JP2009180530A - Nitrogen gas feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nitrogen gas feeder for simplifying a structure. <P>SOLUTION: This nitrogen gas feeder 1 includes a nitrogen gas generation device 2 and a nitrogen gas replenishment device 17 connected to a reactor container. The nitrogen gas generation device 2 includes an evaporator 3 for vaporizing liquified nitrogen supplied by a pump 5 from a trailer 43A. Nitrogen gas generated from the evaporator 3 is supplied into the reactor container through a nitrogen gas supply pipe 7. The nitrogen gas replenishment device 17 includes a liquified nitrogen storage tank 18 for storing liquified nitrogen supplied by a pump 34 from a trailer 43B. During operation of a plant, liquified nitrogen in the liquified nitrogen storage tank 18 is changed into nitrogen gas by an ordinary-temperature evaporation pipe 20 and guided into the reactor container. A thermo-electric generating element 33 installed on the ordinary-temperature evaporation pipe 20 generates the power by supply of liquified nitrogen into the ordinary-temperature evaporation pipe 20. The power is stored in a battery 35 and used for driving the pumps 5, 34. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a nitrogen gas supply device, and more particularly to a nitrogen gas supply device that supplies nitrogen gas into a reactor containment vessel in a nuclear power plant.

  In a nuclear power plant, even if hydrogen is generated in the reactor containment vessel by replacing the atmosphere in the reactor containment vessel containing the reactor with nitrogen gas, It does not occur in the reactor containment vessel. Normally, this nitrogen gas is supplied from a nitrogen gas generator installed outdoors.

  Nitrogen gas supply equipment consists of a nitrogen gas generator for replacing the inside of the reactor containment vessel, which has become an air atmosphere in the periodic inspection of the nuclear power plant, with nitrogen gas, and the inside of the reactor containment vessel during operation of the nuclear power plant. A nitrogen gas replenishing device for continuously replenishing leaking nitrogen gas is provided.

  The nitrogen gas generator includes a nitrogen gas evaporator that stores hot water heated by steam. Liquid nitrogen is supplied from the trailer to the nitrogen gas evaporator through liquefied nitrogen piping. This liquid nitrogen is gasified by heat exchange with warm water in a nitrogen gas evaporator. Nitrogen gas generated in the nitrogen gas evaporator is supplied into the reactor containment vessel.

  The nitrogen gas replenishing device is a facility for supplying nitrogen gas to a reactor containment vessel during operation of a nuclear power plant, and includes a liquefied nitrogen storage tank. The nitrogen gas replenishing device further includes a pressurized evaporation tube and a normal temperature evaporation tube. Liquid nitrogen is stored in a liquefied nitrogen storage tank. The pressurized evaporation tube maintains the inside of the liquefied nitrogen storage tank at a predetermined pressure, and the normal temperature evaporation tube gasifies the liquid nitrogen in the liquefied nitrogen storage tank. Nitrogen gas gasified in the normal temperature evaporator tube is supplied to the reactor containment vessel during the operation of the nuclear power plant.

  An example of a nitrogen gas generator is described in Japanese Patent Laid-Open No. 63-218896. This nitrogen gas generator has a liquid nitrogen storage tank and an evaporator. Hot water exists in the evaporator and is heated by steam. The liquid nitrogen in the liquid nitrogen storage tank is heated and vaporized by warm water in the evaporator to become nitrogen gas. This nitrogen gas is supplied into the reactor containment vessel. Japanese Patent Laid-Open No. 2003-90896 discloses a hollow fiber membrane separation type nitrogen gas generator for supplying nitrogen gas into a reactor containment vessel.

JP-A-63-218896 JP 2003-90896 A

  In the case of the nitrogen gas replenishing device and the nitrogen gas generating device described above, it is necessary to install a power supply facility for driving a pump for supplying liquid nitrogen from the trailer to the nitrogen gas replenishing device and the nitrogen gas generating device in the nuclear power plant. There is. This power supply equipment is used only when liquid nitrogen is replenished from the trailer.

