JPH09257992A - Nuclear power plant and hydrogen peroxide decomposing device, and inspection work method of nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time for periodical inspection of nuclear reactor and various works in the reactor and prevent the performance of resin washing the water in the reactor form decreasing. SOLUTION: This plant is provided with a pressure vessel with nuclear fuel in a core, a nuclear reactor well 1, a condensate storing tank 2 storing condensate and a condensate purifier 3 and is formed such that nuclear reactor water is filled in the well 1 at the time of stop of nuclear reactor and after the completion of a specified inspection work the water is brought into the tank 2. In the tank 2, a hydrogen peroxide decomposition device 4 is set to decompose hydrogen peroxide in the water in the tank 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nuclear power plant and an inspection work method for a nuclear power plant.

[0002]

2. Description of the Related Art A boiling water reactor (hereinafter referred to as "BWR") is one of the generally used power generating nuclear reactors. In this boiling water reactor plant, as shown in FIG. 2, a pressure vessel 6 equipped with a nuclear fuel in a core 5 and a turbine 7 driven by steam generated in this pressure vessel
And a system for returning the exhaust steam from the turbine to the pressure vessel, that is, a condenser 8 for condensing the exhaust steam, a condensate purifier 3, a water supply pump 9, and a heat exchanger 10, and the condensate purifier 3
A condensate storage tank 2 is connected to.

In the condensate purifier 3, resin or the like is used to remove corrosion products such as iron contained in the cooling water. However, when the removal efficiency is lowered, the resin is washed. For this cleaning, physical cleaning using water or chemical cleaning using chemicals is generally adopted. In any case, since a large amount of water is used to wash this resin,
Normally, the reactor water in the condensate storage tank 2 is used.

[0004] As the reactor water that is brought into the condensate storage tank 2, there is water that is brought into the reactor during periodic inspections. That is, at the time of periodic inspection of the nuclear reactor, for example, fuel water is stored in the reactor well 1 for the purpose of fuel exchange, and the reactor water is drained after completion of various inspections. An outline of a path until the water taken out is brought into the condensate storage tank 2 is shown in FIG.

Usually, the reactor water is passed directly to the radioactive waste treatment system 12, or the suppression pool 11 is used.
It is once dropped into the condensate storage tank 2 through the radioactive waste treatment system 12. If this route is taken, the hydrogen peroxide generated during the reactor operation will be the radioactive waste treatment system 1
Since it is decomposed by 2, the hydrogen peroxide concentration of the stored water in the condensate storage tank 2 becomes small, and hydrogen peroxide does not pose a problem.

[0006]

As described above, the hydrogen peroxide concentration of stored water does not pose a problem at the time of normal regular inspection, but the purpose is to shorten the time for regular inspection. As a result, the reactor water may be directly brought into the condensate storage tank 2. In this case, the hydrogen peroxide concentration of the stored water becomes high, and if the resin of the condensate purifier is washed using this stored water, the performance of the resin may be deteriorated by the hydrogen peroxide.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a nuclear power plant and a method of operating a nuclear power plant capable of shortening the time for periodical inspection and without fear of deterioration of resin performance. To provide.

[0008]

That is, the present invention comprises a pressure vessel equipped with a nuclear fuel core, a reactor well provided in the reactor, and a condensate storage tank for storing condensate. At the time of inspection work, in the nuclear power plant configured such that the reactor well is filled with reactor water and the reactor water is brought into the condensate storage tank after a predetermined work, A hydrogen peroxide decomposing device for decomposing hydrogen peroxide contained in the water in the tank, and directly bringing the reactor water into the condensate storage tank when bringing the reactor water in the reactor well into the condensate storage tank. The reactor is brought into a water storage tank, and then the reactor water in the condensate storage tank is decomposed into hydrogen peroxide by the hydrogen peroxide decomposition apparatus to achieve the intended purpose.

