JP2012233726A - External power source and plain water receiving facility, power source and plain water supply ship, and power source and plain water supply system comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nuclear power plant that can avoid all power supply loss and coolant loss or prevent damage due to coolant-loss accident from spreading even when a power facility on land is lost.SOLUTION: An external power source and a plain water receiving facility installed in a harbor in an atomic power plant or in offing where they are hard to be damaged by tsunami include an electricity receiving terminal of the external power source connected to the atomic power plant and a plain water supply port where electricity and plain water are supplied to the atomic power plant from a ship for supplying power and plain water including a power generation facility and plain water pool tank.

Description

  The present invention relates to a nuclear power plant located on the coast, and relates to a technology capable of supplying electricity and fresh water in case of power loss in the power plant.

  At a nuclear power plant, electricity is generated and transmitted to the outside, while electricity is used to operate a nuclear reactor and store spent fuel. At a nuclear power plant, water is heated to high temperature using the thermal energy generated by nuclear fission in the nuclear reactor, and the turbine is rotated using water vapor generated in the nuclear reactor or in the steam generator. ing. Water vapor used for power generation is returned to water by a condenser that pumps and circulates cooling water such as seawater, and returns to the reactor or steam generator by a pump. Water in the reactor is circulated with a recirculation pump or an internal pump. It is also circulated using a pump to purify the water in the reactor. Furthermore, in the spent fuel storage tank in the nuclear power plant, heat is exchanged by circulating water in the storage tank with a pump in order to cool the spent fuel. In addition to the operation of such pumps, electricity is also used for reactor monitoring and control.

  Normally, the electricity used in the power plant is supplied by electricity generated by the reactor, but after the nuclear fission reaction is stopped using the control rod, the residual heat removal system (also called residual heat removal equipment), etc. Because it is necessary to continuously cool the nuclear reactor and spent fuel by circulating water at the plant, electricity generated by another nuclear reactor in the power plant or electricity supplied from outside the power plant is used. Yes. For the supply of electricity from outside the power plant, land facilities such as the power transmission system of the power plant are used. In addition, even if the reactors in the power plant shut down all at once and the supply of electricity from the outside is interrupted, the design will supply electricity that requires emergency power such as diesel generators and batteries in the power plant. ing.

  The water that cools the reactor is high-purity water in a boiling water reactor, and pure water to which boron or lithium ions are added in a pressurized water reactor, and is cooled through a heat exchanger. If the cooling water in the reactor is lost due to leakage, etc., the decay heat of the fuel cannot be removed, causing the fuel to melt and damage, resulting in a serious situation. Equipment that becomes the cooling water pressure boundary such as pressure vessels and piping Careful management of damages is constantly implemented.

  In the spent fuel storage tank, cooling water is circulated to remove decay heat of the spent fuel, and the temperature is normally maintained at around room temperature. Moreover, even if the cooling water is reduced due to evaporation or the like, it is replenished from the pure water producing machine in the power plant.

  As a means for preventing the loss of all power sources in a nuclear power plant, an emergency power supply is received from a nuclear power plant adjacent to JP-A-7-167986, JP-A-8-251841 and JP-A-11-94988. A power supply facility is disclosed.

  Japanese Laid-Open Patent Publication No. 5-341993 discloses a method of using an emergency power supply device installed in a spent fuel pool as a portable type and diverting it to an emergency power supply for other equipment.

  Japanese Patent Laying-Open No. 2005-227017 discloses a DC power supply system that efficiently supplies an emergency DC power supply.

  As a future reactor structure, for example, Japanese Patent Laid-Open No. 8-285983 discloses a method in which a water tank of an emergency core cooling facility is disposed at the upper part of a nuclear reactor and cooling water can be supplied to the core without supplying water by a pump. ing.

JP-A-7-167986 JP-A-8-251841 JP-A-11-94988 Japanese Patent Laid-Open No. 5-341093 JP 2005-227017 A JP-A-8-285983

  In the event of a major disaster, nuclear power plants need to have many safety backup measures in order to safely stop and stabilize them without causing a serious nuclear accident.

  External power from land may be lost due to large-scale power outages due to earthquakes, etc., and it may take time to recover due to damage to power transmission and substation facilities. In the nuclear reactor in the power plant, in the event of an emergency such as an earthquake, control rods are inserted all at once and the reactor is shut down to stop power generation. Therefore, in case the external power supply is lost and all reactors in the power plant stop generating power, the power plant such as cooling the nuclear reactor and spent fuel storage tanks with an emergency power source such as a diesel generator in the power plant. Necessary power will be provided. However, due to a major earthquake or tsunami, power supply equipment on the ground is damaged and cannot be operated, and measures are required to prevent the loss of the cooling function of the nuclear reactor and spent fuel storage tank due to the loss of all power sources. For example, after the emergency diesel generator becomes inoperable, it is necessary to secure an alternative power source within the time when the necessary minimum function is maintained with the power from the emergency battery.

