JP6242690B2 - Intake equipment for nuclear power plants - Google Patents

Description

  The present invention relates to a water intake facility of a nuclear power plant for taking in cooling water used in the nuclear power plant.

  For example, a nuclear power plant having a pressurized water reactor (PWR) uses light water as a reactor coolant and a neutron moderator to produce high-temperature and high-pressure water that does not boil throughout the reactor core. Water (primary coolant) is sent to a steam generator to generate steam by heat exchange, and this steam (secondary coolant) is sent to a turbine generator to generate electricity. This steam generator transfers the heat of the high-temperature and high-pressure primary coolant from the nuclear reactor to the secondary coolant, and generates steam here.

  In such a nuclear power plant, water intake equipment is installed in the vicinity of a coast or a river, and seawater or river water is used as cooling water. For example, seawater is taken in by a circulating water pump, supplied to a condenser in a turbine building, and steam (secondary coolant) discharged from the turbine is cooled. Also, seawater is taken in by a seawater pump and supplied to a reactor auxiliary coolant cooling device in the reactor building to cool the cooling water (primary coolant) discharged from the reactor containment vessel.

  It is important to always secure a sufficient amount of cooling water for the intake facilities of nuclear power plants, and a predetermined water level in the intake channel must be maintained. However, when a tsunami occurs, there is a risk that the water level in the intake channel will drop due to the pulling wave. In other words, the tsunami wave height increases as it approaches the coast from the offshore and the seabed becomes shallower, reaching several times offshore along the coastline. Then, after the landing tsunami rushes with a large water pressure, a pulling wave that continues to drag the seawater to the offshore acts. At this time, in the intake channel, the water level of the cooling water (seawater) is lowered by the pulling wave, and various pumps cannot take in the cooling water, and air vortex may be generated and damaged.

  As what solves such a problem, there exists a thing described in the following patent document 1, for example. The water intake facility of the nuclear power plant described in this patent document 1 is provided with a weir for preventing the outflow of seawater in the shared open water for intake during a tsunami at the seawater intake in the shared open water for intake. Is set lower than the normal seawater pump suction port in the normal seawater pump installed in the pump building, and an effective water source area of seawater sucked in by the emergency seawater pump suction port in the emergency seawater pump is secured. To do.

Japanese Patent Laid-Open No. 06-324190

  When weirs are provided in the intake channel (shared open channel for intake water) as in the case of conventional nuclear power plant intake facilities, it is possible to prevent cooling water from flowing out of the intake channel when a pulling wave occurs. The flow over the weir is strong and the velocity distribution changes greatly, and there is a risk that a water column vortex may be generated at the pump suction port, or air may be drawn from the water surface.

  The present invention solves the above-described problems, and provides a water intake facility for a nuclear power plant that can supply cooling water to a predetermined cooling position by a pump by always securing an appropriate amount of cooling water in a water intake tank. The purpose is to do.

  A water intake facility of the nuclear power plant of the present invention for achieving the above object includes a water intake channel having one end communicating with a water intake source, a water intake tank that is connected to the other end of the water intake channel and opens upward. It has a water intake pump provided in the water intake tank, a siphon part provided in the water intake passage, and an air supply passage capable of supplying air to the siphon part.

  Accordingly, since water from the water intake source flows into the water intake tank through the water intake channel, the water intake pump can take water from the water intake tank and supply it to a predetermined cooling position. And at the time of the occurrence of a pulling wave, the water in the intake tank tries to flow out to the intake source side through the intake channel, but at this time, this siphon part becomes a weir by supplying air from the air supply passage to the siphon part, Outflow of water from the intake tank is prevented. As a result, it is possible to supply cooling water to a predetermined cooling position by a pump by always securing an appropriate amount of cooling water in the water intake tank.

  The water intake facility for a nuclear power plant according to the present invention is characterized in that an opening / closing valve is provided in the air supply passage.

  Therefore, normally, when the on-off valve is closed and air supply from the air supply passage to the siphon unit is stopped, the siphon unit is filled with water, so that water from the water intake source passes through the intake channel and the siphon unit to the intake tank. Inflow becomes possible. On the other hand, when a pulling wave occurs, opening the on-off valve and supplying air from the air supply passage to the siphon part will separate the intake source side and intake tank side by the siphon part. It is possible to prevent an outflow of water and to secure an appropriate amount of cooling water in the intake tank.

