JP4324640B1 - Marine mobile nuclear power plant - Google Patents

Abstract

[PROBLEMS] To provide a marine mobile nuclear power plant that has sufficient resistance to large impacts and stresses caused by natural disasters and does not require towing work for maintenance work such as avoidance of natural disasters or periodic inspections. Objective.
A semi-sub-type floating structure having a plurality of submersible floats, a plurality of columns and a platform each having a plurality of propulsors each independently rotatable in all directions, or a similar plurality A base-type floating structure with a base ship with a base propeller mounted on the bottom, a nuclear power generation facility mounted on this box platform or base ship and connected to land facilities by cable, and automatic ship position An offshore mobile nuclear power plant with a retention system. The nuclear power generation equipment may include at least a nuclear reactor, a steam turbine, a condenser, and a feed water pump, and other equipment necessary for power generation may be arranged as an onshore facility.
[Selection] Figure 1

Description

  The present invention relates to a marine mobile nuclear power plant having resistance to natural disasters such as earthquakes and tsunamis, and more particularly to a marine mobile nuclear power plant equipped with a propulsion device that can rotate in all directions.

  Conventional nuclear power plant facilities installed on land can withstand these natural disasters in order to ensure safety even in the event of a large impact or stress during natural disasters such as earthquakes, tsunamis, or typhoons. It is necessary to have sufficient strength and earthquake resistance. In the event of an accident, it is necessary to occupy a vast area around the nuclear power plant in order to reduce the damage caused by the leakage of radioactive materials. Furthermore, the construction of a nuclear power plant requires the consent of the landowner and a wide range of residents, making it difficult to establish a new location.

  Therefore, a construction method has been proposed in which a nuclear power generation facility is placed on a structure constructed on the sea with less locational restrictions than on land. Examples of the design of nuclear power generation facilities that are stationary offshore structures include artificial islands constructed in shallow water, artificial ground for landing floating structures constructed elsewhere, floating piers moored in shallow water, A ship-like structure is mentioned. However, even though artificial islands and artificial ground are not much different from ground facilities in impact and stress during earthquakes, the effects of tsunamis and typhoons during earthquakes are considered to be greater than normal land facilities. On the other hand, piers or ship-like floating structures have much smaller impacts and stresses during earthquakes than onshore facilities, but they are also most susceptible to the effects of typhoons and tsunamis because the structures also shake as the sea level rises and falls. There is a problem.

  Moreover, in order to ensure the safety of operation of nuclear power generation facilities, it is necessary to perform periodic inspections and maintenance work, and to change spent fuel for continuous operation. Since these operations take at least several months, it is inevitable to encounter stormy weather due to typhoons and seasonal winds during this period. Therefore, nuclear power generation equipment installed in stationary offshore facilities such as those described above has great technical difficulties in conducting inspections, maintenance and fuel replacement at sea while ensuring safety in stormy weather. It is difficult to secure sex.

  Therefore, for example, in Japanese Patent Application Laid-Open No. 5-87962, a nuclear power plant in which a nuclear power generator is mounted in a semi-submersible floating structure that is mostly in water and the cross-sectional area of the portion penetrating the water surface is smaller than the amount of drainage. Power generation facilities have been proposed. Such a semi-submersible floating structure has the advantage that even if it encounters a storm or tsunami on the open ocean, there is no risk of receiving a large stress or impact, and the safety of the structure itself is increased. Since most of the water is in the water, if an accident occurs, the impact of the accident directly affects seawater, increasing the risk of environmental pollution. In addition, this nuclear power generation facility can be towed to a construction / support facility to perform maintenance work, but extra time and cost are required to perform such towing work.

  Japanese Laid-Open Patent Publication No. 11-38172 discloses a marine floating body device equipped with a reactor building that houses a nuclear reactor system and a turbine building that houses a turbine system, and a platform equipped with the marine floating body device. A nuclear power plant has been proposed. The marine floating body device equipped with the reactor building that houses the reactor system and the turbine building that houses the turbine system is separated from the platform, and towed to a place with a dock facility that is equipped with inspection facilities, and is periodically inspected. be able to. However, it is a cumbersome task to separate the marine floating body apparatus equipped with the reactor building and turbine building from the platform at every periodic inspection, which requires a huge cost and is difficult to ensure safety. Therefore, it is desired to develop a marine mobile nuclear power plant that has sufficient resistance to natural disasters such as earthquakes, tsunamis, and typhoons, and that can perform maintenance work safely, quickly, and at low cost. .