  In addition, the cooling water in the nuclear reactor and spent fuel storage tank must be replenished when it is reduced due to leakage from equipment or evaporation due to loss of cooling function. If the power source in the power plant is lost, it can be supplied from a pure water storage tank using an external pump for a short time, but if there is no fresh water source, the nuclear power plant located on the coast In some cases, seawater will be supplied while fearing the corrosion of the materials that make up the equipment.

  In the event of a disaster such as a major earthquake or tsunami, the access road on the ground may be cut off due to rubble accumulation, cracking, etc., and it may take time to recover, and large facilities cannot be transported. Under such circumstances, it is assumed that it is difficult to restore the power source of the nuclear power plant in a short time by dispatching a vehicle such as a power supply vehicle to the nuclear power plant.

  At a nuclear power plant located on the coast, there is a means of transporting generators by ship using the harbor facilities installed at the power plant, but when the harbor facilities are destroyed by an earthquake or tsunami, It is also assumed that the land cannot be landed. In particular, the destructive power caused by tsunamis increases as the water depth decreases and may increase the tide level and cause severe damage to harbor facilities.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a nuclear power plant capable of avoiding the loss of all power sources and the loss of cooling water or preventing the spread of damage due to a loss accident even when the onshore power supply facility is lost.

  The nuclear power plant of the present invention has a facility having a terminal of an external power source connected to the nuclear power plant and a fresh water supply port offshore of the nuclear power plant that is not easily damaged by the tsunami. It is characterized in that electricity and fresh water are supplied to the nuclear power plant via the equipment from a ship capable of storing and supplying fresh water.

  According to the present invention, when a nuclear power plant loses an on-shore external power source and an emergency power plant power source due to a disaster, it does not directly connect to a port facility that may lose its function. As a result, it is possible to supply fresh water, and as a result, it is possible to avoid the loss of all power sources of the nuclear power plant and the loss of cooling water, or to prevent the damage caused by the loss accident.

It is a figure which shows the example of installation of the external power supply of this invention, a fresh water receiving installation, and a connection path | route. It is a schematic diagram of the external power supply installed in the offshore of the present invention as a marine structure and fresh water receiving equipment. It is a schematic diagram of the external power supply installed in the offshore of this invention as a submarine building, and a freshwater receiving installation. It is a figure which shows the structure of the underground tunnel installed as an underground connection path | route of this invention. It is a figure explaining the cable pool installed in the underground connection path | route of this invention. It is a figure which shows the water supply piping bending part structure of this invention. It is a figure which shows the power supply and fresh water supply ship of this invention. It is a figure which shows the power supply and freshwater water supply connection part structure in the external power supply of this invention, and a freshwater receiving installation. It is a figure which shows the supply pipe connection operation | work from the power supply and freshwater supply ship of this invention to an external power supply and freshwater receiving equipment. It is a figure which shows arrangement | positioning of the external power supply terminal and freshwater supply port in the external power supply and freshwater receiving installation of this invention. It is a schematic diagram of an external power source and fresh water receiving equipment installed as a submarine structure offshore of the present invention and provided with a floating structure.

  The present invention relates to maintenance of safety of a nuclear power plant located on the coast, and relates to a power source and a fresh water supply system capable of avoiding loss of total power and cooling water of a nuclear power plant in the event of a disaster.

  The present invention provides a power source and a fresh water supply system for supplying electricity and fresh water from a ship to a nuclear power plant via an external power source and a fresh water receiving facility installed at a harbor or offshore of a nuclear power plant.

  The external power supply and fresh water receiving facility of the present invention are installed in a harbor of a nuclear power plant or offshore that is not easily damaged by a tsunami, and have a receiving terminal of an external power source connected to the nuclear power plant, more preferably a fresh water supply port. Electric power, preferably fresh water, is supplied to the nuclear power plant from a power generation facility, more preferably a power source having a fresh water storage tank and a fresh water supply ship.

  The external power source and the fresh water receiving facility of the present invention are installed offshore so that the damage of the tsunami can be kept relatively small, and the power source and the fresh water supply ship can be further connected to the nuclear power plant without touching the damaged port facility. Fresh water can be supplied.

  The external power supply and fresh water receiving facility of the present invention is characterized in that the connection path to the nuclear power plant has a power cable and a water supply pipe embedded in the seabed.

