JP2001324593A - Radioactive waste treatment system for boiling water type nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently separate, in particular, iron oxides, to eliminate a problem of circulation (clad recycle) of the iron oxides in a treatment system, and to allow favorable final disposal for a condensate filter back-washing water, paying attention to a mooted point in the disposal of the condensate filter back-washing water. SOLUTION: This radioactive waste treatment system has a means (for example, an incineratable disposable filter) for reducing a concentration of a substance contained in a supernatant liquid of the condensate filter back- washing water fed from a back-washed sludge separating tank to a low-electric- conductivity waste treatment system, in a system wherein the condensate filter back-washing water in the radioactive waste treatment system in a boiling water type nuclear power plant using, as a condensate filter a non-precoat type filter such as a hollow fiber membrane filter and a pleat filter is standing- treated in the back-washed sludge separating tank, and wherein the supernatant liquid of the standing-treated back-washing water is treated by the low-electric- conductivity waste treatment system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive waste liquid treatment system for a boiling water nuclear power plant (hereinafter sometimes abbreviated as a BWR power plant), and more particularly to a system for treating backwash water of a condensate filter. About.

[0002]

2. Description of the Related Art In a BWR power plant, various kinds of waste liquid generated in the power plant are processed by a radioactive waste liquid treatment facility in the power plant. Roughly, solid-liquid separation of waste liquid is performed, and solids are stored in drums as solid radioactive waste, or those with low radiation dose are incinerated by incineration facilities in power plants,
The incinerated ash is stored in a drum and stored in a condensate system after filtering and ion exchange, or released outside the system after confirming that there is no radioactivity.

[0003] Many BWR power plants are provided with a condensate filter in the condensate purification system, and the condensate filter is washed by periodic backwashing (hereinafter referred to as backwash water). Is generated, and this backwash water is also included in the various waste liquids described above.

In a condensate filter, a powder ion exchange resin is precoated on a filter element, a suspended substance mainly composed of iron oxide in the condensate is separated and concentrated in a precoat layer, and when a differential pressure rises, a backwash is performed. In addition, many equipments are used in which suspended substances mainly composed of iron oxide separated and concentrated from condensate are separated from the filter element and regenerated. The characteristics of this backwash water include suspended substances mainly composed of iron oxide separated and concentrated from condensate water, and powdered ion-exchange resin as a precoat material. The treatment is performed, and the relatively clear supernatant water is treated in a low electric conductivity waste liquid treatment system.

In recent years, a precoat material has been added to this condensate filter.
In particular, non-precoated filters such as hollow fiber membrane filters and pleated filters that do not use ion-exchange resin powder are applied. The characteristics of the backwash water of these non-precoated filters are that the fine particles that are unlikely to settle out are accurately captured by the filter, so that the iron oxide separated and concentrated from the condensate is several hundred mg / l. Included in concentration. In the waste liquid treatment facility, the filter backwash water is subjected to a process such as sedimentation by sedimentation, but fine iron oxide that does not easily sediment will be contained in the supernatant water after the static treatment in a relatively large amount. The supernatant water having a relatively high turbidity, that is, the supernatant water containing a relatively large amount of iron oxide solids in the condensate water, is treated by a low electric conductivity waste liquid treatment system.

[0006] Such a current condensate filter backwash water treatment system is configured, for example, as shown in FIG. In FIG. 7, 1 indicates a nuclear reactor in a BWR power plant, 2 indicates a turbine for power generation, 3 indicates a condenser, 4 indicates a condensate filter, 5 indicates a condensate desalination apparatus, and 6 indicates a heater.
The backwash water 7 of the condensate filter 4 is sent to a backwash sludge separation tank 8 and subjected to a stationary treatment, and the supernatant water is sent to a low electric conductivity waste liquid treatment system 9. The sludge separated in the backwash sludge separation tank 8 is stored in the backwash sludge storage tank 1.
And then packed in a drum 13 via a drying means 11, an incineration means 12 and the like.

