JP4621729B2 - Boiling water reactor - Google Patents

Description

  The present invention relates to a low-pressure drain tank that is a part of a circulation loop of a feed water heating system of a boiling water reactor, and also relates to a condenser, and in particular, non-condensable gases such as oxygen and hydrogen generated in a reactor pressure vessel The present invention relates to a boiling water reactor that improves the efficiency of extraction.

  In boiling water reactors, the steam generated in the reactor pressure vessel is sent to the steam turbine through the main steam system piping, where the steam used for work is condensed in the condenser, and then this condensation is performed. Water is sent to a water supply system via a condensate pump, a deaerator, etc. by a condensate pump, and is circulated to the reactor pressure vessel as reactor water supply through this water supply system.

  The water supply system is provided with a water supply pump and a low-pressure water supply pump and a high-pressure water supply pump arranged on the downstream side of the water supply pump as a boundary in order to provide water supply power.

  Each of these feed water heaters is composed of a plurality of units. A large number of heating pipes are arranged in the cylinder, turbine bleed air or other steam is circulated in the cylinder, and feed water is passed through the heating pipe. The feed water is heated by heat exchange at the peripheral wall of the heating tube, thereby improving the thermal efficiency.

  FIG. 22 is a system diagram showing a schematic configuration of the circulation loop of the feed water heating system of such a boiling water reactor.

As shown in FIG. 22, the water circulated by the pump 203 becomes steam due to the heat generated in the core 202 in the reactor pressure vessel 201. The steam is made into steam having a high degree of dryness by the steam separator 219 and the steam dryer 220, and after working on the turbine 205 through the main steam pipe 204, the steam is cooled by the condenser 206, thereby causing non-condensation such as oxygen. The condensed water containing gas is pressurized by the low-pressure condensate pump 207 and then reaches the air extractor 208. The air partially extracted by the air extractor 208 is processed by the off-gas processing system 209, and the gas having a low radioactivity level that is less than the allowable value is exhausted from the exhaust pipe 210.

  Further, the condensed water is pressurized by the high-pressure condensate pump 211, passes through a plurality of low-pressure feed water heaters 214 and 215, and is further sent to the high-pressure feed water heater 217 by the feed water pump 221. In this process, the high-temperature high-pressure water circulates in a circulation path that is sent from the water supply pipe 218 into the reactor pressure vessel.

On the other hand, a part of the condensed water heated by the multistage feed water heaters 214 and 215 is guided to the low-pressure drain tank 213. It is in the low pressure drain tank 213 for processing by sucking oxygen contained in the condensed water, the non-condensable gas such as hydrogen off-gas extractor 216 with off-gas treatment system 209.

Here, the outline | summary of a structure of the low pressure drain tank 213 and its peripheral device, and the flow of the condensed water from a feed water heater are shown in FIG. The condensed water that has passed through the low-pressure feed water heater 214 remains with a non-condensable gas such as oxygen as the upper limit of saturation solubility. This must be monitored as the dissolved oxygen concentration at the plant and controlled to be below a certain value.

  The condensed water flowing from the low-pressure feed water heater 214 into the drain tank 213 hits the collision plate 222 provided in front of the inflow port and flows down to the lower part of the drain tank 213. Then, it is guided to the low pressure drain pump 212. Further, an off-gas extractor 216 is connected to the upper portion of the drain tank 213 in order to suck non-condensable gas.

  A schematic configuration of the condenser 206 is shown in FIG. The condenser 206 includes a heat transfer pipe 232 into which seawater sent from the cooling water supply system 231 is guided and a plate 233 arranged to be inclined downward, and an outlet steam of the turbine 205 is supplied to the steam inflow pipe 230. After passing through the heat transfer pipe 232, the seawater sent from the cooling water supply system 231 to the condenser 206 is subjected to heat exchange inside and outside the tube group, and flows down to the inclined plate 233 as condensed water, and then the low-pressure condensate pump 207. To.

  At this time, when the condensed water flows down to the liquid level 224, it is not preferable that the non-condensable gas due to gas entrainment is dissolved in the condensed water.

  In the circulation loop of the feed water heating system of the boiling water reactor having such a configuration, the condensed water that has passed through the low pressure feed water heater 214 remains with a non-condensable gas such as oxygen as the upper limit of saturation solubility as shown in FIG. ing. In particular, since dissolved oxygen may oxidize and corrode piping, furnace structures, etc., it is necessary to remove the dissolved oxygen and return the condensed water to the water supply system. For this reason, it is necessary to monitor the dissolved oxygen concentration at the plant and control it to be below a certain value.

  The condensed water flowing into the low pressure drain tank 213 from the low pressure feed water heater 214 hits the collision plate 222 and flows down to the lower portion, and is guided to the low pressure drain pump 212 through the donut plate 223. An off-gas extractor 216 is connected to the low-pressure drain tank 213, and non-condensable gas is sucked into the off-gas extractor 216. At this time, since the sucked non-condensable gas is eluted only from the surface of the condensed water and extracted into the gas space, it is preferable that the surface area in contact with the condensed water gas space is large.

  However, in the configuration described above, the gas is caught in the condensed water by the flow of the condensed water, in particular, the waterfall flow, so that the supply water contains a lot of dissolved oxygen and the like, which may cause corrosion of the piping, the core structure material, etc. is there.

  Further, as shown in FIG. 24, in the condenser 206, the outlet steam of the turbine 205 is guided to the condenser 206 through the steam inflow pipe 230, and the seawater sent from the cooling water supply system 231 is passed through the heat transfer pipe 232. After exchanging heat inside and outside the tube group and flowing down to the plate 233 as condensed water, the low pressure condensate pump 207 is reached.

  At this time, when the condensed water flows down to the liquid level 224, the non-condensable gas due to gas entrainment is dissolved in the condensed water. In particular, when the gas is caught in the condensed water by the waterfall flow, a lot of dissolved oxygen or the like is contained in the feed water as in the low-pressure drain tank 213, which may cause corrosion of the piping, the core structure material, and the like.

  As described above, the non-condensable gas in the feed water, particularly dissolved oxygen, may cause corrosion of the structural material and the like, which may reduce the structural integrity. Further, when a large amount of non-condensable gas is contained in the feed water, the latent heat per unit weight is reduced when water is boiled in the core, leading to a decrease in thermal efficiency.

  The present invention has been made in view of such circumstances, and by preventing a large amount of non-condensable gas from being contained in the feed water, latent heat per unit weight can be increased at the time of boiling of water in the core, and thermal efficiency An object of the present invention is to provide a boiling water reactor capable of improving the temperature.

  In order to achieve the above object, the present invention constitutes a boiling water reactor by the following means.