  The objective of this invention is providing the nitrogen gas supply apparatus which can simplify a structure.

A feature of the present invention that achieves the above-described object includes a nitrogen gas generator and a nitrogen gas replenishing device,
The nitrogen gas generator is installed in a liquid nitrogen transport vehicle, and a first evaporation device that vaporizes the liquid nitrogen supplied by a first pump that pressurizes the liquid nitrogen from the liquid nitrogen transport vehicle, and the first evaporation. A first nitrogen gas supply pipe for guiding the nitrogen gas generated in the apparatus to the reactor containment vessel,
The nitrogen gas replenishing device is installed in a liquid nitrogen transport vehicle and stores the liquid nitrogen supplied by a second pump that pressurizes liquid nitrogen from the liquid nitrogen transport vehicle, and the liquid nitrogen storage container A second evaporator for vaporizing the liquid nitrogen therein, and a second nitrogen gas supply pipe for introducing nitrogen gas generated in the second evaporator to the reactor containment vessel,
A thermoelectric generator is attached to at least one of the second evaporator and the first piping for guiding the liquid nitrogen in the liquid nitrogen storage container to the second evaporator;
It is provided with the electric power storage device which stores the electric power generated with the thermoelectric power generator, and the wiring which connects each of the electric power storage device and the 1st pump and the 2nd pump.

  Since the first pump and the second pump are driven by the electric power generated by the thermoelectric power generation device using the cold heat of liquid nitrogen to be vaporized, the structure of the nitrogen gas supply device can be simplified.

  According to the present invention, the structure of the nitrogen gas supply device can be simplified.

  Embodiments of the present invention will be described below with reference to the drawings.

  A nitrogen gas supply apparatus according to Embodiment 1 which is a preferred embodiment of the present invention applied to a boiling water nuclear power plant will be described with reference to FIG. The nitrogen gas supply device 1 of this embodiment includes a nitrogen gas generator 2 and a nitrogen gas replenishment device 17. Both the nitrogen gas generator 2 and the nitrogen gas replenishing device 17 are communicated with each other in a reactor containment vessel containing a nuclear reactor in a boiling water nuclear power plant. The reactor containment vessel is installed in the reactor building.

  The nitrogen gas generator 2 includes a liquid nitrogen supply pipe 4, an evaporator (first evaporation apparatus) 3, a nitrogen gas supply pipe 7, and a steam supply pipe (steam supply apparatus) 11. The evaporator 3 has an evaporation pipe 44 inside. The evaporation pipe 44 is connected to the liquid nitrogen supply pipe 4 to which the on-off valve 6 is attached. The liquid nitrogen supply pipe 4 is connected to the pump 5. A nitrogen gas supply pipe 7 provided with an on-off valve 8 is connected to the evaporation pipe 44 and the reactor containment vessel. A water supply pipe 9 provided with an on-off valve 10 communicates with the evaporator 3. A steam supply pipe 11 provided with a steam inlet valve (steam flow rate adjusting valve) 12 is connected to the evaporator 3. A control air pipe 13 connected to the instrumentation compressed air system is provided with an air control valve 14 and connected to the steam inlet valve 12. A thermometer 16 is installed in the evaporator 3 and connected to a controller (control device) 15. The controller 15 controls the opening degree of the air control valve 14.