In the low electric conductivity waste liquid treatment system 9, various low electric conductivity waste liquids 14 are sent to the low electric conductivity waste liquid collecting tank 15 together with the supernatant water of the condensate filter backwash water that has been subjected to the stationary treatment. The condensate is passed through a low-conductivity waste liquid filter 16 and a low-conductivity waste liquid desalination device 17 filled with an ion exchange resin.
8 to be collected. Condensate storage tank 18
The recovered condensate stored in the condenser is supplied to a condensate system, for example, a condenser 3 as necessary. When the differential pressure rises, the low electric conductivity waste liquid filter 16 is backwashed, and the backwash water is sent to, for example, the backwash sludge storage tank 10, and only the supernatant water is collected in the low electric conductivity waste liquid collection tank 15. It is supposed to be.

In the BWR power plant, in addition to the low-conductivity waste liquid treatment system 9, various high-conductivity waste liquids 20 such as various chemical waste liquids, waste liquids for washing work clothes and the like, and equipment cleaning waste liquids.
A high electric conductivity waste liquid treatment system 19 for treating the wastewater is provided. The various high-conductivity waste liquids 20 are concentrated in the concentrator 21 and are divided into those discharged to the outside 22 according to the radiation dose and those stored in the concentrated waste liquid storage tank 23. The concentrated waste liquid stored in the concentrated waste liquid storage tank 23 is packed in a drum 26 via a drying unit 24, a plastic solidifying unit 25, and the like.

[0009]

In the above-mentioned condensate filter backwash water treatment system in the radioactive liquid waste treatment system, when the above-mentioned non-precoat type condensate filter is used, fine contaminants, particularly iron oxide solids, are contained. Waste liquid with a large amount of waste is processed by the low-conductivity waste liquid filter of the low-conductivity waste liquid treatment system. As a result, the number of washing and backwashing operations for recovering the differential pressure of the filter is increased. As the number of backwashing increases, the amount of backwashing water increases, and the load on the downstream of the waste liquid treatment system increases. Even if the backwash water of the low-conductivity waste liquid filter is settled in the same way as the backwash water treatment of the condensate filter, and the supernatant water is treated, the supernatant water still contains poorly sedimentable iron oxide derived from the condensate filter backwash water. When the supernatant water of the backwash water of the low-conductivity waste liquid filter is returned to the low-conductivity waste liquid collection tank 15, which is the pre-stage tank, the iron oxide component having poor sedimentation has a low electric conductivity. It circulates in the waste liquid treatment system (cladding recycling), and eventually not only is not disposed of, but also may be concentrated in the system. If the condensed water is concentrated, the low-conductivity waste liquid treatment system cannot perform desired treatment, or the quality of the recovered condensate stored in the condensate storage tank 18 deteriorates. It becomes difficult.

An object of the present invention is to focus on the above-mentioned problems in the treatment of the condensate filter backwash water, and particularly to efficiently separate the iron oxide and to reduce the iron oxide circulation (cladding recycling) in the treatment system. SUMMARY OF THE INVENTION It is an object of the present invention to solve the problem and enable a desired final disposal of the condensate filter backwash water.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides roughly three systems. In the first system, the concentration of a substance contained in the supernatant water of the condensate filter backwash water sent to the low electric conductivity waste liquid treatment system, particularly the concentration of iron oxide, is reduced. The second system is designed to prevent clad recycling, particularly in the treatment of low-conductivity waste liquid filter backwash water. The third system treats the supernatant water of the condensate filter backwash water using a separate system instead of the low-conductivity waste liquid treatment system, and basically causes problems in the low-conductivity waste liquid treatment system. It was made not to let them.

That is, the radioactive waste liquid treatment system for a boiling water nuclear power plant according to the present invention uses a non-precoated filter such as a hollow fiber membrane filter or a pleated filter as a condensate filter. In the radioactive waste liquid treatment system, the backwash water of the condensate filter is left standing in the backwash sludge separation tank, and the stationary backwash water supernatant water is treated in the low electric conductivity waste liquid treatment system. And a means for reducing the concentration of a substance contained in the supernatant water of the condensate filter backwash water sent from the backwash sludge separation tank to the low-conductivity wastewater treatment system ( First system).

The first system can be broadly divided into two other systems. In other words, the system for reducing the contained substance concentration comprises a system comprising a disposable filter capable of being incinerated disposed in a liquid feed line from the backwash sludge separation tank to the low electric conductivity waste liquid treatment system. The means is a system comprising drug adding means for adding a drug capable of increasing the electric conductivity of the supernatant water in the backwash sludge separation tank to 10 μS / cm or more.