  By embedding a power cable and a water supply pipe in the ground at the sea bottom as a connection path between the external power source and fresh water receiving facility of the present invention and the nuclear power plant, it is possible to prevent a tsunami from breaking near the coast.

  The external power source and the fresh water receiving facility of the present invention are such that the connection path to the nuclear power plant protects the power cable, water supply pipe with a concrete pipe, a metal pipe with anticorrosion treatment, or a reinforced resin, and is installed on the sea floor. Features.

  As a connection path between the external power source and fresh water receiving facility of the present invention and a nuclear power plant, damage caused by a tsunami is estimated, and a power cable and a water supply pipe are connected at a place where damage is relatively unlikely due to the tsunami, for example, offshore. By protecting with concrete pipes, anti-corrosion metal pipes or reinforced resin, and installing on the sea floor, the facility cost can be reduced.

  Two or more external power sources and fresh water receiving facilities according to the present invention are installed in a nuclear power plant, and are connected to each other and connected to the nuclear power plant through a plurality of paths.

  By installing a plurality of external power sources and fresh water receiving facilities and coupling them to each other, electricity and fresh water can be supplied to the nuclear power plant from a plurality of routes even if some of the facilities cannot be used.

  The external power supply and fresh water receiving facility of the present invention are characterized in that they are connected to a tidal power generation facility installed on the sea.

  By connecting to a tidal power generation facility or wave power generation facility installed at sea, electricity can be supplied even if the power source and the freshwater supply ship do not arrive.

  The external power supply and the fresh water receiving facility of the present invention have a structure that can be connected to a terminal of an external power source or a fresh water supply port from a ship that is usually in the sea so that the ship can berth. It is characterized by being a submarine structure.

  By making the external power supply and fresh water receiving equipment a marine structure based on the bottom of the sea so that the ship can come to the berth, the lighthouse is usually turned on from the power cable to alert the navigation of the ship. The connection work to the external power receiving terminal and the fresh water supply port can be facilitated.

  The external power supply and fresh water receiving facility of the present invention is a floating structure that is usually in the sea and installed in a submarine structure, and has an external power supply receiving and fresh water supply facility with a terminal of the external power source or a fresh water supply port. It is characterized by buoyancy obtained by gas filling in floating or supplying forced drainage from a tank when supplying an external power source and fresh water, or being lifted by a ship and ascending to the sea and receiving an external power supply and fresh water from the ship.

  By making the external power supply and freshwater receiving equipment a submarine structure that is usually in the sea and can be connected from the ship to the terminal of the external power supply or the freshwater supply port, damage due to waves can be suppressed. The facility can be installed offshore close to. In addition, in an external power supply and freshwater receiving facility for a submarine structure, a floating structure with an external power supply receiving and freshwater supply facility equipped with an external power supply terminal or freshwater supply port will float when supplying external power and freshwater. The buoyancy obtained by gas filling or forced drainage from the tank or by lifting the vessel to float on the sea makes it easy to connect the power supply and freshwater supply ship to the external power supply terminal or freshwater supply port. it can.

  The connection path in which the power cable and the water supply pipe are buried in the ground of the seabed of the present invention is an underground tunnel structure having a wall thickness corresponding to the assumed earthquake motion, and the equipment, power cable or It is provided with a detector that can remotely detect breakage of the water supply pipe.

  The connection route with power cables and water supply pipes buried in the seabed connecting the offshore external power supply and fresh water receiving equipment to the nuclear power plant is an underground tunnel structure with a wall thickness corresponding to the assumed earthquake motion. In addition to preventing the deterioration of the power supply cable and the water supply pipe, it is possible to provide a seismic resistance and maintainability.

  The connection path of the present invention is provided with a cable reservoir for storing a cable for securing a power cable length at a predetermined interval in preparation for a ground change due to an earthquake or the like, or a bellows pipe made of a flexible material It is characterized in that the water supply pipe is bent in advance at the section.

  Install cable reservoirs to store cables for securing the power cable length at predetermined intervals in the connection path connecting the offshore external power supply and freshwater receiving equipment to the nuclear power plant, or flexible materials By bending the water supply piping in advance at the bellows piping section, it is possible to prevent damage to the power supply cable and the water supply piping with respect to ground changes due to earthquakes or the like.

  The power supply and fresh water supply ship of the present invention has a power generation facility capable of supplying fuel necessary for power generation not only from its own fuel tank but also from other ships, and can preferably receive water supply from other ships. It has a fresh water storage tank and a water pump, and supplies electricity and fresh water to an external power source and fresh water receiving equipment.