  The nitrogen gas supply device 17 includes a liquid nitrogen storage tank (liquid nitrogen storage container) 18, a normal temperature evaporation tube (second evaporation device) 20, a liquid nitrogen supply tube 21, a nitrogen gas supply tube 31, and a pressurization device 46. The liquid nitrogen storage tank 18 has a double container structure in which an internal container 19 filled with liquid nitrogen is provided in an external container 48. Since the space between the inner container 19 and the outer container 48 is evacuated due to the double container structure, evaporation of liquid nitrogen stored in the inner container 19 can be remarkably suppressed. The liquid nitrogen supply pipe 21 provided with the on-off valves 22 and 47 has one end connected to the pump 34 and the other end reaching the upper space in the internal container 19. The liquid nitrogen supply pipe 21 penetrates the outer container 48 and the inner container 19 of the liquid nitrogen storage tank 18 and is joined to the corresponding container by welding at each of the penetrating portions. A pipe 23 connected to the liquid nitrogen supply pipe 21 between the on-off valve 22 and the on-off valve 47 is connected to the bottom of the internal container 19. One end of the liquid nitrogen pipe 45 passes through the outer container 48 and the inner container 19 and reaches the vicinity of the bottom in the inner container 19. The liquid nitrogen pipe 45 penetrates the inner container 19 at the top of the inner container 19. The other end of the liquid nitrogen pipe 45 is connected to the room temperature evaporation pipe 20. A nitrogen gas supply pipe 31 connected to the normal temperature evaporation pipe 20 is connected to the reactor containment vessel. An on-off valve 32 is provided in the nitrogen gas supply pipe 31. The pressurizing device 46 includes a pressurized evaporation pipe 24, pipes 25 and 27, and a pressure control valve 26. The pipe 25 connects the pipe 23 and the pressurized evaporation pipe 24. One end of the pipe 27 is connected to the pressurized evaporation pipe 24, and the other end of the pipe 27 passes through the outer container 48 and the inner container 19 and reaches the upper space in the inner container 19. A pressure control valve 26 is installed in the pipe 27. A pressure control valve 28 for pressure reduction is connected to the pipe 27 downstream of the pressure control valve 26. A liquid level gauge 29 for measuring the liquid nitrogen level in the internal container 19 is installed in the internal container 19. A pressure gauge 30 for measuring the pressure in the internal container 19 is also installed in the internal container 19.

  A thermoelectric generator (thermoelectric generator) 33 is installed in the normal temperature evaporation tube 20. The thermoelectric generator 33 is connected to a storage battery (power storage device) 35 by a cable 37. A DC / AC converter 36 is connected to the storage battery 35 by a cable 38. The DC / AC converter 36 is connected to the pump 5 by a cable 39 and is connected to the pump 34 by a cable 40.

  When the construction of the boiling water nuclear power plant is completed, or when the periodic inspection of the boiling water nuclear power plant is completed, the air atmosphere in the reactor containment vessel is replaced with nitrogen gas. This replacement with nitrogen gas is performed by supplying nitrogen gas from the nitrogen gas generator 2 into the reactor containment vessel. The operation of replacing the air atmosphere in the reactor containment vessel by the nitrogen gas generator 2 with nitrogen gas will be described in detail below.

  The liquid nitrogen discharge port of the trailer 43 </ b> A that has transported the liquid nitrogen is connected to the pump 5. The vapor inlet valve 12 is opened by the action of the controller 15 before liquid nitrogen is supplied from the trailer 43A to the evaporator 3. Thereafter, the steam is supplied through the steam supply pipe 11 into the water 41 stored in the evaporator 3. The water 41 is heated by steam and the temperature rises to become warm water. The temperature of the water 41 measured by the thermometer 16 is transmitted to the controller 15. The controller 15 closes the air control valve 14 when the input temperature measurement value reaches the set temperature. For this reason, since the pressure of the control air does not act on the steam inlet valve 12 through the control air pipe 13, the steam inlet valve 12 is closed, and the supply of steam into the water 41 by the steam supply pipe 11 is stopped. When the temperature of the water 41 falls below the set temperature, the controller 15 opens the air control valve 14, so that air pressure acts on the steam inlet valve 12 to open the steam inlet valve 12, and steam is supplied into the water 41. . In this way, the temperature of the water 41 in the evaporator 3 is maintained at the set temperature. The supply of water into the evaporator 3 is performed from the water supply pipe 9 by opening the on-off valve 10.

