam is required to heat the feed water heater. This turbine extracted steam performs heat exchange with condensate water or feed water in each feed water heater and then condenses to generate a large amount of drain. Recently, in order to make maximum use of the heat of the feed water heater drain, a system in which the feed water heater drain and the above-mentioned moisture separator drain and heater drain are pressurized by a drain pump and collected in a condensate pipe, that is, a drain Pump-up systems are used in many nuclear power plants. As a result, the efficiency of the power plant can be increased by about 2.3% in combination with the adoption of the moisture separation heater described above.
The degree can be improved.

FIG. 9 shows an example of a drain recovery device that has already been proposed in a nuclear power plant that employs the above-mentioned moisture separation heater and drain pump up system.

The steam generated in the steam generator 1 is supplied to the main steam pipe 2
Through the high pressure turbine 3, and expands and works in the high pressure turbine 3. The exhaust steam of the high-pressure turbine 3 is guided to the moisture separator / heater 5 through the low-temperature reheat steam pipe 4.
As shown in FIG. 9, the moisture separator / heater 5 contains a moisture separator 6 and heaters 7 and 8. In the moisture separator 5, moisture in the steam is removed and discharged by the moisture separating element. In the heater 7, the outlet steam of the moisture separator 6 is heated by turbine bleed air from the middle stage of the high-pressure turbine 3 guided by the bleed pipe 9, and the turbine bleed air that has undergone heat exchange is condensed and discharged as a heater drain. To be done. Further, in the heater 8, the outlet steam of the heater 7 is heated by the main steam branched from the main steam pipe 2, and the main steam after the heat exchange is condensed and similarly discharged as a heater drain.

The steam exiting the moisture separator / heater 5 is sent to the low-pressure turbine 11 through the high-temperature reheat steam pipe 10, and is further worked and then condensed in the condenser 12 to be condensed water. This condensate is pressurized by the condensate pump 13 and then the low pressure turbine 1
Low-pressure feed water heater 1 that uses turbine extraction air from 1 as a heating source
It is heated by 4 and 15 and sent to the steam generator feed pump 17 through the condensate pipe 16. Condensed water is further increased in pressure by the steam generator feed water pump 17 to become feed water, which is further heated by the two-stage high-pressure feed water heater, that is, the next-stage feed water heater 18 and the highest pressure feed water heater 19, and then the feed water pipe 2
0 to the steam generator 1. Here, the next-stage feed water heater 18 is heated by the exhaust steam of the high-pressure turbine 3 passing through the extraction pipe 21 branched from the low-temperature reheat steam pipe 4. Turbine extraction air is sent to the highest pressure feed water heater 19 from the intermediate stage of the high-pressure turbine 3 downstream of the extraction stage for the heater 7 through the extraction pipe 22 to perform heating.

On the other hand, the drain generated in the moisture separator 6 is temporarily stored in the moisture separator drain tank 23 and then sent to the next stage feed water heater 18 through the moisture separator drain tank water level control valve 24. .. Further, the drain generated in the heaters 7 and 8 is temporarily stored in the heater drain tanks 25 and 26, and then is sent to the maximum pressure feed water heater 19 through the heater drain tank water level control valves 27 and 28. There is. In the maximum pressure feed water heater 19, the feed water is heated by the turbine extraction air from the extraction pipe 22 and the heater drain, and the drain from the maximum pressure feed water heater 19 is cascaded by the pressure difference and sent to the next stage feed water heater 18. Be done. Next stage water heater 18
In, the feed water is heated by the exhaust steam of the high-pressure turbine 3 passing through the extraction pipe 21, the moisture separator drain, and the highest pressure feed water heater drain. Further, the drain from the next-stage feed water heater 18 is pressurized by the drain pump 29 to be condensed in the condensate pipe 16.
The heat is recovered by mixing with condensate. The drain of the low-pressure feed water heater 15 is sent to the low-pressure feed water heater 14 in a cascade, and finally collected in the condenser 12.

As described above, in the above-described drain recovery device, the heater of the moisture separation heater and the drain of the moisture separator are sent to the condensate pipe by the drain pump together with the drain of the feed water heater to recover the heat and the efficiency of the power plant. We are making improvements.

[0009]

However, the above-mentioned drain recovery device has a drawback that the drain is flushed as described below and the drain cannot be transferred smoothly.