  The power supply and fresh water supply ship has a power generation facility capable of supplying fuel necessary for power generation not only from its own fuel tank but also from other ships, and preferably a fresh water storage tank capable of receiving water supply from other ships. By having the water pump, the fuel and fresh water can be continuously supplied from other ships, and electricity and fresh water can be continuously supplied to the nuclear power plant.

  The external power supply and fresh water connection structure of the present invention is a connection brought in from a power supply and a fresh water supply ship by making the shape of the external power supply receiving terminal and the fresh water supply opening in the fresh water receiving facility into a conical shape. It has a structure that is fixed by pressing the part against the mouth.

  The external power receiving terminal and the fresh water supply receiving port in the external power supply and fresh water receiving facility are conical in shape and fixed by pressing the connection brought in from the power supply and fresh water supply ship to the receiving port. By adopting a structure, the target position of the receiving port from the power supply and fresh water supply ship becomes large when workers land due to the influence of radiation etc. and cannot work for a long time, so it can be connected in a short time even by remote operation Can perform work.

  The power source and fresh water supply system of the present invention are provided in a port where the power source and the fresh water supply ship can arrive at the nuclear power plant within the time that the DC power source can be maintained after the loss of the AC power source, and a port remote from the target nuclear power plant. It is characterized by being maintained at the same time.

  A power and freshwater supply ship will be installed in a port where it can reach the nuclear power plant within the time that the DC power can be maintained after the loss of all AC power. After that, electricity and fresh water can be supplied to the nuclear power plant within a short time. In addition, a power supply and freshwater supply ship will be installed at a port remote from the target nuclear power plant at the same time. Even if the supply ship becomes unusable, it is possible to prevent the damage from spreading due to the loss of all power sources.

  By the measures of the present invention described above, when a nuclear power plant loses an onshore external power source and an emergency power plant power source due to a disaster, it avoids the loss of all power sources of the nuclear power plant and the loss of cooling water or prevents the spread of damage. can do.

  Fig. 1 shows an example in which an external power source and fresh water receiving equipment are installed at a nuclear power plant located on the coast. The port 2 attached to the nuclear power plant has a water depth of 13 m or more, and usually allows relatively large cargo ships to berth. Two external power sources and fresh water receiving facilities (port facilities) 7 that can supply external power and fresh water from the ship were also installed in the harbor 2. This is because an external power source and fresh water are supplied by the ship from the harbor 2 closer to the nuclear power plant. Three external power sources and freshwater receiving facilities (submarine buildings) 8 and external power sources and freshwater receiving facilities (marine buildings) 9 were installed in offshore 3 at different distances from the port.

  In consideration of the tsunami and the damage caused by the large tsunami, it was installed on the ocean floor deeper than 20m. An external power source and fresh water receiving facilities 8 and 9 were connected to the nuclear power plant by an underground connection path 10 through a power cable and a water supply pipe through an underground tunnel having a depth of 25 m. In the external power supply and fresh water receiving facility 8 installed at a depth of more than 25 m, the power cable and the water supply pipe are taken out from the underground connection path 10 to the sea floor, and are made into a rust-proof metal pipe protected by a resin cover. They were connected by a submarine connection path 11 through them.

  Five external power sources and fresh water receiving facilities 7, 8, and 9 were directly connected to the nuclear power plant and connected to each other. As a result, the external power source and the fresh water receiving facility 7, 8 and 9 are connected to the nuclear power plant through a plurality of routes, and even if one of the routes connected to the nuclear power plant is damaged and cannot be used, Electricity or fresh water can be supplied from the external power source and the fresh water receiving facility 7, 8, 9 using the route. It should be noted that the external power supply and fresh water receiving facilities, such as port facilities, submarine structures, and offshore structures, may be installed as appropriate without being installed.

  FIG. 2 shows two external power supplies and fresh water receiving equipment 9 apart from the harbor. The two external power sources and the freshwater receiving facility 9 apart from the harbor were sea structures based on the sea floor as shown in FIG. Usually, the lighthouse 19 is turned on from the power cable to alert the ship to avoid collision with the ship. The structure is such that the ship can berth and workers can land on the berthing / work floor 17 and can easily connect to the external power receiving terminal and fresh water supply port in the power receiving and fresh water supply connection facility 9. it can.

