JPH11281787A - Reactor container provided with flammable gas processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove hydrogen gas plentifully generated in a reactor container efficiently and in long term without leaking out the gas in the container. SOLUTION: A reactor container 1 containing a reactor pressure vessel 5 is equipped with a flammable gas processor 9 which is characterized by using a catalyst 10 promoting recombining of hydrogen gas and oxygen gas and is provided with an electrical heater 11 and an electrode adsorbing hydrogen gas and an electrode adsorbing oxygen gas as power source operating the heater 11, connected with fuel battery 15 converting the recombining energy of hydrogen and oxygen to electric energy, elevating part of or whole temperature of the catalyst 10, improving ignition of the catalyst 10 and reduce the hydrogen gas concentration inside the reactor container 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the treatment of combustible gas which may be generated in a containment of a light water reactor type nuclear power plant in the event of an accident. The present invention relates to a containment vessel using a combustible gas treatment facility used.

[0002]

2. Description of the Related Art In a nuclear power plant, in the event that the primary piping of a nuclear reactor is damaged, coolant for cooling the reactor is discharged as steam into the reactor containment vessel from a broken pipe, and Coolant in the furnace pressure vessel is reduced. As a result, the pressure and temperature in the containment vessel rise.

[0003] The above-described coolant loss accident (hereinafter referred to as LO
CA), emergency core cooling system (hereinafter referred to as ECC)
Due to the automatic start of S), even if a single failure of the ECCS is assumed, the reactor is cooled and fuel is not damaged, but water in the reactor pressure vessel and reactor containment vessel due to high radiation fields By radiolysis, hydrogen gas and oxygen gas are generated. These gases are released from the pipe break into the containment vessel.

[0004] This state continues and the hydrogen gas concentration becomes 4
When the vol% and the oxygen concentration exceed 5 vol%, the gas becomes flammable and the hydrogen gas concentration further increases if left as it is.

[0005] In order to cope with such an event, a boiling water reactor (hereinafter, BWR) which employs a pressure-suppressed type containment vessel among light water reactor type nuclear power plants, as a countermeasure, is to use a normal nuclear reactor. In the event of an accident, the atmosphere inside the reactor containment vessel was replaced with nitrogen gas. In the event of an accident, the atmosphere inside the containment vessel was taken out with a blower, and the temperature was raised with an electric heater to recombin hydrogen and oxygen to form water. At the same time, a combustible gas concentration control system (hereinafter, referred to as FCS) using a heated recombiner that is cooled by a cooler and then returned to the containment vessel is installed.

[0006] This FCS responds mainly by recombining hydrogen gas and oxygen gas generated by radiation water decomposition for a long time after LOCA to form water. With regard to the generation of large amounts of hydrogen gas due to the water-metal reaction expected at the time of a severe accident exceeding the design standard accident, the atmosphere in the reactor containment vessel can be maintained at a low oxygen gas concentration atmosphere by replacing the atmosphere with nitrogen gas. It does not reach the territory.

In a nuclear power plant having a large containment vessel, in the case of a design standard accident, the hydrogen gas concentration after the accident is slowly increased because the atmosphere is diluted to the atmosphere of the large-capacity containment vessel. It is not necessary to respond to equipment. There is a plan to adopt a forced ignition type FCS called an igniter for the generation of a large amount of hydrogen gas due to a water-metal reaction expected at the time of a severe accident exceeding the design standard accident.

In the above-mentioned conventional type, a forced driving force such as a blower or a heater and a power supply necessary for driving the same are used. Couplers have been developed. This device combines a catalyst-type hydrogen-reactive material in the form of a pellet in a steel box into a cartridge, and uses a gas flow path between the cartridges to recombine hydrogen and oxygen, or a catalytic-type hydrogen-reactive material Is attached to the surface of the plate, and hydrogen and oxygen are recombined using a gas flow path between the plates. JP-A-58-139591 discloses an example in which a hydrogen oxidation catalyst is disposed in a containment vessel. JP-A-6-130170 discloses a method for reducing the concentration of hydrogen gas comprising a catalytic hydrogen reactant in a containment vessel. An example of disposing materials is disclosed.

