JP4408398B2 - Turbine building of nuclear power plant - Google Patents

Description

  The present invention relates to a technology for arranging equipment in a turbine building of a nuclear power plant that employs a boiling water reactor.

  A nuclear power plant employing a boiling water reactor has a plurality of buildings such as a reactor building and a turbine building. The reactor building has a reactor pressure vessel containing a core loaded with nuclear fuel, and in the reactor pressure vessel, light water is heated in the reactor core to obtain steam when boiled. The steam is led into the turbine building through steam piping.

  In one turbine building, a turbine / generator installation stand is installed in the center, and a turbine building operation floor (hereinafter simply referred to as an operation floor) that divides the turbine building up and down at the same height as the upper end of the stand. ) Is installed. The turbine / generator installation stand includes a high-pressure turbine, three low-pressure turbines, and a generator, which are connected in series with a rotating shaft so that each turbine can rotate and drive the generator to generate power. Has been.

  Steam for driving the turbine is supplied from the reactor building side to the high-pressure turbine through the steam pipe, and the high-pressure turbine is driven by the steam. The steam used to drive the turbine in the high-pressure turbine is in a low-temperature and high-humidity state when discharged from the high-pressure turbine. Therefore, the steam is separated by a moisture separator and heater to improve thermal efficiency and prevent erosion. Dehumidify and heat to high temperature dry steam. The dry steam is supplied from the moisture separation heater to each low-pressure turbine through a pipe, and each low-pressure turbine is driven by the dry steam. When the high-pressure turbine and the three low-pressure turbines are driven in this way, the generator is also driven in synchronism with the driving force to generate a power generation action.

  The steam used for driving the turbine in each low-pressure turbine is discharged from each low-pressure turbine and sent to the low-pressure feed water heater, where the feed water to the reactor pressure vessel is heated with the steam and the high-pressure feed water heater is used. It is possible to supply water to the reactor pressure vessel via This low-pressure feed water heater has four in four stages for each low-pressure turbine (one per stage), and a total of 12 in three low-pressure turbines, which are provided directly under each low-pressure turbine. It is installed in the upper trunk.

  Steam that has exchanged heat with the feed water in each of the four stages of low-pressure feed water heaters is introduced into a condenser that is disposed directly below the upper trunk of the condenser, condensed, and supplied to the reactor pressure vessel.

  Conventional Example 1: Among each device in such a turbine building, the moisture separation heater integrates the moisture separation means and the heating means to improve the thermal efficiency, reduce the amount of piping, and improve the space efficiency. (For example, refer to Patent Document 1). Two such moisture separation heaters are employed, and are arranged on both sides of the low-pressure turbine on the operation floor so that the length direction is parallel to the turbine shaft (for example, non-patent document). 1 and 2). If a moisture separator / heater is placed on both sides of the low-pressure turbine, the arrangement tends to be symmetrical with the moisture separator / heater and the piping route related to the low-pressure turbine. An efficient and efficient system can be built in the balance of the steam flow rate entering the vessel.

  Below the operation floor, a space for pulling out the heat transfer tube of each low-pressure feed water heater is set on one side of the upper body of the condenser, that is, a feed water heater tube pull-out space is set, and moisture is separated into that space. The moisture separator heater is arranged above the operation floor so that the heater does not interfere.

  Conventional example 2: Contrary to this, it is also considered that a moisture separation heater is disposed below the operation floor at the height of the condenser upper body and close to the high-pressure turbine (for example, Non-Patent Document 3 and Patent Document 1).

  Conventional example 3: In addition, as a variation of disposing a moisture separation heater below the operation floor, one of the two moisture separation heaters installed in the plane direction of the turbine / generator axial direction from the other one A method of shifting the generator to the generator side is described. This is because the moisture separator heater installed on the tube extraction side of the condenser built-in water heater is the same as the conventional arrangement under the operation floor. In order to avoid this, the moisture separator / heater is arranged in the area under the high-pressure turbine, and the tip of the moisture separator / heater is installed at a position where it does not intersect with the feed water heater tube drawing space. The tube pull-out space of the low-pressure feed water heater built in the upper body of the condenser is shared with the tube pull-out space of the moisture separation heater, but the tube pull-out space of the moisture separation heater on the opposite side is the building. Must be partly overhanging. In addition, a method has been proposed in which the moisture separation heater installed on the opposite side of the condenser water supply heater tube extraction space is shifted to the generator side to secure the moisture separation heater tube extraction space in the building. (For example, refer to Patent Document 2).

  Conventional example 4: In addition, a moisture separator / heater installed in the turbine building of a nuclear power plant is separated into a moisture separator and a heater, and the moisture separator is installed independently from the high-pressure turbine. Since the heater installed and separated in the middle of the exhaust pipe connected to the pipe is thinner and smaller than the diameter of the conventional moisture separator heater, the condenser under the operation floor in the direction parallel to the turbine / generator axis An arrangement method has been proposed that can be accommodated in both areas and in the upper area of the condenser built-in feed water heater tube drawing space (see, for example, Patent Document 3).

  Conventional example 5: In addition, the steam piping connecting the moisture separator and the low-pressure turbine installed in the turbine building is installed on the beam of the turbine / generator support frame so that the operation floors on both sides of the low-pressure turbine are installed. An arrangement method for flattening is proposed (see, for example, Patent Document 4).

JP-A 61-266777 JP-A-11-23771 Japanese Patent Laid-Open No. 2003-14485 JP-A-3-3903 "Summary of light water reactor power plant" Nuclear Safety Research Association Practical Text Editorial Committee Page 23 “Kashiwazaki-Kariwa Nuclear Power Station Reactor Installation Permission Change Application Form (Expansion of Reactor Nos. 6, 7) and attached documents” page 57 “Shiga Nuclear Power Station Reactor Installation Permission Change Application Form (Addition of Reactor No. 2) Text and Attached Documents” on page 51 and page 58

  In the case where the moisture separation heater is disposed on the operation floor of the turbine building as in Conventional Example 1 above, the steam generated in the reactor pressure vessel is passed through the moisture separation heater, In order to protect the workers on the operating floor from radiation, it is necessary to provide radiation shielding means around the moisture separator heater. This radiation shielding means is a box-shaped structure configured by attaching a radiation shielding ceiling to a radiation shielding wall installed on the operation floor, that is, a moisture separation heater room. Making such a moisture separation heater room on the operation floor extends the construction process and temporarily puts parts for the turbine and generator overhaul, that is, the turbine / generator disassembly temporary storage area (laydown area). ) Cannot be widely obtained on the driving floor. In particular, it is difficult to secure an area for laying down large parts. Therefore, in order to secure a laydown area, it is necessary to increase the area of the turbine building or to carry a disassembled product to an adjacent building. Increasing the turbine building area increases the power plant construction process.

  In Conventional Example 2, since the moisture separator / heater is arranged under the operation floor of the turbine building, the operation floor performs a radiation shielding function, and a moisture separation heater room for shielding radiation is required on the operation floor. In addition, it has the advantage that a wide laydown area can be secured on the driving floor. However, the plane arrangement of the moisture separator heater under the operation floor is arranged on the side of the building from the high pressure turbine so that it does not cross the feed water heater tube drawing space of the low pressure feed water heater. The length in the longitudinal direction of the turbine shaft increases and the size increases. Increasing the size of the building is a factor in extending the construction process of the power plant. In addition, since a valve is disposed in the pipe between the moisture separation heater and the low-pressure turbine, there is a problem that a shielding plate that covers the valve protrudes upward from the operation floor and narrows the laydown area.