  FIG. 3 shows the external power supply and fresh water receiving facility 8 closest to the harbor. As shown in FIG. 3, the external power supply and fresh water receiving facility 8 closest to the harbor is usually in the sea and can be connected from a ship to the terminal of the external power supply or fresh water supply port in the fresh water supply connection facility 8 from the ship. The undersea building 8 This prevents it from being destroyed by waves. A buoy 21 connected to the submarine structure 8 is floated on the sea surface on the underwater structure by a buoy connection rope 22 so that the position of the facility can be easily understood. The buoy is illuminated by a battery so that it can be recognized at night. Even if the buoy 21 is lost, the location of equipment can be confirmed by the global positioning system and underwater ultrasonic flaw detection technology.

  In order to send external power or fresh water from offshore external power and fresh water receiving facilities 8 and 9 to the Nuclear Power Award, underground power cable or piping connecting the nuclear power plant from the external power and fresh water receiving facilities 8 and 9 Has been devised from the viewpoint of preventing cable or pipe deterioration and ensuring earthquake resistance and maintainability.

  FIG. 4 shows a reinforced concrete underground tunnel room 101 used as the underground connection path 10. Cables and piping were laid individually or together in this. At this time, there is a method of laying them in the same space, but the underground tunnel room 101 is further divided into two stages, the upper part is routed through the underground power cable 103 for securing the offshore external power supply, and the lower part is secured for fresh water supply at sea. The underground fresh water supply pipe 104 is routed through, and a space for maintenance is secured in each. In this measure, there is a method in which both chambers are separated by a lockable lid 105 when a hole is provided to go back and forth between the upper stage and the lower stage. Here, it is possible to ensure the earthquake resistance of the underground tunnel by setting the wall of the underground tunnel room 101 to an appropriate thickness according to the assumed earthquake motion in the area where the nuclear power plant is located, and cables and piping. By protecting the tunnel with a tunnel, it is possible to prevent deterioration of cables and pipes due to various underground components.

  In addition, since these facilities are not normally used, it is possible to periodically check for abnormalities in cables and piping, and abnormalities in the tunnel room itself by providing a movable camera moving rail 102 etc. for monitoring the equipment state. Is possible. Furthermore, in order to confirm the soundness more surely, it is appropriate to periodically perform an operation check test. For this purpose, the detector 106 capable of measuring parameters such as voltage and current on the cable at equal intervals A detector cable 108 is also provided that converts the detection result into an electrical signal and leads it to an indicator 107 installed in the power plant so that it can be confirmed remotely. Moreover, the detector 109 was provided so that the same response | compatibility was possible also about the underground freshwater water supply piping 104. FIG.

  Considering the fact that it is a backup function in the event that a large-scale disaster such as a major earthquake or tsunami cannot use an external power supply on land, the underground power cable laying method has also been devised.

  FIG. 5 shows the connection between the two facilities at the shortest distance with respect to the underground power supply cable 103 that connects the offshore external power supply and freshwater receiving facilities 8 and 9 to the underground power receiving / freshwater receiving facility 12 of the nuclear power plant. The cable reservoir 110 is installed at a certain interval, and a cable for securing the cable length is stored therein in advance. As a result, a large earthquake occurs and the ground from the external power supply and freshwater receiving facilities 8 and 9 to the underground power receiving and freshwater receiving facilities 12 is displaced by a fault, etc., and the cable length is longer than the cable length originally laid. Even in such a case, it is possible to supply power from the external power source and the fresh water receiving facilities 8 and 9 to the nuclear power plant without being cut by the spare cable length in the cable reservoir 110.

  FIG. 6 shows a bellows pipe 112 obtained by processing a relatively soft pipe such as vinyl chloride. In the case where fresh water is sent to the nuclear power plant from the external power source and the fresh water receiving facility 8, 9 to the underground power receiving / fresh water receiving facility 12 through the underground fresh water supply piping, a part of the underground fresh water supply piping is shown in FIG. The bellows piping 112 which processed piping with comparatively high softness, such as the shown vinyl chloride, was applied. As a result, fresh water can be supplied from the external power supply and fresh water receiving facilities 8 and 9 to the nuclear power plant without the pipes being cut off due to the ground displacement as in the case of the power cable. Such measures are also effective as a seismic measure when the wall thickness of the tunnel chamber 101 in FIG. 4 is not sufficient or when it is not desired to install the tunnel chamber 101 itself.

  As one example of installation, tidal power generation and wave power generation facilities were connected to an external power source and fresh water receiving facility 9. An external power source and fresh water receiving facility were installed next to the tidal power generation facility and wave power generation facility so that the power source and the fresh water supply ship could berth. The tidal power generation and wave power generation facilities usually transmit the generated electricity to the nuclear power plant to supplement the power source in the power plant, and if it is not damaged by a disaster, the power can be generated even if the power source and fresh water supply ship do not arrive. Can be supplied to nuclear power plants.