[0014] In the first system as described above, before the condensate filter backwash water sent to the low electric conductivity waste liquid treatment system from the supernatant water to the low electric conductivity waste liquid treatment system,
Contained substances, especially fine iron oxides with poor sedimentation, are removed, reducing the frequency of regeneration of low-conductivity waste liquid filters and greatly reducing the problem of cladding recycling in low-conductivity waste liquid backwash water treatment. Is done.

Further, the radioactive waste water treatment system for a boiling water nuclear power plant according to the present invention uses a non-precoated filter such as a hollow fiber membrane filter or a pleated filter as a condensate filter. In the radioactive waste liquid treatment system, the backwash water of the condensate filter is allowed to stand still in the backwash sludge separation tank, and the supernatant water of the backwash water that has been left standing is subjected to a low-conductivity wastewater filter having at least a low conductivity wastewater filter. In the system for treating with the electric conductivity waste liquid treatment system, in the treatment of the backwash water of the low electric conductivity waste liquid filter,
A second embodiment is provided with a low-conductivity waste liquid filter for preventing backwash water from concentrating due to an increase in the number of backwash times (second system).

In the second system, the low-conductivity waste liquid filter backwash water concentration preventing means sends all the backwash water of the low-conductivity waste liquid filter to the high-conductivity waste liquid treatment system. Or a system having a high electric conductivity waste liquid treatment system concentrator for concentrating the entire amount of the backwash water sent, or the low electric conductivity waste liquid filter backwash water concentration. A line for sending backwash water of the low-conductivity waste liquid filter to a backwash sludge storage tank that stores backwash sludge that has been left standing in the backwash sludge separation tank; And a line for feeding the supernatant water of the sludge storage tank to the high-conductivity waste liquid treatment system.

[0017] In the second system, since the circulation system of the supernatant water of the backwash water in the treatment of the low-conductivity waste liquid backwash water is substantially eliminated, the problem of the clad recycling is substantially completely eliminated. Disappear.

Further, the radioactive waste liquid treatment system for a boiling water nuclear power plant according to the present invention uses a non-precoat type filter such as a hollow fiber membrane filter or a pleated filter as a condensate filter. In the system for treating the backwash water of the condensate filter in the backwash sludge separation tank in the radioactive wastewater treatment system of the above, the supernatant water of the condensate filter backwash water that has been subjected to the standstill treatment is treated with a high electrical conductivity wastewater treatment system. (Third system).

In the third system, the low-conductivity waste liquid treatment system is not basically used for treating the supernatant water of the condensate filter backwash water. No problems occur with the electrical conductivity waste liquid treatment system.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 6 shown below, only parts different from the conventional system shown in FIG. 7 will be described, and the same parts as those in the conventional system will be described by assigning the same reference numerals as those shown in FIG. Is omitted.

FIG. 1 shows a BW according to a first embodiment of the present invention.
1 shows a radioactive waste liquid treatment system of an R power plant. FIG.
In the system shown in FIG.
From the backwash sludge separation tank 8 as a means to reduce the concentration of substances contained in the supernatant water of the condensate backwash water, particularly iron oxide, sent to the wastewater treatment system 9 A disposable filter 32 that can be incinerated is disposed in a liquid sending line 31 to the waste liquid treatment system 9. The type of the filter 32 is not particularly limited, as long as it can sufficiently filter fine iron oxide in the supernatant water of the condensate filter backwash water. The used filter 32 may be incinerated in an incineration facility in a power plant, and incineration ash may be packed in a drum for final disposal.

In such a system, the disposable filter 32 which can be incinerated is used to separate and remove iron oxide having a poor sedimentation before being treated by the low electric conductivity waste liquid filter 16 of the low electric conductivity waste liquid treatment system 9. Therefore, the frequency of regeneration of the waste filter 16 having a low electrical conductivity is greatly reduced.

Also, when backwashing the low-conductivity waste liquid filter 16, the amount of poorly sedimentable iron oxide in the backwash water is greatly reduced. When the liquid is sent to the storage tank 10 and the supernatant water is circulated to the low electric conductivity waste liquid collecting tank 15, the occurrence of the problem of clad recycling is prevented or at least greatly reduced.