Further, a hydrogen peroxide decomposing device for decomposing hydrogen peroxide is provided in the reactor water discharge system of the condensate storage tank, and the reactor water is discharged when the reactor water in the reactor well is discharged. The water is brought directly into the condensate storage tank, and the reactor water is decomposed into hydrogen peroxide by a hydrogen peroxide decomposing device provided in the reactor water discharge system of the condensate storage tank.

Further, in this case, the hydrogen peroxide decomposition device is formed so as to be detachable and movable. Further, a catalyst carrying a metal catalyst for hydrogen peroxide decomposition reaction is used in this hydrogen peroxide decomposition apparatus. Further, a catalyst in which at least one of Pt, Ru, Rd, and Pd is supported on alumina or silica is used in the hydrogen peroxide decomposition apparatus.

That is, in the nuclear power plant constructed in this way, when the reactor water in the reactor well is brought into the condensate storage tank after various inspections, the reactor water is directly brought into the condensate storage tank. Therefore, the time required for extracting the reactor water is shortened, and even if the resin of the condensate purifier is washed using the stored water of this condensate storage tank, Since a hydrogen peroxide decomposing device is installed in the pipe connecting the condensate purifier, the hydrogen peroxide decomposing device decomposes the hydrogen peroxide in the stored water and lowers the hydrogen peroxide concentration in the stored water. Therefore, it is possible to reduce the time required for the periodic inspection, and it is possible to sufficiently prevent the deterioration of the performance of the resin due to hydrogen peroxide.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows the main part of the reactor water discharge (circulation) system of the nuclear power plant. Reference numeral 1 is a reactor well, and during the reactor inspection work, the reactor water is filled in the reactor well, and after performing a predetermined inspection or work, the reactor water is brought into the condensate storage tank 2. Is formed. In addition, 3 is a condensate purifier and 4 is a hydrogen peroxide decomposition apparatus.

As described above, the condensate storage tank 2 is provided with a hydrogen peroxide decomposing device for decomposing hydrogen peroxide contained in the tank water, and the reactor water in the reactor well is installed. When bringing it into the condensate storage tank, the reactor water is directly brought into this condensate storage tank, and thereafter, the carried-in reactor water is subjected to hydrogen peroxide decomposition treatment.

In this way, the hydrogen peroxide contained in the stored water in the condensate storage tank 2 is decomposed by the hydrogen peroxide decomposing device, and the hydrogen peroxide concentration of the stored water can be sufficiently reduced.
Even if the resin of the condensate purifier 3 is washed with stored water, the performance of the resin does not deteriorate due to hydrogen peroxide.

FIG. 5 shows a second embodiment of installation of the hydrogen peroxide decomposing device 4 for stored water in the condensate storage tank 2 of the present invention. That is, it has a configuration in which the hydrogen peroxide decomposition device 4 is connected to a pipe (flow passage) A that connects the condensate storage tank 2 and the condensate purifier 3. According to this configuration, the hydrogen peroxide concentration in the stored water can be sufficiently reduced by decomposing the hydrogen peroxide contained in the stored water brought into the condensate purifier 3 by the hydrogen peroxide decomposing device 4, so that it can be directly brought into the storage tank. Even if the resin of the condensate purifier 3 is washed with the stored water stored therein, the performance of the resin is not deteriorated by hydrogen peroxide. Further, according to this configuration, only a required amount of stored water is passed through the hydrogen peroxide decomposition device 4, so that the amount of water passing can be reduced. Furthermore, this allows the catalyst to be used efficiently.

FIG. 6 shows a fourth embodiment of installation of the hydrogen peroxide decomposing device 4 for stored water in the condensate storage tank 2 of the present invention. This figure has a configuration in which the condensate storage tank 2 is connected to the upstream side of the hydrogen peroxide decomposition apparatus 4, and the condensate purifier 2 and the condensate storage tank 2 are connected to the downstream side of the hydrogen peroxide decomposition apparatus 4. .
According to this configuration, while the hydrogen peroxide of the stored water in the condensate storage tank 2 is decomposed, when the hydrogen peroxide concentration of the stored water in the condensate storage tank is not below a certain value, the condensate purifier 2 When it is necessary to wash the resin, the stored water can be sent directly to the condensate purifier 2 through the hydrogen peroxide decomposition device 4. With this configuration, stored water having a low hydrogen peroxide concentration can be sent to the condensate purifier 2, so that even if the resin of the condensate purifier 3 is washed with the stored water, the performance of the resin is deteriorated by hydrogen peroxide. Does not cause

The hydrogen peroxide decomposing device 4 shown in the above embodiment may be permanently installed or may be detachable and movable. If it is a mobile device, it can be reused in a nuclear power plant with multiple reactors.