  The on-off valves 6 and 8 are opened. The DC power stored in the storage battery 35 is converted into AC by the DC / AC converter 36 and supplied to the pump 5 by the cable 39. The pump 5 is driven, and the liquid nitrogen in the trailer 43A is guided to the evaporation pipe 44 in the evaporator 3 through the liquid nitrogen supply pipe 4. The liquid nitrogen in the evaporation tube 44 is heated and vaporized by heat exchange with the water 41 that has reached a predetermined temperature and is in a warm water state, and becomes nitrogen gas. Nitrogen gas generated in the evaporation pipe 44 is supplied into the reactor containment vessel through the nitrogen gas supply pipe 7. By supplying this nitrogen gas, the air in the reactor containment vessel is exhausted from the exhaust line of the reactor containment vessel via the ventilation air conditioning system of the reactor building, and the inside of the reactor containment vessel is replaced with nitrogen gas.

  When the reactor containment vessel is in a nitrogen gas atmosphere and the boiling water nuclear power plant is operating, the reactor containment vessel has a slightly higher pressure (0.1 to 1.5 psi) than the secondary containment facility. Maintained.

  When the pressure in the reactor containment vessel becomes lower than the set pressure, nitrogen gas is supplied from the nitrogen gas replenishing device 17 to the reactor during operation of the boiling water nuclear power plant in order to maintain the pressure at the set pressure. Replenished in the containment vessel. The replenishment of nitrogen gas by the nitrogen gas replenishing device 17 will be described in detail.

  Before replenishing this nitrogen gas, liquid nitrogen is supplied from the trailer 43B into the internal container 19 of the liquid nitrogen storage tank 18. That is, the trailer 43B is connected to the pump 34. Open the on-off valves 22 and 47. The DC power stored in the storage battery 35 is converted into AC by the DC / AC converter 36 and supplied to the pump 34 by the cable 40. As a result, the pump 34 is driven, and the liquid nitrogen in the trailer 43B is supplied into the internal container 19 through the liquid nitrogen supply pipe 21. When the liquid level (liquid level measurement value) of the liquid nitrogen in the internal container 19 measured by the liquid level gauge 29 reaches a predetermined first liquid level setting value, the supply of power from the storage battery 35 to the pump 34 is performed. The driving of the pump 34 is stopped. The supply from the trailer 43B to the inner container 19 is stopped.

  The liquefied nitrogen in the internal container 19 is supplied to the pressurized evaporation pipe 24 via the pipes 23 and 25 and is vaporized in the pressurized evaporation pipe 24 to become nitrogen gas. The nitrogen gas is supplied to the internal space formed above the liquid level of liquid nitrogen in the internal container 19 through the pipe 27 and pressurizes the internal space 19. When the pressure in the internal space 19 measured by the pressure gauge 30 reaches the set pressure, the pressure control valve 26 is closed. If the pressure in the internal container 19 exceeds the set pressure when the pressure control valve 26 is closed, the pressure control valve 28 is opened to discharge the nitrogen gas in the internal container 19 to the outside. When the pressure in the inner container 19 reaches the set pressure due to the discharge of the nitrogen gas, the pressure control valve 28 is closed.

  By pressurizing the inside of the inner container 19 as described above, the liquid nitrogen in the inner container 19 is supplied to the room temperature evaporation pipe 20 through the liquid nitrogen pipe 45. This liquid nitrogen is vaporized in the normal temperature evaporation tube 20 and becomes nitrogen gas. Nitrogen gas is supplied into the reactor containment vessel through the nitrogen gas supply pipe 31 during operation of the boiling water nuclear power plant. When the pressure in the internal container 19 falls below the set pressure, the pressure control valve 26 is opened and the nitrogen gas generated by vaporization in the pressurized evaporation pipe 24 is supplied into the internal container 19, and the internal container 19 is set. Held in pressure.

  When the liquid nitrogen level in the inner container 19 (measured by the liquid level gauge 29) is lowered to a second liquid level set value lower than the first liquid level set value by supplying liquid nitrogen to the room temperature evaporation tube 20 Then, electric power is supplied from the storage battery 35 to the pump 34 to drive the pump 34. Liquid nitrogen in the trailer 43B is supplied into the inner container 19. When the liquid level in the inner container 19 reaches the first liquid level set value, the operation of the pump 34 is stopped. When the liquid nitrogen in the trailer 43B runs out, the on-off valves 22 and 47 are closed and the trailer 43B is removed from the pump 34. Another trailer 43B loaded with liquid nitrogen is connected to the pump.