In the invention corresponding to claim 1, the steam generated in the reactor pressure vessel is supplied to the steam turbine through the main steam system piping, and the steam that has driven the steam turbine is condensed in the condenser. sends this condensed water to the water supply system through the heater and the deaerator by the condensate pump, in a boiling water reactor to circulate as the reactor feedwater in nuclear reactor pressure vessel, said condenser cooling water inside A plate surface provided with a heat transfer pipe to which cold water sent from the water supply system is guided and a plate disposed therebelow, and receiving condensed water that is exchanged by the heat transfer tube immediately below the liquid level in the condensate reservoir and flows down from the plate A perforated plate having a plurality of holes is provided horizontally.

The invention corresponding to claim 2 is that steam generated in the reactor pressure vessel is supplied to the steam turbine via the main steam system pipe, and the steam that has driven the steam turbine is condensed in the condenser, sends this condensed water to the water supply system through the heater and the deaerator by the condensate pump, in a boiling water reactor to circulate as the reactor feedwater in nuclear reactor pressure vessel, said condenser cooling water inside A waterfall flow from a downcomer pipe having a heat transfer pipe to which cold water sent from a water supply system is guided and a plate disposed below the heat transfer pipe, and a receiving container is provided in a condensate falling part flowing down from the plate, The perforated saucer for receiving is horizontally provided.

In the invention corresponding to claim 3, after the steam generated in the reactor pressure vessel is supplied to the steam turbine via the main steam system piping, the steam that has driven the steam turbine is condensed in the condenser, sends this condensed water to the water supply system through the heater and the deaerator by the condensate pump, in a boiling water reactor to circulate as the reactor feedwater in nuclear reactor pressure vessel, said condenser cooling water inside Corresponding to the lower part of the downcomer pipe that has a heat transfer pipe to which cold water sent from the water supply system is guided and a plate disposed below it, and a receiving container is provided at the falling part of the condensate that flows down from the plate The donut-shaped pipe having a large number of outflow holes on the peripheral surface is arranged horizontally around the downcomer pipe, and the donut-shaped pipe and the downcomer pipe are connected by a plurality of communication pipes. It is a thing.

  In the boiling water reactor of the invention corresponding to the first and third aspects of the present invention, it is possible to prevent a large amount of noncondensable gas from being contained in the feed water, and per unit weight when water is boiled in the reactor core. The latent heat can be increased and the thermal efficiency can be improved.

  According to the present invention, by preventing the non-condensable gas from being contained in a large amount in the feed water, the boiling water that can increase the latent heat per unit weight at the time of boiling the water in the core and improve the thermal efficiency. A type nuclear reactor can be provided.

  Embodiments of a boiling water reactor according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a low-pressure drain tank provided in a part of a circulation loop of a feed water heating system and a peripheral portion thereof in the first embodiment of the present invention, and the same parts as those in FIG. A description will be given.

  Note that the overall configuration is substantially the same as that shown in FIG. 21, and a description thereof will be omitted here.

  In the first embodiment, as shown in FIG. 1, the pipe 1 for introducing condensed water from the low-pressure feed water heater 214 to the low-pressure drain tank 213 is disposed horizontally through the wall surface of the low-pressure drain tank 213, The opening of the pipe 1 located in the tank is closed by an end plug 2, and a plurality of outflow holes 4 are arranged in a staggered manner on the peripheral surface of the pipe. In this case, an outflow hole 4 is also provided for the end plug 2.

  According to the first embodiment having such a configuration, condensed water containing non-condensable gas such as oxygen and hydrogen generated in the reactor pressure vessel 201 is piped from the low-pressure feed water heater 214 to the low-pressure drain tank 213. 1, the condensed water can be ejected as droplets 3 from a plurality of outflow holes 4 provided in the pipe 1 and scattered.

Here, if the outflow holes 4 have a radius R, the pitch P with respect to the axial direction and the number M in the circumferential direction, the total number N = P × M, and the total number H of the outflow holes in the end plug 2 The total opening area of these outflow holes 4 is πR ² × (N + H).

  Accordingly, by flowing out as droplets 3 from each outflow hole 4, the surface area in contact with the space in the low-pressure drain tank 213 is larger than in the state of flowing down uniformly as in the prior art, and from the surface of the droplets. Elution of non-condensable gas increases. For this reason, a large amount of non-condensable gas can be sucked by the off-gas extractor 216.

  As described above, according to this embodiment, a large amount of non-condensable gas is extracted from the surface of the condensed water in the form of droplets 3 into the gas space, so the concentration of non-condensable gas such as dissolved oxygen in the feed water Can be reduced.

  In the above embodiment, the case where the plurality of outflow holes 4 are arranged in a staggered manner on the circumferential surface of the pipe has been described. However, the outflow holes 4 provided in the pipe 1 are equally spaced in the axial direction and the circumferential direction. They may be arranged in a square shape, or may be arranged in a staggered state or a square shape only on the peripheral surface of the upper half.

  Further, as shown in FIGS. 2A and 2B, the plurality of outflow holes 4 may be arranged in a staggered state or a square shape only on the peripheral surface of the lower half of the pipe 1. By providing the outflow holes 4 only on the peripheral surface of the lower half of the pipe 1 in this manner, the droplets 3 do not overlap each other, so that the surface area in contact with the space is increased and non-condensable from the droplet surface. Increased gas elution.

In the above embodiment, the case where a plurality of outflow holes 4 having the same diameter are provided in the pipe 1 inserted horizontally in the low-pressure drain tank 213 has been described. or arranging the outlet hole 4 was gradually increased pore diameter toward the upstream side of, be or arranged outlet hole 4 which pore diameter is gradually reduced to the contrary, the advantages of the above same as be able to.

  Furthermore, although the case where the circular outflow hole 4 is provided in the pipe 1 has been described in the above embodiment, an outflow hole in which a part of the circular shape is cut off may be used. Furthermore, the shape of the outflow hole may be an outflow hole in which a part of a triangle, a square, a star, or a circle protrudes inward.

Be thus provided with different outflow hole shapes in the pipe 1, it is possible to obtain the advantageous effects mentioned above as well.

  FIG. 3 shows a part of a pipe for horizontally introducing condensate containing non-condensable gas such as oxygen and hydrogen supplied from a low-pressure feed water heater according to the second embodiment of the present invention into a low-pressure drain tank. FIG.

  In the second embodiment, as shown in FIGS. 3 (a) and 3 (b), a plurality of constricted outflow holes 12 obtained by drawing the outlet side on the peripheral surface of the pipe 1 located in the low pressure drain tank 213 are provided. It is provided with appropriate intervals in the circumferential direction and the axial direction.

  Here, instead of the above configuration, as shown in FIG. 3 (c), a plurality of constricted outflow holes 13 whose center portions are drawn on the peripheral surface of the pipe 1 are provided at appropriate intervals in the circumferential direction and the axial direction. You may make it provide. Further, as shown in FIG. 3 (d), a plurality of constricted outflow holes 14 in which the inlet side is drawn on the peripheral surface of the pipe 1 may be provided at appropriate intervals in the circumferential direction and the axial direction. .