  Since Conventional Example 3 does not intersect with the feed water heater tube extraction space of the low pressure feed water heater, only the moisture separation heater on one side that easily intersects with that space is brought close to the end of the turbine building, The shape of the turbine building tends to be complicated and large. Increasing the shape and size of the building will be a factor in extending the construction process of the power plant.

  Conventional Example 4 separates the moisture separator / heater into a moisture separator and a heater, divides the moisture separator / heater into a moisture separator and a heater, reduces the size, and narrows the body diameter of the heater. This is to arrange a heater between the upper operation floor and the condenser built-in feed water heater tube drawing space. This suggests an arrangement method in which the equipment is divided into small equipment and stored in a narrow space. The conventional moisture separation heater is a large equipment and has a large body diameter. It has been difficult to apply this conventional example as a measure for storing in a space between the water heater built-in water heater tube pull-out space. Even when the heater is arranged under the operation floor, the space on both sides of the low-pressure turbine on the operation floor cannot be completely flattened because the combination intermediate valve and the enclosure or steel plate on the radiation shield surrounding it are arranged. This is a factor that hinders the decomposition laydown of large equipment.

  Conventional example 5 is for passing a steam pipe from a moisture separator heater arranged under the operation floor of the turbine building to a low pressure turbine steam inlet nozzle to a beam on the operation floor surface of the turbine / generator installation stand. The operation floor is flattened by providing a through-hole and piping through this through-hole, but it was necessary to increase the beam dimensions, the amount of steel frames and reinforcing bars to ensure the strength of the beam by installing the through-hole. The strength of the beam is governed by the height of the beam, but in addition to the structural feasibility by reinforcing the cross-sectional defect close to about 1/3 to 1/4 of the beam height, the workability of reinforcement and steel plate Verification that takes into account is necessary. Conventionally, the steam inlet nozzle of the low-pressure turbine has been installed mirror-symmetrically in the horizontal and lateral direction. However, in the present invention, the steam inlet nozzle is connected from the lower side of the turbine and the two steam inlet nozzles are arranged close to each other. Therefore, it is necessary to take measures for evenly distributing the steam that has entered the low-pressure turbine as compared with the conventional nozzle position.

  An object of the present invention is to achieve downsizing of a building of a nuclear power plant while adopting a moisture separator / heater in which a moisture separator and a heater are integrated in order to improve thermal efficiency and the like.

Means for achieving the object of the present invention has the following requirements.

That is, a turbine building of a nuclear power plant, an operation floor that vertically partitions the turbine building, a turbine / generator installation stand installed in the turbine building, and a turbine / generator installation stand A high-pressure turbine, a plurality of low-pressure turbines, a generator installed on the turbine / generator installation base and driven by each turbine, and steam received from the low-pressure feed water heater installed below the low-pressure turbine. A condenser that condenses as feed water to the reactor pressure vessel, a condenser upper trunk disposed between the condenser and each low-pressure turbine, and is installed in the condenser upper trunk, A plurality of low-pressure feed water heaters that receive steam from each low-pressure turbine and heat the feed water in a plurality of stages, and the operation floor located above the tube drawing space of the low-pressure feed water heater When the sides of the turbine generator installation stand a lower side of the operation floor opposite the tube withdrawal space, disposed respectively across said low pressure turbine, supplied from the high pressure turbine to the low pressure turbine It is required to be a turbine building of a nuclear power plant provided with a plurality of moisture separation heaters for dehumidifying and heating steam.

Moreover, the following effects are produced by providing such means.

That is, only the moisture separator or moisture separation heater on the side of the pull-out space of the condenser built- in condenser on the operation floor is placed on the operation floor, so that two conventional moisture separators or moisture separation heaters are installed on the operation floor. Compared with the case where it arrange | positions, it can suppress that the turbine / generator decomposition | disassembly laydown space ensuring at the time of the periodic inspection of an operation floor is inhibited. As a result, compared to the case where two moisture separators or moisture separator heaters are arranged on the operation floor, it is possible to expand the building for securing the insufficient laydown space or to reduce the adjacent building used as the laydown space. .

  According to the present invention, a turbine / generator disassembled product temporary storage area (laydown area) can be secured as much as possible while employing a moisture separator / heater, so that the turbine building can be made compact.

When the inventor devised an embodiment of the present invention, the inventor simultaneously invented the following reference embodiments.

(Reference Example 1)
A nuclear power plant employing a boiling water reactor has a plurality of buildings such as a reactor building and a turbine building 1. The reactor building has a reactor pressure vessel containing a core loaded with nuclear fuel, and in the reactor pressure vessel, light water is heated in the reactor core to obtain steam when boiled. The steam is guided into the turbine building 1 through the main steam pipe 21.

  In one turbine building 1, a turbine / generator installation stand 9 is installed in the center, and the turbine building operation is divided into upper and lower sections at the same height as the upper end of the turbine / generator installation stand 9. A floor (hereinafter simply referred to as a driving floor) 13 is installed. The turbine / generator installation base 9 includes a high-pressure turbine 6 and three low-pressure turbines 7a, 7b, and 7c (hereinafter, the three low-pressure turbines 7a, 7b, and 7c are collectively referred to as low-pressure turbine 7). And a generator 8, which are connected to a rotating shaft in series, and each turbine is configured to drive the generator 8 to rotate to generate power. 14 is an overhead crane installed in the turbine building, which is used as a crane when disassembling each turbine or generator 8 and temporarily placing it on the operation floor 13 or reassembling.

  Steam for driving the turbine is supplied to the high-pressure turbine 6 from the reactor building side through the main steam pipe 21, and the high-pressure turbine 6 is driven by the steam. The steam supplied to the high-pressure turbine 6 is used to drive the turbine, and is later discharged from the high-pressure turbine 6. The discharged steam is in a low temperature and high humidity state, so that the heat efficiency is improved. In order to prevent erosion, the vapor is indicated as two moisture separation heaters 2a and 2b (hereinafter, the two moisture separation heaters 2a and 2b are collectively referred to as moisture separation heater 2). ) To dehumidify and heat to a high temperature dry steam. The dry steam is supplied from the moisture separator and heater to each low-pressure turbine 7 through the main steam pipe 21, and each low-pressure turbine 7 is driven by the dry steam. When the high-pressure turbine 6 and the three low-pressure turbines 7 are driven in this way, the generator 8 is also driven in synchronism by the driving force to generate a power generation action.