  FIG. 7 shows a power supply and fresh water supply ship 301. The power supply and freshwater supply ship generated electricity by connecting to the offshore structure of the external power supply and freshwater receiving equipment and connecting the power cable or water supply pipe, or by connecting the power cable or water supply pipe to the underwater structure. A ship that supplies electricity or stored fresh water to a nuclear power plant. The power supply and fresh water supply ship has a power generation facility 310, a replenishment facility 311 that can supply fuel necessary for power generation from other ships, and a fresh water storage tank 312 and a water pump 313 that can receive water from other ships. Have. Thus, electricity and fresh water can be continuously supplied to the nuclear power plant while being connected to the external power supply and fresh water receiving equipment while continuously supplying fuel and fresh water from other supply ships.

  FIG. 8 shows an external power receiving terminal and a receiving port 204 of the fresh water supply port 202 in the facility. Assuming that the worker cannot land and work due to the influence of radiation or the like, the external power receiving terminal and the receiving port 204 of the fresh water supply port 202 in the facility shown in FIG. The target position of the receiving port 204 from the power supply and fresh water supply ship can be increased.

  FIG. 9 shows connection work of the supply pipe from the power source and the fresh water supply ship to the external power source and the fresh water receiving facility. The water supply pipe 308 and the power cable terminal (not shown) are moved to the receiving port 204 by the moving means 304 of the power supply and fresh water supply ship 301 shown in FIG. The moving means 304 for piping and power cable terminals from the power supply and fresh water supply ship of the ship 301 can be realized by a crane. Further, in order to reduce the load applied to the piping due to the vibration of the ship due to the difference in wave and fullness, the piping 308 is configured using a water supply hose 309 that bends flexibly, for example, a mesh-like hose that has been waterproofed. Thus, vibration can be absorbed and the load applied to the piping can be reduced. Of course, the same effect can be obtained even if the water supply hose 309 that flexes directly and flexibly is connected to the external power receiving terminal and the fresh water supply port 202. Although the water hose has been described, the same applies to the power cable.

  Further, since the vibration of the ship can be suppressed by fixing the power source and the fresh water supply ship to the upper fixed part 201 provided in the upper part of the facility shown in FIG. 10 or the side fixed part 203 provided in the side surface, the power supply and the fresh water supply ship It can be easily connected by moving means such as piping and power cable terminals.

  FIG. 11 shows another embodiment of an external power source and a fresh water receiving facility (submarine building) 8 which is usually in the sea and can be connected to a terminal of an external power source or a fresh water supply port. A floating structure 401 capable of obtaining buoyancy by gas filling to float or forced drainage from a tank is placed on the upper part of the seabed structure 8, and the floating structure 401 is provided with a power receiving and fresh water supply connection facility 8, and the floating structure By floating the object 401 on the sea, the connection work with the power source and the fresh water supply ship can be facilitated. Moreover, the seabed building foundation 20 is fixed to the seabed. The foundation floating structure 401 may be pulled up to the sea by a ship. Since the floating structure 401 and the submarine structure 8 are provided with a global positioning system, and the floating structure 401 is provided with illumination 405 by a battery, the position can be easily confirmed. The undersea building foundation 20 and the floating structure 401 are underwater connection paths 404 including power cables and fresh water supply pipes that are longer than the water depth and protected by a material such as fiber reinforced resin having strength and flexibility. It is connected. Usually, the undersea connection path 404 is stored in the submarine building 8 in a compact manner by taking advantage of its flexibility.

  Furthermore, the floating structure 401 can be fixed with a bolt or the like in addition to the power receiving and fresh water supply connecting portion provided with a terminal of an external power source or a connection portion of the fresh water supply port. A fixed connection 402 is provided. The power receiving and fresh water supply connection facility 8 has a structure that floats on the sea surface separated from the foundation of the seabed structure. Therefore, by fixing the floating structure 401 and the power and fresh water supply ship 301, the floating structure and the supply ship are It moves as a unit, and it can be avoided that the wiring and piping are subjected to a load due to vibrations caused by wave and fullness. Further, by providing a shock absorbing structure 403 such as rubber around the floating structure 401, it is possible to reduce the impact at the time of contact with the power source and the fresh water supply ship, and to proceed more safely.