Japanese Patent Application Laid-Open No. 4-104090 discloses an apparatus in which a thin plate-shaped hydrogen-adsorbing substance is suspended at an upper portion in a containment vessel to adsorb hydrogen gas, thereby reducing hydrogen gas. Japanese Patent Laying-Open No. 4-34395 discloses an example in which a hydrogen adsorbing apparatus containing a powdered hydrogen adsorbing metal is installed in a containment vessel dry well, suppression chamber, or the like.

[0010]

In a BWR having a pressure-suppressed reactor containment vessel, if a catalytic hydrogen gas countermeasure equipment among the hydrogen countermeasure equipment shown in the above-mentioned prior art is used, a BWR atom at the time of an accident is required. Hydrogen gas and oxygen gas generated under the conditions inside the reactor containment vessel must be recombined on the surface of the catalyst material incorporated in the hydrogen countermeasure equipment.

However, among the conditions inside the BWR containment vessel at the time of the accident, there are conditions in which both the hydrogen gas concentration and the oxygen gas concentration are low in the early stage after the accident. During the transition from the low hydrogen gas concentration and low oxygen gas concentration state to the flammable region, it is required that the catalytic hydrogen gas countermeasure equipment be reliably started. In addition to the above conditions, when LOCA is assumed, the inside of the containment vessel becomes high in humidity due to the outflow of the primary cooling water or steam from the rupture opening. The surface of the catalyst material contained in the hydrogen countermeasure equipment is exposed to high humidity, and the surface is wetted by water due to condensation of steam. In addition, BW in Japan
In R, after LOCA, water is sprayed inside the reactor containment vessel to prevent excessive pressure rise in the reactor containment vessel due to accumulation of condensable gas released inside the reactor containment vessel. There is a possibility that the surface of the catalyst material may be wet by the dispersion of floating small droplets (mist) generated by the spray.

In general, when a catalyst is wet with water, the surface of the catalyst is covered with a water film, and the catalytic reaction is suppressed. Therefore, even when the surface of a catalyst material built in a hydrogen countermeasure equipment is wet with water, It is possible that the catalytic reaction in the recombination reaction between the hydrogen gas and the oxygen gas may be inhibited. Especially,
In the early stage after the accident, in which both the hydrogen gas concentration and the oxygen gas concentration are low, the start of the catalytic reaction may be hindered due to the wetness of the catalyst and the high water vapor density.

At the time of LOCA in BWR, control of combustible gas is required for FCS for a long time. Therefore, even if the concentration decreases once hydrogen gas and oxygen gas are recombined and the recombination reaction by the catalyst stops, if the concentration of combustible gas in the reactor containment vessel rises again, the FCS will not fail. Have to start. In addition, since the spray is continuously operated inside the containment vessel, a hydrogen countermeasure equipment using a catalyst that is reliably started several times even under these conditions is required.

In a conventional catalytic recombiner, there is a method of installing a water droplet prevention body and its support so that water does not splash on the catalyst. However, when these are installed, the overall height of the catalyst device itself is reduced. There is a problem that it becomes large and the installation place is restricted. In addition, if the water droplet preventive body is brought close to the catalyst so that water droplets do not adhere, the resistance of the gas flow of the entire catalyst device increases, causing a reduction in the throughput.

An object of the present invention is to prevent a catalytic reaction from being hindered by adhesion of water discharged into a reactor containment vessel at the time of an accident in a flammable gas treatment facility using a catalyst, thereby ensuring a catalytic reaction. The reactor containment vessel equipped with a flammable gas treatment facility capable of preventing the flammable area from being re-combined with hydrogen gas and oxygen gas contained in the atmosphere gas in the containment vessel after the accident To provide.

[0016]

The above objects can be attained by providing the following apparatus.

A combustible gas treatment facility using a catalyst that promotes the recombination of hydrogen gas and oxygen gas enables the generation of atomic gas by hydrogen gas and oxygen gas generated in a reactor containment vessel by radiolysis of cooling water during a design standard accident. Prevent the pressure inside the reactor containment vessel from rising and the abnormal combustion of hydrogen gas inside the reactor containment vessel, reduce the hydrogen gas concentration inside the reactor containment vessel, and vent the reactor containment vessel. The accident can be converged without any.