  Steam used for driving the turbine in each low-pressure turbine 7 is discharged from each low-pressure turbine 7 to be supplied to the fourth stage low pressure feed water heaters 10-4a, 10-4b, 10-4c, and the third stage low pressure feed water heating. 10-3a, 10-3b, 10-3c, second stage low pressure feed water heaters 10-2a, 10-2b, 10-2c, first stage low pressure feed water heaters 10-1a, 10-1b, 10-1c (Hereinafter, when the low-pressure feed water heaters are collectively referred to as the low-pressure feed water heater 10), the feed water to the reactor pressure vessel is heated with the steam, and the high-pressure feed water heater is It is possible to supply water to the reactor pressure vessel via. This low-pressure feed water heater 10 is provided with four in four stages (one per stage) for each low-pressure turbine, and a total of twelve in three low-pressure turbines 7 immediately below each low-pressure turbine 7. It is installed in each condenser upper body 5a, 5b, 5c (hereinafter, when each condenser upper body 5a, 5b, 5c is generically referred to as the condenser upper body 5).

  The steam exchanged with the feed water in each of the four stages of the low pressure feed water heaters 10 is converted into the condensers 4a, 4b, 4c (hereinafter referred to as the respective condensers 4a, 4b, In the case of generically referring to 4c, it is indicated as the condenser 4.) It is introduced into the condenser, condensed, and supplied to the reactor pressure vessel.

  FIG. 1 shows an example of the system configuration of the turbine equipment in the turbine building 1 and the main devices attached thereto, assuming a 1350 MWe class boiling water nuclear power plant. That is, as shown in FIG. 1, steam generated by the reactor pressure vessel is guided to the turbine building 1 through the four main steam pipes 21, passes through the main steam stop valve / regulator valve 43, and is sent to the high pressure turbine 6. It is done. The steam discharged from the high-pressure turbine 6 is driven to rotate the high-pressure turbine so that the temperature is slightly reduced and the moisture is increased. This steam is sent from the moisture separator heater steam inlet nozzle 36 into the two moisture separator heaters 2a and 2b through the main steam pipe 21, and the moisture separator installed in the moisture separator heaters 2a and 2b. Moisture is removed by a vessel, and further heated by a heater installed in the moisture separation heaters 2a and 2b (heated in two stages in the case of the 1350 MWe class), and steam with low wetness is moisture separated and heated. The steam is supplied from the steam outlet nozzle 35 to the three low-pressure turbines 7a, 7b, 7c through the main steam pipe 21 as dry steam. At this time, two steam pipes 21 are routed from the high-pressure turbine 6 to one moisture separator / heater 2 and branched and connected to four before the steam inlet nozzle 36.

  The main steam pipe 21 is connected to the low-pressure turbines 7 a, 7 b, and 7 c through the combined intermediate valve 17 from the three outlet nozzles 35 above the moisture separator / heater 2. The dry steam that has entered the low-pressure turbines 7a, 7b, and 7c from the main steam pipe 21 is driven from the low-pressure turbines 7a, 7b, and 7c and then discharged from the low-pressure turbines 7a, 7b, and 7c. The water is condensed by the condensers 4a, 4b, 4c installed in the water and becomes water, and the water is supplied to the reactor pressure vessel.

  Further, this water is returned to the reactor pressure vessel through the water supply pipe 45 through the following equipment. Water discharged from the three condensers 4a, 4b, and 4c is pressurized by the low-pressure condensate pump 26, and then passes through the condensate filtration device 18 and the condensate demineralizer 25 to provide sufficient water quality as reactor water supply. Then, the pressure is increased by the high pressure condensate pump 37 through the air extractor 41 and the ground steam condenser 42. Thereafter, the fourth stage low-pressure feed water heaters 10-4a, 10-4b, 10-4c, the third stage low-pressure feed water heaters 10-3a, 10-3b, 10-3c, second installed in the condenser upper shell. The feed water temperature is raised by the first stage low pressure feed water heaters 10-2a, 10-2b, 10-2c and the first stage low pressure feed water heaters 10-1a, 10-1b, 10-1c, and the pressure is raised by the reactor feed water pump 39. The two-stage high-pressure feed water heaters 38-2a and 38-2b and the first-stage high-pressure feed water heaters 38-1a and 38-1b are further raised in feed water temperature and sent to the reactor. Since the first to fourth stage low-pressure feed water heaters are separated and arranged in three series according to the number of the condensers 4a, 4b, 4c and are installed in each condenser upper trunk 5, three series × 4-stage configuration = a system configuration having 12 low-pressure feed water heaters. In that case, four low pressure feed water heaters are installed in one condenser upper trunk. The high-temperature steam extracted from each low-pressure turbine 7a, 7b, 7c is led to each of the first to fourth low-pressure feed water heaters 10 by the extraction pipe 40 to exchange heat with the water in the feed water pipe. The temperature of the feed water returning to the pressure vessel side is raised. The nozzles installed in the lower part of the low-pressure turbine and the low-pressure feed water heaters 10 installed in each stage of the condenser upper body are connected by this extraction pipe 40, and the extracted steam is heat-exchanged in the low-pressure feed water heater 10. Thus, the system configuration is such that the temperature is lowered to become drain water, and is returned from each low-pressure feed water heater 10 to the condenser 4 through the drain pipe 44.

  FIG. 2 shows a schematic structure in the moisture separation heater 2. The moisture separator / heater 2 has a cylindrical body 47 on the outside and an end plate 48 at the end, and has a shape elongated in the horizontal direction. Since the moisture separator 49, the first stage heater 50, and the second stage heater 51 are provided in the body 47 of the moisture separator heater 2, in the case of a nuclear power plant with an output of 1350 MWe, the diameter Is a large equipment with a length of over 4m and a length of over 30m. Steam inlet nozzles 36a, 36b, 36c, and 36d (hereinafter referred to as steam inlet nozzle 36 when generically referred to as steam inlet nozzles 36a, 36b, 36c, and 36d) are installed at the bottom of the body 47, and a high-pressure turbine. The main steam pipe 21 from 6 is connected. Further, the main steam outlet nozzles 35a, 35b, 35c, and 35d for supplying steam to the low-pressure turbine 7 are disposed above the body 47 (hereinafter, the main steam outlet nozzles 35a, 35b, 35c, and 35d are collectively referred to as main steam outlet nozzles). 35.) is installed.

  The moisture separator 49 is installed on the lower side of the body 47. The role of the steam discharged from the high-pressure turbine 6 is to reduce the temperature and increase the moisture by rotating the high-pressure turbine. Therefore, by separating the steam and water by passing through the corrugated moisture separators 49a, 49b, and reducing the wetness of the steam sent to each low-pressure turbine 7 by making it almost dry steam, It aims to improve plant performance and reduce member erosion to low-pressure turbines.

  In the body 47, first stage heaters 50a, 50b are installed above the moisture separators 49a, 49b, and second stage heaters 51a, 51b are installed in the upper and lower areas respectively. This role is intended to improve the thermal efficiency of the turbine system and increase the power generation output by further heating the steam from the moisture separators 49a and 49b to increase the steam temperature. In addition, as the heat source for heating, the extraction steam 52 taken out from the part before the last stage of the high-pressure turbine 6 is used, and the extraction steam 52 is supplied to the first stage heater 50a, 50b is connected to the pipe, and a part of the high-temperature main steam on the front side (upstream side) of the main steam stop valve / regulator valve 43 at the time of entering the turbine building 1 from the reactor pressure vessel side is taken out. The extracted steam 53 is connected by piping so that the extracted steam 53 enters the second stage heaters 51 a and 51 b from the nozzles installed on the end plate 48. The high-temperature steam dried in the moisture separator / heater 2 is supplied to each low-pressure turbine 7 from a steam outlet nozzle 35 installed at the top. Further, the moisture separated from the steam by the moisture separators 49 a and 49 b and the steam in the heater are drained and collected in the respective drain tanks from the drain nozzle 54 installed at the lower part of the body 47.