Next, an example of the hydrogen peroxide decomposition apparatus will be described with reference to FIGS. 7 to 13. FIG. 7 shows a first example of the hydrogen peroxide decomposition apparatus. This figure has a structure in which a pump 101 and a catalyst packed tower 102, which is filled so as not to come out of the pipe even when water is passed through the pipe, are connected by a pipe. The order of the pump 101 and the catalyst packed column 102 may be reversed. Examples of the catalyst include alkali, powdered platinum, palladium, manganese dioxide, and fine powder (for example, glass fragments). The stored water in the condensate storage tank 2 is forcibly forced by the pump 101 into the catalyst packed tower 1
Since hydrogen peroxide can be forcibly decomposed by passing through 02, the hydrogen peroxide concentration of the stored water in the condensate storage tank 2 can be reduced.

A second example of the hydrogen peroxide decomposition apparatus is shown in FIG. FIG. 8 has a configuration in which a heater 103 capable of heating water passing through is connected to a pipe connecting the pump 101 and the catalyst packed tower 102 of FIG. The heater 103 may be located upstream of the catalyst packed tower. A heater may be attached to the catalyst packed tower 102 itself. With this configuration, by raising the temperature of the stored water passing through the catalyst, the catalyst can be activated (see FIG. 15), so that hydrogen peroxide can be more forcibly decomposed, and therefore the stored water in the condensate storage tank 2 can be decomposed. The hydrogen peroxide concentration can be reduced.

A third example of the hydrogen peroxide decomposition apparatus is shown in FIG. This drawing has a configuration in which a stainless steel mesh pipe 104 in which a stainless steel mesh is attached in a direction perpendicular to the longitudinal direction is connected to a pipe connecting the pump 101 and the heater 103. Since hydrogen peroxide is easily decomposed by coming into contact with a rough solid surface, the hydrogen peroxide can be forcibly decomposed by forcibly passing the stainless mesh pipe by the pump 101 through the stored water in the condensate storage tank 2. Therefore, the hydrogen peroxide concentration of the stored water in the condensate storage tank 2 can be reduced.

FIG. 10 shows a fourth example of the hydrogen peroxide decomposition apparatus. This figure has a structure in which a catalyst-filled container 106, which is placed in a container through which water can pass through the catalyst, is connected to a stirring device 105 that can forcibly circulate water inside the container and water outside the container. It is installed in the condensate storage tank 2, and the stirring device 105 forcibly circulates the stored water inside and outside the catalyst-filled container 106 to decompose hydrogen peroxide contained in the stored water in the condensate storage tank 2. The hydrogen oxide concentration can be reduced.

FIG. 11 shows a fifth example of the hydrogen peroxide decomposition apparatus. In FIG. 11, the hydrogen peroxide concentration measuring means 107 is connected by a pipe after the catalyst packed tower 102 in FIG. 8, and the flow destination of the water passing liquid is determined manually or automatically on the downstream side of the hydrogen peroxide concentration measuring means 107. A branch valve 108 capable of being connected is connected, and one of the downstream side of the branch valve 108 is connected to the hydrogen peroxide concentration measuring means 107 and the upstream side of the pump 101 to a pipe. According to this configuration, it can be confirmed whether the hydrogen peroxide concentration of the stored water leaving the catalyst packed tower 102 is sufficiently low, and if it is not sufficiently lower, the branch valve 108
Since the flow destination of the water-passing liquid can be returned to the upstream side of the catalyst packed column 102, the hydrogen peroxide concentration can be reliably reduced.

