JPS6035293A - Transfer facility for condensed water of nuclear power plant - 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] [Technical Field of the Invention] The present invention relates to a nuclear power plant condensate transfer facility, and in particular, it uses condensate stored in a condensate storage tank to generate power as make-up water, washing water, sealing water, etc. Concerning improvements to nuclear power plant condensate transfer equipment that transfers water to various equipment in the plant.

[Technical background of the invention and its problems]

Generally, a boiling water nuclear power plant is equipped with a condensate storage tank as turbine equipment, and this condensate storage tank is used to supply make-up water to various equipment in the power plant, as well as water supply to the high-pressure core spray system and reactor isolation cooling system. It is used as a water source. A condensate transfer facility is provided to transfer the condensate stored in the condensate storage tank to each Mi device of the power plant.

Figure 1 shows a conventional nuclear power plant condensate transfer facility.

FIG. 1 shows the state of the condensate storage tank 1 during normal plant operation. In other words, during normal operation of the plant, return water from the turbine equipment, reactor system, etc. flows into the condensate pipe 2.
The treated water is drained to the condensate storage tank 1 via the water pipe 3, and the treated water is treated at the radioactive waste treatment facility 8, which will be described later.
The condensate is guided to the condensate storage tank 1, where it is temporarily stored.

Next, the water stored in this ascites storage tank 1 is transferred by a transfer pump 4 and via a supply pipe 5 to various equipment of the plant as make-up water. Similarly, the condensate is supplied to the high pressure core spray system and the reactor isolation cooling system via the water supply pipe 6. This double water is used as make-up water, cleaning water, sealing water, etc. in various plant equipment, high-pressure core spray systems, reactor isolation cooling systems, etc., and the used return water is returned to condensate pipe 2 and discharge pipe 3. The condensate is guided to the condensate storage tank 1 and stored.

In addition, when supplying condensate from the condensate storage tank 1 via the supply pipe 5, when reducing the amount of supplied condensate, the operation of the transfer pump 5 is not stopped, but is constantly operated. A part of the water supply amount of condensate is returned to the condensate storage tank 1 through the small circulation pipe 7, and the water supply amount is appropriately controlled.

Figure 2 shows the radioactive waste treatment membrane (ila 8, ij4).
The structure is shown in the state during normal plant operation. The radioactive waste treatment facility 8 has a waste treatment device 9 that processes radioactive waste discharged from various types of solar tanks. Waste liquid system) Sample tank 10A.

10B. The selection is determined based on the water storage status of the two series of LCW sample tanks 10A and IOB. This LCW sample 10A, IOB
When the water quality of the water stored in the tank did not meet the specified values, the LCW sample cypress 10A was installed downstream of the IOB. l? The waste IIA and IIB are returned to the waste treatment device 9 via the return pipe 12 and reprocessed. On the other hand, if the quality of this stored water meets the specified value, it is drained via the drainage pipe 3 to the condensate storage tank 1 shown in FIG.

Therefore, during regular plant inspections, the inside of the condensate storage tank 1 is inspected or repaired. The reactor fell, equipment temporary storage pool, and main condenser hot well are all transferred to the reactor fer, equipment temporary storage pool, and main condenser hot well, and the inside of this condensate storage tank 1 is emptied. After this inspection or repair is completed, the condensate transferred to the reactor well, equipment temporary storage sol, and main condenser hot well is returned to the condensate storage tfH via the condensate pipe 2. In special cases, the condensate in the condensate storage tank 1 may be temporarily transferred to a cylindrical tank installed outdoors (not shown) during inspection or repair. It is being done.

However, the conventional nuclear power plant condensate transfer equipment configured as described above has the following problems.

In other words, when inspecting or repairing the condensate storage tank 1, it is necessary to completely cut off all drainage from the radioactive waste treatment equipment 8, the turbine equipment (not shown), and the reactor system to the condensate storage tank 1. Therefore, there was a problem in that the operation of the radioactive waste treatment equipment 8, turbine equipment (not shown), and nuclear reactor system was restricted.

In addition, when the condensate storage tank 1 is inspected or repaired, all of the condensate in the condensate storage tank 1 is transferred to another place and is completely empty, so its function as a water source in the plant is suspended during that time. Unable to supply condensate to various equipment in the plant,
There was a problem in that plant operations were restricted.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and even when inspecting or repairing a condensate storage tank, it is possible to discharge return water from nuclear reactor systems and turbine equipment such as radioactive waste treatment equipment, and The purpose of the present invention is to provide a nuclear power plant condensate transfer facility that can also supply water to various equipment in the plant and in which plant operation is not limited by inspection or repair of a condensate storage tank.

[Akari] Overview]

In order to achieve the above object, the nuclear power plant condensate transfer equipment according to the present invention is configured as follows.