  In the water intake facility of the nuclear power plant of the present invention, a water level meter that measures the water level of the water intake tank, and a control device that opens the on-off valve when the water level measured by the water level gauge falls below a predetermined water level set in advance. Is provided.

  Therefore, when the pulling wave occurs, the water level drops due to the outflow of water from the water intake tank, and the control device opens the on-off valve when the water level of the water intake tank measured by the water level gauge falls below the predetermined water level. Here, air is supplied from the air supply passage to the siphon part, and the intake source side and the intake tank side are divided by the siphon part, so there is no need to manually operate the on-off valve, and the on-off valve automatically The water can be prevented from flowing out of the water intake tank and the reliability can be improved.

  The water intake facility for a nuclear power plant according to the present invention is characterized in that an exhaust device capable of discharging air from the siphon part is provided.

  Therefore, when the water from the water intake source flows into the water intake tank through the water intake channel, the internal air remains in the siphon part. Therefore, the air can be filled with water by discharging the air in the siphon part by the exhaust device. The flow of water in the section is optimized, and the intake pump can appropriately take water from the intake tank.

  In the water intake facility of the nuclear power plant according to the present invention, the air supply passage has an open air pipe whose upper end is open to the atmosphere and extends to almost the same height as the water intake tank.

  Therefore, when the water level drops due to the outflow of water from the water intake tank when the pulling wave occurs, the water level of the air release pipe also decreases and air is supplied to the siphon part. Is cut off by the siphon unit, and the outflow of water from the water intake tank can be prevented, and the apparatus can be simplified by using an air supply pipe as the air supply passage.

  In the water intake facility for a nuclear power plant according to the present invention, the siphon unit is characterized in that a horizontal length is set to be larger than a vertical length.

  Therefore, by setting the horizontal length to be larger than the vertical length at the siphon unit, the siphon unit can be kept low to suppress an increase in size of the device.

  According to the water intake facility of the nuclear power plant of the present invention, the siphon portion is provided in the intake channel, and the air supply passage is provided in the siphon portion. The siphon part is used as a weir to prevent the outflow of water from the intake tank, and by always ensuring an appropriate amount of cooling water in the intake tank, the pump can supply cooling water to a predetermined cooling position.

FIG. 1 is a schematic diagram illustrating a water intake facility of the nuclear power plant according to the first embodiment. FIG. 2 is a schematic configuration diagram illustrating a nuclear power plant. FIG. 3 is a schematic diagram showing a cooling system using cooling water in a nuclear power plant. FIG. 4 is a schematic diagram illustrating a water intake facility of the nuclear power plant according to the second embodiment. FIG. 5 is a schematic diagram illustrating a water intake facility of the nuclear power plant according to the third embodiment. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5 showing a cross section of the intake channel.

  Exemplary embodiments of a water intake facility for a nuclear power plant according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

[First Embodiment]
FIG. 2 is a schematic configuration diagram showing a nuclear power plant, and FIG. 3 is a schematic diagram showing a cooling system using cooling water in the nuclear power plant.

  The nuclear reactor according to the first embodiment uses light water as a reactor coolant and a neutron moderator, and generates high-temperature and high-pressure water that does not boil over the entire core, and generates steam by heat exchange by sending this high-temperature and high-pressure water to a steam generator. And a pressurized water reactor (PWR) that generates power by sending the steam to a turbine generator.