That is, in FIG. 9, the moisture separator 6 and the next stage feed water heater 18 are communicated with each other by the extraction pipe 21 and are at substantially the same pressure. Here, when the saturated drain generated in the moisture separator 6 is sent to the next-stage feed water heater 18, a drain flush occurs in the moisture separator drain tank water level control valve 24 due to insufficient pressure difference, and the drain flushes. In some cases, the smooth water transfer of the water was hindered and the drain water level control of the moisture separator drain tank 23 became impossible.

Further, since the drain from the next-stage feed water heater 18 is also a saturated drain in general, the drain is likely to be flushed in the pipeline for sending the saturated drain to the drain pump 29. In particular, when the drain flushes to generate bubbles when the load of the power plant fluctuates and the pressure in the next stage feed water heater 18 changes, the bubbles may flow into the drain pump 29 and damage the drain pump 29. There was

As described above, since the conventional drain recovery device does not take effective measures against the above-mentioned drain flushing, malfunction of drain water level control and damage of the drain pump often occur, resulting in a safe power plant. It often hindered driving.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly reliable drain recovery device which prevents harmful drain flash.

[0014]

A drain recovery device for a nuclear power plant according to the present invention as set forth in claims 1, 2 and 3 has a maximum pressure water supply below a building floor surface on which a moisture separation heater is installed. Install the heater and the next-stage feed water heater, and install the drain cooler to cool the drain from the next-stage feed water heater below the installation position of the next-stage feed water heater. It is characterized by installing a drain recovery tank below it to store the drain from the drain cooler.

Then, the drain from the heater of the moisture separation heater is supplied to the highest pressure feed water heater, the drain from the highest pressure feed water heater is supplied to the next stage water feed heater, and the drain of the moisture separation heater is supplied. The drain from the moisture separator is supplied to the drain recovery tank.

Further, the drain from the heater of the moisture separation heater is supplied to the highest pressure feed water heater, the drain from the highest pressure feed water heater is supplied to the next stage water feed heater, and the drain of the moisture separation heater is supplied. The drain from the moisture separator is supplied to the drain cooler.

On the other hand, in the drain recovery device of the nuclear power plant according to the present invention as defined in claims 4, 5 and 6, the maximum pressure feed water heater and the following are provided below the building floor where the moisture separation heater is installed. Install the stage feed water heater, and store the drain from the next stage feed water heater and the drain from the moisture separator of the moisture separation heater below the installation position of the maximum pressure feed water heater and the next stage feed water heater. To install a drain recovery tank,
The feature is that a drain cooler for cooling the drain from the drain recovery tank is installed below the installation position of the drain recovery tank.

The drain from the heater of the moisture separation heater is supplied to the maximum pressure feed water heater, and the drain from the maximum pressure feed water heater is supplied to the next stage feed water heater.

Further, the drain from the heater of the moisture separation heater is supplied to the maximum pressure feed water heater, and the drain from the maximum pressure feed water heater is supplied to the drain recovery tank.

[0020]

In the drain recovery device of the present invention as set forth in claims 1, 2 and 3, the maximum pressure feed water heater and the next stage feed water heater are installed below the building floor surface where the moisture separation heater is installed. Further, a drain cooler that uses the feed water downstream of the steam generator feed water pump as a cooling medium is installed further below to cool (subcool) the drain from the next-stage feed water heater. For this reason, since the drain on the drain cooler outlet side is always in a supercooled state, the drain in the pipeline that is sent to the drain pump does not flash. Also, a drain recovery tank is installed below the installation position of the next-stage feed water heater, and the drain from the moisture separator drain tank is sent to the drain recovery tank together with the drain from the drain cooler. The equipment drain is smoothly collected with a sufficient position difference and no drain flush occurs.

On the other hand, in the drain recovery apparatus of the present invention as defined in claims 4, 5 and 6, the maximum pressure feed water heater and the next stage feed water heater are located below the floor of the building where the moisture separation heater is installed. And the drain recovery tank is installed further downward, and the moisture separator drain from the moisture separator drain tank is smoothly recovered in the drain recovery tank with a sufficient positional difference. In addition, a drain cooler is installed below the drain recovery tank installation position to cool (subcool) the drain from the drain recovery tank and supply it to the drain pump, preventing the drain from flushing in the pipeline that sends it to the drain pump. ing.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same components as those in the above-described specific example in FIG. 9 are designated by the same reference numerals and described.