  Such a moisture separation heater 2 and low-pressure feed water heater 10 are arranged in the turbine building 1 as shown in FIGS. 3, 4, 5, and 6. That is, FIG. 3 is an arrangement plan view of the lower surface of the operation floor 13 of the turbine building 1 showing the arrangement of the main equipment in the turbine building according to the present embodiment. As shown in FIGS. 3, 4, 5, and 6, four low-pressure feed water heaters 10 are housed in the condenser upper shell 5 of the turbine building 1. FIG. 4 is an arrangement plan view of equipment on the upper surface of the operation floor 13, FIG. 5 is a longitudinal sectional view in the short side direction thereof, and FIG. 6 is a longitudinal sectional view on the feed water heater tube drawing space 11 side in the long side direction. is there.

  The large moisture separator / heater 2 is disposed on both sides of the condenser upper trunk 5 at the lower part of the operation floor 13 of the turbine building 1, and four feed water heaters 10 per cylinder are incorporated in the condenser upper trunk 5. The arrangement in this case will be described. As shown in FIGS. 3, 5, and 6, a total of four water heaters 10 in two upper and lower stages are arranged in two horizontal rows per cylinder in the condenser upper body 5. Further, each of the low-pressure feed water heaters 10 is provided with a feed water heater tube drawing space 11 below the operation floor 13.

  In order to arrange the large moisture separation heater 2 in the area of the feed water heater tube drawing space 11 in the area under the operation floor 13 and on both sides of the condenser upper trunk 5, the feed water heater tube drawing space 11 is provided. The moisture separation heater 2 is installed above the feed water heater tube drawing space 11 so as to avoid interference with the moisture separation heater 2 main body. At this time, it is necessary to change and arrange the floor level of the operation floor 13 so as to avoid interference between the operation floor 13 and the moisture separation heater 2. Therefore, in order to secure a space for arranging the moisture separation heater 2 and the main steam pipes 21 installed above and below it, the operation floor 13 corresponding to the upper part of the installation area of the moisture separation heater 2 is turbine / power generation. It is raised and installed at a position higher than the upper surface (upper floor surface) of the machine installation stand 9. The raised operation floor 13 and the non-raised operation floor 13 are constructed so as to be continuous.

  In the conventional arrangement, the operating position of the turbine building 1 is set to the same floor level as the upper floor of the turbine / generator installation stand 9 (reference floor as the operation floor 13) as the reference floor as the installation position of the moisture separation heater 2. Set the level of 13 and arrange the moisture separation heater 2 at the top or move the moisture separation heater to the high pressure turbine side so as not to interfere with the feed water heater drawing space and place it at the bottom of the operation floor 13 In this embodiment, the height of the operation floor 13 installed on both sides of the low-pressure turbine 7 is changed to be higher than the operation floor 13, and the casing 34 is raised from the upper floor surface of the turbine / generator installation base 9. The operation floor of the constructed turbine building is to secure a space for storing the moisture separation heater 2 in the upper part of the feed water heater tube drawing space 11.

  In this embodiment, the end plate 48 of the moisture separator / heater 2 is removed from the body 47, and the heaters 50a, 50b, 51a, 51b are pulled out of the body 47 for maintenance inspection or replacement. Space, that is, a heater extraction space 3 with a built-in moisture separator / heater can be secured without imposing an increase in the length of the turbine building. Reference numeral 22 denotes a detachable wall of the turbine building, which is a wall that can be removed and reassembled when a large-sized device is carried in and out of the turbine building.

  Further, in order to avoid interference between the feed water heater tube drawing space 11 and the main steam pipe 21 in the route of the main steam pipe 21 from the high pressure turbine 6 to the moisture separation heater 2 on the feed water heater tube drawing space 11 side, it will be described later. The piping route is the same as in Example 2.

  In addition, even when the moisture separator / heater 2 is disposed under the operation floor 13, low-pressure turbine steam inlet nozzles 30 are installed on both sides of the low-pressure turbine 7 on the surface of the operation floor 13, and the moisture separation heating is performed on these nozzles. A discharge pipe 32 from a steam outlet nozzle 35 installed in the upper part of the vessel 2 is connected, and a combined intermediate valve 17 is installed in the low-pressure turbine steam inlet nozzle 30. This combination intermediate valve 17 is a valve that is disposed in the vicinity of the steam inlet nozzle 30 of the low-pressure turbine 7 to adjust and close the steam flow rate.

  In addition to securing these valves and piping space, the area where the combined intermediate valve 17 is installed is based on shielding requirements for the area around the low pressure turbine 7 and the high pressure turbine 6 (turbine / generator laydown area 29) on the operation floor 13. A room 31 for a combination intermediate valve made of a box-shaped concrete casing or an iron plate for shielding surrounding the valve / pipe area is installed on the operation floor. Therefore, in the areas on both sides of the low-pressure turbine 7, a level difference is generated in a form in which two casings or shielding iron plates for shielding are projected upward from the surface of the operation floor 13.

  For this reason, even when the moisture separator / heater 2 is disposed below the operation floor 13, the space on both sides of the low-pressure turbine 7 on the operation floor 13 cannot be flattened, which is a factor that hinders the decomposition laydown of large equipment. There were restrictions such as use as a laydown space for small items.

Skeleton 34 in this reference real施例that raising the moisture operation floor of the installation area top of separator heater 2 below the operation floor 13 is the low pressure turbine steam inlet nozzle 30 combined intermediate valve 17 and moisture separator reheater steam outlet The main steam pipe 21 between the nozzles 35 is horizontally arranged, and the floor of the enclosure surrounding the combined intermediate valve 17 and the main steam pipe 32 is operated at a height equal to or higher than the step for installing the combined intermediate valve. By raising the floor surface, the areas on both sides of the low-pressure turbine 7 can be completely flattened. In addition, since the operation floor 13 in the raised area has a level difference of about 3 to 4 m from the surrounding operation floor 13 which has not been raised, the installation of the step 20 for access between the operation floors and the combination intermediate valve By placing the carry-in / out hatch 33 on the raised floor, it is arranged in consideration of the accessibility to the raised area and the maintainability by loading / unloading the equipment from the hatch. As a result, the area on both sides of the flattened low-pressure turbine 7 can be used as a large equipment disassembly laydown space at the time of regular inspection, thereby securing a wider laydown space than the conventional arrangement under the operating floor of the moisture separation heater. Therefore, it is possible to abolish the adjacent building for securing the laydown space or suppress the increase in the plane size of the turbine building. Also, as described above, the main steam pipe 21 connected to the moisture separation heater 2 and the combined intermediate valve 17 and the low-pressure turbine steam inlet nozzle 30 are installed at the same level, so that a route with less bending can be provided. The amount of goods can also be reduced.

While the low-pressure feed water heater 10 of four per cylinder in the present reference real施例shown the arrangement of a case with a built-in condenser upper cylinder 5, as a modification of the first embodiment, then two per cylinder The arrangement when the low-temperature feed water heater is built in the condenser upper shell will be described. FIG. 7 is an arrangement plan view under the operation floor 13 when two water heaters are accommodated in the condenser upper body 5 and FIG. 8 is a longitudinal sectional view in the short side direction.