Japanese Patent Application Laid-Open No. 5-87962 Japanese Patent Laid-Open No. 11-38172

  The present invention has been made in view of these disadvantages, and has sufficient resistance to large impacts and stresses caused by natural disasters such as earthquakes, tsunamis, and typhoons, and avoids natural disasters or performs maintenance such as periodic inspections. The purpose is to provide an offshore mobile nuclear power plant that does not require towing work.

The first aspect of the invention made to solve the above problems is as follows:
A plurality of submersible floats each having a plurality of propellers that can rotate independently in all directions, a plurality of submersibles attached to the submersible floats, submerged in the sea, and supported by the columns A semi-sub floating structure composed of open box platforms,
A nuclear power generation facility mounted on this box platform and connected to the land facility by cable;
An automatic ship position holding system,
The nuclear power plant installed on a box platform is a marine mobile nuclear power plant operated by a land facility.

  According to such a marine mobile nuclear power plant, a plurality of propulsors that can be independently rotated in all directions are provided with a plurality of underwater floats mounted on the bottom, and therefore within a range of 360 degrees. The nuclear power plant can be moved in any direction. Therefore, when a natural disaster such as an earthquake, tsunami, or typhoon occurs, or when maintenance work such as periodic inspection is necessary, the nuclear power plant can be easily moved to a desired location. In addition, the offshore mobile nuclear power plant includes a semi-sub-substructure composed of the underwater float, a plurality of columns attached to the underwater float and submerged in the sea, and a box platform supported by the column. By using a floating structure of the mold, it is possible to mitigate the effects of large impacts and stresses resulting from natural disasters, and have sufficient resistance to these. In addition, the offshore mobile nuclear power plant is particularly required to be resistant to natural disasters, for example, by placing nuclear power generation equipment connected to land facilities by cables on the top or inside of a box platform. It is possible to install only a system such as a nuclear reactor and install other facilities on land where maintenance and the like are easy and connect them with cables. Maintenance flexibility can be ensured. Further, the offshore mobile nuclear power plant can accurately maintain the current position by providing an automatic ship position maintaining system (DPS). In addition, since the offshore mobile nuclear power plant has a propulsion device, the nuclear power plant can be moved to a desired position when a natural disaster occurs or maintenance work is performed. In addition, by navigating the offshore mobile nuclear power plant to the coast of developing countries such as South America and Africa, it is possible to generate nuclear power only by developing land facilities. Can be contributed to.

The second aspect of the invention made to solve the above problems is as follows:
A trolley type floating structure having a trolley with a plurality of propulsors each independently capable of rotating in all directions mounted on the bottom;
A nuclear power generation facility mounted on this carriage and connected to the onshore facility by cable;
An automatic ship position holding system,
The nuclear power plant installed on a trolley is a marine mobile nuclear power plant operated by a land facility.

  According to such a marine mobile nuclear power plant, a plurality of propulsors each independently capable of rotating in all directions are provided with a base ship mounted at the bottom, so that any arbitrary range of 360 degrees is possible. The nuclear power plant can be moved in either direction. Therefore, when a natural disaster such as an earthquake, tsunami, or typhoon occurs, or when maintenance work such as periodic inspection is necessary, the nuclear power plant can be easily moved to a desired location. In addition, the offshore mobile nuclear power plant can mitigate the effects of large impacts and stresses caused by natural disasters by using a stand-type floating structure with multiple propellers mounted on the bottom. Yes, it has sufficient resistance to these. Further, the offshore mobile nuclear power plant includes the nuclear power generation facility connected to the land facility by a cable on the upper surface or inside of the carriage, and further includes an automatic ship position maintaining system (DPS). The first embodiment has the same operational effects as the offshore mobile nuclear power plant.

