JP3720949B2 - Cooling equipment for liquid metal cooled reactors - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling facility for a liquid metal cooled nuclear reactor installed in a reactor building.
[0002]
[Prior art]
In a liquid metal cooled fast breeder reactor plant, a liquid metal such as liquid sodium is generally used as a coolant. Hereinafter, in this specification, although a liquid metal is demonstrated by the example of sodium, it is not limited to sodium. The cooling system equipment of the fast breeder reactor as a conventional liquid metal cooled nuclear reactor will be described with reference to FIG. In the fast breeder reactor, primary sodium heated in a reactor vessel core (not shown) flows in the primary system pipe 1 and enters the intermediate heat exchanger 2 to exchange heat with secondary sodium.
[0003]
The secondary sodium that has reached a high temperature flows in the hot leg pipe 3 and flows into the steam generator 4, and performs heat exchange with water in the steam generator 4. The secondary sodium that has become low temperature enters the secondary main circulation pump 6 through the middle leg pipe 5, is pressurized there, and is sent again to the intermediate heat exchanger 2 through the cold leg pipe 7.
[0004]
  On the other hand, the water flowing in from the water supply pipe 8 connected to the steam generator 4 exchanges heat with secondary sodium in the steam generator 4 to become steam, and becomes the main steam pipe.9To the turbine equipment (not shown).
[0005]
As an auxiliary system facility different from these devices, a cold trap 11 is used to remove impurities mixed in at the initial stage of receiving secondary sodium and impurities such as hydrogen mixed through the heat transfer pipe in the steam generator 4 during plant operation. Is used. In view of this, there is provided a circulation path that branches from the middle leg pipe 5 and connects the purification pipes 10 and 10, and uses the purification pipes 10 and 10 as a cold trap 11.
[0006]
In addition, when repairing the equipment that makes up these cooling systems, when drainage of secondary sodium is required, the drain pipe 12 from each equipment and the dump tank 13 that stores secondary sodium can be drained. Is installed.
[0007]
In the steam generator 4, when water leaks from the heat transfer tube in the steam generator 4, it reacts with secondary sodium, and a rapid pressure rise occurs as heat is generated. In order to mitigate this pressure increase, a discharge system pipe 14 is installed in the steam generator 4, and this discharge system pipe 14 is connected to a dump tank 13.
[0008]
The discharge system pipe 14 is normally partitioned by the rupture disk 15, but when the water leaks, the rupture disk 15 bursts due to the increased pressure, and the pressure is released to the dump tank 13, thereby generating excessive pressure. It is preventing. The reaction product of sodium and water flows into the dump tank 13 via the discharge system pipe 14, and is then transferred to a cyclone separator (not shown). In the figure, reference numeral 16 denotes a storage container, which partially shows the storage container wall.
[0009]
[Problems to be solved by the invention]
In the conventional cooling system, the secondary main pipe (hot leg pipe 3, middle leg pipe 5, cold leg pipe 7) is an intermediate device because the steam generator 4 and the secondary main circulation pump 6 are separate independent devices. It is necessary to connect the heat exchanger 2 and these two devices, and the long main piping system absorbs the thermal expansion of the secondary main piping by bending deformation of the elbow, and the reactor for storing these The building volume was large.
[0010]
  In addition, a large space is required for the routing of piping systems connecting auxiliary equipment such as the cold trap 11, the dump tank 13, and the discharge piping 14. Since the piping system containing liquid metal (sodium) is long in this way, a wide range of equipment such as steel liners for catching leaked liquid metal as a countermeasure against liquid metal leakageSpanIt was necessary and increased the quantity.
[0011]
Further, a number of branches such as a drain pipe 12 for filling drain in the dump tank 13 and a gas vent pipe, and a water leak detection branch pipe for detecting water leak from the heat transfer pipe in the steam generator 4. There is the problem of requiring pipes and increasing the possibility of potential leakage from these structural discontinuities.
[0012]
As described above, in the fast breeder reactor cooling system according to the prior art, when independent devices are linearly joined by piping, the thermal stress generated in the piping becomes excessive and cannot be established. The structure absorbs expansion. For this reason, the piping length becomes long and the reactor building itself that accommodates it becomes large, leading to an increase in the amount of equipment and buildings.
[0013]
In addition, with the increase in the length of liquid metal piping, the number of structural discontinuities such as branch pipes attached to this increases, the potential for potential liquid metal leakage increases, and the volume of liquid metal leakage countermeasure equipment increases. There is a problem to do.