As described in the first aspect, the heating element for raising the temperature of a part or the whole of the catalyst removes water droplets adhered by the containment container spray or the like, and can stably start the catalytic reaction.

In the case where the electric heater is a heating element, an electrode for adsorbing hydrogen gas and an electrode for adsorbing oxygen gas are provided as power sources for operating the heating element. By connecting a fuel cell that converts binding energy into electric energy, an independent device that does not depend on an external power source or the like can be provided.

There are various types of fuel cells depending on the type of electrolyte. At present, there are a solid polymer electrolyte type, a phosphoric acid electrolyte type, and a solid oxide electrolyte type that can be applied to actual equipment.

The solid polymer electrolyte type uses an ion exchange membrane, in which hydrogen ions are charge carriers, and the operating temperature is about 70 ° C. A fuel cell has two electrodes, a fuel electrode (negative electrode) and an air electrode (positive electrode). When hydrogen enters the fuel electrode,
Hydrogen ions are generated and electrons are emitted. The hydrogen ions move in the electrolyte and reach the air electrode side. At the air electrode, water is generated by hydrogen ions, oxygen, and electrons that have passed through the external conductor. As described above, the fuel cell not only recombines hydrogen and oxygen but also generates electricity. For a single cell, the voltage is about 0.7 V and the current density is 0.6 A / cm ² . Since the generated voltage is low, the electrodes can be brought close to each other, and a laminated structure can be obtained. Battery performance changes depending on the type of electrolyte polymer membrane.

The solid oxide electrolyte type also has a hydrogen ion conductive type. In this method, hydrogen is converted to hydrogen ions in a solid electrolyte to carry charges. A zirconia electrolyte will not work unless it is at a high temperature of around 1000 ° C.
Some electrolytes can be used at temperatures below ℃.

Also, the fuel cell automatically functions when hydrogen gas and oxygen gas are generated inside the containment vessel.
A passive and highly reliable device can be provided.

According to a third aspect of the present invention, the fuel cell is surrounded by a radiation-attenuating material to prevent the battery from deteriorating due to the radiation in the containment during standby or accident, and to provide a highly reliable device. Can be.

According to a fourth aspect of the present invention, the containment container spray water is prevented from entering the battery in the event of an accident to cause a failure such as a short circuit by surrounding the fuel cell with a water droplet entry preventing member so as to prevent the water droplet from entering the inside of the fuel cell. It is possible to provide a highly reliable device.

According to a fifth aspect of the present invention, a material that generates heat when absorbing water is disposed as a heating element for raising the temperature of the catalyst, so that when a water droplet adheres due to a containment spray or the like, the heating element generates heat. By heating the nearby catalyst, water droplets can be removed and the catalytic reaction can be started stably. In addition, the heating element operates naturally when spray water or the like is splashed, and does not depend on an external power supply, etc.
An independent passive and reliable device can be provided.

As a material that generates heat when absorbing water, for example, a lime-based warming agent is generally widely known.

According to a sixth aspect of the present invention, when a material that generates heat when absorbing hydrogen is disposed as a heating element for raising the temperature of the catalyst, the heating element generates heat when hydrogen gas is generated inside the containment vessel. However, by heating the nearby catalyst, water droplets can be removed and the catalytic reaction can be started stably. In addition, the heating element operates naturally when hydrogen gas is generated inside the storage container and does not depend on an external power supply or the like, so that an independent passive and highly reliable device can be provided.

Materials that generate heat when absorbing hydrogen include:
Hydrogen storage alloys such as lanthanum-nickel, titanium-iron, magnesium-nickel, and iron-nickel-titanium are generally widely known as generating heat when absorbing hydrogen gas.