  With such a configuration, the condensed water containing a non-condensable gas such as oxygen is once squeezed at the squeezed portion of the squeezed outflow hole, or is diffused after being squeezed, into the low pressure drain tank 213. Since it is ejected, the condensed water tends to become droplets when it flows out from each outflow hole. As a result, the non-condensable gas is more eluted from the droplet surface as in the above-described embodiment, and a large amount of non-condensable gas can be sucked by the off-gas extractor.

  Therefore, according to the present embodiment, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so the concentration of non-condensable gas such as dissolved oxygen in the feed water Can be reduced.

  In the second embodiment, the case where the flow rate of the condensed water is increased by providing the outflow holes 12, 13, 14 having the throttle portions on the peripheral surface of the pipe 1 located in the low pressure drain tank 213 has been described. Instead of providing the portion, a baffle plate may be provided at the outlet portion of each outflow hole.

  In this case, a pair of plate-shaped baffles may be arranged to cross at the center of the hole at the outlet of each outflow hole, and a disc-shaped block at the center of the outlet of each outflow hole. A plate may be provided.

  Thus, by providing the baffle plate in each outflow hole, the condensed water containing a non-condensable gas such as oxygen becomes droplets from each outflow hole with a flow velocity distribution according to the arrangement of the baffle plate, and the low pressure drain tank 213. It can be ejected and scattered inside. As a result, as in the above-described embodiment, non-condensable gas is more eluted from the droplet surface, and a large amount of non-condensable gas can be sucked by the off-gas extractor 216.

  Therefore, as described above, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so that the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  Furthermore, as a means for increasing the flow rate of the condensed water and ejecting it as droplets, one end of the injection nozzle may be inserted into each outflow hole provided in the pipe 1.

  With such a configuration, condensed water containing a non-condensable gas such as oxygen can be jetted and scattered as droplets 3 from the jet nozzle into the low-pressure drain tank 213, so that it is the same as in the above-described embodiment. In addition, the elution of noncondensable gas from the droplet surface increases, and a large amount of noncondensable gas can be sucked by the off-gas extractor 216.

  FIG. 4 shows a part of a pipe for horizontally introducing condensed water containing non-condensable gas such as oxygen and hydrogen supplied from a low-pressure feed water heater according to the third embodiment of the present invention into a low-pressure drain tank. FIG.

  In the third embodiment, as shown in FIG. 4, a plurality of outflow holes 4 are provided in the circumferential direction and the axial direction on the peripheral surface of the pipe 1, and the swirl jet nozzles 17 are made to correspond to the respective outflow holes 4. Each is provided.

  With such a configuration, the condensed water containing a non-condensable gas such as oxygen is swung counterclockwise from the swirl jet nozzle 17 to be ejected and scattered as a droplet 3 into the low-pressure drain tank by centrifugal force. Therefore, the elution of the non-condensable gas from the droplet surface increases as in the above-described embodiment, and a large amount of the non-condensable gas can be sucked by the off-gas extractor.

  In the third embodiment, the swirl nozzle 17 is provided in each outflow hole 4, but instead of this, a plurality of oblique outflow holes are provided in the circumferential direction on the peripheral surface of the pipe 1 located in the low-pressure drain tank. An appropriate interval may be provided in the axial direction.

  FIG. 5 is a part of a pipe for horizontally introducing condensed water containing non-condensable gas such as oxygen and hydrogen supplied from a low-pressure feed water heater according to the fourth embodiment of the present invention into a low-pressure drain tank. FIG.

  In the fourth embodiment, as shown in FIG. 5, the opening end of the pipe 1 located in the low-pressure drain tank is closed by a spherical body 19, and the spherical body 19 and the circumferential surface of the pipe 1 are circumferentially and axially arranged. A plurality of outflow holes 4 are provided at appropriate intervals.

  With such a configuration, condensed water containing a non-condensable gas such as oxygen can be ejected and scattered as a droplet 3 from the outflow hole 4 provided in the pipe 1 and the spherical body 19 into the low-pressure drain tank. As a result, the number of locations where the droplets flow out increases, and the amount of non-condensable gas elution from the droplet surface increases as in the above-described embodiment, and a large amount of non-condensable gas is sucked by the off-gas extractor. Can do.

  Therefore, as described above, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so that the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  In the fourth embodiment, the spherical body 19 is provided at the opening end of the pipe 1. Instead, the opening end of the pipe 1 is closed with a wedge-shaped closing body. A plurality of outflow holes 4 may be provided on the circumferential surface with appropriate intervals in the circumferential direction and the axial direction.

  Alternatively, a flat tube having a smaller diameter than that of the pipe 1 may be integrally attached to the opening end of the pipe 1, and a plurality of outflow holes may be provided at appropriate intervals on the lower surface of the flat tube.

  FIG. 6 is a part of a pipe for horizontally introducing condensed water containing a non-condensable gas such as oxygen and hydrogen supplied from a low-pressure feed water heater in a fifth embodiment of the present invention into a low-pressure drain tank. FIG.

  In the fifth embodiment, as shown in FIG. 6, a substantially central portion of the branch-like tube body 22 is attached to the open end of the pipe 1 located in the low-pressure drain tank, and the peripheral surface is attached to the tube body 22. A plurality of outflow holes 4 are provided at appropriate intervals.

  With such a configuration, condensed water containing a non-condensable gas such as oxygen can be ejected and scattered as a droplet 3 from the outflow hole 4 provided in the tube body 22 into the low-pressure drain tank. The number of droplets flowing out increases, and the elution of noncondensable gas from the surface of the droplet increases as in the above-described embodiment, and a large amount of noncondensable gas can be sucked by the off-gas extractor.

  Therefore, as described above, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so that the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  In the fifth embodiment, the branch-like tube body 22 is provided at the opening end of the pipe 1, but instead, the substantially central portion of the U-shaped branching tube body communicates with the opening end of the pipe 1. A plurality of outflow holes 4 are provided on the peripheral surface of the tubular body at appropriate intervals, respectively, or are attached by connecting the substantially central portion of the tubular body that branches in the vertical direction. Even if the plurality of outflow holes 4 are provided on the surface with appropriate intervals, the same effects as described above can be obtained.

  FIG. 7 shows a part of a pipe for introducing condensate containing non-condensable gas such as oxygen supplied from a low-pressure feed water heater into a low-pressure drain tank in a horizontal state in the sixth embodiment of the present invention. FIG.

  In the sixth embodiment, as shown in FIG. 7, a plurality of outflow holes 4 are provided in the circumferential direction and the axial direction, respectively, at appropriate intervals on the peripheral surface of the pipe 1, and on the inner peripheral surface of the pipe 1. A baffle plate 26 is provided so that the flow of condensed water is zigzag in the axial direction.