[0014]
The present invention has been made to solve the above-described problems. By integrating the cooling system equipment, the piping length is shortened and the reactor building is made compact, and structural discontinuities such as branch pipes are reduced. And liquid metal equipment are intensively arranged and enclosed in an enclosure, thereby strengthening countermeasures against liquid metal leakage, thereby reducing plant costs and improving reliability. It is to provide a cooling facility.
[0015]
[Means for Solving the Problems]
  The invention of claim 1 is a cooling facility for a liquid metal cooled nuclear reactor in which an intermediate heat exchanger disposed in a reactor building and a steam generator are connected by piping.,A main body cylinder whose upper and lower ends are closed by an upper end plate and a lower end panel and through which liquid metal flows, a heat transfer tube disposed in the main body case, and a tube bundle of the heat transfer tube provided in the main body case A water supply pipe base and a steam pipe base for fixing the water supply pipe plate and the steam pipe plate, an inner cylinder provided in a tube bundle of the heat transfer pipes, an electromagnetic pump installed in the inner cylinder, and the body trunk A liquid metal inlet nozzle provided;An enclosure that protrudes from the upper end plate and holds an inert gas inside and surrounds the discharge-side space of the electromagnetic pump;Connected to the electromagnetic pumpProvided in the enclosurePump outlet nozzle and connected to this pump outlet nozzleA connecting pipe provided in the enclosure and provided with an instrumentation well, and connected to the connecting pipe.And a liquid metal outlet nozzle.
[0026]
  Claim2According to the present invention, there is provided a cooling facility for a liquid metal cooled nuclear reactor in which an intermediate heat exchanger disposed in a reactor building and a steam generator are connected by piping. A main body cylinder closed by a lower end plate and through which liquid metal flows, a heat transfer pipe disposed in the main body cylinder, a water supply pipe plate and a steam pipe plate provided in the main body cylinder and connected to a bundle of the heat transfer tubes A water supply nozzle and a steam nozzle, and the lower end plate throughIn the body trunkInsertionEnterA raised riser,Inside the main bodyAnd a descending pipe provided concentrically with the flow path of the liquid metal outside the riser pipe, and the lower part of the riser pipe and the downfall pipe is inserted into the steam It has the dump tank arrange | positioned through the deck under the generator, It is characterized by the above-mentioned.
[0027]
  Claim3The present invention is characterized in that a cold trap is disposed in the dump tank.
  Claim4In the invention, the heat transfer tube is a concentric double heat transfer tube composed of an inner tube and an outer tube, formed in a helical coil shape, and a braided wire is filled between the inner tube and the outer tube. It is characterized by.
[0028]
  Claim5The present invention is characterized in that the downcomer pipe and the ascending pipe are separated from each other, and are respectively installed through the lower end plate.
  Claim6The present invention is characterized in that a stop valve is provided in each of the downcomer pipe and the upcomer pipe.
[0029]
  Claims of the invention1According to the above, if liquid metal leaks from the relevant part by placing branch pipes and instrumentation wells in the upper space of the electromagnetic pump built-in steam generator, an accident will occur without taking the leaked liquid metal out of the system. Can be terminated, and the accompanying liquid metal leakage countermeasure facilities can be reduced.
[0037]
  Claim2,3,5and6According to the above, the downcomer pipe provided in the lower part of the steam generator is connected to the dump tank arranged in the lower part of the steam generator, and thereby the piping and valves necessary for the filling drain can be eliminated. In addition, by installing the cold trap in the dump tank, it is possible to greatly reduce the piping and valves necessary for the purification of the secondary liquid metal.
[0038]
  Claim2and4Therefore, by adopting a double heat transfer tube, even if the inner tube or the outer tube is broken, the breakage is detected and the heat transfer tube of both the inner tube and the outer tube is prevented from being damaged. A heat tube breakage accident can be eliminated and the reliability of the plant can be improved.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a cooling facility for a liquid metal cooled nuclear reactor according to the present invention will be described with reference to FIGS.
This first embodiment corresponds to claim 1 of the present invention. The first embodiment differs from the conventional example in that the steam generator 4 shown in FIG. 12 is improved. FIG. The steam generator 17 of the form of this is a longitudinal cross-sectional view which shows a partial side view, and FIG. 11B is a top view of FIG.
[0040]
That is, the steam generator 17 in the first embodiment is wound in a main body cylinder 20 whose upper and lower ends are closed by an upper end plate 18 and a lower end panel 19 and a helical coil disposed in the main body cylinder 20. A large number of the heat transfer tubes 21, the heat transfer tube bundle 22 formed by laminating these heat transfer tubes in a helical coil shape, and the steam tube plates respectively connected to both ends of the heat transfer tube bundle 22 23 and the water supply pipe plate 24, and the steam pipe plate 23 and the water supply pipe plate 24 are fixed, provided in the heat transfer pipe bundle 22 and the steam pipe base 25 and the water supply pipe base 26 provided on the upper and lower side surfaces of the main body barrel 20. Connected to the discharge side of the electromagnetic pump 28, the center return type electromagnetic pump 28 provided at the upper part of the inner cylinder 27, the liquid metal inlet nozzle 29 connected to the upper side surface of the main body cylinder 20, and The pump outlet nozzle 30 and the liquid connected to the pump outlet nozzle 30 via the connecting pipe 31 And comprising a genus outlet nozzle 32.
