JP3999908B2 - Nuclear power plant pumping equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump facility and a maintenance facility for a nuclear power plant.
[0002]
[Prior art]
A conventional pump facility in a nuclear power plant will be described with reference to FIG. In FIG. 16, reference numeral 1 is, for example, a building housing of a nuclear power plant, 2 is an equipment room, and 3 is a vertical axis pump. The vertical pump 3 mainly includes a pump body 4 and a pump casing 5, and is suspended from the ceiling of the equipment room 2 via a pump support 6.
[0003]
In the nuclear power plant, the vertical axis pump 3 suspended from the building housing 1 etc. has special maintenance characteristics of the pump body 4 and maintenance characteristics of the suction valve and the discharge valve 8 associated with the piping 7 of the vertical axis pump 3. In order to secure without a complicated piping route, it will be installed in the equipment room 2 with a high floor.
[0004]
In addition, when the maintenance of the vertical axis pump 3 is performed, the pump main body 4 is directed vertically downward, and the motor, rotor, impeller and the like incorporated in the pump main body 4 are pulled out. Since the suction port and the discharge port are provided in the upper part of the pump, the suction and discharge pipes 7, the suction valve and the discharge valve 8 are located above the vertical pump 3, that is, the vertical pump 3 is installed unless there is a special request. It is installed above the equipment room 2 to be operated.
[0005]
In this case, in order to ensure the maintainability of both the pump body 4 and the suction valve and the discharge valve 8, a height L is required above the equipment chamber 2 so that the worker 10 can access each of the valves 8. At the same time, it is necessary to have a space and a height L that can be used as a maintenance area by the operator 10 when maintaining the vertical axis pump 3.
[0006]
Therefore, the floor height in the equipment room 2 is required to be twice the access height L (usually about 1.8 m or more) of the worker 10 and the thickness of the mount 9 at a minimum, and the height of the equipment room 2 is reduced. Was inhibiting. Further, in the installation work of the vertical pump 3, the vertical pump 3 is lifted in the vertical direction and installed.
[0007]
Furthermore, if the vertical axis pump 3 transports the radioactive fluid, the worker is exposed to radiation during the maintenance work. However, reducing the access height L of the worker 10 can improve the workability. This will lead to an increase in exposure with worsening of work and delay of work.
[0008]
Here, based on the procedures a to h in FIG. 17, a conventional maintenance method for the suspended vertical pump 3 will be described.
a. The fluid in the pump casing 5 and the motor is drained, and after cleaning, the incidental equipment 12 and the like that hinder disassembly of the motor cooling pipes and the like are removed. b. In order to pull out the motor unit 15 including the impeller 13 and the rotor 14 vertically downward, the motor unit 15 is supported by a lifting machine 16 such as a chain block through a hanging hook attached to the pump casing 5.
[0009]
c. Remove the part where the motor unit 15 and the pump casing 5 are mechanically joined (nut 17 etc.). d. A motor unit 15 is suspended from a moving carriage 11 prepared below the vertical pump 3 using a lifting machine 16. e. In order to pull out the impeller 13 and the rotor 14 upward from the motor unit 15, the carriage is moved from the position directly below the vertical axis pump 3 to the pump maintenance area where the monorail 18, the lifting hook 16 and the like where the hanging hook is installed can be used. 11 moves the motor unit 15.
[0010]
f. In order to disassemble the motor unit 15, the motor unit 15 is transferred from the carriage 11 to the motor unit support base 19. g. The impeller 13 is pulled out vertically from the rotor 14 by human power or a lifting machine 16. h. Next, the rotor 14 is pulled out vertically from the motor casing 20 by the lifting machine 16. i. Also remove the motor rear cover 21. j. After inspecting and cleaning the disassembled parts, the assembly is performed in the reverse order of the series of operations.
[0011]
As described above, the maintenance work of the vertical axis pump 3 is performed. The motor unit 15 is disassembled by removing the rear cover 21 from the floor A, the height B of the motor casing 20, the pulling height C of the rotor 14, The required height D of the lifting machine 16 is required.
[0012]
[Problems to be solved by the invention]
When the vertical axis pump 3 is installed, the pump body 4 is long in the vertical direction, and the maintenance of the vertical axis pump 3 is a height for pulling out and disassembling the motor unit 15 including the motor, impeller and the like from the pump casing 5 in the vertical direction. And the vertical dimension of the vertical pump 3 is sufficient for the maintenance space of the vertical axis pump 3 and the valve 8 associated with the vertical axis pump 3. Limited to the high part.