  In the nuclear power plant having the pressurized water reactor according to the first embodiment, as shown in FIG. 2, the reactor containment vessel 11 stores therein the pressurized water reactor 12 and the steam generator 13. The nuclear reactor 12 and the steam generator 13 are connected via pipes 14 and 15, a pressurizer 16 is provided in the pipe 14, and a primary cooling water pump 17 is provided in the pipe 15. In this case, light water is used as a moderator and primary cooling water (cooling material), and the primary cooling system maintains a high pressure state of about 150 to 160 atm by the pressurizer 16 in order to suppress boiling of the primary cooling water in the core. You are in control. Therefore, in the pressurized water reactor 12, light water is heated as primary cooling water by low-enriched uranium or MOX as fuel (nuclear fuel), and the hot primary cooling water is maintained at a predetermined high pressure by the pressurizer 16. 14 to the steam generator 13. In the steam generator 13, heat exchange is performed between the high-temperature and high-pressure primary cooling water and the secondary cooling water, and the cooled primary cooling water is returned to the pressurized water reactor 12 through the pipe 15.

  The steam generator 13 is connected to a steam turbine 19 through a pipe 18, and a main steam isolation valve 20 is provided in the pipe 18. The steam turbine 19 includes a high-pressure turbine 21 and a low-pressure turbine 22, and a generator (power generation device) 23 is connected to the steam turbine 19. Further, a moisture separator / heater 24 is provided between the high-pressure turbine 21 and the low-pressure turbine 22, and a cooling water branch pipe 25 branched from the pipe 18 is connected to the moisture separator / heater 24, The high pressure turbine 21 and the moisture separation heater 24 are connected by a low temperature reheat pipe 26, and the moisture separation heater 24 and the low pressure turbine 22 are connected by a high temperature reheat pipe 27.

  Each low-pressure turbine 22 of the steam turbine 19 has a condenser 28, and steam is discharged from each low-pressure turbine 22. The condenser 28 is connected to a turbine bypass pipe 30 having a bypass valve 29 from the pipe 18.

  The condenser 28 is connected to a pipe 31, and is connected to a condensate pump 32, a ground condenser 33, a condensate demineralizer 34, a condensate booster pump 35, and a low-pressure feed water heater 36. Further, the piping 31 is connected to a deaerator 37 and is provided with a main feed water pump 38, a high-pressure feed water heater 39, and a main feed water control valve 40.

  Accordingly, the steam generated by exchanging heat with the high-temperature and high-pressure primary cooling water in the steam generator 13 is sent to the steam turbine 19 (the high-pressure turbine 21 to the low-pressure turbine 22) through the pipe 18, and the steam is generated by the steam. The turbine 19 is driven to generate power by the generator 23. At this time, the steam from the steam generator 13 drives the high-pressure turbine 21, then the moisture contained in the steam is removed and heated by the moisture separator / heater 24, and then the low-pressure turbine 22 is driven. Then, the steam that has driven the steam turbine 19 is cooled by using the seawater in the condenser 28 to become condensate, and the ground condenser 33, the condensate demineralizer 34, the low pressure feed water heater 36, the deaerator 37, the high pressure It is returned to the steam generator 13 through a feed water heater 39 or the like. The steam generator 13 is connected to the steam turbine 19 via pipes 18 and 31, and cooling water (steam) is circulated by the condensate booster pump 35, the main feed water pump 38, and the like.

  By the way, the nuclear power plant described above is provided in the vicinity of a coast or a river. Water intake equipment is installed on the coast or a river, and seawater or river water is used as cooling water. As shown in FIG. 3, the water intake facility 50 includes a water intake channel 51 and a water intake tank 52, and seawater can be stored in the water intake tank 52 from the sea as a water intake source as cooling water. The intake tank 52 is provided with a seawater pump 53 and a circulating water pump 54 as intake pumps. The seawater pump 53 and the circulating water pump 54 can take cooling water (seawater) of the water storage tank 52.

  The seawater pump 53 is connected to a reactor auxiliary machine cooling water cooler 56 in a reactor building (not shown) via a water intake pipe 55, and the reactor auxiliary machine cooling water cooler 56 is connected via a drain pipe 57. It is connected to the discharge channel 58. The reactor auxiliary machine cooling water cooler 56 cools the cooling water of the spent fuel pool 59 installed in the reactor containment vessel 11 (see FIG. 2), for example, and cools this spent fuel pool. A cooling water circulation pipe 60 for circulating water is provided, and a pump 61 is provided in the cooling water circulation pipe 60. Therefore, the auxiliary reactor cooling water cooler 56 exchanges heat between the seawater taken by the seawater pump 53 and the cooling water (primary cooling water) of the spent fuel pool 59 circulating through the cooling water circulation pipe 60. The primary cooling water can be cooled by the cooling water. The seawater taken by the seawater pump 53 not only cools the cooling water in the spent fuel pool by the reactor auxiliary machine cooling water cooler 56 but also uses an air conditioning refrigerator, an emergency diesel generator cooler, etc. It is used as cooling water for cooling. That is, the seawater taken by the seawater pump 53 is used to cool the primary cooling water in the reactor containment vessel 11.