  In the marine mobile nuclear power plant according to the first or second aspect, the nuclear power generation equipment mounted on the box platform or the trolley includes at least a nuclear reactor, a steam turbine, a condenser, and a feed water pump, The nuclear power generation facility may be configured to be connectable with a cable between a land facility where other facilities necessary for power generation are arranged. Only the facilities that form the basic cycle of nuclear power generation, such as nuclear reactors, steam turbines, condensers and feedwater pumps that are particularly required to withstand natural disasters such as earthquakes, tsunamis, and typhoons are installed as offshore mobile plants; and By installing other facilities on land and connecting them with cables, it is possible to ensure safety against accidents and at the same time increase the flexibility of the design, operation and maintenance of nuclear power plants.

In the offshore mobile nuclear power plant according to the first or second aspect, the nuclear power generation equipment mounted on the box platform or the trolley is operated by the land facility. By operating the nuclear power generation facility using the operating system of the onshore facility connected to this offshore nuclear power generation facility with various cables, the takeover work of the replacement operation becomes smooth, and safer and more efficient operation is possible. Become. In addition, by installing facilities such as dormitories for replacement personnel, it becomes easier to manage the physical condition of the driver and secure manpower in an emergency.

  The automatic ship position maintaining system in the marine mobile nuclear power plant according to the first or second aspect preferably has a control function based on information from a GPS satellite. During normal operation of the offshore mobile nuclear power plant, it is desirable to maintain the same position for a long period of time because of the need for safe operation or reliable connection with onshore facilities. In such a case, the nuclear power plant is equipped with an automatic ship position maintenance system having a control function based on information from GPS satellites, so that the current position information is related to the operation of the propulsion unit so that the exact same position can be obtained. It is possible to stay.

  In the offshore mobile nuclear power plant according to the first or second aspect, the nuclear power generation equipment mounted on the box platform or the trolley is configured to be connectable to the land facility by a power transmission cable and / or a signal cable. It may be. When the nuclear power plant system is divided and installed on box-type platforms or trolleys, and onshore equipment (for example, only equipment that forms the basic cycle of nuclear power generation, such as nuclear reactors and steam turbines, is installed on the sea. When installing other systems on land), connecting the equipment between the sea and the land with transmission cables and / or signal cables as necessary, it is possible to supply power to reliable and stable demand areas and efficiently In addition, safe operation and maintenance work is possible.

  The semi-sub or pontoon type floating structure of the offshore mobile nuclear power plant according to the first or second aspect described above is provided with other offshore bases capable of inspecting, repairing and refueling nuclear power generation facilities. It may be configured to be connectable to a movable floating structure. When a marine base capable of inspecting, repairing and refueling nuclear power generation facilities is configured as a floating structure that is movable rather than stationary, a marine base configured as such a floating structure, By connecting to a semi-sub or carrier type floating structure on which a nuclear power plant is mounted, the travel distance and time of the nuclear power plant can be shortened, and maintenance work such as inspection and repair can be facilitated. Is promoted.

  In this specification, “propulsion unit” means a propulsion power unit provided in a floating structure at sea that can be rotated in any direction of 360 degrees, and includes what is called an azimuth thruster. It is. A plurality of propulsion devices can be operated independently. The “Automatic Positioning System” (abbreviation DPS) is based on information obtained from GPS satellites, sound wave generators installed on the bottom of the water, light wave generators installed on land, etc. It is a control system for specifying the "position" and at the same time predicting the direction and speed of wind and waves instantly and staying at a fixed point.

  In this specification, “underwater float” means that a plurality of propulsion devices are mounted at the bottom, and a box-type platform and a nuclear power generation facility mounted on this are installed through a plurality of columns submerged in the sea. It means an underwater type float with sufficient buoyancy to support it. “Boat” means a semi-submersible float equipped with several propulsion units at the bottom and capable of supporting nuclear power generation facilities. It is also called.