[0013]
Moreover, when installing the vertical axis pump 3, it is a work at a high place, which requires labor and time. When disassembling the motor, impeller, etc. of the vertical axis pump 3, the motor unit 15 including them is installed in the vertical direction. Then, the pump casing 5 is pulled out and then transported to the laydown area. Thereafter, the impeller 13 and the rotor 14 are pulled out and disassembled using the lifting machine 16 and the like. Therefore, work is troublesome, and in particular, the radiation exposure of workers becomes a problem in the case of a pump for transferring a radioactive fluid.
[0014]
To reduce the cost of plant facilities at nuclear power plants, reduction of building dimensions and rationalization of construction are desired. For plant maintenance work, improvement of worker efficiency and reduction of radiation exposure are desired. Installation of vertical axis pump 3 and piping In addition, it is desired to reduce the amount of work and the amount of exposure at the time of arrangement and construction of valves and pump maintenance, and satisfying these demands is a problem.
[0015]
The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the floor height of the building where the suspension support type vertical axis pump is installed, to improve workability, to save labor during pump maintenance, and to reduce radiation exposure. Furthermore, another object of the present invention is to provide a nuclear power plant pump facility and its maintenance facility for the purpose of rationally arranging the number of maintenance devices.
[0016]
The invention of claim 1 A maintenance room is provided on the lower floor of the equipment room where the vertical axis pump is installed, the vertical axis pump is suspended from the ceiling, and a hatch is provided on the floor located below the vertical axis pump in the equipment room. It is characterized by that.
[0017]
The invention of claim 2 The ceiling has a pump body of the vertical axis pump, devices attached to the pump, and other devices attached in advance to a driving form to form an integrated structure, and the integrated structure is directly suspended at a predetermined position on the construction site. To the ceiling of the equipment room It is characterized by that.
[0018]
The invention of claim 3 A maintenance room is provided on the lower floor of the equipment room where the vertical axis pump is installed, the pump casing part of the vertical axis pump is supported and fixed to the floor in the equipment room, and the piping side of the vertical axis pump is arranged in the equipment room. The pump body side is arranged in the maintenance chamber It is characterized by that.
[0019]
The invention of claim 4 The floor has a floor block structure in which a pump body of the vertical axis pump, equipment associated with the pump and other equipment are previously attached to a driving form, and the floor block structure is directly placed at a predetermined position on the construction site. Suspend to make the floor of the equipment room It is characterized by that.
[0028]
In the vertical axis pump facility according to the present invention having the above-described configuration, the size and volume of the equipment room or the pump room in which the vertical axis pump is installed can be reduced. Further, in the case of a vertical pump for transferring a radioactive fluid, work safety can be ensured and labor costs can be reduced by reducing radiation exposure during maintenance work.
[0029]
In addition, it is possible to shorten the work period by adopting the prior installation of equipment, adopting a large module construction method, and to delete the shielding labyrinth by sharing the exposure reducing device, thereby reducing the cost and the planar dimensions.
[0030]
On the other hand, in the pump maintenance facility, the motor and impeller associated with the vertical axis pump are pulled out, and a frame rotating mechanism, a cart fixing mechanism, a remote control function, etc. are attached to the cart for moving the pump. Safety can be ensured, positioning of the carriage can be simplified, the amount of pump maintenance work can be reduced, and the radiation exposure of workers can be reduced.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a longitudinal pump facility according to the present invention will be described with reference to FIG.
In FIG. 1, the same parts as those in FIG. In the present embodiment, an equipment room 24 having a floor height lower than that of the conventional example is provided in the building housing 23, and the vertical pump 3 is suspended from the ceiling in the equipment room 24 and provided adjacent to the equipment room 24. In other words, the pipe 7, the suction valve, and the discharge valve (hereinafter referred to as a valve) 8 are disposed in the adjacent chamber 25.
[0032]
That is, in FIG. 1, a pipe 7 and a valve 8 associated with the vertical pump 3 are arranged in an adjacent chamber 25 adjacent to the equipment room 24 where the vertical pump 3 is installed, and the vertical pump 3 and the valve 8 are arranged in parallel. To do. Thereby, in the pump side area, maintenance of the valve in the upper part of the equipment room 24 is not necessary because there is no valve, and the floor height in the equipment room 24 can be determined only by the required height for pump maintenance.
[0033]
For the valve area, the level of the valve maintenance stand 9 can be set by considering only the position of the valve 8 regardless of the required height of the pump maintenance, improving the vertical freedom of arrangement and reducing the floor height of the equipment room 24. It is possible to do.