  As will be described later, the first and second stage low-pressure feed water heaters are transferred to the condenser upper body 5 to the outside of the condenser upper body 5 and integrated into one for each stage. The arrangement of the low-pressure feed water heater 12 after the integration of the two low-pressure feed water heaters 12-1 and 12-2 is changed to the two system configurations of the first-stage low-pressure feed water heater 12-1 and the second-stage low pressure feed water heater 12-2. It is installed in the area on the outer wall side along the long side of the turbine building, which has been secured as a space where equipment, piping, etc. are not installed as the vessel tube carry-in / out space. In the upper condenser body 5, third and fourth low-pressure feed water heaters 10 are arranged in a horizontal two-row arrangement in the upper and lower stages as usual.

Also, similar to the moisture installation height of the separator heater 2 has a built-in low-pressure feed water heater 10 of four per cylinder to the condenser upper cylinder 5 Reference real Example 1, the moisture separator heater 2 The operation floor 13 is raised only in the installation area, and a connecting piping space between the main steam inlet nozzle 30 of the low-pressure turbine 7, the combination intermediate valve 17 and the main steam outlet nozzle 35 of the moisture separation heater 2 is formed below the operation floor 13. Set in consideration. Since there are two low-pressure feed water heaters 10 built in the condenser upper shell 5, the space above the feed water heater tube pull-out space 11 and the lower surface of the body 47 of the moisture separation heater 2 compared to the built-in four. Therefore, the main steam pipe 21 connected to the main steam inlet nozzle 36 of the moisture separation heater 2 can also be arranged above the feed water heater tube drawing space 11. By arranging in this way, the main steam pipe 21 from the high-pressure turbine 6 to the main steam inlet nozzle 36 of the moisture separation heater is compared with the case where four condenser water heaters are built in the condenser upper shell 5. It is possible to arrange the route without restricting the route, and it is possible to make the route symmetric with the main steam pipe routing route on the opposite side of the feed water heater tube drawing space 11, and with a simple route with little bending. The arrangement can reduce the amount of pipes.

(Reference real施例2)
FIG. 9 is an arrangement plan view of the lower surface of the operation floor 13 of the turbine building 1 according to the present invention, and is an embodiment in the case where the low-pressure feed water heater is not built in the condenser upper body 5. FIG. 10 is a longitudinal sectional view in the short side direction, and FIG. 11 is a longitudinal sectional view in the long side direction.

  The moisture separator / heater 2, which is a long and large-sized device, is installed in an area of the condenser room under the operation floor 13, and is arranged on both sides of the condenser upper body 5 in parallel with the turbine / generator axial direction.

  At this time, in order to avoid interference between the feed water heater tube pull-out space 11 of the low pressure feed water heater 10 and the moisture separation heater 2 which have been installed in the upper condenser body 5 of the conventional condenser, The configuration with a built-in low-pressure feed water heater was abolished. These low-pressure feed water heaters are integrated, and an integrated low-pressure feed water heater 12 with a reduced number of bases is disposed under the operation floor 13. In the case of a turbine building of a 1350 MWe class nuclear power plant, usually four feed water heaters 10 are built in the upper fuselage 5 of the condenser, and there are 4 per barrel in the condenser. X3 body = total 12 water heaters 10 are installed.

All low-pressure feed water heater 10 to be transferred disposed outside 5 condenser upper barrel to avoid interference between the main body and the feed water heater tube withdrawal space 11 of the moisture separator heater 2 in this reference real施例. In this case, securing a new space in the turbine building 1 for arranging the 12 low-pressure feed water heaters 10 may lead to an increase in building dimensions and increase costs. For this reason, the number is reduced by adopting a system facility configuration in which twelve low-pressure feed water heaters are integrated for each series.

FIG. 12 shows the system configuration when integrating the fourth stage low-pressure feed water heater 10 from the first stage was based the system of reference the actual Example 1. In FIG. 12, since the system configuration around the high-pressure turbine 6 and the moisture separator / heater 2 is the same as that in FIG. 1, it is omitted. All the low-pressure feed heaters 10 installed in the condenser upper shell 5 are moved outside the condenser, and one stage of the low-pressure feed heaters installed separately for each condenser 4a, 4b, 4c. By integrating them into one, a total of 12 low-pressure feed water heaters are reduced to 4/4 stages.

  Specifically, the first-stage low-pressure feed water heaters 10-1a, 10-1b, 10-1c of the first embodiment are integrated into one to form a first-stage low-pressure feed water heater 12-1, and sequentially in the same manner. The system configuration is the second-stage low-pressure feed water heater 12-2, the third-stage low-pressure feed water heater 12-3, and the fourth-stage low-pressure feed water heater 12-4. Further, by installing a low-pressure feed water heater outside the upper condenser body 5, the extraction pipe 40 from the low-pressure turbines 7 a, 7 b, 7 c is integrated into one / stage low-pressure from each low-pressure turbine 7 a, 7 b, 7 c. Although it is possible to connect to the feed water heater 12 respectively, in order to reduce the amount of pipes, the extraction pipes 40 coming out from the low-pressure turbines 7a, 7b, 7c are integrated in the condenser or outside the condensers. Connect to low pressure feed water heater 12. The drain pipe 44 is integrated from the integrated first-stage low-pressure feed water heater 12-1 to the second-stage low-pressure feed water heater 12-2, the third-stage low-pressure feed water heater 12-3, and the fourth-stage low-pressure feed water heater 12. -4, the drain from the fourth stage low-pressure feed water heater is returned to the condensers 4a, 4b, 4c through the drain pipe 44.

Next, a method for securing the installation space for the four integrated low-pressure feed water heaters 12 will be described below . For conveying the feed water heater tube body which is withdrawn from the low pressure feed water heater 10 built in the condenser upper torso as reference the actual Example 1 outdoors, the turbine building 1 in the long side direction condenser chamber A removable wall 22 is installed on the outer wall. In the turbine building up to the detachable wall 22, a space space is secured for carrying out the extracted water heater tube body outdoors. Further, considering the replacement of the feed water heater tube of the low pressure feed water heater carried out outdoors with a new one, there is a space 46 for carrying a new feed water heater tube into the condenser upper body 5 from the outside. Therefore, the area from the low pressure feed water heater installation area to the outer wall of the condenser upper trunk 5 is a space space where no equipment, piping, etc. are installed as a tube carry-in / out space. 9 to 11 show an embodiment in which four integrated low-pressure feed water heaters 12 are arranged outside the condenser upper body 5. A moisture separator / heater 2 is disposed on both sides of the condenser upper shell 5, and no low-pressure feed water heater is installed on the condenser upper shell 5. A low-pressure feed water heater 12 integrated in the vicinity of 22 is installed. Since the extraction pipe from the low-pressure turbine 7 is connected to the integrated low-pressure feed water heater 12, it is preferable to arrange it near the condenser so as not to extend the pipe length as much as possible. A moisture separator / heater 2 is disposed in the area, and a low-pressure feed water heater 12 integrated in a space outside (outside the wall) is installed. In the conventional arrangement, this space is ensured as a space where equipment, piping and the like are not installed as the low-pressure feed water heater tube carry-in / out space space 46.