  With such a configuration, the condensed water containing a non-condensable gas such as oxygen flows in a zigzag manner by the baffle plate 26, so that the non-condensable gas is easily separated from the condensed water. Since it can be ejected and scattered as a droplet 3 from the outflow hole 4 into the low-pressure drain tank, the elution of the non-condensable gas from the droplet surface increases as in the above-described embodiment, and the non-condensable gas is A large amount can be aspirated by an off-gas extractor.

  Therefore, as described above, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so that the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  In the above embodiment, the baffle plate 26 is disposed so that the flow of the condensed water is zigzag-shaped, but instead of this, the spiral guide vanes may be inserted into the pipe 1 in the axial direction. Similar effects can be obtained.

  FIG. 8 shows a part of a pipe for introducing condensate containing non-condensable gas such as oxygen supplied from a low-pressure feed water heater into a low-pressure drain tank in a horizontal state in the seventh embodiment of the present invention. FIG.

  In the seventh embodiment, as shown in FIG. 8 (a), the outflow holes 4 are provided at appropriate intervals in the circumferential direction and the axial direction on the peripheral surface of the pipe 1 located in the low-pressure drain tank. In addition, the horizontal length of the L-shaped fin 28 that is long in the axial direction with the horizontal length gradually shortened from the top to the bottom on the outer peripheral side surface of the pipe 1 In this way, each is attached.

In this case, as shown in FIG. 8 (b), a notch fin 29 having a notch 30 provided substantially at the center of the L-shaped end may be attached to the pipe 1 in the same manner as described above. Further, an L-shaped fin provided with a plurality of notches may be attached to the pipe in the same manner as described above.

  With such a configuration, the condensed water containing a non-condensable gas such as oxygen is ejected from each outflow hole 4 and then flows horizontally on each L-shaped fin 28 to form droplets 3 as a low-pressure drain tank. Can be scattered inside.

  In particular, in the case of 50% and 75% partial load operation where the flow rate does not reach the rated value of 100%, the flow rate from the outflow hole 4 is slow in the low flow rate operation at the start-up, so that the liquid from the adjacent outflow hole 4 is difficult to eject. Although the droplets coalesce and the surface area becomes small, by arranging the L-shaped fins 28 or 30 as in the present embodiment, it is possible to flow down as droplets 3 from both ends of the fins even under low flow conditions. It tends to become droplets and the surface area becomes large. Moreover, since the flow velocity from the outflow hole 4 is large in the 100% rated operation, the droplet 3 is likely to be formed.

  Therefore, similarly to the above-described embodiment, non-condensable gas is more eluted from the droplet surface, and a large amount of non-condensable gas can be sucked by the off-gas extractor.

  Further, as described above, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so that the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

Aforementioned seventh embodiment has been provided an L-shaped fins 28 on the outer circumferential surface of the pipe 1 may be provided with a plurality of outlet holes in the plate surface of the L-shaped fins 28 and the L-shaped fins Instead, the same effect as described above can be obtained even when a flat fin is provided.

  Furthermore, it is good also as a structure which winds a helical fin around the outer peripheral surface of the piping 1 to an axial direction. In this configuration, some of the liquid droplets ejected from the respective outflow holes 4 of the pipe 1 can flow down along the spiral fins, and others can be directly ejected from the outflow holes 4 and scattered. Similar effects can be obtained.

  FIG. 9 shows a part of a pipe for introducing condensate containing non-condensable gas such as oxygen supplied from a low-pressure feed water heater in a horizontal state into a low-pressure drain tank in the eighth embodiment of the present invention. FIG.

  In the eighth embodiment, as shown in FIGS. 9 (a) and 9 (b), a rotating sprinkling perforated blade 34 is rotatably attached to the tip of the pipe 1 at a portion located in the low pressure drain tank 213, and this rotation The condensed water in the pipe 1 is caused to flow out through the opening hole to the sprinkling perforated blade 34 to give rotational energy. In this case, the rotating water sprinkling perforated blade 34 has a flow path of condensed water formed in a bowl shape, and a plurality of outflow holes are provided at the ends thereof.

  With such a configuration, the condensed water containing a non-condensable gas such as oxygen flows into the rotating water sprinkling porous blade 34 that is rotatably attached to the distal end portion of the pipe 1, and its end portion rotates. In the same manner as in the above-described embodiment, non-condensable gas elution from the droplet surface increases and non-condensable. A large amount of sex gas can be sucked by an off-gas extractor.

  Therefore, according to the present embodiment, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so the concentration of non-condensable gas such as dissolved oxygen in the feed water Can be reduced.

  FIG. 10 shows a part of piping for horizontally introducing condensed water containing a non-condensable gas such as oxygen supplied from a low-pressure feed water heater in a ninth embodiment of the present invention into a low-pressure drain tank. FIG.

  In the ninth embodiment, as shown in FIGS. 10 (a) and 10 (b), a portion of the pipe 1 located in the low-pressure drain tank 213 is an inner pipe, and an outer pipe 35 is provided outside the pipe. The structure is such that the outflow holes 4 and 36 are provided in the circumferential direction and the axial direction, respectively, with appropriate intervals on the peripheral surfaces of the pipe 1 and the outer pipe 35.

  Here, the outflow hole 4 provided in the pipe 1 which is an inner pipe and the outflow hole 36 provided in the outer pipe 35 may have the same diameter or a non-uniform diameter, respectively. In addition, when the outflow hole 4 of the pipe 1 and the outflow hole 36 of the outer pipe 35 have the same diameter or nonuniform diameter, the positional relationship between the holes may be shifted from each other.

  With such a configuration, condensed water containing a non-condensable gas such as oxygen flows out from the outflow hole 4 of the pipe 1 and temporarily accumulates in the outer pipe 35, and then drops from the outflow hole 36 of the outer pipe 35. Thus, the non-condensable gas can be eluted from the droplet surface in the same manner as in the above-described embodiment, and the non-condensable gas can be discharged by the off-gas extractor. A large amount can be aspirated.

  FIG. 11 shows a part of a pipe for introducing condensate containing noncondensable gas such as oxygen supplied from a low-pressure feed water heater in a horizontal state into a low-pressure drain tank in the tenth embodiment of the present invention. FIG.

  In the tenth embodiment, as shown in FIG. 11, the pipe 1 is placed in a horizontal state and penetrated through the side wall surface of the low-pressure drain tank 213 and the open end faces the inner wall surface of the tank. A box 38 is attached to the inner wall surface of the low-pressure drain tank so as to surround it, and a plurality of outflow holes 4 are provided on each surface of the box 38.

  With such a configuration, condensed water containing a non-condensable gas such as oxygen flows into the box 38 from the opening end of the pipe 1, and further from the outflow holes 4 provided on each surface of the box 38. Since the droplet 3 can be ejected and scattered in the low-pressure drain tank 213, the non-condensable gas is eluted from the droplet surface in the same manner as in the above-described embodiment, and the non-condensable gas is off-gas extractor. A large amount can be sucked.