FIG. 1 is a block diagram showing an embodiment of the drain recovery device of the present invention. 1 is different from that of FIG. 9 in that a drain cooler 30 using the feed water as a cooling medium is installed in the water feed pipe downstream of the steam generator water feed pump 17, and the drain from the next-stage feed water heater 18 is The water is sent to the drain cooler 30 and exchanges heat with the water supply downstream of the steam generator water supply pump 17 to be cooled (subcooled). Further, a drain recovery tank 31 is installed in the drain conduit from the drain cooler 30, and the drain from the drain cooler 30 and the moisture separator drain from the moisture separation drain tank 23 are sent to the drain recovery tank 31. ing.

FIG. 2 is a diagram showing the installation positions of the respective devices and the drain conduit in the embodiment of FIG. The moisture separation heater 5 and the high-pressure feed water heaters 18 and 19 are generally installed on both sides of the turbine shaft, that is, two series, but in this figure, only one side (one series) is shown for convenience. In addition, generally, the moisture separation heater 5 is provided on the building floor surface provided with the high-pressure turbine 3 and the low-pressure turbine 11, that is, on the floor where the turbine is operating, and on the floor that is one floor below the turbine operating floor. In some cases, the moisture separation heater 5 is provided on the floor one floor below the turbine operation floor.

As shown in FIG. 2, the maximum pressure feed water heater 19 and the next-stage feed water heater 18 are installed on the floor below the floor on which the moisture separation heater 5 is installed. The drains generated in the heaters 7 and 8 of the moisture separator / heater 5 are temporarily stored in the heater drain tanks 25 and 26 on the floor where the moisture separator / heater 5 is installed, and then, respectively, after the heater drain tank water level control valve 27. ，
Both are sent to the highest pressure feed water heater 19 through 28. The next stage feed water heater 18 collects the drain from the highest pressure feed water heater 19. A drain cooler 30 that is cooled by the feed water downstream of the steam generator feed pump 17 is provided below the installation position of the next-stage feed water heater 18, and the drain from the next-stage feed water heater 18 is sent to the drain cooler 30. It is configured to be cooled. Similarly, a drain recovery tank 31 is provided below the installation position of the next-stage feed water heater 18. Moisture Separation Heater 5 Moisture Separator 6
After being temporarily stored in the moisture separator drain tank 23 on the floor on which the moisture separator / heater 5 is installed, the drainage generated in step 1 passes through the moisture separator drain tank water level control valve 24 on the floor on which the drain recovery tank 31 is installed. Then, it is sent to the drain recovery tank 31 together with the drain from the drain cooler 30. In the drain recovery tank 31, the drain from the moisture separator drain and the drain from the drain cooler 30 are merged and stored once, and then the drain is sent to the drain pump 29. In addition, drain cooler 3
In order to fill 0 with drain, the drain recovery tank 31 is arranged so that the drain water level in the tank is slightly higher than the top of the drain cooler 30.

In this embodiment, the heater drain of the moisture separation heater, the moisture separator drain, the highest pressure feed water heater drain and the next-stage feed water heater drain are smoothly transferred as follows to flush the drain. Drain can be supplied to the drain pump without generating

Since the turbine bleed air to the heater 7 is bleed from the upstream side paragraph of the high pressure turbine 3 rather than the turbine bleed air to the highest pressure feed water heater 19, the pressure of the drain of the heater 7 which is the condensation drain thereof is the maximum. The pressure of the high-pressure feed water heater 19 is higher than that of the high-pressure feed water heater 19, and since the drain of the heater 8 is the main steam drain, the pressure is naturally higher than the pressure of the highest-pressure feed water heater 19. Therefore, the drains of the heater drain tanks 25 and 26 are sent to the maximum pressure feed water heater 19 by utilizing this pressure difference. Similarly, the drain from the maximum pressure feed water heater 19 can be transferred to the next stage feed water heater 18 without any problem due to the pressure difference.

One of the features of this embodiment is that the drain from the next-stage feed water heater 18 is sent to the drain cooler 30 installed on the floor further below due to the positional difference to cool the drain (subcool). Drain cooler 3
At 0, since the drain is cooled by the water supply downstream of the steam generator feed pump 17, the drain at the outlet of the drain cooler 30 becomes a supercooled drain. The supercooled drain is further merged with the moisture separator drain in the drain recovery tank 31 and temporarily stored. Since the combined moisture separator drain is a saturated drain, the temperature of the supercooled drain from the drain cooler 30 slightly rises in the drain recovery tank 31, but generally the drain cooler 30 outlet drain amount, that is, the next stage feed water heater 18 outlet. Since the drain amount is overwhelmingly large, the drain leaving the drain recovery tank 31 is still a supercooled drain, and this drain is stably fed to the drain pump 29.