Moreover, when the low-pressure feed water heater 12 is arranged in this area, the size of the low-pressure feed water heater 12 is slightly increased by integrating the low-pressure feed water heater, but the arrangement space is made more efficient. Therefore, the feed water heater tube drawing space 11 of the four integrated low pressure feed water heaters 12 is shared by arranging two low pressure feed water heaters 12 in series. Note that installing the integrated low-pressure feed water heater 12 outside the upper condenser body 5 slightly increases the length of the extraction pipe from the low-pressure turbine 7. However, as shown in FIG. not pose a significant amount increases when viewed by performing integration from the entire pipe amount in the turbine building, a total of 12 low-pressure feed water heater 10 in the reverse reference actual Example 1 integrates low-pressure feed water heater Reducing the number of 12 to 4 (from 12 to 4) also reduces the number of equipment, so a cost reduction effect can be expected. By implementing these measures, an installation space for these integrated low-pressure feed water heaters 12 can be secured without affecting the turbine building dimensions.

  Thereby, even if the moisture separator / heater 2 is arranged on both sides of the condenser upper trunk 5 under the turbine / generator installation floor, that is, the operation floor 13, the low-pressure feed water heater 12 and the feed water heater tube drawing space 11 are provided. There will be no interference. Further, since the low pressure feed water heater 10 built in the condenser upper body 5 is eliminated, the height of the condenser upper body 5 can be lowered, and the height from the operation floor 13 to the upper end of the foundation mat 19 can be reduced. Therefore, the overall height of the turbine building can be reduced, and the overall volume of the building can be reduced. In the second embodiment, other configurations and operations are the same as those in the first embodiment.

Further, FIG. 13 shows a modification of the reference real施例2. FIG. 13 is an arrangement plan view of the lower surface of the turbine / generator installation floor (operating floor 13) of the turbine building in this modified example. The example of arrangement | positioning in case two are accommodated by arrangement | positioning of 2 horizontal rows is shown. FIG. 14 is a longitudinal sectional view in the short side direction thereof, and FIG. 15 is a longitudinal sectional view of the feed water heater tube drawing space 11 side of the low pressure feed water heater 10 built in the condenser upper body 5 in the long side direction.

Figure 16 is system when that integrates the first stage and the low-pressure feed water heater 10 of the second stage of the low-pressure feed water heater 10 of the fourth stage from the first stage was based the system of reference actual Example 1 The configuration is shown. In FIG. 16, the system configuration around the high-pressure turbine 6 and the moisture separator / heater 2 is the same as that in FIG. Among the low-pressure feed water heaters 10 installed in the condenser upper shell 5, the first and second low-pressure feed water heaters are transferred to the outside of the condenser upper shell 5. By integrating the low pressure feed water heaters 10-1a, 10-1b, 10-1c and 10-2a, 10-2b, 10-2c, which have been separately arranged for each of the devices 4a, 4b, 4c, into one / stage , A total of six low pressure feed water heaters 10 are reduced to two integrated low pressure feed water heaters 12.

Specifically, the first stage low-pressure feed water heater 10-1a Reference real施例1, 10-1b, first stage low-pressure feed water heater 12-1 integrates into one of three 10-1c, similarly The second stage low-pressure feed water heaters 10-2a, 10-2b, 10-2c of the first embodiment are integrated into a single second stage low-pressure feed water heater 12-2, and the third stage of the first embodiment. In addition, the fourth-stage low-pressure feed water heater is not integrated and is configured in a system configuration that is installed in each condenser upper trunk 5 in the same manner as in the first embodiment.

  The integrated first-stage and second-stage low-pressure feed water heaters 12-1 and 12-2 include third-stage and fourth-stage low-pressure feed water heaters 10-3a, b, The water supply piping 45 is integrated and connected from c, 10-4a, b, c. The drain pipe 44 is branched and connected from the second low-pressure feed water heater 12-2 to the third stage low-pressure feed water heater 10-3a, b, c with a built-in condenser. Moreover, the connection method of the extraction piping 40 from the low-pressure turbine 7 to the first-stage and second-stage low-pressure feed water heaters 12-1 and 12-2 is the same as the method described in FIG.

In this modification integrates with two low-pressure feed water heater 10 installed in the upper of the four / cylinder low-pressure feed water heater 10 of the arrangement of the two upper and lower stages horizontal two columns in Reference real Example 1 It is moved to the feed water heater tube carry-in / out space space 46 outside the condenser upper shell 5. This makes it possible to secure a wide space between the floor / beams of the operation floor 13 and the feed water heater tube drawing space 11 below the operation floor 13. Compared to the case where all the low-pressure feed heaters 10 built in the condenser upper shell are installed outside the condenser upper shell 5 by disposing the moisture separator heater 2 in this space, the upper portion of the condenser. The number of low-pressure feed water heaters 10 to be relocated to the outside of the body 5 is 3 series × 2 stage configuration = 6. By integrating these low-pressure feed water heaters in the same manner as described above, two / two stages are integrated. The low-pressure feed water heater 12 can be reduced, and the reduction of the installation location space of the low-pressure feed water heater and the increase in the length of the extraction pipe from the low-pressure turbine 7 can be suppressed.

  The arrangement space of the two integrated low-pressure feed water heaters 12 is an area on the outer wall side along the long side of the turbine building, where the low-pressure feed water heater tube carry-in / out space space 46 is secured as a space where no equipment, piping, etc. are installed. The two integrated low-pressure feed water heaters 12 are arranged in series and the feed water heater tube drawing space 11 of the integrated low-pressure feed water heater 12 is shared so that the turbine building dimensions are not affected. Is possible.

  Further, in this modified example, as shown in FIGS. 13 to 15, the feed water heater tube drawing space 11 of the low pressure feed water heater 10 built in the condenser upper body 5 does not interfere with the main body of the moisture separation heater 2. The height of the condenser upper body 5 is set, but the main steam inlet nozzle 36 of the moisture separation heater 2 is located at the lower part of the route of the main steam pipe 21 from the high pressure turbine 6 to the moisture separation heater 2. Therefore, the installation height of the pipe is almost the same as the feed water heater tube drawing space 11 of the low pressure feed water heater built in the condenser upper shell 5. Therefore, as a measure for avoiding interference between the main steam pipe 21 and the feed water heating tube drawing space 11 of the low pressure feed water heater 10 built in the condenser upper shell, the main steam pipe 21 is connected to the feed water heating tube drawing space 11 of the low pressure feed water heater 10. It is possible to avoid interference by setting a route that bypasses the feed water heating tube drawing space 11 of the low-pressure feed water heater 10 installed outside. In this modified example, the route plan detoured on the main steam pipe 21 side to avoid interference is shown. However, when the feed water heater tube is pulled out, the main steam pipe 21 is partially removed to bypass the pipe route of the main steam pipe 21. It is also possible to install a main steam pipe in the feed water heating tube drawing space 11 of the low pressure feed water heater 10 without doing so. Other configurations and operations are the same as those in the first embodiment.