[0034]
In addition, the floor height is reduced, and the length of the support structure (hereinafter referred to as pump support 6) of the suspension support type vertical axis pump 3 is shortened, so that the moment applied to the pump support 6 is reduced and the earthquake resistance is improved. Can be achieved.
[0035]
When the vertical axis pump 3 and the valve 8 are separated by the wall, the piping 7 arranged on the pump area side is set to be the shortest from the viewpoint of economy, that is, this is the piping in the equipment room 24. The length is shorter than when the valves are arranged in the same chamber, and means that the radiation source in the device chamber 24 is reduced when the vertical pump 3 transfers the radioactive fluid. Therefore, it is possible to reduce the radiation exposure of workers during pump maintenance.
[0036]
Next, according to FIG. Book A second embodiment of the invention will be described. In this embodiment, as shown in FIG. 2, the vertical pump 3 is suspended from the ceiling in the equipment room 24 having a low floor height, and the vertical pump is installed in the upper room 26 provided on the upper floor of the equipment room 24. 3 is that a pipe 7 and a valve 8 associated with the valve 3 are arranged.
[0037]
According to the present invention, the valve 8 associated with the vertical pump 3 is arranged in the upper floor room of the equipment room 24 where the vertical pump 3 is installed, and the vertical pump 3 and the valve 8 are divided vertically. As a result, the floor height in the equipment room 24 can be determined only by the required height for pump maintenance, as in the above embodiment.
[0038]
In the valve area, the valve 8 can be arranged near the floor level. For the maintenance of the valve 8, the access height of the operator 10 is sufficient, and the height of the upper chamber 26 where the valve is installed can be freely set. The degree of improvement improves the floor height of the equipment room 24. Further, as in the case described above, improvement of earthquake resistance and reduction of exposure of workers during pump maintenance can be achieved when a radioactive fluid is handled.
[0039]
Next, according to FIG. Book A third embodiment of the invention will be described. In the present embodiment, the vertical pump 3 is suspended from the ceiling in the equipment room 2 where the floor height is high, the hatch 28 is provided on the floor located below the vertical pump 3 in the equipment room 2, and the vertical pump The maintenance room 29 is provided in the room on the lower floor of the equipment room 2 in which 3 is installed.
[0040]
Here, in the conventional maintenance procedures d and e of FIG. 17, in order to pull out the motor unit 15 from the pump casing 5, it is necessary to suspend the motor unit 15 downward from the pump casing bolt 22, and thus from the pump installation position. The minimum height to the floor was determined.
[0041]
However, according to the present embodiment, by providing the hatch 28 on the floor 27 under the pump 3, if the hatch 28 is thick enough to handle the hatch 28 at the bottom of the pump, the floor of the pump installation area The motor unit 15 can be pulled out and transferred to the maintenance room 29 on the lower floor regardless of the height, and the floor height of the pump installation area can be reduced. In addition, maintenance can be performed in an area where there is no piping containing radioactive fluid on the lower floor, and exposure during maintenance can be reduced.
[0042]
Next, according to FIG. Book A fourth embodiment of the invention will be described. In the present embodiment, a maintenance chamber 29 is provided on the lower floor of the vertical pump 3, and the pump casing 5 portion of the vertical pump 3 is directly supported and fixed from the housing of the floor 27 via a steel support member 30. .
[0043]
According to the present embodiment, the vertical axis pump 3 can be supported near the position of the center of gravity, and the moment can be reduced as compared with the case where the pump support 6 is installed above the pump casing 5 as shown in FIG. Can contribute to the improvement of earthquake resistance.
[0044]
Further, when the vertical axis pump 3 handles the radioactive fluid, the radioactive fluid does not flow downward from the pump casing 5, that is, downward from the slab lower end level of the floor 27. This is because the motor casing is below the pump casing 5.
[0045]
Therefore, since the radiation source is limited to the pump casing 5 portion in the motor side area both during normal pump operation and during maintenance of the vertical pump 3, it is possible to reduce the exposure of workers in this area. .
[0046]
Next, according to FIG. Book A fifth embodiment of the invention will be described. In the present embodiment, as shown in FIG. 5, a right side pump chamber 34 and a left side pump chamber 35 are partitioned in a building housing 31 by a vertical partition wall 32 and a horizontal partition wall 33. The right pump 3 a is disposed in the right pump chamber 34, and the left pump 3 b is disposed in the left pump chamber 35.
[0047]
A curtain rail 36 is laid on the front surface of the lateral partition wall 33, and a shielding curtain 37 is attached to the curtain rail 36. An entrance / exit 38 is provided in the building housing 31, and a maintenance area 39 is defined between the entrance / exit 38 side and the curtain rail 36.