  The circulating water pump 54 is connected to a condenser 28 in a turbine building (not shown) via a water intake pipe 62, and the condenser 28 is connected to a water discharge path 58 via a drain pipe 63. As described above, the condenser 28 cools the steam discharged from the low-pressure turbine 22. Therefore, the condenser 28 can perform heat exchange between the cooling water taken by the circulating water pump 54 and the steam (secondary cooling water) flowing therein, thereby cooling the secondary cooling water with the cooling water. .

  By the way, when the tsunami occurs, the water intake facility 50 of the nuclear power plant may drop the water level of the water intake tank 52 due to the pulling wave, and the seawater pump 53 and the circulating water pump 54 may not be able to take an appropriate amount of cooling water. There is. Therefore, in this embodiment, by providing a siphon part to be described later in the intake channel 51, even when a pulling wave is generated, by always securing an appropriate amount of cooling water in the intake tank 52, each pump 53, 54 enables cooling water to be taken.

  Here, the water intake facility 50 of the nuclear power plant will be described in detail. FIG. 1 is a schematic diagram illustrating a water intake facility of the nuclear power plant according to the first embodiment.

  A water intake facility 50 of a nuclear power plant includes a water intake channel 51 having one end communicating with the sea as a water intake source, a water intake tank 52 that is connected to the other end of the water intake channel 51 and opens upward, and a water intake tank 52. It has a seawater pump 53 and a circulating water pump 54 provided, a siphon part 71 provided in the intake channel 51, and an air supply passage 72 capable of supplying air to the siphon part 71.

  The water intake tank 52 can store a predetermined amount of cooling water and is open at the top. The seawater pump 53 and the circulating water pump 54 can take the cooling water stored in the water intake tank 52, and the water intakes 53 a and 54 a extend to the vicinity of the bottom of the water intake tank 52. The intake channel 51 is a pipe, one end of which is in communication with the sea, and the other end is connected to the side of the intake tank 52.

  The siphon unit 71 is a pipe having the same diameter as the pipe of the intake channel 51, and is provided in an intermediate portion of the intake channel 51. The siphon unit 71 includes a first inclined portion 81, an upper horizontal portion 82, and a second inclined portion 83, and is set to have a passage area that is substantially the same as that of the intake channel 51. Here, the water intake tank 52 can store cooling water up to the normal water level L2 above the bottom surface height L1 of the upper horizontal part 82 in the siphon part 71, and the bottom surface height L1 of the upper horizontal part 82 is in the water intake tank 52. It is set to substantially the same height as the predetermined water level L3 set in advance. The predetermined water level L3 is a water level that is higher than the lowest suction water level of the seawater pump 53 and the circulating water pump 54 and lower than the normal lowest water level that becomes lower due to ebb tide or the like.

  One end portion (lower end portion) of the air supply passage 72 communicates with the upper horizontal portion 82 of the siphon portion 71 and the other end portion (upper end portion) is open to the atmosphere. The air supply passage 72 is provided with an electromagnetic on-off valve 73. Further, the water intake tank 52 is provided with a water level meter 74 for measuring the water level of the cooling water. The control device 75 is connected to an electromagnetic on-off valve 73 and a water level meter 74, and can open and close the electromagnetic on-off valve 73 based on the coolant level measured by the water level meter 74. Specifically, the control device 75 opens the electromagnetic on-off valve 73 when the coolant level measured by the water level gauge 74 falls below a predetermined water level L3.