[0041]
An annular weir 33 is provided in the main body cylinder 20 facing the liquid metal inlet nozzle 29, and the upper surface of the liquid sodium metal (hereinafter referred to as liquid metal) liquid metal 34 above the weir 33 is connected to the upper plenum 35. It has become. The electromagnetic pump 28 is disposed in the pump casing 36, and the outside of the pump casing 36 is hermetically surrounded by an enclosure 37 protruding upward from the upper end plate 18.
[0042]
A support flange 38 is provided at the upper end of the pump casing 36, a flat plate 39 is provided on the support flange 38, the inside of the enclosure 37 is hermetically closed, and an inert gas atmosphere is created by sealing an inert gas. The electromagnetic pump 28 is coupled to the flat plate 39 in the circumferential direction by bolts (not shown) in a suspended state.
[0043]
The main body barrel 20 is supported on a gantry (not shown) by a skirt 40 provided on the trunk portion. The inner cylinder 27 is disposed at the center position in the main body cylinder 20 along the axis. The weir 33 is for distributing the flow rate of the liquid metal 34 that has flowed into the upper plenum 35 from the liquid metal inlet nozzle 29.
[0044]
According to the present embodiment, the water supply nozzle 26 and the steam nozzle 25 are provided on the upper and lower side surfaces of the main body cylinder 20, the liquid metal inlet nozzle 29 is provided on the upper side surface of the main body cylinder 20, and the liquid metal outlet nozzle 32 is provided on the main body. The total height of the steam generator 17 can be reduced by disposing it above the upper end plate 18 of the barrel 20.
[0045]
In addition, the electromagnetic pump 28 is connected to the support flange 38 via the inner cylinder 27 and the flat plate 39 with bolts, and the pump outlet nozzle 30 and the connecting pipe 31 are connected with a fitting structure, so that maintenance and inspection of the electromagnetic pump 28 are performed. Since the main body barrel 20 can be easily pulled out during repair, maintenance work is facilitated.
[0046]
  Next, it showed in FIG. 1 by FIG.Above generator 17 Details ofWill be explained. FIG. 2 is a perspective view showing the inside of the enclosure 37 in FIG.
[0047]
That is, a pump outlet nozzle 30 and a connecting pipe 31 connected to the pump nozzle 30 are arranged in the enclosure 37. The enclosure 37 is filled with an inert gas such as nitrogen gas, for example, and is filled with an inert gas atmosphere 41. It has become. A gas vent pipe 43 having a stop valve 42 is connected to the communication pipe 31, and one end of a branch pipe 44 is connected to the gas vent pipe 43. The other end of the branch pipe 44 is connected to a heat transfer pipe water leak detection system 45. Connected.
[0048]
  A return pipe 46 is connected between the heat transfer pipe water leak detection system 45 and the communication pipe 31, and an instrumentation well 47 is provided in the communication pipe 31. Branch pipe 44 is a water leak detection system45The return pipe 46 is for returning the liquid metal from the water leak detection system 45 to the connecting pipe 31.
[0049]
According to the present embodiment, the enclosure 37 is used to surround the structurally unconnected portions having a high possibility of leakage, such as the gas vent pipe 43, the branch pipe 44, and the instrumentation well 47, thereby preventing liquid metal leakage. However, the leakage event can be terminated without leaking the leaked liquid metal outside the system.
[0050]
  Next, according to FIG.Connecting the steam generator to other equipmentexplain. Figure3 shows the positional relationship between the short cold leg pipe 48 and the short hot leg pipe 49 that connect the intermediate heat exchanger 2 in FIG. 12 and the steam generator 17 in the present embodiment.
[0051]
The steam generator 17 is installed on the ring girder 50 via a support skirt 40. The high temperature primary liquid metal is heat-exchanged with the secondary liquid metal by the intermediate heat exchanger 2, and the high temperature secondary liquid metal flows through the short hot leg pipe 49 and flows into the steam generator 17, The generator 17 exchanges heat with water. The steam generator 17 includes an electromagnetic pump 28 as shown in FIG.