According to a seventh aspect of the present invention, the container for storing the catalyst of the flammable gas treatment equipment has openings at the upper and lower parts to allow gas to pass therethrough, and water from above and below. Heating element that generates heat when hydrogen is absorbed inside the container inside the double-structured container, in which a cylindrical inner storage means with a structure that makes it difficult for the inside to enter is arranged to store the catalyst. Alternatively, by arranging a catalyst that generates heat by the recombination reaction by promoting the recombination reaction of hydrogen gas and oxygen gas, or by disposing both the heating element and the catalyst, the reaction heat generated inside the inside of the double structure and the catalyst near the outside of the storage means The reaction of the entire catalyst can be started stably by removing water droplets caused by the containment spray or the like attached to the catalyst.

The double-structure inner container has a structure in which water hardly enters, so that when a heating element that generates heat when absorbing hydrogen is disposed inside, the heat generation due to hydrogen absorption can be efficiently performed. When a catalyst that generates heat by the recombination reaction is disposed inside, a highly reliable apparatus can be provided by reliably starting the recombination reaction by the catalyst.

In addition, since the catalyst container has a double structure, only a part of the catalyst part is prevented from flowing by the water droplet adhesion preventing structure, but the entire gas flow is not hindered. Thus, it is possible to reduce a decrease in efficiency of the entire apparatus. Further, since there is no need to install a water droplet prevention body and its support above the catalyst, it is possible to shorten the overall height of the apparatus and provide an apparatus which is not restricted by an installation place or the like.

As described in claim 8, the outside of the inner storage means of the catalyst storage means having a double structure is brought into contact with the catalyst,
By facilitating the transfer of the heat generated inside the inner storage means to the catalyst installed outside, the water droplets attached to the catalyst disposed inside the catalyst storage means are efficiently removed by the heat and the engine is started stably. An apparatus can be provided.

According to a ninth aspect of the present invention, the inner storage means of the catalyst storage means having a double structure is made of a material having good heat transfer, so that the heat generated inside the inner storage means is installed outside. By making it easier to transmit the catalyst to the existing catalyst, it is possible to provide a device that efficiently removes water droplets attached to the catalyst disposed outside the catalyst storage means by heat and starts the catalyst stably.

According to a tenth aspect of the present invention, a structure is adopted in which, for example, the lower opening area of the inner storage means is increased so that gas can easily pass through the inside of the inner storage means of the catalyst storage means having a double structure. This makes it possible to reliably start a heating element that absorbs hydrogen and generates heat or a catalyst that promotes a recombination reaction between hydrogen gas and oxygen gas, which is arranged inside the inner storage means, and the generated catalyst heat is used to store the catalyst. By removing the water droplets attached to the catalyst inside the means due to the containment spray or the like by heat, the reaction of the entire catalyst can be started stably, and a highly reliable device can be provided.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, 5, and 6. FIG.

FIG. 1 shows a combustible gas treatment facility using a catalyst for promoting the recombination of hydrogen gas and oxygen gas inside a reactor containment vessel having a pressure suppression pool, a heating element for heating the catalyst, and a heating element. An example of an embodiment in which an electrode for adsorbing hydrogen gas and an electrode for adsorbing oxygen gas are provided as a power supply for operating the fuel cell, and a fuel cell that converts the recombination energy of hydrogen and oxygen into electric energy is provided.

At the time of LOCA or the like, the reactor coolant flows out of the reactor pressure vessel 5 through the break port 6 into the reactor containment vessel 1. At this time, hydrogen gas and oxygen gas generated by the decomposition of water by radiation inside the reactor pressure vessel 5 together with the reactor coolant are also contained in the reactor containment vessel 1.
It is released into an internal drywell (hereinafter, D / W) 2 and a suppression chamber (hereinafter, S / C) 3. Hydrogen gas and oxygen gas accumulate inside the D / W2 and S / C3, and the inside of the flammable gas processing equipment 9 is used to prevent the internal pressure from rising and the hydrogen gas and oxygen gas from burning rapidly. The hydrogen gas and the oxygen gas are recombined by the catalyst 10 attached to the catalyst 10 and which promotes the recombination of the hydrogen gas and the oxygen gas.

At the time of LOCA, the containment vessel spray 7 is operated to reduce or cool the inside of the containment vessel 1 and spray water 8 is sprayed. Therefore, the catalyst 10 inside the flammable gas treatment equipment 9 gets wet with water,
The catalytic reaction is prevented from starting. In order to prevent this, a heating element 11 is arranged inside or near the catalyst 10,
When the heating element generates heat, water droplets attached to the catalyst 10 are removed, so that the recombination reaction can be started stably.