  In this specification, “the sea” includes a estuary basin of a river and a sea area partitioned from the open ocean by a peninsula or a cove-shaped topography. The “box platform” is supported by a column attached to the underwater float, and means a basic structure for mounting a group of facilities for nuclear power generation. It is made of concrete. Further, the “nuclear power generation facility” placed on a box platform or a trolley means at least a part of a series of facilities necessary for nuclear power generation (for example, a nuclear reactor, a steam turbine, etc.). Furthermore, “onshore facility” means a facility for performing power generation work in cooperation with “nuclear power generation equipment” placed on a trolley, and power generation equipment other than equipment placed on a trolley, It is a concept that includes an operation management room, an accommodation room for a driver, and the like. The “land facility” and the “cable” that is an interface between the land facility and the offshore mobile nuclear power plant are not included in the scope of the present invention.

  As described above, the offshore mobile nuclear power plant of the present invention can be moved in any direction within a range of 360 degrees, and when a natural disaster such as an earthquake, tsunami, or typhoon occurs. It is possible to easily move the nuclear power plant to a desired location. In addition, the offshore mobile nuclear power plant can alleviate the effects of large impacts and stresses caused by natural disasters, and has sufficient resistance to these.

1 is a schematic diagram showing a marine mobile nuclear power plant according to an embodiment of the present invention. It is a schematic diagram which shows the offshore mobile nuclear power plant which concerns on embodiment different from the nuclear power plant of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a schematic diagram showing an offshore mobile nuclear power plant according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing an offshore mobile nuclear power plant according to an embodiment different from the nuclear power plant of FIG. 1.

  The marine mobile nuclear power plant 1 in FIG. 1 mainly includes a semi-sub floating structure 2, a nuclear power generation facility 3, and a GPS receiver 4.

  The semi-sub-type floating structure 2 includes a plurality of propulsion devices 5, a plurality of underwater floats 6, a plurality of columns 7, and a box platform 8.

  A plurality of propulsion devices 5 are installed at the bottom of the underwater float 6 (in FIG. 1, a total of 8 units are illustrated for each of the two underwater floats on the front side and the back side of the paper). It can be rotated in the direction. By adjusting the direction and propulsive force of the plural propulsion devices 5, the semi-sub floating body structure 2 can be accurately and quickly moved to a desired position. The diameter of the propeller of the propulsion unit 5 is not particularly limited, but a propeller having a diameter of about 2 m or more and 10 m or less can be used depending on the scale of the nuclear power generation facility. A propeller having a propeller with a diameter of 3 m or more and 4 m or less is most common. Further, the number of installed propellers 5 is not particularly limited, but can typically be 4 or more and 16 or less. As shown in the figure, the propulsion devices 5 may be installed almost evenly on the bottom of the underwater float 6 or may be installed in the vicinity of one end. As a power source of the propulsion unit 5, an electric propulsion system in which an electric motor directly connected to a propeller is installed in the pod and electric power obtained from a generator 17 described later can be used. The marine mobile nuclear power plant 1 is provided with a plurality of propulsors 5 so that it can move in any direction at a desired speed. The propulsion speed of the offshore mobile nuclear power plant 1 can be arbitrarily adjusted. For example, the propulsion speed from about 5 km / hour to 30 km / hour can be set.

Each of the plurality of underwater floats 6 includes a plurality of propulsion devices 5 (four are illustrated in FIG. 1) at the bottom and a plurality of columns 7 semi-submerged at the top (four are illustrated in FIG. 1). Is installed. In FIG. 1, a total of two (two rows) underwater floats 6 are illustrated (the same underwater float is also installed on the back side of the paper). The underwater float 6 has a buoyancy enough to suspend a plurality of propulsion units and support a plurality of columns, a box-type platform and a nuclear power generation facility in combination with itself and a column 7 which will be described later. Need to be. As the underwater float 6, a buoyancy body called a lower hull having a hollow portion inside is used (see, for example, Japanese Patent Application Laid-Open No. 2001-71991). The underwater float 6 has a ballast tank and is configured so that the buoyancy can be adjusted by the amount of water in the tank. In the underwater float 6, the hollow portion may be divided into a plurality of chambers by partition walls so that buoyancy fluctuation can be suppressed to a minimum even in the event of damage. Examples of the material of the underwater float 6 include seawater-resistant steel, alloys, stainless steel, and the like, but these metals can be used in combination with synthetic resins and glass reinforcing fibers as appropriate. The outer wall of the underwater float 6 is preferably reinforced with seawater resistance by painting. As the size of each of the water float 6 may be, for example, 2 × ¹⁰ 4 ^{m 3} or more 2 × ¹⁰ 5 ^{m 3} or less.