A sixth example of the hydrogen peroxide decomposition apparatus is shown in FIG. FIG. 12 has a configuration in which hydrogen peroxide concentration measuring means 107 is installed in parallel with FIG. This hydrogen peroxide concentration measuring means 10
7 may be in the pipe or the condensate storage tank 2 on the upstream side of the catalyst packed tower. According to this configuration, the hydrogen peroxide concentration measuring means 107 measures the hydrogen peroxide concentration of the stored water in the condensate storage tank 2, and when the hydrogen peroxide concentration is high, the stored water is sent to the catalyst packed tower 102 by the pump 101. The hydrogen peroxide decomposition apparatus 2 can be operated as needed.

A seventh example of the hydrogen peroxide decomposition apparatus is shown in FIG. FIG. 13 shows the hydrogen peroxide concentration measuring means 107 in FIG.
It has a configuration in which a is mounted in parallel. According to this configuration, the hydrogen peroxide decomposing device 2 can be operated as necessary based on the measurement result of the hydrogen peroxide concentration measuring means 107a, and the stored water is added to the measurement result of the hydrogen peroxide concentration measuring means 107b. By passing water through the catalyst packed tower 102 as many times as necessary, the hydrogen peroxide concentration can be surely reduced. If the method of the sixth example or the seventh example is adopted, the catalyst can be used only when necessary, so that the deterioration of the catalyst can be prevented.

In the hydrogen peroxide decomposition apparatus 4 illustrated in FIGS. 7 to 13, it is appropriate to use a catalyst in which at least one of Pt, Ru, Rd and Pd is supported on alumina or silica. This catalyst is characterized in that Pt, Ru, Rd, and Pd are supported on alumina or silica to increase the contact area between the solvent containing hydrogen peroxide and the white metal element. Of these, an example of a catalyst in which ruthenium is supported on alumina is shown in FIG. Here is the residence time

[0026]

## EQU1 ## The time determined by (cross-sectional area of catalyst packed tower 102) × (height of catalyst packed tower 102) / (solvent flow rate) corresponds to the contact time between hydrogen peroxide and the catalyst. It can be seen from FIG. 14 that 80% or more of the hydrogen peroxide decomposes when the residence time is about 40 seconds. Further, it can be seen that hydrogen peroxide can be decomposed sufficiently even at room temperature (25 ° C.). FIG. 15 shows a comparison with other catalysts. Where k on the vertical axis
Is the reaction rate constant of the hydrogen peroxide decomposition reaction and has the following relationship with the above residence time.

[0027]

[Formula 2] (residence time) = 1n (1 / (1- (remaining ratio of hydrogen peroxide))) / k (remaining ratio of hydrogen peroxide) = (hydrogen peroxide concentration before passing through catalyst) / (catalyst Therefore, the higher the k, the shorter the residence time, that is, the more efficiently hydrogen peroxide can be decomposed. It can be seen from FIG. 15 that the catalyst supporting ruthenium on alumina can decompose hydrogen peroxide efficiently even at a low temperature. Further, it is understood that the hydrogen peroxide can be decomposed more efficiently by heating the water passing liquid.

As described above, in a nuclear power plant equipped with such a hydrogen peroxide decomposing device, the condensate storage tank used for cleaning the resin of the condensate purifier is installed by installing the hydrogen peroxide decomposing device. Since the concentration of hydrogen peroxide in stored water can be made sufficiently small, deterioration of resin performance due to hydrogen peroxide can be prevented, and when draining the reactor water stored in the reactor well during the periodic inspection of the reactor, the reactor water is directly restored. Since it can be brought into the water storage tank, the periodic inspection period of the reactor can be shortened.