Further, the feature of this embodiment is that the drain of the moisture separator drain tank 23 is guided to the drain recovery tank 31. As described above, the pressure of the moisture separator drain is almost the same as the pressure of the next stage feed water heater 18, that is, the pressure of the drain recovery tank 31. However, in this embodiment, as shown in FIG. 2, the next stage feed water heater 18 is provided between the moisture separation drain tank 23 and the drain recovery tank 31.
A sufficient positional difference is provided across the installation floor. Generally, in a building of a nuclear power plant, the distance between floors is about 8 m. Therefore, in this embodiment, the distance between the drain water level of the moisture separator drain tank 23 and the drain water level of the drain recovery tank 31 is about 12 m. The position difference can be secured. Therefore, from the moisture separator drain tank 23 to the drain recovery tank 31
Moisture separator drain tank water level control valve 2 installed up to
It is possible to give a sufficient hydrostatic head to No. 4 so that no drain flush occurs. Further, the water level control of the moisture separator drain tank 23 can be performed without any trouble by the moisture separator drain tank water level control valve 24.

As described above, according to this embodiment, the drain generated in the moisture separator 6 can be transferred smoothly without flushing the drain in the moisture separator drain tank water level control valve 24. The water level of the moisture separator drain tank 23 can be controlled well. Further, the drain from the next stage feed water heater 18 is cooled by the drain cooler 30,
Since the drain at the outlet of the drain cooler 30 is sent to the drain pump 29 as a supercooling drain, the drain does not flash in the drain pipe line to the drain pump 29.
Next-stage feed water heater 18 due to load fluctuations in the power plant
Even when the internal pressure changes, the drain pump 29 is not damaged by the inclusion of bubbles unlike the prior art.

In the above-described embodiment, the drain from the moisture separator drain tank 23 is configured to be recovered in the drain recovery tank 31, but as shown in FIGS. 3 and 4, the moisture separation is performed. The device drain may be guided to the drain cooler 30. In the case of this embodiment, it is possible to arrange the moisture separator drain tank water level control valve 24 below,
Since a larger hydrostatic head can be given, it is more effective in preventing drain flushing. Further, in the drain cooler 30, not only the drain from the next-stage feed water heater 18 but also the drain generated in the moisture separator are cooled, so that the drain pump 29 can be supplied with a supercooled drain having a lower temperature.

FIG. 5 shows another embodiment. The difference from FIG. 9 is that first, a drain recovery tank 30 is installed in the drain pipe from the next-stage feed water heater 18 to install a moisture separation drain tank. The point is that the moisture separator drain from 23 is sent to the drain recovery tank 31 together with the drain from the next-stage feed water heater 18. Further, a drain cooler 30 using the feed water as a cooling medium is provided in the feed water pipe downstream of the steam generator feed water pump 17.
Is installed, the drain from the drain recovery tank 31 is sent to the drain cooler 30, and the steam generator feed water pump 1
The water is supplied to the drain pump 29 after being cooled (subcooled) by exchanging heat with the water supply on the downstream side.

FIG. 6 is a diagram showing the installation position of each device and the drain conduit in the embodiment of FIG. It should be noted that the moisture separator heater and the high-pressure feed water heater are generally installed on both sides of the turbine shaft, that is, in two series, but in FIG.
(Series) only. As shown in FIG. 6, the moisture separation heater 5 is installed on the building floor surface provided with the high-pressure turbine 3 and the low-pressure turbine 11, that is, the turbine operation floor surface, and the maximum pressure feed water heater 19 and the next stage feed water heating are installed. The container 18 is installed on the floor below the installation floor of the moisture separator / heater 5. The drain generated in the heaters 7 and 8 of the moisture separation heater 5 is the heater drain tank 25, which is located below the turbine operation floor.
After being temporarily stored at 26, both are sent to the maximum pressure feed water heater 19 through the heater drain tank water level control valves 27 and 28. The next-stage feed water heater 18 collects the drain from the highest-pressure feed water heater 19, and the drain from the next-stage feed water heater 18 is sent to the drain recovery tank 31 provided on the lower floor. The drain generated in the moisture separator 6 of the moisture separator / heater 5 is temporarily stored in the moisture separator drain tank 23 below the floor of the turbine operating floor, and then the drain disposed on the floor on which the drain recovery tank 31 is installed. It is sent to the drain recovery tank 31 through the water separator valve 24 of the separator / separator drain tank as well as the drain of the next-stage feed water heater. Furthermore, below the installation position of the drain recovery tank 31, a drain cooler 30 that is cooled by the water supply downstream of the steam generator water supply pump 17 is provided, and after the drain from the drain recovery tank 31 is sufficiently cooled (subcooled). It is configured to be supplied to the drain pump 29.