  A plurality of columns 7 are installed on each of the underwater floats 6 and support the box-type platform 8 and the nuclear power generation equipment 3 mounted thereon. In FIG. 2, four columns 7 installed for each of the underwater floats 6 are illustrated (the description of the columns installed in the underwater floats on the back side of the paper surface is omitted). The column 7 has enough strength to suspend a plurality of propulsion devices and support a plurality of columns, a box platform, and a nuclear power generation facility, together with the underwater float 6 described above. Need to be. Each of the columns 7 has at least one hollow portion inside, through which an elevator, stairs, piping space and ventilation inside the underwater float for attaching / detaching the propeller and accessing between the box platform and the underwater float. A ventilation device or the like may be provided. As the material of the column 7, the same material as the underwater float 6 can be used. The cross-sectional shape of the floating column 7 is not particularly limited, but is preferably a circle or an ellipse from the viewpoint of improving resistance to waves. Further, the size of the cross section of each column can be, for example, about 3 m to 20 m in diameter and 15 m to 80 m in length when the cross-sectional shape is circular.

The box platform 8 is supported by a plurality of underwater floats 6 and a plurality of columns 7 and constitutes a substrate of a nuclear power generation facility 3 to be described later. The box platform 8 is mainly formed of steel and concrete. The area and average thickness of the box platform 8 are not particularly limited as long as the nuclear power generation facility 3 can be stably mounted. For example, the area of the box platform 8 can be about 4 × 10 ⁴ m ² or more and 1 × 10 ⁶ m ² or less, and the average thickness can be about 10 m or more and 50 m or less. Moreover, the shortest distance H between the bottom surface (lowermost part) of the platform and the sea surface (sea surface at the time of still water) can be 8 m or more and 20 m or less, preferably 10 m or more and 15 m or less. Although the maximum tsunami wave height is around 30 m, it varies depending on the sea area, so it is desirable to set H in consideration of the wave height of the sea area to be installed. In addition to the nuclear power generation facilities 3 (including piping groups connecting each facility) described later, the box-type platform 8 includes accommodation facilities for operators and maintenance workers, seawater desalination equipment, helicopter landings, jetty, Various cranes may be provided.

  The nuclear power generation facility 3 includes a nuclear reactor 9, an auxiliary machine 10 around the nuclear reactor, a steam turbine 11, a generator 12, a condenser (condenser) 13, a feed water pump 14, a water intake pipe 15, a drain pipe 16, and an operation management room 17. Have Further, the nuclear power generation equipment 3 and the onshore facility (not shown) are connected by a power transmission cable 18 and a signal cable 19 which are interfaces.

  The nuclear reactor 9 contains a fuel assembly containing fuel rods in a reactor pressure vessel, a control rod for controlling the chain reaction of nuclear fission, and an air-water mixture stream heated by heat generated by the nuclear fission as moisture. It has a steam separator that separates into steam. As nuclear fuel, uranium 235 and plutonium 239 are generally used. The auxiliary machine 10 around the nuclear reactor is an auxiliary device group related to the operation of the nuclear reactor 9. The steam turbine 11 converts the thermal energy of the steam generated in the reactor pressure vessel into kinetic energy by rotating the turbine, and then supplies the energy to the generator 12. The steam turbine 11 is controlled by a pressure control system that controls the reactor pressure and a speed control system that controls the turbine speed. The generator 12 generates electric energy (electric power) from the kinetic energy supplied from the steam turbine 11. The thermal efficiency of nuclear power is generally about 30%. The adjustment of the power generation amount in nuclear power generation is mainly performed by recirculation flow rate control for adjusting the reactor output and turbine control for controlling the output of the generator by controlling the amount of steam supplied to the turbine. The electric power generated from the generator 12 is sent to the demand area through the power transmission cable 18 through the transformer facilities.