The heating element 11 is connected to the electric wire 14,
Is connected to a fuel cell 15 which has an electrode for adsorbing hydrogen gas and an electrode for adsorbing oxygen gas, and which converts the recombination energy of hydrogen and oxygen into electric energy. As a result, when hydrogen gas and oxygen gas are generated inside the storage container 1, the fuel cell 15 naturally starts generating power, and the electricity generated in the fuel cell 15 is sent to the heating element 11 via the electric wire 14. Thus, when hydrogen gas and oxygen gas are generated inside the reactor containment vessel 1, the device can start heating the catalyst 10 inside the combustible gas treatment equipment 9 without requiring an external signal and power supply.

The area around the fuel cell 15 is covered with a casing 16 made of a material that does not transmit radiation to prevent the fuel cell 15 from being deteriorated by radiation during normal operation or accident. In addition, the casing 16 has a structure in which the spray water 8 does not enter the fuel cell 15 and the storage container 1
The structure is such that the ambient gas inside the fuel cell 15 easily contacts the electrodes inside the fuel cell 15.

The switch 13 is connected to the electric wire 14 connecting the heating element 11 and the fuel cell 15, and the flammable gas processing equipment 9 is connected.
A thermometer 12 attached to the internal catalyst 10 is connected. When the temperature of the catalyst 10 rises due to the recombination reaction between hydrogen gas and oxygen gas, the temperature is detected by the thermometer 12 and a signal is sent to the switch 13 so that electricity from the fuel cell 15 can be cut off. .

There are various types of fuel cells that can be used as the fuel cell 15 depending on the type of electrolyte. At present, there are a solid polymer electrolyte type, a phosphoric acid electrolyte type, and a solid oxide electrolyte type that can be applied to actual equipment.

Among them, the solid polymer electrolyte type uses an ion exchange membrane, hydrogen ions are charge carriers, and the operating temperature is about 70 ° C. Fuel cell is fuel electrode (negative electrode)
And an air electrode (positive electrode). When hydrogen enters the fuel electrode, hydrogen ions are generated and electrons are emitted. The hydrogen ions move in the electrolyte and reach the air electrode side. At the air electrode, water is generated by hydrogen ions, oxygen, and electrons that have passed through the external conductor. As described above, the fuel cell not only recombines hydrogen and oxygen but also generates electricity. For a single cell, the voltage is about 0.7 V and the current density is 0.6 A / cm ² . Since the generated voltage is low, the electrodes can be brought close to each other, and a laminated structure can be obtained. Battery performance changes depending on the type of electrolyte polymer membrane.

There is also a solid oxide electrolyte type which has hydrogen ion conductivity. In this method, hydrogen is converted to hydrogen ions in a solid electrolyte to carry charges. A zirconia electrolyte does not work unless it is at a high temperature of around 1000 ° C., but some electrolytes can be used at a temperature of 50 ° C. or less.

Further, since the fuel cell automatically functions when hydrogen gas and oxygen gas are generated inside the containment vessel, the fuel cell is passive and highly reliable.

FIG. 2 shows an example of a catalyst cartridge in which a material that generates heat when absorbing water, which is generally known as a lime-based heating agent, is arranged near a flat plate type catalyst. The plate-type catalysts 17 are grouped into a plurality of sheets, and the holder 21 constitutes a cartridge. Catalyst 18 is coated on substrate 20. With respect to one or more of the catalysts 17 installed in the cartridge, a heating element 19 that generates heat when absorbing water is applied to a part of the catalyst. When water droplets from the storage container spray or the like adhere to the heating element 19, they absorb the water and generate heat. Since heat is transmitted to the catalyst 18 through the contact surface with the catalyst 18 and the base 20, the water droplets attached to the surface of the catalyst 18 can be dried and removed.