In this embodiment, the heater drain of the moisture separation heater, the moisture separator drain, the highest pressure feed water heater drain and the next stage feed water heater drain are smoothly transferred as follows to flush the drain. Drain can be supplied to the drain pump without generating

Since the turbine bleed air to the heater 7 is bleed from the upstream side paragraph of the high pressure turbine 3 than the turbine bleed air to the highest pressure feed water heater 19, the pressure of the drain of the heater 7 which is the condensation drain thereof is the maximum. It is higher than the pressure of the high-pressure feed water heater 19, and because the drain of the heater 8 is the main steam drain, the pressure is naturally higher than the pressure of the highest pressure feed water heater 19. Therefore, the drains of the heater drain tanks 25 and 26 are sent to the maximum pressure feed water heater 19 by utilizing this pressure difference. Similarly, the drain from the highest pressure feed water heater 19 can be transferred to the next stage feed water heater 18 without any problem due to the pressure difference. Due to the positional difference, the drain from the next-stage feed water heater 18 flows into the drain recovery tank 31 further installed on the floor below and is temporarily stored.

One of the features of this embodiment is that the drain of the moisture separator drain tank 23 is guided to the drain recovery tank 31. As described above, the pressure of the moisture separator drain is almost the same as the pressure of the next stage feed water heater 18, that is, the pressure of the drain recovery tank 31. However, in this embodiment, as shown in FIG. 6, the moisture separator drain tank 23 and the drain recovery tank 3 located below the floor of the turbine operation floor.
A sufficient positional difference is provided between the position 1 and the position 1 over the floor on which the next-stage feed water heater 18 is installed.

In general, the distance between floors is about 8 m in the building of a nuclear power plant, so in this embodiment there is about a gap between the drain water level of the moisture separator drain tank 23 and the drain water level of the drain recovery tank 31. A position difference of 13m can be secured. Therefore, the moisture separation drain tank water level control valve 2 provided in the drain pipe line at the inlet of the drain recovery tank 30
Since it is possible to give sufficient hydrostatic head to 4, there is no drain flush. Further, the water level control of the moisture separator drain tank 23 can be performed without any trouble by the moisture separator drain tank water level control valve 24.

Further, as a feature of this embodiment, the drain from the drain recovery tank 31 is cooled (subcooled) by the drain cooler 30 provided on the floor further below. Therefore, the drain discharged from the drain cooler 30 can be constantly maintained in a supercooled state in which the temperature is lower than the saturation temperature, so that the drain is stably transferred to the drain pump 29.

As described above, according to this embodiment, the drain generated in the moisture separator 6 can be smoothly transferred without flushing the drain in the moisture separator drain tank water level control valve 24. The water level of the moisture separator drain tank 23 can be controlled well. Further, since the drain from the drain recovery tank 31 is cooled by the drain cooler 30 to be a supercooled drain, the drain is not flushed in the drain pipe to the drain pump 29, and the next stage is caused by fluctuations in the load of the power plant. Even when the pressure inside the feed water heater 18 changes, the drain pump 29 is not damaged by the inclusion of air bubbles.

In the above embodiment, the drain from the highest pressure feed water heater 19 is fed to the next stage feed water heater 1 by the pressure difference.
Although it is configured to be collected in the drain recovery tank 31 after being sent to 8, the drain from the highest pressure feed water heater 19 and the next-stage feed water heater are generated as in the embodiment shown in FIGS. 7 and 8. The drain and the drain generated in the moisture separator 6 may be sent to the drain recovery tank 31. In the case of this embodiment, the drain from the maximum pressure feed water heater 19 can of course be recovered in the drain recovery tank 30 due to the pressure difference. Further, in this embodiment, since the next-stage feed water heater 18 does not need to receive the drain from the highest pressure feed water heater 19, the drain treatment amount in the next-stage feed water heater 18 is reduced and the next-stage feed water heater is reduced. The effect that 18 can be miniaturized also arises.