  Therefore, as described above, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so that the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  Here, in the tenth embodiment, a baffle plate may be provided in the box 38 so as to face the opening end of the pipe 1. In this way, the condensed water that has flowed out of the pipe 1 once hits the baffle plate, then becomes droplets from the outflow holes 4 provided on each surface of the box 38 and is ejected into the low-pressure drain tank 213 to be scattered. Can do.

  In addition, a U-shaped plate may be provided instead of the box 38, and a plurality of outflow holes may be provided on each surface of the plate, or an L-shaped plate having an open upper portion may be provided, and each surface of the plate may be provided. A plurality of outflow holes may be provided.

  Further, an inverted L-shaped plate having an open lower portion may be provided, and a plurality of outflow holes 4 may be provided on each surface of the plate. A hemispherical plate is provided so as to surround the opening end of the pipe, and its hemispherical surface. A plurality of outflow holes may be provided.

  Even in such a configuration, the same effects as described above can be obtained.

  FIG. 12 shows a part of piping for introducing condensate containing non-condensable gas such as oxygen supplied from a low-pressure feed water heater into a low-pressure drain tank in a horizontal state in the eleventh embodiment of the present invention. FIG.

  In the eleventh embodiment, as shown in FIG. 12, the low pressure drain tank 213 is placed in a horizontal state so as to penetrate the tank side wall surface, and the open end faces the inner wall surface of the tank. An inner box 44 is attached to the inner wall surface of the low-pressure drain tank, and an outer box 45 is provided outside the box 44 to form a double box structure, and a plurality of outflow holes 4 are provided on each surface of each box. It is intended to be provided.

  With such a configuration, condensed water containing a non-condensable gas such as oxygen flows into the inner box 44 from the opening end of the pipe 1, and the outflow holes 4 provided on each surface of the inner box 44. As a droplet 3, it flows out into the outer box 45, and further, it can be ejected as a droplet 3 into the low-pressure drain tank 213 from the outflow holes 4 provided on each surface of the outer box 45 and scattered. As in the above-described embodiment, elution of noncondensable gas from the droplet surface increases, and a large amount of noncondensable gas can be sucked by the off-gas extractor 216.

  Here, instead of the double box-shaped structure, the inner opening plate and the outer opening plate are combined and provided so that they partially wrap, and the inner opening plate and the outer opening plate may be provided with outflow holes. The same effects as described above can be obtained.

  FIG. 13 is a diagram illustrating the configuration of a low-pressure drain tank and its peripheral devices in the twelfth embodiment of the present invention.

  In the twelfth embodiment, as shown in FIG. 13, the pipe 1 for introducing condensed water containing non-condensable gas such as oxygen generated in the reactor pressure vessel from the low pressure feed water heater 214 to the low pressure drain tank 213 is horizontally disposed. The low-pressure drain tank 213 is placed through the wall surface, and a plurality of outflow holes 4 are provided in the circumferential direction and the axial direction on the peripheral surface of the pipe 1 located in the tank. A receiving plate 48 having a large number of holes is provided on the plate surface received before the droplet 3 ejected from each outflow hole 4 of the pipe 1 reaches the liquid level.

  According to the present embodiment having such a configuration, non-condensable gas such as oxygen generated in the reactor pressure vessel can be ejected as droplets 3 from the plurality of outflow holes 4 together with the condensed water and scattered. it can.

Thus, larger surface area as compared with the case where the conventional uniformly flow down condensate as, for elution of non-condensable gases from the droplet surface increases, a large amount of non-condensable gases in the drain tank 21 3 Can be aspirated. Further, the energy generated by the entry of the three liquid droplets into the liquid surface 224 is dispersed by colliding with the perforated plate 48, so that the amount of the gas 225 entrained can be reduced.

  Therefore, according to the present embodiment, in addition to extracting a large amount of non-condensable gas from the surface of the condensed water that has become droplets 3 into the gas space, gas entrainment at the level of the condensed water flowing to the feed water is performed. Since it can reduce, the content concentration of non-condensable gases, such as dissolved oxygen in feed water, can be reduced by both these methods.

  FIG. 14 is a configuration explanatory diagram of a low-pressure drain tank and its peripheral devices in the thirteenth embodiment of the present invention.

  In the thirteenth embodiment, as shown in FIG. 14, a low-pressure feed water heater 214 introduces condensed water containing non-condensable gas such as oxygen generated in a reactor pressure vessel into a low-pressure drain tank 213 as a low-pressure pipe. A vertical pipe 49 that vertically penetrates the lower wall surface of the drain tank 213 and rises vertically in the low-pressure drain tank is disposed, and a plurality of outflow holes 4 are formed on the peripheral surface of the vertical pipe 49 positioned above the liquid level. Are provided in the circumferential direction and the axial direction with appropriate intervals.

  According to the present embodiment having such a configuration, even when the wall surface above the liquid level of the low-pressure drain tank 213 cannot be horizontally penetrated due to the equipment on the piping, the reactor pressure vessel The non-condensable gas such as oxygen generated in step 1 can be ejected as droplets 3 from the plurality of outflow holes 4 together with the condensed water and scattered.

Thus, larger surface area as compared with the case where the conventional uniformly flow down condensate as, for elution of non-condensable gases from the droplet surface increases, a large amount of non-condensable gases in the drain tank 21 3 Can be aspirated.

  Therefore, since a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  In the thirteenth embodiment, as the plurality of outflow holes provided on the peripheral surface above the liquid level of the vertical pipe 49 located in the low pressure drain tank 213, the oblique outflow holes inclined upward from the horizontal by an angle α. May be provided.

  With such an oblique outflow hole, the condensed water is ejected upward as droplets, so that it becomes easy to diffuse.

  FIG. 15 is an explanatory diagram showing a part of a vertical pipe inserted into a low-pressure drain tank according to a fourteenth embodiment of the present invention.

  In the fourteenth embodiment, a plurality of outflow holes 4 are provided in the circumferential direction and the axial direction at appropriate intervals on the circumferential surface of the vertical pipe 49 above the liquid level 224 in the low-pressure drain tank 213, and A plurality of stages of orifices 55 are respectively provided in the pipe so as not to overlap each hole position with an appropriate interval in the axial direction.

According to the present embodiment having such a configuration, since the upper portion of the vertical pipe 49 is inflow of condensed water is adjusted in each room partitioned by a plurality of stages of the orifice 55, the non-condensable such as oxygen The sex gas can be ejected together with the condensed water from the plurality of outflow holes 4 as droplets 3 with controlled flow rates and scattered.

Thus, larger surface area as compared with the case where the conventional uniformly flow down condensate as, for elution of non-condensable gases from the droplet surface increases, a large amount of non-condensable gases in the drain tank 21 3 Can be aspirated.

  Therefore, since a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  In the fourteenth embodiment, a baffle plate may be provided corresponding to each stage through a hole in each central portion of a plurality of stages of orifices 55 provided in the vertical pipe 49.