[0052]
The secondary liquid metal having a low temperature due to heat exchange with water is increased in pressure by an electromagnetic pump 28 built in the steam generator 17 and sent again to the intermediate heat exchanger 2 via the short cold leg pipe 48. The water side flows in from the water supply nozzle 26 connected to the lower foot of the steam generator 17 and flows through a heat transfer pipe (not shown) to exchange heat with the secondary liquid metal, thereby becoming steam. It is sent to a turbine facility (not shown) through a nozzle 25.
[0053]
Since the electromagnetic pump is built in the steam generator 17, the middle leg pipe 5 shown in FIG. 12 is omitted. Further, the short hot leg pipe 49 and the short cold leg pipe 48 connect the intermediate heat exchanger 2 and the steam generator 17 in a straight line so that the steam generator 17 side has an upward slope when viewed from the intermediate heat exchanger 2 side. Yes. Further, the short hot leg pipe 49 and the short cold leg pipe 48 are not provided with a heater for preheating.
[0054]
According to the present embodiment, since the outlet portion of the steam generator 17 of the short cold leg pipe 48 is the topmost portion, it is sufficient to install only one degassing pipe in the portion at the time of filling drain. Gas vent pipes can be reduced. Further, since the piping system is simple and the piping length is short, the piping section can be preheated with the heater installed in the intermediate heat exchanger 2 and the steam generator 17 without installing a heater.
[0055]
  Next, a second embodiment of the cooling facility for the liquid metal cooled nuclear reactor according to the present invention will be described with reference to FIG.. Figure4, the same parts as those in FIGS. 3 and 12 are denoted by the same reference numerals, and the description of the overlapping parts is omitted.
[0056]
This embodiment is different from the first embodiment and the conventional example in that a dump tank 13 and a cold trap 11 are arranged close to each other immediately below the steam generator 17.
That is, the upper end of the straight pipe-type short discharge pipe 51 is connected through the center of the lower end plate 19 of the steam generator 17, and the lower end of the discharge pipe 51 is inserted into the dump tank 13. Thus, a bellows 52 is attached between the lower outer surface of the discharge system pipe 51 and the dump tank 13 for airtight sealing. A rupture disk 15 is provided in the discharge system pipe 51.
[0057]
A short drain pipe 53 branched from the upper side surface of the discharge system pipe 51 above the rupture disk 15 and connected to the dump tank 13 is provided. The short drain pipe 53 is provided with a stop valve 54 and a bellows 55, and the bellows 55 connects between the short drain pipe 53 and the dump tank 13.
[0058]
Two short purification pipes 56 are provided between the lower end panel 19 and the cold trap 11, and on-off valves 57 and 58 are connected to the short purification pipe 56, and the short purification pipe 56 and cold are connected. A bellows 59 is interposed between the trap 11.
[0059]
  According to the present embodiment, a dump tank 13 and a cold trap 11 that contain secondary liquid metal, which is auxiliary equipment for the cooling system, are arranged close to the lower part of the steam generator 17 in the lower part of the steam generator 17. Has been. Steam generator17When a water leak occurs from the lower end plate 19 when a heat transfer tube (not shown) in the steam generator 17 is damaged.forThe discharge pipe 51 is routed to the dump tank 13, and the steam generator 17 and the dump tank 13 are isolated from each other by the rupture disk 15 in normal times. The discharge system pipe 51 and the dump tank 13 are connected with each other by a bellows 52, and have a structure capable of absorbing relative displacement when the steam generator 17 moves horizontally.
[0060]
Further, in addition to the discharge system pipe 51, a short drain pipe 53 is branched from the discharge system pipe 51, and a short purification system pipe 56 is routed directly from the lower part of the steam generator 17. The cold trap 11 is in contact with the bellows 55 and 59, and has a structure capable of absorbing relative displacement when the steam generator 17 moves horizontally.
[0061]
Since the auxiliary system equipment can be placed close to the steam generator 17, the length of the liquid metal pipe in the auxiliary system can be reduced. This reduces the cost of the plant and reduces the possibility of liquid metal leakage. This has the effect of improving the reliability of the plant.
[0062]
  Next, according to FIGS. 5 (a) and 5 (b)The secondThe structure of the heat transfer tube 21 in the steam generator 17 in the first and second embodiments will be described.
[0063]
  FIG. 5A shows a heat transfer tube 21a of the first example, and FIG. 5B shows a heat transfer tube 21b of the second example. The heat transfer tube 21a of the first example has a double pressure boundary by the inner tube 60 and the outer tube 61, and a braided wire made of the same material as the heat transfer tube 21a is provided in the gap between the two tubes 60 and 61. The used porous metal layer 62 is filled. Also, the gap is inactiveSexHelium gas with high thermal conductivity is enclosed as a gas.