[0041]

As described above, according to the present invention, the drain generated in the heater of the moisture separation heater, the drain generated in the moisture separator, and the drain from the feed water heater are flushed with the drain. It is possible to smoothly transfer the drain pump to the drain pump without causing any trouble and to operate the drain pump safely, thereby providing a highly reliable drain recovery device.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of device installation positions of the embodiment shown in FIG.

FIG. 3 is a configuration diagram showing a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a device installation position of the embodiment shown in FIG.

FIG. 5 is a configuration diagram showing a third embodiment of the present invention.

FIG. 6 is an explanatory view of equipment installation positions of the embodiment shown in FIG.

FIG. 7 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram of a device installation position of the embodiment shown in FIG.

FIG. 9 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 1 Steam Generator 2 Main Steam Pipe 3 High Pressure Turbine 4 Low Temperature Reheat Steam Pipe 5 Moisture Separation Heater 6 Moisture Separator 7 Heater 8 Heater 9 Extractor Pipe 10 High Temperature Reheat Steam Pipe 11 Low Pressure Turbine 12 Condenser 13 Condensate Pump 14 Low Pressure Water Heater 15 Low Pressure Water Heater 16 Condensate Pipe 17 Steam Generator Water Pump 18 Next Stage Water Heater 19 Highest Pressure Water Heater 20 Water Pipe 21 Bleed Pipe 22 Bleed Pipe 23 Moisture Separator Drain Tank 24 Moisture separator Drain tank Water level control valve 25 Heater drain tank 26 Heater drain tank 27 Heater drain tank Water level control valve 28 Heater drain tank Water level control valve 29 Drain pump 30 Drain cooler 31 Drain recovery tank

Claims (6)

[Claims] 1. A drain generated in a moisture separation heater installed in a nuclear power plant is sent to a maximum pressure feed water heater or a next stage feed water heater, and the drain of the maximum pressure feed water heater or the next stage feed water heater. In a drain recovery device of a nuclear power plant, which is configured to pressurize the water with a drain pump and recover the water in a condensate pipe, the maximum pressure feed water heater and the next unit below the building floor surface in which the moisture separation heater is installed. A stage feed water heater is installed, and a drain cooler for cooling the drain from the next stage feed water heater is installed below the installation position of the next stage feed water heater. A drain recovery device for a nuclear power plant, further comprising a drain recovery tank installed below the drain cooler to store the drain from the drain cooler. 2. The drain from the heater of the moisture separation heater is supplied to the maximum pressure feed water heater, and the drain from the maximum pressure feed water heater is supplied to the next stage feed water heater, The drain recovery device for a nuclear power plant according to claim 1, wherein the drain from the moisture separator of the separation heater is supplied to the drain recovery tank. 3. The drain from the heater of the moisture separation heater is supplied to the highest pressure feed water heater, and the drain from the highest pressure feed water heater is supplied to the next stage feed water heater, The drain from the moisture separator of the minute separation heater is supplied to the drain cooler.
Drain recovery device for the nuclear power plant described. 4. The drain generated in the moisture separation heater installed in the nuclear power plant is sent to the highest pressure feed water heater or the next stage feed water heater, and the drain of the highest pressure feed water heater or the next stage feed water heater. In a drain recovery device of a nuclear power plant, which is configured to pressurize the water with a drain pump and recover the water in a condensate pipe, the maximum pressure feed water heater and the next unit below the building floor surface in which the moisture separation heater is installed. A stage feed water heater is installed, and a drain from the next stage feed water heater and a moisture separator of the moisture separation heater are provided below the installation position of the highest pressure feed water heater and the next stage feed water heater. A drain recovery tank for storing the drain of the drain recovery tank is installed, and a drain cooler for cooling the drain from the drain recovery tank is installed below the installation position of the drain recovery tank. A drain recovery device for a nuclear power plant. 5. The drain from the heater of the moisture separation heater is supplied to the maximum pressure feed water heater, and the drain from the maximum pressure feed water heater is supplied to the next stage feed water heater. The drain recovery device for a nuclear power plant according to claim 4, wherein 6. The drain from the heater of the moisture separation heater is supplied to the maximum pressure feed water heater, and the drain from the maximum pressure feed water heater is supplied to the drain recovery tank. The drain recovery device for a nuclear power plant according to claim 4.