  The condenser (condenser) 13 condenses the steam generated from the steam turbine, and the feed water pump 14 supplies the water condensed by the condenser 13 to the reactor 9 again. The condenser 13 acquires seawater from the intake pipe 15 as a cooling medium, and discharges the seawater heated by using it for cooling the steam from the drain pipe 16. The operation management room 17 is connected to a land facility having an operation system of the nuclear power generation equipment 3 by a signal cable 19 during normal operation, and is organically connected to each device in the equipment. In addition, the operation management room 17 is configured so that operation and management can be performed directly by an operator from there. The operation management room 17 has a function of performing operation control of each of the plurality of propulsion devices 5 in addition to the operation and management of the nuclear power generation facility 3.

  As the power transmission cable 18 and the signal cable 19 connected to the land facility, known ones can be used, and a part thereof may be buried or laid on the seabed as necessary. Each of the power transmission cable 18 and the signal cable 19 has a connection portion (not shown) between the cables at appropriate locations, and when a natural disaster such as an earthquake, a tsunami, or a typhoon occurs, or maintenance work such as periodic inspection is performed. It is good to comprise so that a cable can be parted from the connection part at the time of movement, such as required. When the power transmission cable 18 and the signal cable 19 have such a connection portion, when the marine mobile nuclear power plant 1 needs to be moved quickly, it is possible to prepare a state of being able to move quickly.

  The piping of the process fluid that connects between each part of the nuclear power generation equipment 3 and between the nuclear power generation equipment 3 and other equipment necessary for power generation included in the onshore facility is known carbon steel or alloy steel having seawater resistance. Can be used. In addition, the process fluid piping connecting between the nuclear power generation equipment 3 and other equipment included in the onshore facility can absorb the impact of waves as long as heat resistance against high temperature fluid can be secured. It is preferable to use a flexible propylene-based resin pipe (for example, a resin composition containing a propylene resin, inorganic particles, and a rubber component as described in JP-A-2007-39474). In addition, the joint of the process fluid piping that connects between the nuclear power generation equipment 3 and other equipment included in the onshore facility must be flexible enough to withstand vibrations caused by waves. It is preferable to use a nonmetallic expansion joint having sufficient heat resistance. As such a joint, a cylindrical double conduit, a connector for connecting these two conduits, an airtight layer for preventing fluid from leaking to the outside, and an outer layer for supplementing the strength of the airtight layer It is possible to use a joint made of a cylindrical non-metallic laminated stretchable material laminated with a reinforcing layer (see, for example, JP-A-2001-263562). As the material of such an airtight layer, an elastomer material such as polytetrafluoroethylene, fluorine rubber, butyl rubber, chloroprene rubber, silicon rubber, or the like can be used. Moreover, as a material of this reinforcement layer, polyparaphenylene benzobisoxazole fiber, polyparaphenylene benzobisthiazole fiber, aramid fiber, etc. can be used.

  The GPS receiver 4 is a system capable of accurately grasping the current position by receiving a signal from a GPS satellite using a global positioning system (GPS: Global Positioning System). . DPS (not shown) specifies the "current position of the ship" based on data obtained from GPS satellites, and at the same time, controls for instantaneously predicting the direction and speed of wind and waves and staying at a fixed point It has a mechanism. When a natural disaster such as an earthquake occurs, or when maintenance work such as periodic inspections is necessary, when moving the offshore mobile nuclear power plant 1, it is possible to know the exact current position of this plant, Rapid movement is possible. In addition to data obtained from GPS satellites, DPS can identify the “current position of a ship” based on information obtained from a sound wave generator installed at the bottom of the water or a light wave generator installed on land. It may be configured.

  The offshore mobile nuclear power plant of the present embodiment can move safely and quickly in any direction of 360 degrees, and in addition, by operating each propulsion unit independently, the direction and speed can be adjusted slightly. Adjustment is possible. Therefore, when a natural disaster such as an earthquake, tsunami, or typhoon occurs, or when maintenance work such as periodic inspection is required, the nuclear power plant can be easily moved to a safe area or a place where an inspection dog is installed. It becomes possible. In addition, since the offshore mobile nuclear power plant is equipped with a nuclear power generation facility on a semi-sub floating structure floating on the sea, it is possible to mitigate the effects of large impacts and stresses caused by natural disasters. It has sufficient resistance to it. In addition, since the offshore mobile nuclear power plant has a configuration in which functions are divided into offshore facilities and onshore facilities and these are connected by cables, the design, operation, and maintenance of the plant can be performed flexibly. . Further, the offshore mobile nuclear power plant can accurately move and hold the nuclear power plant up to a desired position or the current position by providing a DPS having a control function based on information from GPS satellites. Is possible.