[0064]
  The heat transfer tube 21b of the second example shown in FIG. 5B has a double pressure-resistant boundary due to the inner tube 60 and the outer tube 61, and inside the outer tube 61 is a semicircular shape for leak detection. Four grooves 63 are provided in the circumferential direction. The interface 64 of both tubes 60 and 61 is in close contact with the prestress and is inactive in the gap.SexHelium gas with high thermal conductivity is enclosed as a gas.
[0065]
Thus, according to the heat transfer tubes 21a and 21b, even if the inner tube 60 or the outer tube 61 is broken, the breakage is detected at an early stage, and both the inner tube 60 and the outer tube 61 are broken. Can be prevented, liquid metal-water reaction accidents due to breakage of both heat transfer tubes can be eliminated, and plant reliability can be improved.
[0066]
  Next, referring to FIG.LiquidA third embodiment of cooling equipment for a body metal cooled nuclear reactor will be described.. Figure6 corresponds to FIG. 4, the same parts in FIG. 6 as those in FIG.
[0067]
  6 differs from FIG. 4 in thatsideA vertical dump tank 64 is provided in place of the dump tank 13, and the dump tank 64 is surrounded by a dump tank protective container 65 and the cold trap 11 is surrounded by a cold trap protective container 66. The cold trap protection container 66 is stored in the large storage structure 67. Further, the upper deck 68 is provided at the upper end opening of the large-sized storage structure 67, and the seal structure 69 is provided between the upper deck 68 and the ring girder 50. In addition, one of the short length purification pipes 56 is connected to the straight pipe type short discharge pipe 51.
[0068]
In the present embodiment, a vertical dump tank 64 that is filled with secondary liquid metal, which is auxiliary equipment, and a cold trap 11 that purifies secondary liquid metal are installed in a large storage structure 67 for storage. It is suspended from the upper deck 68 on the structure 67. The dump tank storage structure 67 is placed almost directly below the steam generator 17. A seal structure 69 is provided between the ring girder 50 supporting the steam generator 17 and the storage structure 67, and the atmosphere inside and outside is shut off.
[0069]
The piping connecting the steam generator 17, the dump tank 64, and the cold trap 11 is routed in the storage structure 67. The cold trap 11 is provided with a heater capable of raising the temperature up to 500 ° C., and the cover gas in the cold trap 11 is connected to a vacuuming device (not shown).
[0070]
According to the present embodiment, when the dump tank 64, the cold trap 11 and the liquid metal pipe are arranged in a concentrated manner, when the liquid metal leaks from the equipment and the pipe, the leaked liquid metal is stored in the dump tank protective container 65. In addition, it can be received in the large-sized storage structure 67 and the leakage event can be terminated without taking out the leaked liquid metal out of the system, and the liquid metal leakage countermeasure equipment associated therewith can be reduced. In addition, the cold trap can be regenerated even during plant operation, and replacement cold traps, replacement work, and the like can be deleted.
[0071]
  Next, according to FIG.RealForm of applicationConfiguration other than aboveWill be explained.
  In the present embodiment, a plurality of dam plates 71 are erected on the bottom 70 in the large storage structure 67 shown in FIG. 6, and a storage pot 72 for leaking liquid metal is provided in the large storage structure 67. 72, a communication pipe 73 is provided through the upper deck 68 from inside, an inert gas supply pipe 74 is provided in the large storage structure 67, and the inert gas supply pipe 74 is connected to the inert gas supply device 75. It is in.
[0072]
Accordingly, a communication pipe 73 for transferring the leaked liquid metal and a storage pot 72 for storing the leaked liquid metal are installed in the large storage structure 67. A plurality of barrier plates 71 are arranged at the bottom of the large storage structure 67 so that the leaked liquid metal overflowing from the storage pot 72 does not spread over the entire bottom 70 of the large storage structure 67. Further, in order to suppress the combustion of the leaked liquid metal stored in the large storage structure 67, the large storage structure 67 includes, for example, CO.₂An inert gas injection device 75 such as is connected.
[0073]
By providing the storage pot 72 in the large storage structure 67 with the above configuration, when the leakage scale is small, the leaked liquid metal transferred by the communication pipe 73 is temporarily stored in the storage pot 72, and the large storage structure Combustion of the liquid metal in the object 67 can be prevented. In addition, when the leakage scale is large, the leaked liquid metal overflowing the storage pot 72 spreads to the bottom 70 of the storage structure 67 by the dam plate 71 provided at the bottom 70 of the large storage structure 67, and the bottom 70 as a whole. Can prevent the burning of liquid metal. Furthermore, when liquid metal leaks, CO₂It is possible to extinguish suffocation in the storage structure 67 by injecting an inert gas such as.