Therefore, the disposable filter 3
2 is incineration disposal, incineration ash is subjected to drum packing disposal, and the condensate filter backwash water that has been efficiently purified is stored in the condensate storage tank 18 of the low electric conductivity waste liquid treatment system 9 with good water quality. This allows for the desired final disposal of the condensate filter backwash water.

FIG. 2 shows a BW according to a second embodiment of the present invention.
1 shows a radioactive waste liquid treatment system of an R power plant. FIG.
In the system shown in FIG.
Drug adding means 41 for adding and introducing a drug capable of making the electric conductivity of the supernatant water in the sample at 10 μS / cm or more
Is provided. In the embodiment shown in FIG. 2, the backwashing sludge separation tank 8 is constituted by the drug adding means 41 for directly adding and adding a drug to the backwashing sludge separation tank 8.
(For example, a backwash water receiving tank (not shown) for temporarily receiving backwash water is provided at a position indicated by reference numeral 7 in FIG. 2). The medicine to be added may be a particular inorganic compound, for example, NaOH or Na ₂ S.
O ₄ , NaHCO ₃ , Na ₂ CO _{3 and the} like can be used.

In such a system, the supernatant water of the backwash sludge separation tank 8 sent to the low electric conductivity waste liquid treatment system 9 is sent to the low electric conductivity waste liquid treatment system 9 before being sent to the low electric conductivity waste liquid treatment system 9. The added chemicals, in particular, significantly reduce the iron oxide concentration. Therefore, the low electric conductivity waste liquid treatment system 9
Iron oxide having poor sedimentation is separated and removed in advance before the treatment with the low electric conductivity waste liquid filter 16, and the frequency of regeneration of the low electric conductivity waste liquid filter 16 is greatly reduced. The problem of clad recycling in the backwash water treatment of the waste liquid filter 16 is also prevented or greatly reduced. As a result, the desired final disposal of the condensate filter backwash water is possible.

In the above system, there is a correlation between the addition of an inorganic compound as a drug and the degree of reduction in the concentration of iron oxide in the supernatant water due to the addition. The electrical conductivity of the supernatant water can be used as a measure.

The following experiment was conducted to verify this.
Was. Same as backwash water of conventional pre-coat type condensate filter
Next, the hollow fiber membrane type or pure
Add polymer flocculant to backwash water
However, no significant decrease in the iron concentration in the supernatant was observed. Therefore,
Add inorganic compound to backwash water of pleated condensate filter
The iron concentration in the supernatant when the electrical conductivity is increased.
It was confirmed. Sampling in the condensate filter backwash water receiving tank
Mineral water against the backwash water of the pleated condensate filter
Compound NaOH, Na_TwoSO_Four, NaHCO _ThreeThree types
To change the electric conductivity of the backwash water and leave it to stand for 24 hours
The subsequent change in iron concentration in the supernatant was investigated. Each compound in backwash water
Addition amount when added, electric conductivity of backwash water, iron concentration of supernatant water
The degrees are shown in Tables 1 to 3. In addition, supernatant water conductivity and supernatant water
FIG. 3 shows the relationship between the iron concentrations. Similarly, with inorganic compounds
And Na_TwoCO_ThreeAmount when adding water, backwash water electricity
Table 4 shows the conductivity and the iron concentration of the supernatant water.

[0029]

[Table 1]

[0030]

[Table 2]

[0031]

[Table 3]

[0032]

[Table 4]

As is apparent from FIG. 3, it is possible to reduce the iron concentration of the supernatant water to 20 mg / l or less by setting the electric conductivity of the supernatant water to 10 μS / cm or more.

When no inorganic compound is added to the backwash water, the supernatant water has an electric conductivity of 0.5 μS / cm and an iron concentration of 15 μS / cm.
It was 0 mg / l. A decrease in iron concentration was clearly confirmed with an increase in the electrical conductivity of the supernatant water. When the electric conductivity of the supernatant water is 10 μS / cm or more, particularly 14 μS / cm
At the time described above, the iron concentration in the supernatant was more reliably reduced to 20 mg / l or less. In order to increase the electric conductivity of the supernatant water to 14 μS / cm or more, the amount of each compound is different. NaO
When H is used, it may be added at a rate of 5 to 10 mg / l or more based on the backwash water. If you using Na ₂ SO _4, may be added at a rate of more than 10 to 15 mg / l against backwash water. When NaHCO ₃ is used, it may be added at a rate of 20 to 25 mg / l or more based on the backwash water. When using Na ₂ CO ₃ , 5 to 5
It may be added at a rate of 10 mg / l or more.