In addition to the case where a plate-type catalyst is used, when the catalyst is a pellet type, a pellet-like heating element which generates heat when absorbing water is mixed into the catalyst pellet, or the pellet-like heating element is used. By arranging the bodies in the vicinity of the catalyst, the catalyst wet by spraying or the like can be dried by heating.

FIG. 3 shows an example of a catalyst cartridge in which a material that generates heat when absorbing hydrogen is arranged near the flat plate type catalyst. The plate-type catalysts 17 are grouped into a plurality of sheets, and the holder 21 constitutes a cartridge. Catalyst 18 is coated on substrate 20. With respect to one or more of the catalysts 17 installed in the cartridge, a heating element 22 that generates heat when absorbing hydrogen is applied to a part of the catalyst 17. When hydrogen gas generated by the radiolysis of water or the like is absorbed by the heating element 22, heat is generated. Since heat is transmitted to the catalyst 18 through the contact surface with the catalyst 18 and the base 20, the water droplets attached to the surface of the catalyst 18 can be dried and removed. Materials that generate heat when absorbing hydrogen include lanthanum-nickel, titanium-iron, and magnesium-
Hydrogen storage alloys such as nickel and iron-nickel-titanium are generally widely known to generate heat when absorbing hydrogen gas, and are used as materials that generate heat when any of them absorbs hydrogen.

In addition to the case where a plate-type catalyst is used, when the catalyst is in the form of a pellet, a pellet-like heating element which generates heat when absorbing hydrogen is mixed in the catalyst pellet, or
Alternatively, by arranging the pellet-shaped heating elements collectively and in the vicinity of the catalyst, the catalyst wetted by spraying or the like can be heated and dried.

FIG. 4 shows an example in which a casing having a structure for preventing water from entering from above is installed inside a combustible gas treatment facility using a catalyst to form a double structure. Water droplets sprayed by the containment spray enter the casing 25 through the opening 26 at the upper part of the casing 25.
7, water droplets do not adhere to the heat generating body 28 inside the casing 25 because the heat generating body 28 is removed outside the casing 25. Since water droplets do not adhere to the heating element 28, the casing 2
The heating element 28 generates heat more surely and earlier than the catalyst 24 arranged outside. The heating element 28 may be a catalyst that promotes a recombination reaction between hydrogen gas and oxygen gas, or may be a heating element that generates heat by absorbing hydrogen gas. The heat generated by the reaction is transferred to the casing 2 via the casing 25.
5 Water droplets that are transmitted to the catalyst 24 near the outside and increase on the temperature of the catalyst 24 are dried and removed because the temperature of the catalyst 24 rises, so that the catalyst 24 outside the casing 25 can also reliably start a recombination reaction. . FIG. 5 shows the casing 2 of FIG.
FIG. 5 is a vertical cross-sectional view of a casing 5 and its vicinity, showing an example of the internal structure of a casing having a structure for preventing water from entering from above. The upper part of the casing 29 has a structure in which the partition plate 33 is alternately combined so that water droplets due to the storage container spray or the like do not directly reach the heating element 28. The water droplets that have entered are removed from the casing 25 through the drain holes 27. The gas that has passed through the heating element 28 is
By arranging the partition plate 33 so that the inside end of the casing 25 is inclined upward so as to be easily removed upward, the flow path resistance can be reduced. The gas suction port 32 at the lower portion of the casing 25 is formed in a funnel shape to increase the opening area and reduce the suction resistance, thereby increasing the amount of gas passing through the heating element 33 and improving the reaction efficiency. The heat generating body 28 inside the casing 25 is brought into contact with the heat conductive plate 31 and the external catalyst 24 is also brought into contact with the heat conductive plate 31 so that the heat generated by the internal heat generating body 28 can be converted into heat having excellent heat conductivity. By transmitting the water to the external catalyst 24 via the conductive plate 31, the water droplets adhering to the surface of the external catalyst 24 can be dried and removed.

FIG. 6 shows an example in which a heating element that generates heat when absorbing water is installed inside a flammable gas processing facility using a catalyst to form a double structure. The water droplets sprayed by the containment container spray flow into a casing 38 in which a heating element 36 is held inside through a water inlet 37. The water inlet 37 has a funnel shape so that water can easily flow in, and has a large opening area. When the water flows into the casing 38, the water reacts with the heating element 36 held inside the casing 38. The heat generated by the reaction is transmitted to the catalyst 24 near the outside of the casing 38 via the casing 38, and the temperature of the catalyst 24 rises, so that water droplets attached to the surface are dried and removed. The recombination reaction can be reliably started.