[0074]
  Next, referring to FIG.The firstEmbodiment 4 will be described.
  This embodiment is shown in FIG.LeftAlthough the intermediate heat exchanger 2 on the side is not shown, it is actually installed. The present embodiment is different from the third embodiment in that a long enclosure 76 that surrounds the entire periphery except the lower end plate 19 of the steam generator 17 and extends from the upper end to the top of the skirt 40 is provided. Communicating long enough to penetrate the upper deck 68 from the bottom of 76 to the large storage structure 67TubeIt is in providing. The other parts are the same as in FIG.
[0075]
  That is, in this embodiment, a long enclosure 76 is provided outside the steam generator 17, and the lower end thereof is connected to the skirt 40 that supports the steam generator 17 and sealed. Further, the connection part between the skirt 40 and the long enclosure 76 is a communication for transferring the liquid metal leaked when the main body 20 of the steam generator 17 is damaged to the large storage structure 67.Tubeis set up.
[0076]
According to the present embodiment, even when the main body 20 of the steam generator 17 is damaged, the leaked liquid metal can be stored in the large storage structure 67 without flowing out of the system, resulting in a liquid metal leakage event. If this happens, the effect can be minimized.
[0077]
  Next, a connection example between the coil 77 of the electromagnetic pump 28 shown in FIG. 1A and the variable frequency power supply device 78 will be described with reference to FIGS..
[0078]
9 (a) and 9 (b), the electromagnetic pump 28 can be operated in the direction opposite to the normal operation in the discharge direction of the liquid metal. Connected with 79.
[0079]
During normal operation, the electromagnetic pump 28 has one U phase 80, V phase 81, and W phase 82 on the electromagnetic pump coil 77 side as shown in FIG. To the U-phase 83, V-phase 84, and W-phase 85 on the variable frequency power supply 78 side, and are supplied with power. Further, as shown in FIG. 9B, the electromagnetic pump 28 has a U-phase 80 and a V-phase 81 connected to the V-phase 84 and the U-phase of the variable frequency power supply 78 by a switch (not shown) from the operation control room, for example. By switching the connection with 83, the direction of the discharge flow rate from the electromagnetic pump 28 can be changed.
[0080]
According to the present embodiment, it is possible to reverse the discharge direction of the electromagnetic pump 28 by changing the coil wiring of the electromagnetic pump 28 main body side and the variable frequency power supply device 78 side according to the operation mode, and the cold leg piping Rapid drainage of liquid metal at the time of breakage and early siphon break are possible.
[0081]
  Next, referring to FIG.LiquidA fifth embodiment of cooling equipment for a body metal cooled nuclear reactor will be described.. BookIn the embodiment, the lower end plate 83 of the steam generator 17 passes through the lower end plate 19 and is attached to the lower end plate 19 as a concentric double tube. It is provided until it reaches the vicinity of the bottom surface in the dump tank 64. A seal bellows 85 is provided between the outer surface of the downcomer pipe 83 and the dump tank 64 to be hermetically sealed.
[0082]
A cold trap 11 is provided in the dump tank 64 via a cold trap protective container 66. A short purification system pipe 86 is provided below the cold trap 11, and the front end of the short purification system pipe 86 is open near the bottom of the dump tank 64.
[0083]
The dump tank 64 is stored in a dump tank protective container 65, and a large storage structure 67 is provided outside the dump tank protective container 65. The dump tank 64 includes the dump tank protective container 65 and a large storage structure. It is double protected by object 67.
[0084]
Connected to the lower part of the steam generator 17 are a dump tank 64 as auxiliary equipment of the cooling system and a downcomer 83 connected to the lower end plate 19 of the steam generator 17. The cold liquid metal heat-exchanged in the heat transfer tube 21 (see FIG. 1) in the steam generator 17 is released into the secondary sodium dump tank 64 through the downcomer 83.
[0085]
  Thereafter, it passes through the ascending pipe 84 concentrically arranged in the downcomer pipe 83, and the inner part shown in FIG.Tube27, the pressure is raised by the electromagnetic pump 28, and then returned to the intermediate heat exchanger 2 via the cold leg pipe 48 as shown in FIG. The dump tank 64 includes a cold trap 11, and the liquid metal in the dump tank 64 is purified by the cold trap 11.
[0086]
Thus, according to the present embodiment, since the dump tank 64 is joined and combined with the steam generator 17, the piping and valves necessary for the filling drain can be deleted. In addition, since the cold trap 11 is built in the dump tank 64, it is possible to delete piping and valves for liquid metal purification. Furthermore, along with the elimination of these pipes and valves, it is possible to reduce liquid metal leakage countermeasure facilities such as liners, leading to improved plant reliability, such as reducing plant costs and reducing the possibility of liquid metal leakage.