  Even with such a configuration, the flow velocity of the droplet 3 ejected from the outflow hole 4 is controlled, and the effects can be exhibited more remarkably.

  In the fourteenth embodiment, the case where the orifices are provided in a plurality of stages in the vertical pipe 49 has been described. However, a triangular conical block is placed at the upper end of the vertical pipe 49 in the low-pressure drain tank 213 with its tip facing downward. And adjust the blowout pressure of the condensed water flowing out from each outflow hole 4 so that the gap existing between the triangular conical block and the inner peripheral surface of the vertical pipe 49 continuously extends downward from the upper end. You may make it do.

  In the same manner as described above, a stepped block whose size is gradually reduced from the upper end of the vertical pipe 49 may be attached instead of the triangular cone block taken along the upper end of the vertical pipe 49. Similarly, a baffle plate combining an orifice and a block may be provided.

  FIG. 16 is an explanatory diagram showing a part of a vertical pipe inserted into a low-pressure drain tank in the fifteenth embodiment of the present invention.

In the fifteenth embodiment, as shown in FIG. 16, a plurality of outflow holes 4 are provided in the circumferential direction and the axis with appropriate intervals on the peripheral surface of the vertical pipe 49 above the liquid surface 224 in the low-pressure drain tank 213. respectively in the direction, also each presence an appropriate interval in the axial direction as the outer peripheral surface a plurality of disc-shaped full fin 61 having different diameters in the horizontal state not overlapping with each hole position of the vertical pipe 49 It is intended to be installed.

In this case, the full fin 61 is a cross-sectional L-type raised its outer peripheral edge vertically, a plurality of notch 60 is provided in presence an appropriate interval on the raised portion. Further, the diameter of the fin 61 is made smaller in steps from the uppermost part toward the lowermost part.

  According to this embodiment having such a configuration, when non-condensable gas such as oxygen generated in the reactor pressure vessel is ejected as droplets 3 from the plurality of outflow holes 4 of the vertical pipe 49 together with the condensed water, The droplet 3 accumulates in the fins 61 and can eventually be scattered by flowing down as the droplet 3 again when it overflows from the notch 60. In particular, in the case of partial load operation of 50% and 75%, the flow velocity from the outflow hole 4 is slow, so that droplets from adjacent outflow holes that are difficult to eject are combined and the surface area becomes small. It can be made to flow down from the part 60 as a droplet.

Thus, larger surface area as compared with the case where the conventional uniformly flow down condensate as, for elution of non-condensable gases from the droplet surface increases, a large amount of non-condensable gases in the drain tank 21 3 Can be aspirated. Especially when low flow operation, since the scattered from notch 60 transmitted the full fin 61 as a droplet 3, the effect is even more pronounced.

  Therefore, since a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, the concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  In the above-described embodiment, the fin 61 having the notch portion 60 is attached to the outer peripheral surface of the vertical pipe 49, but the same effect can be obtained even if the fin without the notch portion is attached. .

  In the above embodiment, a plurality of guide vanes are arranged radially between the vertical pipe 49 and the disc-shaped fin 61, and a plurality of radiations are provided on the peripheral edge of the fin 61 with an L-shaped upright portion. The holes may be provided with appropriate intervals.

  With such a configuration, when condensed water flows out from each outflow hole 4 of the vertical pipe 49 to the fin 61 as a droplet, the droplet accumulates in a space surrounded by each guide blade, and eventually becomes an L shape. Since the liquid drops again from the radiation holes in the upper part of the gas flow and flow down into the low-pressure drain tank, the same effect as described above can be obtained.

  FIG. 17 is an explanatory diagram showing a part of a vertical pipe inserted into the low-pressure drain tank in the sixteenth embodiment of the present invention.

In the sixteenth embodiment, as shown in FIG. 17, a plurality of outflow holes 4 are provided in the circumferential direction and the axis with appropriate intervals on the peripheral surface of the vertical pipe 49 above the liquid surface 224 in the low-pressure drain tank 213. respectively in the direction, also it is obtained by a structure for attaching the spiral full fin 68 so as not to overlap with each hole located on the outer peripheral surface of the vertical pipe 49.

According to this embodiment having such a configuration, when non-condensable gas such as oxygen generated in the reactor pressure vessel is ejected as droplets 3 from the plurality of outflow holes 4 of the vertical pipe 49 together with the condensed water, the droplets 3 flows down along the spiral fins 68, but may be scattered by centrifugal force to the low pressure drain reservoir 21 3 by falling as droplets 3 again in the process.

Thus, larger surface area as compared with the case where the conventional uniformly flow down condensate as, for elution of non-condensable gases from the droplet surface increases, a large amount of non-condensable gases in the drain tank 21 3 Can be aspirated. Especially when low flow operation, for scattering as droplets 3 transmitted the spiral full fin 68, the effect is even more pronounced.

  Therefore, according to the present embodiment, a large amount of non-condensable gas is extracted from the surface of the condensed water that has become droplets 3 into the gas space, so the content concentration of non-condensable gas such as dissolved oxygen in the feed water is reduced. Can be reduced.

In the above embodiment has been to attach the spiral full fin 68 as the outer peripheral surface of the vertical pipe 49 do not overlap with each hole location, and presence of the annulus on the outside and the inner tube of the vertical pipe Even if a vertical double pipe structure with an outer pipe is provided and a plurality of outflow holes are provided around the inner pipe and the outer pipe at appropriate intervals in the circumferential direction and the axial direction, the same effect as described above. An effect can be obtained.

  FIG. 18 is a cross-sectional view showing a schematic configuration of the condenser and its vicinity in the seventeenth embodiment of the present invention. The same parts as those in FIG.

  As shown in FIG. 18, the condenser 206 includes a heat transfer pipe 232 into which seawater sent from the cooling water supply system 231 is guided and a plate 233 disposed below the heat transfer pipe 232. After the seawater sent from the cooling water supply system 231 through the inflow pipe and sent from the cooling water supply system 231 exchanges heat inside and outside the tube group through the heat transfer pipe 232 and flows down to the plate 233 as condensed water, the low pressure condensate pump 207.

In the seventeenth embodiment, in the condenser 206 having such a configuration, the porous plate 101 is provided horizontally in the vicinity of the upper part of the liquid level of the condensate reservoir. The perforated plate 101 has a plurality of outflow holes 102 provided on the plate surface at appropriate intervals.

According to a seventeenth embodiment of such a configuration, condensate enters from the plate 233 to the liquid surface 224 as condensed water heat exchanger comprising a non-condensable gas such as oxygen generated in the reactor pressure vessel After the energy at the time collides with the perforated plate 101 and is dispersed, it is dropped as the droplet 103 from the outflow hole 102, whereby the amount of gas accompanying from the liquid surface 224 can be reduced. Therefore, the content concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  In the seventeenth embodiment, the condensed water is directly collided from the plate 233 to the porous plate 101. However, a baffle plate is provided horizontally between the plate 233 and the porous plate 101, and a non-condensable gas is provided. Even if the energy when the condensate contained enters the liquid surface 224 is collided with the baffle plate 104 and the horizontal perforated plate 101 in two stages and dispersed, the same effects as those of the above embodiment can be obtained.