  The air supply passage 72 is provided with an exhaust passage 76 between the upper horizontal portion 82 of the siphon portion 71 and the electromagnetic on-off valve 73, and a vacuum pump 77 is provided in the exhaust passage 76. The control device 75 can drive and control the vacuum pump 77. Here, the exhaust device of the present invention capable of exhausting air from the siphon unit 71 includes an exhaust passage 76 and a vacuum pump 77. Although the exhaust passage 76 is connected to the air supply passage 72, it may be directly connected to the upper horizontal portion 82 of the siphon portion 71.

  Accordingly, seawater from the sea flows into the water intake tank 52 through the intake path 51 as indicated by the solid line in FIG. 1, but air remains in the upper horizontal part 82 because of the siphon part 71. Therefore, the control device 75 drives the vacuum pump 77 to discharge the air remaining in the upper horizontal portion 82 through the air supply passage 72 and the exhaust passage 76 and fill the upper horizontal portion 82 of the siphon portion 71 with seawater. . Therefore, when the seawater pump 53 and the circulating water pump 54 are operated, the cooling water (seawater) can be sucked from the intake ports 53a and 54a and supplied to a predetermined cooling position.

  On the other hand, when a pulling wave is generated by the tsunami, the cooling water in the intake tank 52 flows out to the sea through the intake channel 51 as indicated by the dotted line in FIG. When the cooling water in the water intake tank 52 flows out, the water level of the cooling water stored in the water intake tank 52 decreases. The control device 75 monitors the coolant level measured by the water level meter 74, and opens the electromagnetic on-off valve 73 when the coolant level measured by the level meter 74 falls below a predetermined water level L3. Then, external air is supplied to the upper horizontal part 82 of the siphon part 71 through the air supply passage 72, and the siphon part 71 functions as a weir.

  That is, since the bottom surface height L1 of the upper horizontal portion 82 of the siphon unit 71 is set to be substantially the same as the predetermined water level L3 in the water intake tank 52, the pulling wave is taken from the second inclined portion 83 of the siphon unit 71. It does not act on the cooling water up to the water tank 52, and this cooling water is prevented from flowing out to the outside. As a result, a predetermined amount of cooling water is secured in the water intake tank 52, and at least the seawater pump 53 can supply the cooling water to a predetermined cooling position. At this time, generally, only the seawater pump 53 is operated and the circulating water pump 54 is stopped, so that the pressurized water reactor 12 is stopped.

  When the influence of the tsunami and the pulling wave disappears, the control device 75 closes the electromagnetic on-off valve 73 and drives the vacuum pump 77 to discharge the air remaining in the upper horizontal portion 82, whereby the siphon unit 71. The upper horizontal portion 82 is filled with seawater. Then, the seawater pump 53 and the circulating water pump 54 can be operated again.

  Thus, in the water intake facility of the nuclear power plant according to the first embodiment, a water intake channel 51 having one end communicating with the sea, and a water intake tank 52 that is connected to the other end of the water intake channel 51 and opens upward. , A seawater pump 53 and a circulating water pump 54 provided in the intake tank 52, a siphon part 71 provided in the intake path 51, and an air supply passage 72 capable of supplying air to the siphon part 71 are provided.

  Accordingly, since seawater from the sea flows into the intake tank 52 through the intake channel 51, the seawater pump 53 and the circulating water pump 54 can take the cooling water of the intake tank 52 and supply it to a predetermined cooling position. . When a pulling wave occurs, the cooling water in the intake tank 52 tends to flow out to the sea side through the intake path 51. At this time, air is supplied from the air supply passage 72 to the siphon part 71. 71 becomes a weir, and the outflow of the cooling water from the water intake tank 52 is prevented. As a result, by always securing an appropriate amount of cooling water in the water intake tank 52, the seawater pump 53 and the circulating water pump 54 can supply the cooling water to a predetermined cooling position.

  In the water intake facility of the nuclear power plant of the first embodiment, an electromagnetic on-off valve 73 is provided in the air supply passage 72. Therefore, normally, when the electromagnetic on-off valve 73 is closed and the supply of air from the supply passage 72 to the siphon unit 71 is stopped, the siphon unit 71 is filled with water, so that the cooling water from the sea is taken in by the intake channel 51. And it becomes possible to flow into the intake tank 52 through the siphon part 71. On the other hand, when a pulling wave is generated, if the electromagnetic on-off valve 73 is opened and air is supplied from the air supply passage 72 to the siphon part 71, the sea side and the water intake tank 52 side are separated by the siphon part 71. Therefore, it is possible to prevent the cooling water from flowing out of the water intake tank 52 and to secure an appropriate amount of cooling water in the water intake tank.