FIG. 4 shows a BW according to a third embodiment of the present invention.
1 shows a radioactive waste liquid treatment system of an R power plant. FIG.
In the system shown in (1), as a means for preventing the concentration of the backwash water accompanying the increase in the number of backwashing in the treatment of the backwash water of the low electric conductivity waste liquid filter 16, the supernatant water of the low electric conductivity waste liquid filter 16 is used. No line is provided for feeding backwash sludge storage tank 10, but line 51 is provided for sending the entire amount of low-conductivity waste liquid backwash water to concentrator 21 of high-conductivity wastewater treatment system 19. ing. In the concentrator 21, the whole amount of the backwash water sent is concentrated, solid-liquid separation is performed, and the same processing as that for the waste liquid with high electrical conductivity is performed. Therefore, problems associated with the low-conductivity waste liquid filter backwash water treatment, particularly the problem of clad recycling, are eliminated, and desirable final disposal of the condensate filter backwash water is made possible.

FIG. 5 shows a BW according to a fourth embodiment of the present invention.
1 shows a radioactive waste liquid treatment system of an R power plant. FIG.
In the system shown in FIG. 1, the backwash water of the low-conductivity waste liquid filter 16 is sent to the backwash sludge storage tank 10, but the supernatant water of the backwash sludge storage tank 10 is supplied to the low-conductivity waste liquid collection tank 15. Is not circulated to the concentrator 21 of the high electric conductivity waste liquid treatment system 19 through the line 61.
Liquid. The solid-liquid separation is performed in the concentrator 21, and the same processing as that for the high-conductivity waste liquid is performed. Therefore, problems associated with the low-conductivity waste liquid filter backwash water treatment, particularly the problem of clad recycling, are eliminated, and desirable final disposal of the condensate filter backwash water is made possible.

FIG. 6 shows a BW according to a fifth embodiment of the present invention.
1 shows a radioactive waste liquid treatment system of an R power plant. FIG.
In the system shown in FIG.
The supernatant water of the condensate filter backwash water is not sent to the low electric conductivity waste liquid treatment system 9 but is sent directly to the concentrator 21 of the high electric conductivity waste liquid treatment system 19 via the line 71. You.
The solid-liquid separation is performed in the concentrator 21, and the same processing as that for the high-conductivity waste liquid is performed. In this system, the low-conductivity waste liquid treatment system 9 is basically not used for the treatment of the condensate filter backwash water. The problem of regeneration frequency of No. 16 and the problem of clad recycling in the backwash water treatment do not occur. Therefore, it is possible to perform desired final disposal of the condensate filter backwash water without causing any problem.

[0038]

As described above, according to the radioactive waste liquid treatment system for a boiling water nuclear power plant of the present invention, even if a non-precoat type condensate filter is used, the condensate filter backwash water can be treated. In particular, the iron oxide can be efficiently separated, and the problem of iron oxide circulation (cladding recycling) in the treatment system can be solved, and a desired final disposal of the condensate filter backwash water can be performed.

[Brief description of the drawings]

FIG. 1 is an equipment system diagram of a radioactive waste liquid treatment system of a boiling water nuclear power plant according to a first embodiment of the present invention.

FIG. 2 is an equipment system diagram of a radioactive liquid waste treatment system of a boiling water nuclear power plant according to a second embodiment of the present invention.

FIG. 3 is a diagram showing the relationship between supernatant water electrical conductivity and iron concentration, showing the results of tests performed to confirm the operation and effect in the system of FIG. 2;

FIG. 4 is an equipment system diagram of a radioactive liquid waste treatment system of a boiling water nuclear power plant according to a third embodiment of the present invention.

FIG. 5 is an equipment system diagram of a radioactive liquid waste treatment system of a boiling water nuclear power plant according to a fourth embodiment of the present invention.

FIG. 6 is an equipment system diagram of a radioactive liquid waste treatment system of a boiling water nuclear power plant according to a fifth embodiment of the present invention.