Further, in the embodiment of the seventeenth, disposed stepwise by a plurality of Flip Yama plate below the plate 233 without providing the porous plate horizontally, condensed water is sequentially flow down from the upper stage to the lower stage, be allowed to fall into the condensate puddle as droplets from Flip lowermost Yamaban can be obtained above same effect.

  Here, each baffle plate may be provided with a plurality of flow holes and the liquid droplets may be dropped from the flow holes.

  Further, in the seventeenth embodiment, a weir for storing condensed water flowing down from the plate 233 is provided horizontally below the plate 233 without providing a porous plate so that the condensed water gradually overflows from this weir. Also good.

  Further, in the seventeenth embodiment, a plurality of mountain-shaped plates are arranged horizontally below the plate 233 without providing a porous plate, and the condensed water flowing down from the plate 233 collides with the mountain-shaped plate 114. Thus, even if the energy when condensate containing a non-condensable gas such as oxygen enters the liquid surface 224 is dispersed, the same effect as described above can be obtained.

  In the seventeenth embodiment, there is provided a tray having a plurality of outflow holes on the bottom surface of the bottom of the plate 233 without inserting a perforated plate and having a gold scrubbing inserted therein, and flows down from the plate 233 to the tray. Even if the condensed water is collided with the receiving tray and then the condensed water is dropped as a droplet from the outflow hole, the same effect as described above can be obtained.

  Further, in the seventeenth embodiment, a perforated plate with protruding outflow holes is horizontally provided below the plate 233 without providing a perforated plate, and condensate containing non-condensable gas such as oxygen is supplied to the liquid surface 224. Even if the energy at the time of rushing is made to collide and disperse into the perforated plate with the protruding portion outflow hole and then dropped from the protruding portion outflow hole to the condensate reservoir, the same effect as described above can be obtained.

  FIG. 19 is a cross-sectional view showing a schematic configuration of a condenser and the vicinity thereof in an eighteenth embodiment of the present invention.

In the eighteenth embodiment, as shown in FIG. 19, a perforated plate 128 is horizontally provided immediately below the liquid level of the condensate reservoir in the condenser 206. The perforated plate 128 has a plurality of outflow holes 102 provided at appropriate intervals on the plate surface.

According to the eighteenth embodiment having such a configuration, condensate enters from the plate 233 to the liquid surface 224 as condensed water heat exchanger comprising a non-condensable gas such as oxygen generated in the reactor pressure vessel When the energy at the time collides with the perforated plate 128, the accompanying amount of gas from the liquid surface 224 can be reduced. Therefore, the content concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

In the eighteenth embodiment, the energy when the condensate containing a non-condensable gas such as oxygen enters the liquid surface 224 is further provided horizontally in the vicinity of the upper liquid surface of the condensate pool. Can collide with the perforated plate near the upper part of the liquid level and the horizontal perforated plate 128 provided immediately below the liquid level and can be dispersed, and a more remarkable effect can be obtained as compared with the above embodiment.

In the eighteenth embodiment, the porous plate 128 is provided horizontally just below the level of the condensate pool in the condenser 206, but instead, a plurality of ball-shaped bumps 188 near the level of the condensate pool. You may make it float.

  Even in such a configuration, the energy when condensate containing a non-condensable gas such as oxygen enters the liquid surface is dispersed by causing it to collide with a plurality of ball-shaped punches 188 floating on the liquid surface. The amount of gas entrained from can be reduced.

  Here, a ball-shaped protrusion 188 that floats on the liquid surface and a high-density ball-shaped protrusion 189 that sinks below the liquid surface may be provided as a buffer material for the waterfall flow. Furthermore, these ball-shaped bumps may be connected by chain-like ones.

  FIG. 20 is a sectional view showing a schematic configuration of the condenser and the vicinity thereof in the nineteenth embodiment of the present invention.

  In the nineteenth embodiment, as shown in FIG. 20, a receiving container 139 is provided in the condensate falling portion in the condenser 206, and the perforated receiving tray 140 that receives the waterfall flow from the downcomer pipe 141 provided in the lower portion thereof is horizontally disposed. It is intended to be provided.

  According to the nineteenth embodiment having such a configuration, the energy when condensate containing non-condensable gas such as oxygen generated in the reactor pressure vessel enters the liquid surface 224 is provided in the vicinity of the liquid surface. The incidental amount of gas from the liquid surface can be reduced by causing the waterfall flow from the downcomer 141 received at the receiver 139 to collide with the perforated tray 140 and disperse. Therefore, the content concentration of non-condensable gas such as dissolved oxygen in the feed water can be reduced.

  Here, in the above embodiment, even if a hemispherical block is provided in the perforated tray provided below the downcomer and the waterfall flow collides with the spherical surface, the same effect as described above can be obtained.

  FIG. 21 is a perspective view showing a donut-shaped perforated pipe connected to a downcomer pipe having a lower part of a receiving container in a condenser according to a twentieth embodiment of the present invention.

  In the twentieth embodiment, as shown in FIG. 21, a large number of outflows are caused around the downcomer pipe around the downcomer pipe 141 in correspondence with the lower part of the downcomer pipe 141 communicating with a receiving container (not shown) provided in the condenser. A donut-shaped tube 151 having a hole is disposed in a horizontal state, and the donut-shaped tube 151 and the descending tube 141 are connected by a plurality of communication tubes 150.

  Even in such a configuration, the energy when condensate containing non-condensable gas such as oxygen generated in the reactor pressure vessel enters the liquid surface is communicated in the circumferential direction from the downcomer 141 provided near the liquid surface. After flowing into the doughnut-shaped tube 151 through 150, it can be ejected and dispersed as droplets from the outflow hole, so that the amount of gas accompanying the liquid surface can be reduced as described above.

  In the above embodiment, a perforated plate having a slit outflow hole is horizontally attached to the downcomer 141 at the bottom of the receiving container, and after flowing from the slit outflow hole to the perforated plate, it is dispersed as liquid droplets on the liquid surface. However, the same effect as described above can be obtained.

  Moreover, in the said embodiment, you may make it attach the disk-shaped baseplate provided with the streamline-shaped guide blade via the support to the lower part of the downcomer 141 which has the lower part of a receiving container.

  Even in such a configuration, the bottom plate provided with guide vanes from the downcomer provided with energy when condensate containing non-condensable gas such as oxygen generated in the reactor pressure vessel enters the liquid surface. Since the flow to the liquid surface can be dispersed as a droplet flow by the centrifugal force generated by the guide vanes, the accompanying amount of gas from the liquid surface can be reduced as described above.