  In the water intake facility of the nuclear power plant according to the first embodiment, a water level meter 74 that measures the water level in the water intake tank 52, and an electromagnetic on-off valve 73 when the water level measured by the water level meter 74 falls below a preset predetermined water level. Is provided with a control device 75 for opening. Therefore, when a pulling wave occurs, the coolant level from the intake tank 52 flows out to lower the water level, and the control device 75 performs electromagnetic operation when the water level in the intake tank 52 measured by the water level gauge 74 falls below a predetermined water level. In order to open the open / close valve 73, air is supplied from the supply passage 72 to the siphon unit 71, and the sea side and the water intake tank 52 side are separated by the siphon unit 71. There is no need to manually operate 73, the electromagnetic on-off valve 73 can be automatically opened to prevent the cooling water from flowing out of the water intake tank 52, and the reliability can be improved.

  In the water intake facility of the nuclear power plant of the first embodiment, an exhaust passage 76 and a vacuum pump 77 are provided as exhaust devices that can exhaust air from the siphon unit 71. Therefore, when the cooling water from the sea flows into the intake tank 52 through the intake channel 51, the internal air remains in the siphon unit 71. Therefore, the vacuum pump 77 is driven so that the air remaining in the siphon unit 71 is discharged into the exhaust passage. The siphon part 71 can be filled with cooling water, the flow of the cooling water in the siphon part 71 can be optimized, and the seawater pump 53 and the circulating water pump 54 can properly take water from the intake tank 52. it can.

[Second Embodiment]
FIG. 4 is a schematic diagram illustrating a water intake facility of the nuclear power plant according to the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the second embodiment, as shown in FIG. 4, a water intake facility 90 of a nuclear power plant is connected to a water intake passage 91 having one end communicating with the sea as a water intake source and the other end of the water intake passage 91. An intake tank 92 that opens upward, a seawater pump 93 and a circulating water pump 94 provided in the intake tank 92, a siphon part 95 provided in the intake path 91, and an air supply passage capable of supplying air to the siphon part 95 The air release pipe 96 is provided.

  The intake tank 92 can store a predetermined amount of cooling water and is open at the top. The seawater pump 93 and the circulating water pump 94 can take the cooling water stored in the water intake tank 92, and the water intakes 93 a and 94 a extend to the vicinity of the bottom of the water intake tank 92. The intake passage 91 is a pipe, and one end portion thereof communicates with the sea, and the other end portion is connected to a side portion of the intake tank 92.

  The siphon unit 95 is a pipe having the same diameter as the pipe of the intake passage 91, and is provided at an intermediate portion of the intake passage 91. The siphon unit 95 includes a first inclined portion 101, an upper horizontal portion 102, and a second inclined portion 103, and is set to have a passage area that is substantially the same as the intake channel 91. The air release pipe 96 has one end (lower end) communicating with the upper horizontal part 102 of the siphon part 95 and the other end (upper end) being open to the atmosphere. The air release pipe 96 extends upward from the upper horizontal part 102 in the siphon part 95 to almost the same height as the water intake tank 92. Here, the water intake tank 92 can store the cooling water up to the normal water level L12 above the ceiling surface height L11 of the upper horizontal portion 102 in the siphon unit 95, and the liquid surface height L13 of the cooling water in the atmosphere opening pipe 96. And the normal water level L12 of the cooling water in the intake tank 92 becomes equivalent. In addition, the bottom surface height L15 of the upper horizontal portion 102 in the siphon unit 95 is set to be substantially the same as the preset predetermined water level L14 in the water intake tank 92. The predetermined water level L14 is a water level that is higher than the lowest suction water level of the seawater pump 93 and the circulating water pump 94 and lower than the normal lowest water level that becomes lower due to ebb tide or the like.