A low-conductivity waste liquid sample tank temporarily stores treated water discharged from radioactive waste treatment equipment for water quality testing, and a sample tank for the treated water discharged from this sample tank and return water discharged from the necessary equipment. In a nuclear power plant condensate transfer facility having a condensate storage tank for storing condensate and a transfer pump for transferring the condensate stored in the condensate storage tank to the above-mentioned 751 necessary equipment, the return discharged from the above-mentioned necessary equipment is Transfer piping is configured to bypass the condensate storage tank and transfer water to the low conductivity waste liquid sample tank, and to supply the water stored in this sample tank to the transfer pump and the necessary equipment. It is configured by providing.

[From -〇Example]

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

FIG. 3 shows the entire 4th floor of an embodiment of the nuclear power plant <x water transfer equipment according to the present invention? A pedigree diagram showing the composition of the
The symbol added in the figure is a condensate storage tank. This condensate storage tank has an important role as a water source for the power generation plant.
A supply pipe 21°, a water supply pipe n, and a drainage pipe O are connected to the condensate storage unit 1, respectively. A transfer pump 24 is installed in the supply pipe 21 in the middle thereof, and the condensate in the condensate storage tank is transferred to various equipment of the plant, such as a control drive device (not shown). There is a small circulation pipe 24A in the middle of the supply pipe 21 on the discharge side of the transfer ponsis.
The other end of this small circulation pipe 24A is connected to the condensate storage tank 1 so that a part of the condensate transferred by the transfer pump is returned to the condensate storage tank 1. In addition, the amount of condensate transferred can be controlled as appropriate. The water supply pipe n is for supplying condensate from the condensate storage tank 1 to the high pressure core spray system and the reactor isolation cooling system. On the other hand, the discharge piping guides treated water discharged from the radioactive waste treatment equipment row to the condensate storage tank 1, and the radioactive waste treatment equipment row is equipped with a waste treatment device 5.

The waste treatment device 5 is for water treatment of radioactive drain discharged from various sump tanks (not shown) of the plant.
The treated water treated here is LCW (low conductivity waste liquid system).
The condensate is drained to the condensate storage tank via a drainage pipe connected to the plumbing station. In the middle of this LCW piping section, multiple rows of LCW (low conductivity waste liquid system) sample tanks 27A and 27B are installed in parallel, for example, as shown in FIG. 3. LCW? The sample tanks 27A and 27B are for temporarily storing treated water in order to check the water quality of the treated water treated by the waste treatment device 6.
Sample 4! Depending on the amount of water stored in Z7A or 27B, it is selected whether to drain the treated water to the other LCW sample tank 27A or 27B. And the LCW piping addition is these 2
The treated water inlet and outlet sides of the LCW Zansol tanks 27A and 27B in the series are branched into two, and the two branch pipes 26A and 26B on the outlet side are connected to LCW pumps 28A and 28B, respectively. The treated water is forcibly discharged. The tips of the two branch pipes 26A and 26B are connected to butt each other downstream of the LCW pumps 28A and 28B to form one LC.
It is connected to the W piping 213, and the tip of this LCW piping is connected to the discharge piping and connected to the condensate storage tank. On the other hand, a return pipe 4 is connected to the branch pipes 26A and 26B which are connected to each other. The tip of this return pipe 4 is connected to the inlet side of the waste treatment device 5, and if the treated water does not meet the specified value as a result of the water quality check, it is returned to the waste treatment device 5.
This treated water is then reprocessed. Therefore, only treated water that meets the specified water quality check values is discharged to the condensate storage tank.

Next, the transfer piping is configured so that the treated water flowing out of the LCW sample tanks 26A and 26B is bypassed without passing through the condensate storage tank 2o, and circulated between the transfer pump U and the LCW sample tanks 26A and 26B. Set up J. This transfer piping 30 consists of a discharge piping 31 that is piped to the discharge side of the transfer pump, and a suction pipe 32 that is piped to the suction side of the same. One end of the discharge pipe 31 is connected to the midway of the small circulation pipe 24A connected to the discharge side of the transfer pump Sae, and the other end is connected to the L located on the inlet side of the LCW sample pipes 27A and 28A.
Connected to CW piping A. Further, a condensate pipe O is connected to the discharge pipe 31 of B in the vicinity of the connection with the small circulation pipe 24A, and return water from, for example, a control salvage drive device (not shown) is guided to this condensate pipe O. It flows into the discharge pipe 31. On the other hand, two series of LCW sample tanks 27A
, 28A are connected to each other by a communication pipe 34, and a suction pipe 32 is connected to the middle of this communication pipe.

The other end of this suction pipe 32 is connected to the suction side of the transfer pump 21 of the supply pipe 21. As a result, together with the discharge piping 31, this transfer pump and the LCW sample tanks 27A and 28B
A closed loop is formed that circulates between

In addition, the symbols 40, 41, 42, 43,
44 and 45 are automatic on-off valves that are automatically opened and closed according to the operating status of the plant, and on-off valves 46 , 47 , 4
8 indicates the open state, and on-off valves 49, 50, 51
, 52 and 53 respectively indicate the valve closed state.

Next, the operation of this embodiment will be described.