  In a nuclear power plant, when power from an external power source and an emergency generator is lost (when all AC power is lost), DC power from a battery is supplied. The supply time is approximately 8 hours depending on the capacity of the battery installed in the nuclear power plant. If the external power supply is restored within the supply time, the cooling function of the nuclear reactor and spent fuel storage tank can be maintained. Even if the total power supply is lost, it is possible to prevent the occurrence of an accident associated with the loss of the total power supply and the expansion of the damage due to the accident by restoring the external power supply within the shortest possible time. Accordingly, the power supply and freshwater supply ship will be maintained in a port where the power supply and freshwater supply ship can reach the nuclear power plant within 12 hours, preferably within 8 hours. For example, in the case of a power source and a fresh water supply ship capable of navigating the open ocean at 20 knots (39 km / h), it will be installed in a port within 450 km, preferably within 300 km from the nuclear power plant.

  Furthermore, in the case of a large-scale disaster, there is a possibility that the port where the power source and the fresh water supply ship are maintained will be damaged, and the power source and the fresh water supply ship in the port may not be used. Therefore, a power supply and freshwater supply ship will be installed at the port remote from the target nuclear power plant at the same time, and the power supply and freshwater supply system dispatched when the power supply and freshwater supply ship prepared in the nearby port cannot be used. It was constructed. In addition, a port that is remote from the target nuclear power plant and has a power source and a fresh water supply ship installed is located within 450 km, preferably within 300 km from the nearby nuclear power plant.

  In Japan, Tomari (Hokkaido), Todori (Aomori Prefecture), Onagawa (Miyagi Prefecture), Fukushima (Fukushima Prefecture), Tokai (Ibaraki Prefecture), Kashiwazaki Kariwa (Niigata Prefecture), Hamaoka (Shizuoka Prefecture), Shiga (Ishikawa Prefecture), Tsuruga, Mihama, Takahama, Ooi (Fukui Prefecture), Shimane (Shimane Prefecture), Ikata (Ehime Prefecture), Genkai (Saga Prefecture), Kawauchi (Kagoshima Prefecture) within 8 hours The ports where the power supply and freshwater supply ship for constructing the power supply and freshwater supply system will be established are Otaru, Tomakomai, Sendai, Niigata, Tokyo, Nagoya, Maizuru, Hiroshima and Nagasaki.

  Due to a large-scale earthquake and tsunami disaster, the target nuclear power plant lost its external power supply from the land, and the emergency generator in the power plant stopped operating. Furthermore, it was found that the land access road connected to the nuclear power plant was difficult to carry in equipment by vehicles due to cracks and depression caused by the earthquake, and it took time to recover.

  A power supply and freshwater supply ship installed in a port 250 km away from the nuclear power plant sailed immediately after the earthquake occurred, and there was no damage even if it encountered a tsunami off the port, leaving the offshore of the nuclear power plant. It is possible to arrive in 7 hours. The port of the nuclear power plant was difficult to berth due to the damage of the tsunami, but the offshore external power supply and fresh water receiving facilities, and the route connected to the nuclear power plant were spared the damage from the earthquake and tsunami. The power supply and freshwater supply ship berthed at the offshore external power supply and freshwater receiving facility, connected the power cable and the water supply pipe, and set off the supply of the generated electricity and freshwater from the freshwater storage tank to the nuclear power plant. It is possible to start after 7.5 hours. As a result, the nuclear power plant had only a DC power supply with a battery, and the remaining supply time was less than one hour, but switched to an external AC power source supplied from a power source and a freshwater supply ship, and the reactor and used Cooling of the fuel storage tank can be continued. Further, the reduced cooling water can be supplemented with fresh water supplied from the power source and the fresh water supply ship.

  It took 7 days for the external power supply and freshwater supply from the land at the nuclear power plant to recover, but during that time, the fuel and freshwater were continuously supplied from the supply ship to the power supply and freshwater supply ship. It is possible to supply electricity and fresh water from the power supply and fresh water supply ship to the nuclear power plant, continue cooling the reactor and the spent fuel storage tank, and shift the reactor to a cold shutdown state.

  As described above, the use of the external power supply and fresh water receiving facility, power supply and fresh water supply ship, power supply and fresh water supply system of the present invention avoids the loss of the entire power supply of the nuclear power plant and the loss of cooling water or enlarges the damage. Can be prevented.

  The present invention is applicable to a nuclear power plant located in a coastal area where safety is required against loss of all power sources and loss of cooling water during a disaster.