In the hydrogen peroxide decomposing device, hydrogen peroxide can be decomposed efficiently by using alumina or silica carrying at least one of Pt, Ru, Rd and Pd as a catalyst. By installing a hydrogen peroxide concentration measuring means on the upstream side of the catalyst packed tower and activating the hydrogen peroxide decomposing apparatus based on the measurement result, the catalyst used in the hydrogen peroxide decomposing apparatus can be used without waste. The hydrogen peroxide concentration measuring means is installed on the downstream side of the catalyst packed tower, and based on the measurement result, it is judged whether to flow the water flowing liquid downstream or the packed tower upstream, so that the hydrogen peroxide can be more reliably discharged. The concentration can be reduced.

[0030]

As described above, according to the present invention, it is possible to shorten the periodic inspection of the nuclear reactor or the various working hours inside the nuclear reactor, and the performance of the resin for cleaning the nuclear reactor water deteriorates. It is possible to obtain a nuclear power plant without a problem.

[Brief description of drawings]

FIG. 1 is a system diagram showing a main part of a nuclear reactor water discharge (circulation) system of a nuclear power plant of the present invention.

FIG. 2 is a system diagram showing a reactor water system of a conventional nuclear power plant.

[Fig. 3] Reactor water discharge (circulation) of a conventional nuclear power plant
It is a power system diagram which shows the principal part of a power system.

FIG. 4 is a system diagram when the reactor water of a conventional reactor well is directly brought into a condensate storage tank.

FIG. 5 is a main part system diagram of a reactor water discharge (circulation) system showing another embodiment of the nuclear power plant of the present invention.

FIG. 6 is a main part system diagram of a reactor water discharge (circulation) system showing another embodiment of the nuclear power plant of the present invention.

FIG. 7 is a block diagram showing an embodiment of a hydrogen peroxide decomposition apparatus.

FIG. 8 is a block diagram showing another embodiment of the hydrogen peroxide decomposition apparatus.

FIG. 9 is a block diagram showing another embodiment of the hydrogen peroxide decomposition apparatus.

FIG. 10 is a block diagram showing another embodiment of the hydrogen peroxide decomposition apparatus.

FIG. 11 is a block diagram showing another embodiment of the hydrogen peroxide decomposing apparatus.

FIG. 12 is a block diagram showing another embodiment of the hydrogen peroxide decomposing apparatus.

FIG. 13 is a block diagram showing another embodiment of the hydrogen peroxide decomposing apparatus.

FIG. 14 is a characteristic diagram showing the residence time dependence of the hydrogen peroxide decomposition rate.

FIG. 15 is a characteristic diagram showing temperature dependence of reaction rate of hydrogen peroxide decomposition reaction.

[Explanation of symbols]

1 ... Reactor well, 2 ... Condensate storage tank, 3 ... Condensate purifier, 4 ... Hydrogen peroxide decomposition device, 5 ... Core, 6 ... Pressure vessel, 7 ... Turbine, 8 ... Condenser, 9 ... Water supply Pump, 10
... Heat exchanger, 11 ... Suppression pool, 12 ... Radioactive waste treatment system, 101 ... Pump, 102 ... Catalyst packed tower, 103 ... Heater, 104 ... Stainless mesh tube,
105 ... Stirrer, 106 ... Catalyst filling container, 107, 1
07a, 107b ... Hydrogen peroxide concentration measuring means, 108 ...
Branch valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yamato Asakura 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory

Claims (21)