Sectional drawing which shows schematic structure of the low pressure drain tank provided in a part of circulation loop of the feed water heating system in the 1st Embodiment of this invention, and its peripheral part. Explanatory drawing of the other structural example of the piping introduce | transduced in the low pressure drain tank in the same embodiment. Sectional drawing which shows a part of piping introduce | transduced in the low pressure drain tank in the 2nd Embodiment of this invention. The front view which shows the piping introduce | transduced in the low pressure drain tank in the 3rd Embodiment of this invention. The block diagram which shows a part of piping introduce | transduced into the low pressure drain tank in the 4th Embodiment of this invention. The block diagram which shows a part of piping introduce | transduced into the low pressure drain tank in the 5th Embodiment of this invention. Sectional drawing which shows a part of piping introduce | transduced into the low pressure drain tank in the 6th Embodiment of this invention. The structure explanatory view showing a part of piping introduced into the low-pressure drain tank in a 7th embodiment of the present invention. Configuration explanatory drawing which shows a part of piping introduced into the low pressure drain tank in the 8th Embodiment of this invention. Configuration explanatory drawing which shows a part of piping introduce | transduced into the low pressure drain tank in the 9th Embodiment of this invention. Configuration explanatory drawing which shows the connection part of the low pressure drain tank and the edge part of piping in the 10th Embodiment of this invention. The structure explanatory drawing which shows the connection part of the low pressure drain tank and the edge part of piping in the 11th Embodiment of this invention. The structure explanatory drawing of the low-pressure drain tank and its peripheral equipment in a 12th embodiment of the present invention. Configuration explanatory diagram of a low-pressure drain tank and its peripheral devices in a thirteenth embodiment of the present invention. The structure explanatory drawing which shows a part of vertical piping inserted in the low pressure drain tank in 14th Embodiment of this invention. The structure explanatory drawing which shows a part of vertical piping inserted in the low pressure drain tank in 15th Embodiment of this invention. The structure explanatory drawing which shows a part of vertical piping inserted in the low pressure drain tank in 16th Embodiment of this invention. Sectional drawing which shows schematic structure of the condenser in the 17th Embodiment of this invention, and its vicinity. Sectional drawing which shows schematic structure of the condenser in the 18th Embodiment of this invention, and its vicinity. A sectional view showing a schematic structure of a condenser and its neighborhood in a 19th embodiment of the present invention. The perspective view which shows the doughnut-shaped porous pipe connected to the downcomer pipe which has in the lower part of the receiving container in the condenser in the 20th Embodiment of this invention. The system diagram which shows schematic structure of the circulation loop of the feed water heating system of a boiling water reactor. The figure which shows the outline | summary of a structure of the conventional low pressure drain tank and its peripheral device, and the flow of the condensed water from a feed water heater similarly in a feed water heating system. Similarly, in the feed water heating system, a configuration explanatory view showing an outline of a conventional condenser.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Piping, 2 ... End plug, 3 ... Droplet, 4 ... Outflow hole, 12 ... Outlet hole with throttle at end, 13 ... Outlet hole with intermediate throttle, 14 ... Outlet hole with upstream throttle, 17 ...... turning the injection nozzle, 19 ...... spherical tube, 22 ...... branch tube, 26 ...... baffles, 28 ...... L-type full fin, 29 ...... notch off fin, 30 ...... notch 34, rotating sprinkling perforated blade, 35 ... outer tube, 36 ... outflow hole, 38 ... box perforated plate, 44 ... inner box perforated plate, 45 ... outer box perforated plate, 48 ... ... perforated plate, 49 ...... vertical tube, 55 ...... Orifice office, 60 ...... notch, 61 ...... notch with full fin, 68 ...... spiral off fin, 101 ...... perforated plate, 102 ... ... Outflow hole, 103 ... Droplet, 128 ... Perforated plate, 139 ... Receiving container, 140 ... Perforated tray, 141 ... Downcomer, 150 ... Communication pipe, 15 …… Donut-shaped pipe 201 201 Reactor pressure vessel 202 Reactor core 203 203 Pump 204 Steam main piping 205 Turbine 206 Condenser 207 Low pressure condensate , ... Air extractor, 209 ... Off gas treatment system, 210 ... Exhaust pipe, 211 ... High pressure condensate pump, 212 ... Low pressure drain pump, 213 ... Low pressure drain tank, 214, 215 ... Low pressure feed water heater, 216 ... Off-gas extractor, 217 ... High pressure feed water heater, 218 ... Feed water pipe, 219 ... Steam separator, 220 ... Steam dryer, 221 ... Feed water pump, 222 ... Collision plate, 223 ... donut plate, 224 ... liquid level, 225 ... gas, 230 ... steam inlet pipe, 231 ... cooling water supply system, 232 ... heat transfer pipe , 233 ... plate

Claims (3)

The steam generated in the reactor pressure vessel is supplied to the steam turbine through the main steam system piping, and the steam that has driven this steam turbine is condensed by the condenser, and then this condensed water is heated by the condensate pump. feeding the water supply system through the vessel and deaerator, in a boiling water reactor recirculating the reactor feedwater to the reactor pressure vessel,
The condenser includes a heat transfer pipe into which cold water sent from a cooling water system is guided and a plate disposed below the heat transfer pipe.
Further, a boiling water nuclear reactor is provided with a perforated plate horizontally provided with a plurality of holes on a plate surface receiving condensed water flowing from the plate after heat exchange by the heat transfer tube just below the liquid level of the condensate reservoir. . The steam generated in the reactor pressure vessel is supplied to the steam turbine through the main steam system piping, and the steam that has driven this steam turbine is condensed by the condenser, and then this condensed water is heated by the condensate pump. feeding the water supply system through the vessel and deaerator, in a boiling water reactor recirculating the reactor feedwater to the reactor pressure vessel,
The condenser includes a heat transfer pipe into which cold water sent from a cooling water system is guided and a plate disposed below the heat transfer pipe.
A boiling water reactor is provided with a receiving container in a falling portion of the condensate flowing down from the plate and a perforated receiving tray for receiving a waterfall flow from a downcomer pipe provided in the lower portion thereof. The steam generated in the reactor pressure vessel is supplied to the steam turbine through the main steam system piping, and the steam that has driven this steam turbine is condensed by the condenser, and then this condensed water is heated by the condensate pump. feeding the water supply system through the vessel and deaerator, in a boiling water reactor recirculating the reactor feedwater to the reactor pressure vessel,
The condenser includes a heat transfer pipe into which cold water sent from a cooling water system is guided and a plate disposed below the heat transfer pipe.
In addition, a receiving container is provided in the condensate falling part flowing down from the plate, and a donut-shaped pipe having a number of outflow holes on the peripheral surface is formed horizontally around the downcomer pipe corresponding to the lower part of the downcomer pipe provided in the lower part thereof. A boiling water reactor characterized in that the donut-shaped pipe and the downcomer pipe are connected by a plurality of communication pipes.

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