  DESCRIPTION OF SYMBOLS 1 ... Land, 2 ... Harbor, 3 ... Offshore, 4 ... Reactor building, 5 ... Turbine building, 6 ... Embankment, 7 ... External power supply and fresh water receiving equipment (port equipment), 8 ... External power supply and fresh water receiving equipment (Submarine building), 9 ... External power supply and freshwater receiving facility (Sea building), 10 ... Underground connection route (underground tunnel), 11 ... Submarine connection route, 12 ... Underground power receiving / freshwater receiving device, 13 ... Seabed, 14 ... Sea surface, 15 ... Foundation, 16 ... Pillar, 17 ... Pier and work floor, 19 ... Lighthouse, 20 ... Submarine building foundation, 21 ... Buoy, 22 ... Buoy connection rope, 101 ... Tunnel room, DESCRIPTION OF SYMBOLS 102 ... Movable camera moving rail, 103 ... Underground power supply cable, 104 ... Underground freshwater water supply piping, 105 ... Cover, 106 ... Detector for power supply cable, 107 ... Indicator, 108 ... Detector cable, 109 ... Detection for water supply piping 110, K 111, connection portion (flange, etc.), 112, bellows piping, 202, external power receiving terminal and fresh water supply port, 204 ... receiving port, 301 ... power supply and fresh water supply ship, 304 ... piping and power cable terminal Moving means, 308 ... water supply piping, 309 ... water supply hose, 310 ... power generation equipment, 311 ... replenishment equipment, 312 ... fresh water storage tank, 313 ... water supply pump, 401 ... floating structure, 402 ... fixed connection, 403 ... buffer structure Part, 404 ... Underwater connection route

Claims (12)

  A power source and fresh water installed at a nuclear power plant port or offshore that is not easily damaged by a tsunami, having a power receiving terminal and a fresh water supply port connected to the nuclear power plant, a power generation facility and a fresh water storage tank An external power supply and fresh water receiving facility characterized in that electricity and fresh water are supplied from a supply ship to the nuclear power plant. In the external power source and fresh water receiving facility according to claim 1,
The connection to the nuclear power plant is an external power supply and fresh water receiving facility, characterized in that a power cable and a water supply pipe are buried in the seabed. In the external power source and fresh water receiving facility according to claim 1,
The connection to the nuclear power plant is an external power supply and freshwater receiving facility characterized in that the power cable and water supply pipe are protected by concrete pipes, metal pipes with anticorrosion treatment, or reinforced resin, and installed on the sea floor. In the external power source and fresh water receiving facility according to claim 1,
Two or more external power sources and fresh water receiving facilities are installed, and are connected to each other and connected to a nuclear power plant through a plurality of routes. In the external power source and fresh water receiving facility according to claim 1,
An external power supply and fresh water receiving facility characterized by being connected to a tidal power generation facility or wave power generation facility installed on the sea. In the external power source and fresh water receiving facility according to claim 1,
The external power source and the fresh water receiving facility are a marine structure based on the bottom of the sea so that the ship can berth, or a submarine structure that is usually in the sea and can be connected from the ship to a terminal of an external power source or a fresh water supply port. External power supply and fresh water receiving facility characterized by being a thing. In the external power source and fresh water receiving facility according to claim 1,
The external power supply and the fresh water receiving facility are usually installed in a seabed structure in the sea, and a floating structure having an external power supply receiving and fresh water supply facility provided with an external power supply terminal or a fresh water supply port is External power supply and fresh water characterized by buoyancy obtained by gas filling to float or supply of fresh water from a tank or forced drainage from a tank, or being lifted by a ship and rising to the sea and receiving supply of external power and fresh water from a ship Acceptable equipment. In the external power source and fresh water receiving facility according to claim 1,
The connection path to the nuclear power plant is an underground tunnel structure having a wall thickness corresponding to the assumed earthquake motion, and it is possible to remotely detect damage to equipment, power cables or water supply piping that can be monitored by moving the camera inside External power supply and fresh water receiving facility characterized by having a detector. In the external power supply and fresh water receiving facility according to any one of claims 2 and 3,
An external power supply characterized by installing a cable reservoir for storing a cable for securing a power cable length at a predetermined interval, or by bending a water supply pipe in advance at a flexible bellows pipe portion Fresh water receiving facility.   It has a power generation facility that can replenish fuel necessary for power generation not only from its own fuel tank but also from other ships, and preferably has a fresh water storage tank and a water pump that can receive water from other ships, A power source and a fresh water supply ship for supplying electricity and fresh water to the external power source and fresh water receiving facility according to claim 1. In the external power source and fresh water receiving facility according to claim 1,
The external power receiving terminal and the fresh water supply port receiving port have a conical shape, and are configured to be fixed by pressing the connection part brought from the power source and the fresh water supply ship against the receiving port. Features an external power supply and freshwater receiving equipment.   The power supply and fresh water supply ship according to claim 1 are simultaneously installed in a port that can arrive at a nuclear power plant within a time that DC power can be maintained after the loss of all AC power and a port remote from the target nuclear power plant. A power supply and a freshwater supply system.

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