  During operation of the boiling water nuclear power plant, liquid nitrogen is constantly supplied to the room temperature evaporation tube 20 from the inner container 19. For this reason, the inner surface of the normal temperature evaporation tube 20 has a liquid nitrogen liquefaction temperature of about −190 ° C., and the outer surface has an atmospheric temperature (−10 ° C. to 30 ° C.). Thus, about 180 ° C. to 220 ° C. is secured. However, the temperature difference is about 10 ° C. at the outlet of the normal temperature evaporation tube 20. The thermoelectric power generation element 33 attached to the outer surface of the room temperature evaporation tube 20 generates power using the temperature difference. The electric power generated by the thermoelectric generator 33 is supplied to the storage battery 35 through the cable 37 and stored in the storage battery 35. The thermoelectric power generation element 33 generates power while liquid nitrogen is supplied to the room temperature evaporation tube 20. The storage batteries 35 are provided in such a number that the electric power generated by the power generation can be stored. As described above, the electric power stored in the storage battery 35 is used for driving the pump 5 connected to the trailer 43A and driving the pump 34 connected to the trailer 43B.

  In the present embodiment, power can be generated by the thermoelectric power generation element 33 using the cold heat of liquid nitrogen that is vaporized to be supplied to the reactor containment vessel, and can be stored in the storage battery 35. Therefore, when the liquid nitrogen is supplied from the trailer 43A into the evaporator 3 and the liquid nitrogen is supplied from the trailer 43B into the liquid nitrogen storage tank 18, the electric power generated by the thermoelectric generator 33 is supplied to the pumps 5, 34. It can be used for each drive. Such a present Example does not need to install the power supply equipment which supplies electric power to the pumps 5 and 34 from a boiling water nuclear power plant, Therefore The structure of the nitrogen gas supply apparatus 1 can be simplified. That is, in the conventional example, in order to supply electric power to each pump installed in the trailers 43A and 43B, it is necessary to provide a cable from the reactor building to the nitrogen gas supply device installed outdoors. In this embodiment, such a cable facility is not necessary.

  The present embodiment can effectively utilize the cold energy of liquid nitrogen that has been conventionally discarded. In this embodiment, since the electric power generated by using the cold heat of liquid nitrogen is used for driving the pumps 5 and 34, the electric power generated in the boiling water nuclear power plant is consumed by the nitrogen gas supply device 1. Disappears. Therefore, the electric power consumed in the power plant among the electric power generated in the boiling water nuclear power plant decreases, and the amount of power transmitted from the power plant increases.

  When liquid nitrogen is supplied from the trailer 43B to the liquid nitrogen storage tank 18 when the on-site power supply of the boiling water nuclear power plant is lost, the pump is generated by the electric power generated by the thermoelectric power generation element 33 and stored in the storage battery 35. 34 can be driven. Therefore, even when the liquid nitrogen in the inner vessel 19 reaches the second liquid level set value when the on-site power supply is lost, the liquid nitrogen can be supplied to the inner vessel 19, and the nitrogen gas to the reactor containment vessel can be supplied. Replenishment can be continued.

  The thermoelectric power generation element 33 may be attached to the outer surface of the liquid nitrogen pipe 45 instead of the room temperature evaporation pipe 20. Furthermore, the thermoelectric generator 33 can be installed in both the room temperature evaporation pipe 20 and the liquid nitrogen pipe 45. The present embodiment can also be applied to a nitrogen gas supply device that supplies nitrogen gas into a reactor containment vessel of a pressurized water nuclear power plant.