  Accordingly, the seawater from the sea flows into the intake tank 92 through the intake path 91 at this time as indicated by the solid line in FIG. At this time, the normal water level L12 of the water intake tank 92 is higher than the ceiling surface height L11 of the upper horizontal portion 102 in the siphon portion 95, and the upper horizontal portion 102 is provided with an air release pipe 96. The air is discharged through the atmosphere open pipe 96, and the upper horizontal portion 102 of the siphon portion 95 is filled with seawater. Therefore, when the seawater pump 93 and the circulating water pump 94 are operated, the cooling water (seawater) can be sucked from the water intakes 93a and 94a and supplied to a predetermined cooling position.

  On the other hand, when a pulling wave is generated by the tsunami, the cooling water in the intake tank 92 flows out to the sea through the intake path 91 as indicated by the dotted line in FIG. When the cooling water in the water intake tank 92 flows out, the water level of the cooling water stored in the water intake tank 92 decreases. At this time, when the water level of the cooling water in the intake tank 92 is lowered, the coolant level L13 in the atmosphere opening pipe 96 is also lowered and supplied to the upper horizontal portion 102 of the siphon part 95 through the atmosphere opening pipe 96. . Since the bottom surface height L15 of the upper horizontal portion 102 of the siphon unit 95 is set to be substantially the same as the predetermined water level L14 in the water intake tank 92, the pulling wave is taken from the second inclined portion 103 of the siphon unit 95. It does not act on the cooling water up to the water tank 92, and this cooling water is prevented from flowing out to the outside. As a result, a predetermined amount of cooling water is secured in the water intake tank 92, and at least the seawater pump 93 can supply the cooling water to a predetermined cooling position.

  Thus, in the water intake facility of the nuclear power plant according to the second embodiment, a water intake passage 91 having one end communicating with the sea, and a water intake tank 92 connected to the other end of the water intake passage 91 and opened upward. A seawater pump 93 and a circulating water pump 94 provided in the intake tank 92, a siphon part 95 provided in the intake path 91, and an air release pipe 96 as an air supply passage capable of supplying air to the siphon part 95. Yes.

  Accordingly, since seawater from the sea flows into the intake tank 92 through the intake passage 91, the seawater pump 93 and the circulating water pump 94 can take the cooling water of the intake tank 92 and supply it to a predetermined cooling position. . When a pulling wave is generated, the cooling water in the intake tank 92 tends to flow out to the sea side through the intake path 91. At this time, air is supplied from the air release pipe 96 to the siphon part 95, so that the siphon part 95 becomes a weir, and the outflow of cooling water from the water intake tank 92 is prevented. As a result, by always securing an appropriate amount of cooling water in the water intake tank 92, the seawater pump 93 and the circulating water pump 94 can supply the cooling water to a predetermined cooling position. Moreover, the apparatus can be simplified by making the air supply passage into the atmosphere open pipe 96.

[Third Embodiment]
FIG. 5 is a schematic diagram showing water intake equipment of the nuclear power plant according to the third embodiment, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5 showing a cross section of the water intake channel. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the third embodiment, as shown in FIG. 5, a water intake facility 110 of a nuclear power plant is connected to a water intake channel 51 having one end communicating with the sea as a water intake source and the other end of the water intake channel 51. A water intake tank 52 that opens upward, a seawater pump 53 and a circulating water pump 54 provided in the water intake tank 52, a siphon part 111 provided in the water intake path 51, and an air supply passage 72 that can supply air to the siphon part 111. And have.

  Here, since the intake channel 51, the intake tank 52, the seawater pump 53, the circulating water pump 54, and the air supply passage 72 are the same as those in the first embodiment described above, description thereof is omitted.

  The siphon unit 111 is provided at an intermediate portion of the intake channel 51 and includes a first inclined portion 112, an upper horizontal portion 113, and a second inclined portion 114. As shown in FIGS. 5 and 6, the siphon unit 111 is set such that the horizontal length (width) W of the upper horizontal unit 113 is larger than the vertical length (height) H. However, the first inclined portion 112, the upper horizontal portion 113, and the second inclined portion 114 in the siphon portion 111 are set to have substantially the same passage area, and the intake passage 51 is also set to have the substantially same passage area.