[Claims] 1. A pressure vessel equipped with a nuclear fuel core, a reactor well provided in a reactor, and a condensate storage tank for storing condensate. In the inspection work method of the nuclear power plant, which is formed so that the reactor water is filled into the condensate storage tank after the predetermined work, the condensate storage tank, A hydrogen peroxide decomposing device for decomposing the contained hydrogen peroxide is provided, and when the reactor water in the reactor well is brought into the condensate storage tank, the reactor water is brought directly into the condensate storage tank. Then, a method for inspecting a nuclear power plant is characterized in that after that, the reactor water in the condensate storage tank is decomposed by hydrogen peroxide in the hydrogen peroxide decomposition device. 2. A pressure vessel equipped with a nuclear fuel core, a reactor well provided in the reactor, and a condensate storage tank for storing condensate. In a method for inspecting a nuclear power plant, wherein the reactor water is filled in the reactor and the reactor water is brought into the condensate storage tank after a predetermined operation, the reactor water discharge system of the condensate storage tank. A hydrogen peroxide decomposition device for decomposing hydrogen peroxide, and when discharging the reactor water in the reactor well, bring the reactor water directly to the condensate storage tank, A method for inspecting a nuclear plant, characterized in that the hydrogen peroxide decomposition device provided in the reactor water discharge system decomposes the reactor water into hydrogen peroxide. 3. A pressure vessel equipped with a nuclear fuel core, a reactor well, a condensate storage tank for storing condensate, and a condensate purifying device for purifying condensate. In a nuclear power plant in which the well is filled with reactor water and the reactor water is brought into the condensate storage tank after a predetermined inspection work, in the condensate storage tank, a hydrogen peroxide decomposition device is provided. Installed
A nuclear plant characterized in that the reactor water in a condensate storage tank is decomposed with hydrogen peroxide. 4. A pressure vessel equipped with a nuclear fuel core, a reactor well, a condensate storage tank for storing condensate, and a condensate purification device for purifying the condensate. In a nuclear power plant in which the well is filled with reactor water and the reactor water is brought into the condensate storage tank after a predetermined inspection work, the condensate storage tank and the condensate purifier are provided. A nuclear plant characterized in that a hydrogen peroxide decomposing device is installed in the connected water passage, and the hydrogen peroxide decomposing process of the reactor water is performed on the downstream side of the condensate storage tank. 5. A reactor equipped with a pressure vessel equipped with a nuclear fuel core, a reactor well, a condensate storage tank for storing condensate, and a condensate purification device for purifying the condensate. In a nuclear power plant in which a well is filled with reactor water and the reactor water is brought into the condensate storage tank after a predetermined inspection work, a hydrogen peroxide decomposition device is provided in the condensate storage tank section. The upstream side of this hydrogen peroxide decomposer is connected to the condensate storage tank, and the downstream side of the hydrogen peroxide decomposer is connected to the condensate purifier or both the condensate purifier and the condensate storage tank. A nuclear power plant characterized by being formed so as to be connected. 6. The nuclear power plant according to claim 3, 4 or 5, wherein the hydrogen peroxide decomposition apparatus is formed so as to be removable and movable. 7. The nuclear power plant according to claim 3, 4 or 5, wherein the hydrogen peroxide decomposition apparatus uses a catalyst carrying a metal catalyst for hydrogen peroxide decomposition reaction. 8. The hydrogen peroxide decomposer comprises Pt and Ru.
6. The nuclear power plant according to claim 3, 4 or 5, wherein a catalyst in which at least one of Rd and Pd is supported on alumina or silica is used. 9. A reactor equipped with a pressure vessel equipped with a nuclear fuel core, a reactor well, a condensate storage tank for storing condensate, and a condensate purifying device for purifying condensate. In a nuclear power plant in which the well is filled with reactor water and the reactor water is brought into the condensate storage tank after a predetermined inspection work, the reactor well and the condensate storage tank are connected. To the pipe, the upstream side of the pump is connected, the pump downstream side and the upstream side of the catalyst packed tower filled with a catalyst for hydrogen peroxide decomposition reaction are connected, the downstream side of the catalyst packed tower and the upstream side of the pipe. A nuclear plant comprising a hydrogen peroxide decomposing device connected to the condensate storage tank, the downstream side of which is connected to the condensate storage tank. 10. A reactor comprising a pressure vessel equipped with a nuclear fuel core, a reactor well, a condensate