  A nitrogen gas supply apparatus according to embodiment 2, which is another embodiment of the present invention, applied to a boiling water nuclear power plant will be described with reference to FIG. The nitrogen gas supply apparatus 1A of the present embodiment has a configuration in which a nitrogen gas tank (easy storage of nitrogen gas) 49 and a pressure control valve 50 are added to the nitrogen gas supply apparatus 1 of the first embodiment. The other configuration of the nitrogen gas supply device 1A is the same as that of the nitrogen gas supply device 1. In the nitrogen gas supply device 1A, only the configuration different from the nitrogen gas supply device 1 will be described.

  The nitrogen gas tank 49 is connected to a pipe 51 where a pressure regulating valve 28 for pressure reduction is installed and connected to the pipe 27. The pressure control valve 50 is connected to the nitrogen gas tank 49. In this embodiment, the control air pipe 13 is connected to the nitrogen gas tank 49 instead of the instrumented compressed air system.

  The supply of nitrogen gas from the nitrogen gas generator 2 and the nitrogen gas supply device 17 of the nitrogen gas supply device 1A to the reactor containment vessel is performed in the same manner as the nitrogen gas supply device 1 of the first embodiment. The thermoelectric generator 33 also generates power in the same manner as the nitrogen gas supply device 1. When supplying liquid nitrogen from the trailer 43 </ b> A into the evaporator 3 and supplying liquid nitrogen from the trailer 43 </ b> B into the liquid nitrogen storage tank 18, the pumps 5 and 34 are each driven by electric power generated by the thermoelectric generator 33. The

  In the present embodiment, when adjusting the pressure in the internal container 19, the nitrogen gas in the internal container 19 discharged from the pressure control valve 28 when the pressure control valve 28 is open is stored in the nitrogen gas tank 49 through the pipe 51. Is done. The pressure of the nitrogen gas stored in the nitrogen gas tank 49 acts on the air control valve 14 by the controller 15. The pressure of the nitrogen gas in the nitrogen gas tank 49 is adjusted to a pressure that can be required to operate the steam inlet valve 12 by adjusting the opening of the pressure control valve 50. The pressure of nitrogen gas in the nitrogen gas tank 49 is lower than the pressure of nitrogen gas in the internal container 19. When the air control valve 14 is open, the pressure of nitrogen gas in the nitrogen gas tank 49 does not act on the steam inlet valve 12. In this state, the steam inlet valve 12 is closed.

  In the present embodiment, the effects produced in the first embodiment can be obtained. Furthermore, in this embodiment, the nitrogen gas in the nitrogen gas tank 49 can be used for the opening / closing operation of the steam inlet valve 12, so that the control air pipe 13 is shortened and the structure of the control air system of the inlet valve 12 is simplified. can do. More specifically, in the nitrogen gas supply device 1 of the first embodiment, the control air pipe 13 is connected to the compressed air system for instrumentation of the boiling water nuclear power plant, so that the distance to be drawn becomes long and very long. Control air piping 13 is required. On the other hand, in the present embodiment, the control air pipe 13 is connected to the nitrogen gas tank 49, so that the length can be significantly shorter than the control air pipe 13 of the nitrogen gas supply device 1.

  This embodiment can also be applied to a nitrogen gas supply device that supplies nitrogen gas into a reactor containment vessel of a pressurized water nuclear power plant.

  A nitrogen gas supply apparatus according to Embodiment 3 which is another embodiment of the present invention applied to a boiling water nuclear power plant will be described with reference to FIG. The nitrogen gas supply apparatus 1C of the present embodiment is the same as the nitrogen gas supply apparatus 1 of the first embodiment except that the steam supply pipe 11, the steam inlet valve 12, the control air pipe 13 and the air control valve 14 are deleted, and instead an electric heater 52 and a switch (switching device) 53 are provided. The other configuration of the nitrogen gas supply device 1B is the same as that of the nitrogen gas supply device 1. Only the configuration different from the nitrogen gas supply device 1 in the nitrogen gas supply device 1B will be described.