Such references real施例2 and its modification condenser upper torso in a built-in low-pressure feed water heater moisture by relocating all or part outside condenser unit separator reheater 2 the operation floor 13 The size of the turbine building can be reduced by reducing the number of the low-pressure feed water heaters that have been relocated and reducing the space for placement by integrating them. It becomes possible to store without changing.

  Even when the moisture separator / heater 2 is arranged under the operation floor 13 by this arrangement method, the dimension of the long side direction of the turbine building 1 is not increased and does not become a critical factor in the construction process of the nuclear power plant. The dimension of the long side direction of the building 1 can be arrange | positioned by the building dimension equivalent to arrangement | positioning on the operation floor of the conventional moisture separation heater 2, and a turbine building is finished compactly. Furthermore, since the moisture separation heater room is not required from the area on the operation floor 13, both sides of the low-pressure turbine 7 can be used as the disassembly temporary storage area 29 at the time of regular inspection. In addition, the equipment cost can be reduced by reducing the number of water heaters.

(Reference real施例3)
FIG. 17 is an arrangement plan view of the operation floor surface of the turbine building according to the present invention, and FIG. 18 is a longitudinal sectional view in the short side direction when two low-pressure feed water heaters 10 are built in the upper body 5 of the condenser. Plan view. FIG. 19 is a longitudinal sectional view in the short side direction in the case where four low-pressure feed water heaters 10 are built in the upper condenser body 5 of the condenser. The reference actual Example 1 and in its variant condenser upper cylinder 5 to the low-pressure feed water heater 10 the moisture separator heater 2 in terms of incorporating two or four per cylinder and a low-pressure feed water heater 10 In order to avoid interference with the feed water heater tube drawing space 11, the installation level of the moisture separation heater 2 is raised, and the operation existing above the position where the moisture separation heater 2 is arranged according to the raising cost. A casing 34 which is a part of the floor 13 and is raised only on the operation floor 13 on both sides of the low-pressure turbine 7 is disposed.

In this reference the real施例fit portion and the same height of the operation floor 13 built by skeleton 34 was raised as above, part of the operation floor 13 of the surrounding also be raised over the entire region, the operation floor 13 The whole is flattened. Furthermore, the level of each floor 23 under the operation floor 13 and the floor level of the foundation mat 19 are sequentially raised. First, when raising the operation floor 13 over almost the entire area of the operation floor 13, the upper end surface of the turbine / generator installation base (TG base) 9 is not different from the conventional one. Since the surface of the upper end of the installation base (TG base) 9 and the surface of the raised operation floor 13 are the same level as the surface of the upper operation floor of the moisture separator / heater 2, a level difference of about 3 to 4 m is provided. Occurs.

  There is also a generator rotor extraction space 24 which is a space necessary for extracting the generator rotor from the generator 8. The operation floor 13 below the generator rotor pull-out space 24 needs to pull out the generator rotor horizontally and in the direction of the rotation axis with respect to the generator main body. Is set so that there is no step. In the turbine building configured with such an arrangement and floor level of the operation floor 13, the floor height under the operation floor 13 is increased by raising the operation floor (about 3 to 4 m in the case of 1350 MWe class). The height of the entire area can be secured higher than that of the conventional plant. As a result, in order to more rationally arrange the space under the operation floor 13, the floor level of each floor 23 under the operation floor 13 is raised in the same manner in the same manner so that the floor of the foundation mat 19 of the turbine building 1 is spread over the entire turbine building. The level can be set shallow.

  At this time, the floor level of the foundation mat 19 in the area 26 where the condenser is arranged, the arrangement area 27 such as the condensate pump and sump tank is determined in relation to the height of the condenser 4 body, so that it is raised. I can't. This is because the floor level of the foundation mat 19 in the lower part of the condenser 4 is determined by the basic height of the lower part of the condenser, and the floor level of the condenser pump is determined from the water level in the condenser. It is determined to secure the head pressure of the water, and it is necessary to place it at the base mat level equivalent to the base mat level below the condenser.

  Furthermore, the installation floor level of the equipment such as sump tank is determined from the viewpoint of securing the piping gradient arranged in the base mat for floor drain recovery, so the condenser installation area 26, the condensate pump and sump, Even when the surrounding mat floor level other than the area 27 where the tank or the like is arranged is raised, the floor level of this area cannot be raised.

By arranging in this way, there is a difference in level between the 19 floor level of the foundation mat in the area where the condenser and the condensate pump are installed and the 19 floor level of the surrounding foundation mat. By adopting a turbine building foundation mat shape that only excavates the foundation mat in the area where water pumps are installed, the construction cost can be reduced by reducing the volume of the building and reducing the amount of excavated material. The operation floor has a level difference between the turbine / generator installation base (TG base) 9 floor and the floor of the generator pull-out area, so that the worker can access by installing the access stairs 20. Since the entire area of the surrounding operation floor can be flattened, it is easy to secure a laydown space for large-scale decomposition products from the viewpoint of securing the operation floor laydown space, which is one of the obstructions in reducing the building floor dimensions. It can be expected to improve workability at the time. Other construction and operation are described above in reference actual Example 1 or the same as the modification of the reference real Example 1, when a same manner as in Reference Example 1, as shown in FIG. 19, or reference a real If similar to the modification of example 1 is made as shown in Figure 18, basal mat 19 of the turbine building 1 in each case is shallow from the ground surface as compared to the other references the actual施例Can be set to position.

(Example of the present invention)
Figure 20 is a layout plan view of the equipment in the upper surface of the operation floor 13 of the turbine building 1 according to the embodiment of the present invention, FIG 21 is four low-pressure feed water heater per cylinder to the condenser upper cylinder 5 It is a longitudinal cross-sectional view of the short side direction when 10 is built. In the present embodiment, four low-pressure feed water heaters 10 / cylinder are installed in the condenser upper trunk 5, and a feed water heater tube drawing space 11 is secured on one side of the condenser upper trunk 5. At this time, one moisture separation heater 2 is arranged on the side opposite to the condenser upper trunk 5 below the operation floor 13 on the side opposite to the feed water heater tube drawing space 11 across the condenser upper trunk 5. On the other hand, another moisture separation heater 2 installed on the feed water heater tube drawing space 11 side is arranged on the upper part of the operation floor 13 in order to avoid interference with the feed water heater tube drawing space 11. The operation floor 13 is arranged at the same floor height as the upper end surface of the turbine / generator installation base 9, and the moisture separation heater 2 on the operation floor 13 is covered with a moisture separation heater room shielding housing 15. Thus, radiation is prevented from reaching the space above the operation floor. A part of the moisture separating heater chamber shielding housing 15 is constituted by a removable wall 22 and is removed when the heater is pulled out from the moisture separating heater 2 to the heater extraction space 3 for inspection or replacement. Or it can be reassembled to the original wall after the replacement. Other construction and operation of this embodiment is the same as that already described in Reference actual Example 1.

  Thus, the moisture separation heater 2 on one side is disposed under the operation floor 13, and the moisture separation heater 2 on the other side is disposed on the operation floor 13. The two moisture separation heaters 2 can be arranged close to both sides of the low-pressure turbine 7 without being affected by the number. As a result, as compared with the conventional case where two moisture separation heaters are arranged on the operation floor, only one moisture separation heater 2 is arranged on the operation floor 13 in this embodiment. It is possible to secure a wide laydown space 29 on the operation floor 13 to be used for temporary placement of a disassembled product of each turbine or generator 8 that is performed at the time of periodic inspection (regular inspection) of each turbine or generator 8. is there.