  In addition, since the effect | action of the water intake equipment 110 of the nuclear power plant in this embodiment is the same as that of 1st Embodiment mentioned above, description is abbreviate | omitted.

  Thus, in the water intake facility of the nuclear power plant of the third embodiment, a water intake channel 51 having one end communicating with the sea, and a water intake tank 52 connected to the other end of the water intake channel 51 and opened upward. A seawater pump 53 and a circulating water pump 54 provided in the intake tank 52, a siphon part 111 provided in the intake path 51, and an air supply passage 72 capable of supplying air to the siphon part 111 are provided.

  Accordingly, since seawater from the sea flows into the intake tank 52 through the intake channel 51, the seawater pump 53 and the circulating water pump 54 can take the cooling water of the intake tank 52 and supply it to a predetermined cooling position. . When a pulling wave occurs, the cooling water in the intake tank 52 tends to flow out to the sea side through the intake path 51. At this time, air is supplied from the air supply passage 72 to the siphon section 111, so that the siphon section 111 becomes a weir and the outflow of the cooling water from the water intake tank 52 is prevented. As a result, by always securing an appropriate amount of cooling water in the water intake tank 52, the seawater pump 53 and the circulating water pump 54 can supply the cooling water to a predetermined cooling position.

  In the water intake facility of the nuclear power plant according to the third embodiment, the horizontal length W of the upper horizontal portion 113 in the siphon unit 111 is set to be larger than the vertical length H. Therefore, by suppressing the height of the siphon unit 111 to be low, it is possible to suppress an increase in size of the device.

  In the above-described embodiment, the siphon portion is configured by the first inclined portion, the upper horizontal portion, and the second inclined portion, but is not limited to this configuration. For example, the siphon part may be composed of a first vertical part, an upper horizontal part, and a second vertical part, and the upper horizontal part may be a curved part.

  Further, in the above-described embodiment, it is desirable that the siphon portion is provided on the water intake side as much as possible.

  Further, in the embodiment described above, the water intake facility of the nuclear power plant of the present invention has been described as applied to a pressurized water reactor, but it can also be applied to a boiling water reactor (BWR). It may be applied to other nuclear reactors.

DESCRIPTION OF SYMBOLS 11 Containment vessel 12 Pressurized water reactor 13 Steam generator 19 Steam turbine 23 Generator 50, 90, 110 Intake equipment 51, 91 Intake channel 52, 92 Intake tank 53, 93 Seawater pump 54, 94 Circulating water pump 71, 95, 111 Siphon part 72 Air supply passage 73 Electromagnetic on-off valve 74 Water level gauge 75 Control device 96 Air release pipe (air supply passage)

Claims (6)

An intake channel with one end communicating with an intake source;
A water intake tank that is connected to the other end of the water intake passage and that opens upward;
A water intake pump provided in the water intake tank;
A siphon provided in the intake channel;
An air supply passage capable of supplying air to the siphon unit;
I have a,
The siphon part is set to a passage area substantially the same as the intake channel, and the bottom surface height is substantially higher than a preset predetermined water level that is higher than the lowest suction water level of the intake pump and lower than the normal lowest water level of the intake tank. Set to the same height,
A water intake facility for a nuclear power plant.   The intake system for a nuclear power plant according to claim 1, wherein an opening / closing valve is provided in the air supply passage.   The water level meter that measures the water level of the water intake tank and a control device that opens the on-off valve when the water level measured by the water level meter falls below a predetermined water level set in advance are provided. Intake equipment for nuclear power plants as described in 1.   The water intake facility for a nuclear power plant according to any one of claims 1 to 3, wherein an exhaust device capable of discharging air from the siphon unit is provided.   2. The water intake facility for a nuclear power plant according to claim 1, wherein the air supply passage has an air release pipe having an upper end opened to the atmosphere and extending to substantially the same height as the water intake tank. The water intake facility for a nuclear power plant according to any one of claims 1 to 5, wherein the siphon portion is set such that a horizontal width in a passage section is set to be larger than a vertical length.

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