  The electric heater 52 is installed in the evaporator 3 and is connected to the DC / AC converter 36 via the switch 53 by a cable 54. The controller 15 inputs the temperature of the water 41 in the evaporator 3 measured by the thermometer 16, and closes the switch 53 when this temperature measurement value is lower than the set temperature. The electric power stored in the storage battery 35 is converted into alternating current by the direct current alternating current converter 36 and supplied to the electric heater 52. The electric heater 52 generates heat and heats the water 41 in the evaporator 3. When the temperature measurement value output from the thermometer 16 reaches the set temperature, the controller 15 opens the switch 53. Thereby, heating of the water 41 by the electric heater 52 is stopped.

  The supply of nitrogen gas from the nitrogen gas generator 2 and the nitrogen gas supply device 17 of the nitrogen gas supply device 1A to the reactor containment vessel is performed in the same manner as the nitrogen gas supply device 1 of the first embodiment. The thermoelectric generator 33 also generates power in the same manner as the nitrogen gas supply device 1. When supplying liquid nitrogen from the trailer 43 </ b> A into the evaporator 3 and supplying liquid nitrogen from the trailer 43 </ b> B into the liquid nitrogen storage tank 18, the pumps 5 and 34 are each driven by electric power generated by the thermoelectric generator 33. The

  In the present embodiment, the effects produced in the first embodiment can be obtained. Further, in this embodiment, the water 41 in the evaporator 3 is heated by the electric heater 52, so that the steam supply pipe 11, the steam inlet valve 12, the control air pipe 13 and the air provided in the first embodiment are used. The control valve 14 becomes unnecessary. For this reason, the configuration of the nitrogen gas supply device 1B is further simplified.

  This embodiment can also be applied to a nitrogen gas supply device that supplies nitrogen gas into a reactor containment vessel of a pressurized water nuclear power plant.

  A nitrogen gas supply apparatus according to Embodiment 4 which is another embodiment of the present invention applied to a boiling water nuclear power plant will be described with reference to FIG. The nitrogen gas supply device 1C of the present embodiment has a configuration in which a communication pipe 55 is added to the nitrogen gas supply device 1 of the first embodiment. An on-off valve 56 is provided in the communication pipe 55. The other configuration of the nitrogen gas supply device 1C is the same as that of the nitrogen gas supply device 1. In the nitrogen gas supply device 1C, only the configuration different from the nitrogen gas supply device 1 will be described.

  The communication pipe 55 is connected to the nitrogen gas supply pipe 31 between the normal temperature evaporation pipe 12 and the open / close valve 32, and is connected to the liquid nitrogen supply pipe 4 between the open / close valve 6 and the evaporator 3. The nitrogen gas supply device 17 is not used during a period in which nitrogen gas is supplied from the nitrogen gas generator 2 into the reactor containment vessel (a period in which the nitrogen gas generator 2 is used). Also during this period, liquid nitrogen is supplied from the inner container 19 of the nitrogen gas replenishing device 17 to the room temperature evaporation tube 12. Since the on-off valve 32 is closed, the nitrogen gas generated in the normal temperature evaporation pipe 12 is led to the liquid nitrogen supply pipe 4 through the communication pipe 55 and stored in the reactor through the evaporation pipe 44 and the nitrogen gas supply pipe 7. Supplied to the container. At this time, the on-off valve 56 is open. When introducing nitrogen gas into the reactor containment vessel through the nitrogen gas supply pipe 31, the on-off valve 32 is open and the on-off valve 56 is closed.

  In this embodiment, since the communication pipe 55 is provided, even when nitrogen gas is supplied from the nitrogen gas generator 2 to the reactor containment vessel, electric power is supplied by the thermoelectric generator 33 provided in the room temperature evaporation tube 33. Can be generated. The present embodiment can also obtain the effects produced in the first embodiment.

  The communication pipe 55 may be connected not to the liquid nitrogen supply pipe 4 but to the nitrogen gas supply pipe 7 downstream of the evaporator 3. This embodiment can also be applied to a nitrogen gas supply device that supplies nitrogen gas into a reactor containment vessel of a pressurized water nuclear power plant.