storage tank for storing condensate, and a condensate purifying device for purifying the condensate. In a nuclear power plant in which the well is filled with reactor water and the reactor water is brought into the condensate storage tank after a predetermined inspection work, the reactor well and the condensate storage tank are connected. To the pipe, the upstream side of the pump is connected, the pump downstream side and the upstream side of the catalyst packed tower filled with a catalyst for hydrogen peroxide decomposition reaction are connected, the downstream side of the catalyst packed tower and the upstream side of the pipe. A nuclear power plant comprising a hydrogen peroxide decomposing device connected to the condensate purifier, the downstream side of which is connected to the condensate purifier. 11. A reactor equipped with a pressure vessel equipped with a nuclear fuel core, a reactor well, a condensate storage tank for storing condensate, and a condensate purification device for purifying the condensate. In a nuclear power plant in which the well is filled with reactor water and the reactor water is carried into the condensate storage tank after a predetermined inspection work, below the stored water level of the condensate storage tank. The upstream side of the drainage pump is connected, the pump downstream side and the upstream side of the catalyst packed tower filled with the catalyst for the hydrogen peroxide decomposition reaction are connected, and the downstream side of the catalyst packed tower and the upstream side of the pipe are connected, A nuclear power plant comprising a condensate purifier or a hydrogen peroxide decomposing device formed by connecting the downstream side of the pipe to the condensate purifier and the condensate storage tank. 12. The nuclear power plant according to claim 9, 10 or 11, wherein the connection positions of the pump and the catalyst packed tower are reversed. 13. A means for measuring hydrogen peroxide concentration is provided in the condensate storage tank or a pipe on the upstream side of the catalyst tower, and the operation of the pump is adjusted based on the measuring means of the hydrogen peroxide measuring means. Claims 9, 10 formed in
11. The nuclear power plant according to 11 or 12. 14. A means for measuring a hydrogen peroxide concentration is provided on the downstream side of the catalyst packed tower, and a branch valve for branching the water flow solution is provided on a pipe on the downstream side of the hydrogen peroxide measuring means. 10. One of the downstream sides of the above is connected by a pipe to the upstream side of the catalyst packed column, and the branch valve is formed based on the measuring means of the hydrogen peroxide measuring means so as to adjust the destination of the water passing liquid. , 10, 11, 12 or 13 nuclear power plant. 15. The catalyst packed tower is provided with a heater for heating the water-containing liquid on the upstream side, or the catalyst packed tower is provided with a heating function.
Or the nuclear power plant according to 14. 16. The nuclear power plant according to claim 9, 10, 11, 11, 12, 13, 14 or 15, wherein said hydrogen peroxide decomposing device uses a catalyst carrying a metal catalyst for hydrogen peroxide decomposing reaction. 17. The hydrogen peroxide decomposer comprises Pt and R.
11. A catalyst in which at least one of u, Rd, and Pd is supported on alumina or silica is used.
The nuclear power plant according to 11, 12, 13, 14 or 15. 18. The upstream side of the pipe is connected below the liquid level of the condensate storage tank or to the pipe connecting the reactor well and the condensate storage tank, and the upstream side of the pump is connected to the downstream side of the pipe. Connected, the pump downstream side and the upstream side of the catalyst packed tower filled with a catalyst for hydrogen peroxide decomposition reaction is connected, the downstream side of the catalyst packed tower and the upstream side of the pipe, the downstream side of the pipe A hydrogen peroxide decomposition apparatus characterized in that it is connected to a condensate storage tank. 19. A means for measuring a hydrogen peroxide concentration is provided in a pipe on the upstream side of the condensate storage tank or the catalyst tower, and the operation of the pump is adjusted based on the measurement result of the hydrogen peroxide measuring means. The apparatus for decomposing hydrogen peroxide according to claim 18, wherein 20. A means for measuring the hydrogen peroxide concentration is provided on the downstream side of the catalyst tower, and a branch valve for branching the water flow solution is provided on a pipe on the downstream side of the hydrogen peroxide measuring means,
20. One of the downstream side of the branch valve is connected to the upstream side of the catalyst packed column by a pipe, and the operation of the pump is adjusted based on the measurement result of the hydrogen peroxide measuring means.
The hydrogen peroxide decomposition apparatus described. 21. The apparatus for decomposing hydrogen peroxide according to claim 18, wherein a heater for heating the water flow liquid is provided on the upstream side of the catalyst packed tower, or the catalyst packed tower is provided with a heating function.