[0087]
  Next, referring to FIG.LiquidA sixth embodiment of cooling equipment for a body metal cooled nuclear reactor will be described.. YouThat is, in this embodiment, the concentric descending pipe 83 and the ascending pipe 84 in the fifth embodiment are divided, and the small diameter descending pipe 87 and the small diameter ascending pipe 88 are passed through the lower end panel 19 to lower the lower end panel. 19 is in the installation. Other parts are the same as those of the fifth embodiment. The down pipe 87 and the up pipe 88 are each provided with an on-off valve 89, and a seal bellows 90 is provided between the dump tank 64 and the dump tank 64.
[0088]
  Connected to the lower part of the steam generator 17 are a dump tank 64, which is auxiliary equipment for the cooling system, and a downcomer 87 connected to the lower end of the steam generator 17. The cold liquid metal heat-exchanged by a heat transfer pipe (not shown) in the steam generator 17 is released into the dump tank 67 through the down pipe 87, and then the up pipe installed independently of the down pipe 87 88, the riser 88 is shown in FIG.Tube27, the pressure is increased by the electromagnetic pump 28 (see FIG. 1), and then returned to the intermediate heat exchanger 2 via the cold leg pipe 48 as shown in FIG.
[0089]
According to the present embodiment, in addition to the effects described in the fifth embodiment, the small diameter rising pipe 88 is provided independently, and the valves are installed in the respective pipes, whereby the steam generator 17 and the secondary generator are provided. Physical separation from the main piping is possible, and maintenance and repair work for electromagnetic pumps and steam generators becomes easy.
[0090]
【The invention's effect】
According to the present invention, the length of the secondary main pipe is greatly shortened, and the amount of pipes and the amount of buildings can be reduced. In addition, the liquid metal leakage countermeasure facility can be rationalized, the possibility of liquid metal leakage can be greatly reduced, and the safety and reliability of the plant can be improved.
[Brief description of the drawings]
FIG. 1 (a) is a longitudinal sectional view partially showing a side view of a first embodiment of a cooling facility for a liquid metal cooled nuclear reactor according to the present invention, and FIG. 1 (b) is an AA arrow in FIG. The top view seen from the viewing direction.
2 is an enlarged perspective view of the enclosure portion in FIG.
FIG. 3 is a device layout diagram for explaining a pipe connection state for connecting the steam generator and the intermediate heat exchanger in FIG. 1;
FIG. 4 is an apparatus layout diagram showing a second embodiment of cooling equipment for a liquid metal cooled nuclear reactor according to the present invention.
5A is a transverse sectional view showing a first example of the double heat transfer tube in FIG. 1 or FIG. 4, and FIG. 5B is a transverse sectional view showing a second example.
FIG. 6 is an apparatus layout diagram showing a third embodiment of cooling equipment for a liquid metal cooled nuclear reactor according to the present invention.
7 is a longitudinal sectional view schematically showing the storage structure in FIG. 6 and its interior. FIG.
FIG. 8 is an apparatus layout diagram showing a fourth embodiment of cooling equipment for a liquid metal cooled nuclear reactor according to the present invention.
9A is a connection diagram illustrating an example of connection between the electromagnetic pump coil and the variable frequency power source in FIG. 8, and FIG. 9B is a connection diagram illustrating another example of FIG.
FIG. 10 is a device layout diagram showing a fifth embodiment of cooling equipment for a liquid metal cooled nuclear reactor according to the present invention.
FIG. 11 is a device layout diagram showing a sixth embodiment of cooling equipment for a liquid metal cooled nuclear reactor according to the present invention.