  By attaching the thermoelectric generator 33 to the outer surface of the nitrogen gas supply pipe 7, even when liquid nitrogen is supplied from the trailer 43A to the evaporator 3 through the nitrogen gas supply pipe 7, electric power is generated by the thermoelectric generator 33. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the nitrogen gas supply apparatus of Example 1 which is one suitable Example of this invention. It is a block diagram of the nitrogen gas supply apparatus of Example 2 which is another Example of this invention. It is a block diagram of the nitrogen gas supply apparatus of Example 3 which is another Example of this invention. It is a block diagram of the nitrogen gas supply apparatus of Example 4 which is another Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Nitrogen gas supply apparatus, 2 ... Nitrogen gas generator, 3 ... Evaporator 4,21 ... Liquid nitrogen supply pipe, 5,34 ... Pump, 7, 31 ... Nitrogen gas supply pipe, 11 DESCRIPTION OF SYMBOLS ... Steam supply pipe, 12 ... Steam inlet valve, 13 ... Control air piping, 14 ... Air control valve, 15 ... Controller, 16 ... Thermometer, 17 ... Nitrogen gas replenishing device, 18 ... Liquid nitrogen storage tank, 19 ... Inside Container: 20 ... Normal temperature evaporation pipe, 24 ... Pressurized evaporation pipe, 26, 28, 50 ... Pressure control valve, 33 ... Thermoelectric power generation element, 35 ... Storage battery, 36 ... DC / AC converter, 44 ... Evaporation pipe, 46 ... Addition Pressure device, 48 ... external container, 49 ... nitrogen gas tank, 52 ... electric heater, 53 ... switch, 55 ... communication piping.

Claims (4)

A nitrogen gas generator and a nitrogen gas replenisher;
The nitrogen gas generator is installed in a liquid nitrogen transport vehicle, and a first evaporation device that vaporizes the liquid nitrogen supplied by a first pump that pressurizes the liquid nitrogen from the liquid nitrogen transport vehicle, and the first evaporation. A first nitrogen gas supply pipe for guiding the nitrogen gas generated in the apparatus to the reactor containment vessel,
The nitrogen gas replenishing device is installed in a liquid nitrogen transport vehicle and stores the liquid nitrogen supplied by a second pump that pressurizes liquid nitrogen from the liquid nitrogen transport vehicle, and the liquid nitrogen storage container A second evaporator for vaporizing the liquid nitrogen therein, and a second nitrogen gas supply pipe for introducing nitrogen gas generated in the second evaporator to the reactor containment vessel,
A thermoelectric generator is attached to at least one of the second evaporator and the first piping for guiding the liquid nitrogen in the liquid nitrogen storage container to the second evaporator;
A nitrogen gas supply device comprising: an electric power storage device that stores electric power generated by the thermoelectric power generation device; and a wiring that connects the electric power storage device to each of the first pump and the second pump. The nitrogen gas generator includes a steam supply device that supplies steam that heats water in the first evaporator to heat the liquid nitrogen to be vaporized, into the first evaporator, and the nitrogen gas replenisher is A pressurizing device for pressurizing liquid nitrogen in the liquid nitrogen storage container with nitrogen gas generated by vaporizing liquid nitrogen in the liquid nitrogen storage container, and the liquid when adjusting the pressure in the liquid nitrogen storage container A nitrogen gas storage container for storing nitrogen gas released from the nitrogen storage container;
The apparatus according to claim 1, further comprising a second pipe that guides the nitrogen gas, which is a control gas for controlling an opening degree of a steam flow rate control valve provided in the steam supply device, from the nitrogen gas storage container to the steam flow rate control valve. The nitrogen gas supply device described.   Another wiring for supplying water stored in the power storage device to the electric heater is provided with an electric heater for heating water in the first evaporation device that warms the liquid nitrogen to be vaporized The nitrogen gas supply device according to claim 1, comprising:   A third pipe for introducing the nitrogen gas generated in the second evaporator to one of the liquid nitrogen supply pipe for introducing liquid nitrogen to the first evaporator of the nitrogen gas generator and the first nitrogen gas supply pipe The nitrogen gas supply device according to claim 1 provided with.

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