  The ocean mobile nuclear power plant 20 in FIG. 2 mainly includes a carrier type floating structure 21, a nuclear power generation facility 22, and a GPS receiver 23.

  The trolley type floating structure 21 includes a plurality of propulsion devices 24 and a trolley 25.

  The plurality of propulsion devices 24 are the same as the plurality of propulsion devices 5 in the above embodiment except that they are mounted on the bottom of the carriage 25. In FIG. 2, a total of eight propulsion devices 24 in two rows are illustrated (the description of four propulsion devices in the row on the back side of the drawing is omitted).

A plurality of propulsion devices 24 (eight examples are illustrated in FIG. 2) are installed on the bottom of the trolley 25. The trolley 25 needs to have a buoyancy enough to suspend a plurality of propulsion devices and support a nuclear power generation facility. As the carrier 25, a single structure having a ballast trunk capable of adjusting buoyancy by the amount of water and partitioned into a large number of hollow portions by a partition wall is used. Further, instead of such a single structure, hollow block bodies of the same size may be arranged and connected in a predetermined arrangement with a predetermined interval in a semi-submersible type (for example, JP 2008-95417 A). No. publication). Examples of the material of the trolley 25 include steel, alloys, and stainless steel having seawater resistance, as in the case of the underwater float 6 in the above embodiment. It can also be used in combination with fibers. The outer wall of the trolley 25 is preferably reinforced with seawater resistance by painting. As the size of the barge 25, for example, it is a 1 × ¹⁰ 6 ^{m 3} or less 1 × ¹⁰ 5 ^{m 3} or more. The trolley 25 preferably has fuel as an auxiliary drive source for the propeller 24 and a tank for mounting.

  The nuclear power generation facility 22 includes a nuclear reactor 26, an auxiliary machine 27 around the nuclear reactor, a steam turbine 28, a generator 29, a condenser 30, a feed water pump 31, a water intake pipe 32, a drain pipe 33, and an operation management room 34. Have Further, the nuclear power generation facility 22 and the onshore facility (not shown) are connected by a power transmission cable 35 and a signal cable 36 which are interfaces. Each facility, the power transmission cable 35, the signal cable 36, the GPS receiver 23, and the piping between the facilities included in these nuclear power generation facilities 22 are the reactor 9, the auxiliary equipment 10 around the reactor, and the steam in the above embodiment. Turbine 11, generator 12, condenser (condenser) 13, feed water pump 14, intake pipe 15, drain pipe 16, operation management room 17, power transmission cable 18, signal cable 19, and GPS receiver 4, and between each equipment Since the same pipes can be used, description thereof is omitted here.

  The offshore mobile nuclear power plant of this embodiment has the same advantages as those of the above embodiment. In other words, this offshore mobile nuclear power plant can move safely and quickly in any direction of 360 degrees, and by operating each propulsion unit independently, it is possible to finely adjust the direction and speed. is there. Therefore, when a natural disaster such as an earthquake, tsunami, or typhoon occurs, it is possible to easily move the nuclear power plant to a safe area or a place where an inspection dog is installed. In addition, since the offshore mobile nuclear power plant includes a nuclear power generation facility on a stand-type floating structure floating on the sea, it is possible to mitigate the effects of large impacts and stresses caused by natural disasters. In addition, since the offshore mobile nuclear power plant has a configuration in which functions are divided into offshore facilities and onshore facilities and these are connected by cables, the design, operation, and maintenance of the plant can be performed flexibly. . Furthermore, the offshore mobile nuclear power plant can accurately move and hold the nuclear power plant up to a desired position or the current position by providing a DPS that operates based on information from GPS satellites. .