Figure 3 shows the operating status during inspection or repair of the interior of the water storage tank, which is carried out during regular plant inspections, and the on-off valves 49, 50, 51, 52, and 53 of the condensate storage tank are fully closed. All water supply and drainage to the condensate storage tank has been stopped. When the inside of this condensate storage tank is inspected or repaired, all the condensate has already been transferred to other places, such as a reactor well (not shown) or a temporary equipment storage pool, and is empty.

Then, return water from turbine equipment, etc. (not shown) and L
The treated water discharged from the CW sample tanks 27A and 27B is divided into two lines of LCW sample tanks 27A and 27B by adding transfer piping.
You will be guided to 27B, where water will be stored. That is, water from a turbine facility (not shown) or the like flows into the discharge pipe 31 via the condensate pipe 33. The return water guided to the discharge piping 31 is forcibly transferred to the LCW piping section on the inlet side of the LCW sample tanks 27A, 27B by the transfer pump M, and flows into the LCW sample tanks 27A, 27B.

Further, the treated water discharged from the LCW sample tanks 27A and 27B is sent out to the suction side of the transfer pump through the communication pipe A and the suction pipe 32 in sequence, and the bale water storage tank is bypassed. The transfer pump Sae transfers this treated water to various equipment (not shown) of the plant via the supply piping 21. Therefore L.C.
W sample + = 27 A, 27 B The treated water discharged from each aI of the plant is not discharged to the condensate storage tank.
It can be transferred to an f% analyzer.

〔Effect of the invention〕

As explained above, the present invention allows the return water used in the required equipment of the plant to be transferred to the LCW (low conductivity waste liquid system) sample tank and drained without being discharged to the condensate storage tank. The tank was used as an ice field and planted to supply water to the above-mentioned required equipment. Therefore, even when inspecting or repairing the inside of the condensate storage tank, the above-mentioned necessary equipment can discharge the return water, and at the same time can receive makeup water, etc., which limits the plant operation. I never receive it. In addition, compared to the conventional system that transfers condensate from a condensate storage tank to a cylindrical tank installed outdoors, the entire system can be simplified, and the length of piping can be shortened, reducing construction costs. be able to. Furthermore, the treated water treated by the radioactive waste treatment system is distributed to each f11! Since it is used as a +a5 water supply, it has the effect of reducing surplus treated water released into the environment.

[Brief explanation of the drawing]

Figures 1 and 2 show the structure of conventional nuclear power plant rapid water transfer equipment. Figure 1 is a piping system diagram of a condensate storage tank, and Figure 2 is a piping system diagram of radioactive waste treatment equipment. figure,
FIG. 13 is a piping system diagram showing the operating state during inspection or repair of the inside of the condensate storage M tank according to an embodiment of the nuclear power plant post-water transfer equipment according to the present invention. A: Double water storage tank, 21: Supply piping, B: Water supply piping, O: Drainage piping, Sae: Transfer pump, 24
A... Small circulation piping, 5... Waste treatment equipment, Visit...
・LCW lightning distribution, 27A. 27B...LCW sample tank, 28A, 28B.
...LCW pump, 4..Return piping, 3..Transfer piping, 31..Discharge piping, 32..Suction piping,...
・Condensate piping, ah... communication pipe, 40, 41, 42
, 43 , 44 , 45 ... automatic opening/closing valve, 46 , 4
7. 48, 49, 50, 51, 52, 53...
Open/close valve. Applicant's agent Shizuo Hatano Figure 1 Figure 2 Figure 3 Figure 1

Claims (1)

[Claims] 19. A low conductivity waste liquid sample tank for temporarily storing treated water discharged from a radioactive waste treatment facility for water quality testing, and treated water discharged from this Sansol tank and necessary equipment. In a nuclear power generation zone condensate transfer facility having a condensate storage tank for storing return water discharged from the water storage tank and a transfer pump for transferring the condensate subsequently stored in the water storage tank to the above-mentioned required equipment, the above-mentioned The condensate storage unit detours the return water discharged from the required equipment and transfers it to the low conductivity waste liquid sample tank, and the water stored in this Sansol tank is transferred to the transfer pump. Zorant service water transfer equipment for nuclear power generation, characterized by having transfer piping for supplying water to required equipment. 2. The transfer piping includes a discharge pipe that connects the discharge side of the transfer pump and the inlet side of the low conductivity waste liquid sample tank, and a suction pipe that connects the outlet side of the sample tank and the suction side of the transfer pump. The nuclear power plant condensate transfer equipment according to claim 1, comprising: 3. The nuclear power plant condensate transfer equipment according to claim 1, wherein the transfer piping is equipped with an on-off valve and a check valve. 4. The nuclear power plant condensate transfer equipment according to claim 1, wherein the piping connected to supply and drain the condensate storage tank is equipped with a stop valve. 5. Claim 2, characterized in that the discharge pipe is connected to a condensate pipe that guides return water from required equipment.
Nuclear power plant condensate transfer equipment as described in paragraph.