FIG. 7 is a system diagram of a conventional radioactive waste liquid treatment system of a boiling water nuclear power plant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Nuclear reactor 2 Turbine 3 Condenser 4 Condensate filter 5 Condensate desalination device 6 Heater 7 Condensate filter backwash water 8 Backwash sludge separation tank 9 Low electric conductivity waste liquid treatment system 10 Backwash sludge storage tank 11 Drying Means 12 Incineration means 13 Drum 14 Various low-conductivity waste liquids 15 Low-conductivity waste liquid collection tank 16 Low-conductivity waste liquid filter 17 Low-conductivity waste liquid desalination device 18 Condensate storage tank 19 High-conductivity waste liquid treatment system Reference Signs List 20 Various high-conductivity waste liquid 21 Concentrator 22 Outside system 23 Concentrated waste liquid storage tank 24 Drying means 25 Plastic solidification means 26 Drum 31 Liquid sending line from backwash sludge separation tank to low-conductivity waste liquid treatment system 32 Disposable filter 41 Drug adding means 51, 61, 71 Liquid sending line to concentrator

Claims (7)

[Claims] 1. A backwash water of a condensate filter in a radioactive waste liquid treatment system of a boiling water nuclear power plant using a non-precoated filter such as a hollow fiber membrane filter or a pleated filter as a condensate filter. In a system in which the standing water in the backwash water treated in the sludge separation tank is treated in the low electric conductivity waste liquid treatment system, the supernatant water is sent from the backwash sludge separation tank to the low electric conductivity waste liquid treatment system. A radioactive waste liquid treatment system for a boiling water nuclear power plant, comprising means for reducing the concentration of a substance contained in the supernatant water of a condensate filter backwash water to be liquefied. 2. The incineration disposable filter provided in a liquid sending line from the backwash sludge separation tank to a low electric conductivity waste liquid treatment system, wherein the contained substance concentration reducing means is provided. Radioactive waste liquid treatment system for boiling water nuclear power plants. 3. The content-concentration reducing means reduces the electric conductivity of the supernatant water in the backwash sludge separation tank by 10%.
2. The radioactive waste liquid treatment system for a boiling water nuclear power plant according to claim 1, further comprising a drug adding means for adding a drug capable of increasing the pressure to μS / cm or more. 4. A backwashing water of a condensate filter in a radioactive waste liquid treatment system of a boiling water nuclear power plant using a non-precoated filter such as a hollow fiber membrane filter or a pleated filter as a condensate filter. The system for treating the supernatant water of the backwashing water subjected to standing treatment in a sludge separation tank and treated at least with a low electric conductivity waste liquid treatment system having a low electric conductivity waste liquid filter, wherein the low electric conductivity In the treatment of the backwash water in the waste water filter, a boiling water nuclear power plant is provided with a low-conductivity waste liquid filter backwash water concentration prevention means for preventing the backwash water concentration due to an increase in the number of backwash times. Radioactive liquid waste treatment system for power plants. 5. A line for feeding the low-conductivity waste liquid filter backwash water concentration preventing means to the entire low-conductivity waste liquid filter backwash water to a high-conductivity waste liquid treatment system;
The radioactive waste liquid treatment system for a boiling water nuclear power plant according to claim 4, comprising a concentrator of a high electric conductivity waste liquid treatment system for concentrating the whole amount of the backwash water sent. 6. The low-conductivity waste liquid filter backwash water concentration prevention means stores the backwash water of the low-conductivity waste liquid filter in the backwash sludge separated in the backwash sludge separation tank. 5. The boiling water nuclear power plant according to claim 4, comprising: a line for sending a liquid to the backwashing sludge storage tank, and a line for sending the supernatant water of the backwashing sludge storage tank to the wastewater treatment system having high electrical conductivity. Radioactive liquid waste treatment system for power plants. 7. Backwashing water of a condensate filter in a radioactive waste liquid treatment system of a boiling water nuclear power plant using a non-precoated filter such as a hollow fiber membrane filter or a pleated filter as a condensate filter. A boiling water type, wherein a line for sending the supernatant water of the condensed water condensate filter backwash water to a high electric conductivity waste liquid treatment system is provided in a system for standing treatment in a sludge separation tank. Nuclear power plant radioactive waste liquid treatment system.