  The offshore mobile nuclear power plant according to the present invention is not limited to the above embodiment. This offshore mobile nuclear power plant is configured so that a semi-sub or pontoon type floating structure can be connected to other floating structures equipped with a marine base for inspection, repair, refueling, etc. of nuclear power generation facilities. It may be. Inspection, repair, fuel at any position without the need to move to a land or marine stationary base by having a semi-sub or carrier type floating structure itself connected to other mobile floating structures. It is possible to perform work such as replacement. In addition, in the case where another floating structure equipped with such a marine base is also provided with a plurality of propulsion devices, the offshore mobile nuclear power plant according to the present invention and other mobile floating structures Can be connected quickly. The connecting means is not particularly limited as long as the semi-sub or floating type floating structure can be reliably connected to the other floating structure. For example, the box type platform or the flat ship of both or one floating structure can be used. A means of bridging the main steel bridge built in the can be considered.

  The nuclear power generation equipment mounted on the box platform or the trolley of the offshore mobile nuclear power plant according to the present invention is not limited to the reactor, steam turbine, condenser, and feed pump system, for example, the nuclear reactor. In addition, only the steam turbine system may be provided as an offshore facility, and other facilities may be provided as an onshore facility.

  The offshore mobile nuclear power plant of the present invention has sufficient resistance to natural disasters such as earthquakes, tsunamis, typhoons, etc., so that the safety of operation is enhanced and stable and peaceful power supply to the public is possible. Become. In addition, since the offshore mobile nuclear power plant can be moved to a distant area, it can greatly contribute to the international community.

1 Marine mobile nuclear power plant 2 Semi-sub floating structure 3 Nuclear power generation facility 4 GPS receiver 5 Propeller 6 Underwater float 7 Column 8 Box platform 9 Reactor 10 Reactor auxiliary 11 Steam turbine 12 Generator 13 Condensate Equipment 14 Water supply pump 15 Intake pipe 16 Drain pipe 17 Operation management room 18 Transmission cable 19 Signal cable H Shortest distance between bottom surface of box-type platform and sea surface 20 Marine mobile nuclear power plant 21 Cargo floating structure 22 Nuclear power generation facility 23 GPS receiver 24 propulsion unit 25 ship 26 reactor 27 reactor auxiliary 28 steam turbine 29 generator 30 condenser 31 feed pump 32 intake pipe 33 drain pipe 34 operation control room 35 power transmission cable 36 signal cable

Claims (6)

A plurality of submersible floats each having a plurality of propellers that can rotate independently in all directions, a plurality of submersibles attached to the submersible floats, submerged in the sea, and supported by the columns A semi-sub floating structure composed of open box platforms,
A nuclear power generation facility mounted on this box platform and connected to the land facility by cable;
An automatic ship position holding system,
An offshore mobile nuclear power plant in which the nuclear power generation equipment mounted on a box platform is operated by a land facility . A trolley type floating structure having a trolley with a plurality of propulsors each independently capable of rotating in all directions mounted on the bottom;
A nuclear power generation facility mounted on this carriage and connected to the onshore facility by cable;
An automatic ship position holding system,
An offshore mobile nuclear power plant in which the nuclear power plant installed on a trolley is operated by a land facility .   A nuclear power plant installed on a box platform or a trolley includes at least a nuclear reactor, a steam turbine, a condenser and a feed water pump, and this nuclear power plant and other facilities necessary for power generation are arranged on land. The offshore mobile nuclear power plant according to claim 1 or 2, wherein the facility is connected by a cable. The offshore mobile nuclear power plant according to claim 1, 2 or 3 , wherein the automatic ship position maintaining system has a control function based on information from a GPS satellite. The offshore mobile nuclear power generation according to any one of claims 1 to 4, wherein the nuclear power generation equipment mounted on the box platform or the trolley is connected to the land facility by a power transmission cable and / or a signal cable. plant. Floating structures Semisabu type or platform hull is inspection of nuclear power plants, repair, claim from claim 1 to be carried out refueling is connected to other mobile floating structure provided with a sea base capable The offshore mobile nuclear power plant according to any one of 5 .

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