  Further, when the moisture separation heater 2 is disposed under the operation floor as in the prior art, the moisture separation heater 2 is avoided in order to avoid interference between the moisture separation heater 2 and the feed water heater tube drawing space 11. However, in this embodiment, two moisture separation heaters 2 are used. However, in the present embodiment, the length of the turbine building 1 is increased. Can be arranged on both sides with the low-pressure turbine 7 interposed therebetween, so that it is possible to suppress the dimension in the long side direction of the turbine building 1 (reduced by about 10 to 12 m in the 1350 MWe class), thereby reducing the construction cost of the turbine building and the construction Shortening of the process can be expected.

  Furthermore, this embodiment can be partially modified as follows. The content of the change is that the operation floor 13 at the top of the moisture separator / heater 2 is raised to a height exceeding the upper end surface of the turbine / generator installation base 9 as in the first embodiment, and the operation in one side area of the low-pressure turbine 7 is performed. By flattening the floor laydown area 29, it is possible to construct an arrangement that facilitates securing a laydown space for a large disassembled product.

In the reference examples 1 to 3 and the embodiment of the present invention, the installation position of the moisture separator / heater 2 has been described based on both sides of the low-pressure turbine 7. However, as shown in FIG. It is also possible to arrange the heater 2 close to the high-pressure turbine 6 side (in the case of 1350 MWe class, move about 10 to 15 m and place it in the area under the operation floor 13 on both sides of the low-pressure turbine 7 and the high-pressure turbine 6).

  The present invention is used for arrangement of equipment in a turbine building of a nuclear power plant.

It is a system diagram of a steam and water system in the turbine building by reference actual Example 1 relating to the present invention. It is a longitudinal cross-sectional view of the moisture separation heater of FIG. It is a plane arrangement drawing of each apparatus and composition under a turbine building operation floor of a turbine building by reference example 1. It is a plane arrangement drawing of each apparatus and composition on a turbine building operation floor of a turbine building by reference example 1. It is a longitudinal cross-sectional view of the short side direction in the turbine building of FIG. It is a longitudinal cross-sectional view of the long side direction in the turbine building of FIG. It is a plane layout drawing of each apparatus and composition under the turbine building operation floor of the turbine building by the modification of reference example 1. It is a longitudinal cross-sectional view of the short side direction in the turbine building of FIG. It is a plane arrangement drawing of each apparatus and composition under the turbine building operation floor of the turbine building by reference example 2 relevant to the present invention. It is a longitudinal cross-sectional view of the short side direction in the turbine building of FIG. It is a longitudinal cross-sectional view of the long side direction in the turbine building of FIG. It is a system diagram of a steam and feedwater lines of the reference real施例2 by the turbine building related to the present invention. It is a plane layout drawing of each apparatus and composition under the turbine building operation floor of the turbine building by the modification of reference example 2. It is a longitudinal cross-sectional view of the short side direction in the turbine building of FIG. It is a longitudinal cross-sectional view of the long side direction in the turbine building of FIG. It is a systematic diagram of the steam and water supply system in the turbine building according to a modification of Reference Example 2. It is a flat layout view of the devices and configuration in the associated reference for by real施例3 turbine building turbine building operation floor to the present invention. It is a longitudinal cross-sectional view of the short side direction in the turbine building of FIG. It is a longitudinal sectional view of a short side direction of the turbine building by modification of the reference real施例3. It is a plane arrangement drawing of each apparatus and composition on the turbine building operation floor of the turbine building by the example of the present invention. The longitudinal cross-sectional view of the short side direction in the turbine building of FIG. It is the figure which showed the variation of another plane arrangement regarding arrangement | positioning of a moisture separation heater.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Turbine building, 2, 2a, 2b ... Moisture separation heater, 3 ... Heater extraction space, 4, 4a, 4b, 4c ... Condenser, 5, 5a, 5b, 5c ... Condenser upper trunk, 6 ... High-pressure turbine, 7, 7a, 7b, 7c ... Low-pressure turbine, 8 ... Generator, 9 ... Turbine / generator installation base, 10, 10-1a, 10-1b, 10-1c, 10-2a, 10- 2b, 10-2c, 10-3a, 10-3b, 10-3c, 10-4a, 10-4b, 10-4c, 12, 12-1, 12-2 ... low pressure feed water heater, 11 ... feed water heater Tube drawing space, 13 ... Turbine building operation floor (operation floor), 14 ... Overhead crane, 15 ... Moisture separation heater room shielding housing, 16 ... Low pressure condensate pump, 17 ... Combination intermediate valve, 18 ... Condensate filtration device , 19 ... Basic mat, 20 ... Stairs for access DESCRIPTION OF SYMBOLS 21 ... Main steam piping, 22 ... Removable wall, 23 ... Each floor under operation floor, 24 ... Generator rotor extraction space, 25 ... Condensate demineralizer, 26 ... Condenser installation area, 27 ... Condensate pump , Sump / tank installation area, 28 ... turbine / generator rotating shaft, 29 ... turbine / generator disassembled product temporary storage area (laydown area), 30 ... low pressure turbine steam inlet nozzle, 31 ... combined intermediate valve room, 33 ... Combination intermediate valve carry-in / out hatch 34: Raised housing 35: Main steam outlet nozzle 36 ... Main steam inlet nozzle 37: High pressure condensate pump 38, 38-1a, 38-1b, 38-2a, 38 -2b ... High-pressure feed water heater, 39 ... Reactor feed pump, 40 ... Extraction piping, 41 ... Air extractor, 42 ... Ground steam condenser, 43 ... Main steam stop valve / regulator valve, 44 ... Len piping, 45 ... water supply piping, 46 ... feed water heater tube carry-in / out space space, 47 ... fuselage, 48 ... end plate, 49 ... moisture separator, 50, 50a, 50b ... first stage heater, 51, 51a, 51b ... second stage heater, 52 ... bleeding steam from high-pressure turbine, 53 ... bleeding steam from the main steam stop valve / regulation valve front side, 54 ... drain nozzle.

Claims (1)

The turbine building of the nuclear power plant,
An operation floor for vertically dividing the turbine building;
A turbine / generator installation stand installed in the turbine building;
A high-pressure turbine and a plurality of low-pressure turbines installed on the turbine / generator installation base;
A generator installed on the turbine / generator installation stand and driven by each turbine;
A condenser installed below the low-pressure turbine and condensing steam received from the low-pressure feed water heater as feed water to a reactor pressure vessel;
A condenser upper body disposed between the condenser and each low pressure turbine;
A plurality of low-pressure feed water heaters installed in the condenser upper body and receiving steam from each of the low-pressure turbines to heat the feed water in multiple stages;
Wherein said operation floor upper positioned above the tube withdrawal space of the low-pressure feed water heater, a lower side of the operation floor opposite the tube withdrawal space across the turbine generator installation stand, the low-pressure turbine DOO across disposed respectively, and a plurality of the moisture separator heater for dehumidifying and heating the steam supplied from the high pressure turbine to the low pressure turbine, a nuclear power plant turbine building equipped.

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