[0053]

According to the first aspect of the present invention, hydrogen gas and oxygen gas generated by decomposition of reactor cooling water by radiation during a design standard accident can be effectively used for a long time without venting the reactor containment vessel. Can be removed. Since a catalyst having no moving parts is used for treating hydrogen gas and oxygen gas, the reliability is high, and the catalyst is a metal material, and the structure can be easily maintained and inspected with little deterioration over time. In addition, the use of the heating element prevents the attachment of water droplets, ensures the start of the catalyst, and improves the reliability of the equipment. In addition, passive and independent equipment can be provided by using a heating element that operates according to the atmosphere inside the containment vessel at the time of the accident.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention, the hydrogen treatment device main body is disposed in the containment vessel, and no external power supply or signal is required for operation. Can be enhanced. Also,
Since there is no need for a power supply or a signal, there is little restriction on the arrangement, and there is little effect on the arrangement of other equipment when installing this facility.

According to the invention of claim 3, according to claim 2,
In addition to the effects of the invention, the reliability of the fuel cell is improved by covering the fuel cell with a material that attenuates radiation, and the flammable gas processing equipment can be reliably started.

According to the invention described in claim 4, according to claim 3,
In addition to the effects of the invention, the structure of the fuel cell prevents the containment vessel spray water from flowing into the fuel cell, thereby improving the reliability of the fuel cell and enabling the flammable gas processing equipment to start reliably. .

According to the fifth aspect of the present invention, the first aspect is provided.
In addition to the effects of the invention, the use of a material that generates heat when absorbing water can simplify the means for drying the catalyst surface, and can provide a passive device because no activation signal or the like is required. .

According to the invention of claim 6, according to claim 1,
In addition to the effects of the invention, the use of a material that generates heat when absorbing hydrogen makes it possible to simplify the means for drying the catalyst surface and to provide a passive device because it does not require a start signal or the like. .

According to the invention of claim 7, according to claim 5,
Or, in addition to the effect of the invention of claim 6, inside the flammable gas treatment equipment, there are openings at the upper and lower parts, gas can pass through the inside, and water does not enter the inside from above and below. A flammable gas treatment facility is arranged in a double structure by disposing a cylindrical inner storage means having a leper structure, and a heating element and / or a part of a catalyst that generates heat when absorbing hydrogen is disposed inside the inner storage means, By adopting a structure in which water hardly enters the inside of the inner storage means, a water drop prevention plate which is conventionally installed on the entire catalyst to prevent the adhesion of water drops becomes unnecessary,
An apparatus can be provided in which the total height of the flammable gas processing equipment can be reduced, the arrangement is less restricted, and the installation of the equipment has less influence on other equipment arrangements. In addition, by limiting the portion where the water droplet adhesion preventing device is used, it is possible to lower the resistance of the entire flow as compared with installing a water droplet preventing plate covering the entire device, and it is possible to increase the efficiency of the catalyst. .

According to the invention of claim 8, according to claim 7,
In addition to the effect of the invention described in the above, the inner heating element storage means is brought into contact with the catalyst, and the heat generated by the inner heating element is easily transmitted to the catalyst installed outside, whereby the recombination reaction of the external catalyst is performed. And the entire catalyst can be started at an early stage.

According to the ninth aspect of the present invention, an eighth aspect of the present invention is provided.
In addition to the effects of the invention described in the above, by using a material having good heat transfer for the internal heating element storage means, it is possible to easily transfer the heat generated by the internal heating element to the catalyst installed outside. In addition, the start of the recombination reaction of the external catalyst is promoted, and the entire catalyst can be started at an early stage.

According to the tenth aspect, in addition to the effect of the ninth aspect, the opening area is increased so that the atmosphere gas inside the storage container easily passes through the inner heating element storage means. With this structure, it is possible to reliably start the reaction of the heating element inside the inner heating element storage means, and to provide a highly reliable device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a reactor containment vessel equipped with a hydrogen gas processing facility of the present invention.