FIG. 12 is an apparatus layout diagram showing cooling equipment of a conventional liquid metal cooled nuclear reactor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Primary system piping, 2 ... Intermediate heat exchanger, 3 ... Hot leg piping, 4 ... Steam generator, 5 ... Middle leg piping, 6 ... Secondary main circulation pump, 7 ... Cold leg piping, 8 ... Feed water piping, 9 ... Main steam piping, 10 ... Purification piping, 11 ... Cold trap, 12 ... Drain piping, 13 ... Dump tank, 14 ... Discharge piping, 15 ... Rupture disk, 16 ... Container, 17 ... Steam generator (present invention) , 18 ... Upper end plate, 19 ... Lower end plate, 20 ... Body barrel, 21 ... Heat transfer tube, 22 ... Heat transfer tube bundle, 23 ... Steam tube plate, 24 ... Water supply tube plate, 25 ... Steam tube stand, 26 ... Water supply stand 27 ... Inner cylinder, 28 ... Electromagnetic pump, 29 ... Liquid metal inlet nozzle, 30 ... Pump outlet nozzle, 31 ... Connecting pipe, 32 ... Liquid metal outlet nozzle, 33 ... Weir, 34 ... Liquid metal, 35 ... Upper plenum, 36 ... Pump casing, 37 ... Enclosure, 38 ... Support flange, 39 ... Flat plate, 40 ... Skirt, 41 ... Inert gas atmosphere, 42 Stop valve, 43 ... Gas vent pipe, 44 ... Branch pipe, 45 ... Heat transfer pipe water leak detection system, 46 ... Return pipe, 47 ... Instrumentation well, 48 ... Short cold leg pipe, 49 ... Short hot leg pipe, 50 ... Ring girder , 51 ... Straight pipe type short discharge piping, 52 ... Bellows, 53 ... Short drain piping, 54 ... Stop valve, 55 ... Bellows, 56 ... Short purification piping, 57, 58 ... Open / close valve, 59 ... Bellows, 60 ... Inner pipe, 61 ... Outer pipe, 62 ... Porous metal layer, 63 ... Semicircular groove, 64 ... Vertical dump tank, 65 ... Dump tank protective container, 66 ... Cold trap protective container, 67 ... Large storage structure , 68 ... Upper deck, 69 ... Seal structure, 70 ... Bottom, 71 ... Dam plate, 72 ... Storage pot, 73 ... Communication pipe, 74 ... Inert gas supply piping, 75 ... Inert gas supply device, 76 ... Long Shaft enclosure, 77 ... Electromagnetic pump coil, 78 ... Variable frequency power supply, 79 ... Bus, 80 ... U phase, 81 ... V phase, 82 ... W phase, 83 ... Fucan, 84 ... risers, 85 ... sealing bellows, 86 ... short and small purification system pipe, 87 ... small-diameter downcomer, 88 ... small-diameter riser 89 ... off valve 90 ... sealing bellows.

Claims (6)

In a cooling facility for a liquid metal cooled nuclear reactor in which an intermediate heat exchanger disposed in a nuclear reactor building and a steam generator are connected by piping, the steam generator has an upper end plate and a lower end plate at both upper and lower ends. A main body cylinder that is closed and through which liquid metal flows, a heat transfer pipe disposed in the main body cylinder, and a water supply pipe plate and a steam pipe plate that are provided in the main body cylinder and connected to a bundle of the heat transfer tubes are fixed. to the water supply pipe base and vapor tube stand, the inner tube provided in the tube bundle of the heat transfer tube, and an electromagnetic pump which is installed in the inner cylinder, and the liquid metal inlet nozzle provided on the body trunk, the upper An enclosure that protrudes from the end plate and holds an inert gas inside and surrounds the discharge side space of the electromagnetic pump, a pump outlet nozzle that is connected to the electromagnetic pump and is provided in the enclosure, and a pump outlet nozzle said is connected And down closure in connecting duct formed by providing a provided instrumentation well, liquid metal cooled nuclear reactor cooling system, characterized by comprising a liquid metal outlet nozzle connected to the communication pipe. In a cooling facility for a liquid metal cooled nuclear reactor in which an intermediate heat exchanger installed in a reactor building and a steam generator are connected by piping, the upper and lower ends of the steam generator are closed by upper and lower end plates. A main body cylinder through which liquid metal flows, a heat transfer pipe disposed in the main body cylinder, a water supply pipe plate provided in the main body cylinder and connected to a tube bundle of the heat transfer tubes and a water supply pipe for fixing the steam pipe plate and the nozzle and the steam nozzle stub, and the lower end plate through the riser, which is inserted into the body in the body, and an electromagnetic pump disposed in said body cylinder, wherein the liquid metal on the outside of the riser A downward pipe provided concentrically with a flow path, having a dump tank inserted through a lower deck of the steam generator and inserted through the lower part of the upward pipe and the downward pipe. Cooling equipment for liquid metal cooled nuclear reactors. The cooling facility for a liquid metal cooled nuclear reactor according to claim 2, wherein a cold trap is arranged in the dump tank. The heat transfer tube is a concentric double heat transfer tube composed of an inner tube and an outer tube, formed in a helical coil shape, and a braided wire is filled between the inner tube and the outer tube. The cooling facility for a liquid metal cooled nuclear reactor according to claim 2 . Wherein the downcomer and separating the riser, the liquid metal cooled nuclear reactor cooling system, respectively according to claim 2, characterized in that formed by placing the lower end plate in through independent. 6. The cooling facility for a liquid metal cooled nuclear reactor according to claim 5 , wherein stop valves are respectively installed in the downcomer and the upcomer.

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