FIG. 2 is a partially cutaway perspective view showing a structure of a catalyst using a heating element of the present invention.

FIG. 3 is a partially cutaway perspective view of a structure of a catalyst using another heating element of the present invention.

FIG. 4 is a partially cutaway perspective view showing a structure of a catalyst using the water droplet adhesion preventing body of the present invention.

FIG. 5 is a cross-sectional view of a part of the structure of a catalyst using the water droplet adhesion preventing body of the present invention.

FIG. 6 is a partially cutaway perspective view of a structure of a catalyst using still another heating element according to the present invention.

[Explanation of symbols]

1 ... Containment vessel, 2 ... Dry well, 3 ... Suppression chamber, 4 ... Suppression chamber water,
5: reactor pressure vessel, 6: break port, 7: containment spray, 8: spray water, 9: combustible gas treatment equipment, 10,
17, 18, 24 ... catalyst, 11, 19, 22, 28, 3
6 ... heating element, 12 ... thermometer, 13 ... switch, 14 ... electric wire, 15 ... fuel cell, 16, 23, 25, 38 ... casing, 20 ... base, 21 ... holder, 26 ... opening, 27
... water drain hole, 31 ... heat conductive plate, 32 ... gas suction port, 35,
39: water drop, 37: water inlet.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Noriaki Kamizuma 3-2-1 Sachicho, Hitachi City, Ibaraki Prefecture Within Hitachi Engineering Co., Ltd.

Claims (10)

[Claims] 1. A reactor containment vessel containing a reactor pressure vessel, comprising: a combustible gas treatment facility using a catalyst for promoting the recombination of hydrogen gas and oxygen gas; A flammable gas treatment facility, characterized in that a heating element that generates heat according to the atmospheric state is brought into contact with or close to the catalyst, and a part or all of the catalyst is heated. Reactor containment vessel. 2. An apparatus according to claim 1, wherein said heating element is a heating element which generates heat by electricity, and comprises an electrode for adsorbing hydrogen gas and an electrode for adsorbing oxygen gas as a power source for operating said heating element. A containment vessel provided with a combustible gas processing facility, wherein a fuel cell for converting binding energy into electric energy is connected. 3. The containment vessel according to claim 2, wherein the fuel cell is surrounded by a material that attenuates radiation. 4. The reactor containment vessel according to claim 3, wherein said fuel cell is surrounded by a water droplet intrusion preventing body so that water droplets do not enter the inside of said fuel cell. 5. The reactor containment vessel according to claim 1, wherein said heating element is a heating element that generates heat when absorbing water. 6. A heating element according to claim 1, wherein said heating element is a heating element that generates heat when absorbing hydrogen, or a heating element that generates heat when absorbing water and a heating element that generates heat when absorbing hydrogen. Reactor containment with flammable gas treatment equipment. 7. The means for storing a catalyst according to claim 5 or 6, wherein the means for storing the catalyst has upper and lower openings to allow gas to pass therethrough, and water to enter from above and below. Means for storing the catalyst by arranging a cylindrical inner storage means having a structure that is difficult to penetrate into a double structure, and inside the inner storage means, a heating element or a catalyst for generating heat when absorbing the hydrogen. A reactor containment vessel equipped with flammable gas processing equipment, wherein a part or both of a heating element that generates heat when absorbing hydrogen and a part of the catalyst are arranged. 8. The flammable fuel according to claim 7, wherein said inner storage means is brought into contact with an external catalyst to easily transfer heat generated inside said inner storage means to a catalyst provided outside. Reactor containment vessel equipped with reactive gas treatment equipment. 9. The flammable fuel according to claim 8, wherein the inner storage means is made of a material having good heat transfer, and heat generated inside the inner storage means is easily transmitted to a catalyst installed outside. Reactor containment vessel equipped with reactive gas treatment equipment. 10. The reactor containment vessel according to claim 9, wherein said internal containment means is configured to allow the atmospheric gas of said reactor containment vessel to easily pass therethrough.