[0048]
That is, in the present embodiment, the shielding curtain 37 is shared by the pump chambers 34 and 35 for transferring two adjacent radioactive fluids. Normally, two or more pumps that handle radioactive fluid in nuclear power plants are installed for the same purpose in consideration of redundancy.
[0049]
Therefore, at the time of maintenance of such pumps 3a and 3b, at least one of the plurality of pumps 3a and 3b may always be in operation. Further, from the viewpoint of economic efficiency of the power plant building, the maintenance area 39 may be shared for the pumps 3a and 3b having the same application as shown by the shaded portion in FIG.
[0050]
In this case, during maintenance of the left pump 3b in the figure, workers in the maintenance area 39 are exposed to radiation from the right pump 3a in front of the entrance of the right pump chamber 34. When the right pump 3a is in operation, the amount of exposure to workers increases.
[0051]
On the other hand, in the present embodiment, a shielding curtain 37 made of a material having shielding performance is shared through the curtain rail 36 in front of the entrances of the two pump chambers 34, 35 sharing the maintenance area 39, and the right pump 3a. At the time of maintenance, exposure of workers in the maintenance area 39 due to radiation from the left pump 3b can be reduced, and the portions of the maintenance area 39 in front of the pump chambers 34 and 35 can be used effectively as work areas.
[0052]
Next According to Fig. 6 (a) Book A sixth embodiment of the invention will be described. In the present embodiment, as shown in FIG. 6A, a pump chamber 40 having an entrance 38 and a maintenance area 39 is provided in a building housing 31, and a vertical pump 3 is installed in the pump chamber 40. The axial pump 3 is that a shielding door 41 having a mechanism that slides in the lateral direction of the front surface of the vertical pump 3 is installed. FIG. 6B shows the arrangement of a conventional pump facility, and a labyrinth wall 43 is provided by providing a labyrinth wall 42 so that the vertical axis pump 3, the pipe 7 and the valve 8, which are radiation sources, cannot be directly viewed from the pump chamber entrance. Forming a maze.
[0053]
In the present embodiment, by installing a shielding door 41 having a sliding mechanism, the vertical axis pump 3, which is a radiation source, the piping 7, and the valve 8 except when the vertical axis pump 3 is pulled out to the maintenance area 39 during maintenance. On the other hand, the shielding door 41 can be closed so as not to look directly.
[0054]
In addition, since the work is performed in an area where the pipe 7 and the valve 8 are not directly viewed during the pump maintenance, the exposure of workers can be reduced. Further, the conventional labyrinth wall 42 for shielding is not required, and the space inside the pump chamber 40 can be reduced by eliminating the labyrinth passage 43.
[0055]
Next, according to FIG. Book A seventh embodiment of the invention will be described. In this embodiment, as shown in FIG. 7, the pump support 6, the pipe support 45 and the duct support 46 are fixed to the driving form 44, the pump casing 5 is attached to the pump support 6, and the pipe 7 is attached to the pipe support 45. The installation is such that a duct 47 is attached to a duct support 46 as a ceiling of the pump chamber.
[0056]
That is, a pump (not shown) and a pump casing 5 which is a part of the pump, a pump support 6, a mount (not shown), a pump suction, a discharge pipe 7 and a valve (not shown), a duct 47, a cable tray (Not shown), a case-embedded device (not shown), and other devices are previously attached to the driving form 44, which is an integrated structure.
[0057]
According to the present embodiment, an integral structure with a driving form 44 at a predetermined position on the construction site is hung by a large lifting machine (not shown) via a lifting device 48 and the ceiling of the pump chamber. To do. The action by this is to hang a monolithic structure, construct a reinforcing bar (not shown) on the upper surface of the placing form 44 and construct a floor by placing concrete.
[0058]
In addition, the lower surface of the placement form 44 becomes a ceiling as it is, and the ceiling (floor) of the building is easily constructed by connecting equipment such as the pipe 7 and the duct 47. Therefore, it is possible to greatly reduce the work on site and shorten the construction period. In addition, the installation of the suspension support pump is not carried out in a narrow area in the pump room after the building is built, but in a work space with good workability at the factory or outside of the building when building an integrated structure. This makes it possible to improve work efficiency.
[0059]
Next, according to FIG. Book An eighth embodiment of the invention will be described. In the present embodiment, as shown in FIG. 8, not only the pump casing 5 and the pump support 6 of the vertical pump 3 and the devices associated with the vertical pump 3 but also other devices such as the cable tray 49 are driven. A large block (floor block) 51 is formed as a floor unit using a formwork 44, a reinforcing member 50 for holding the weight of the cast concrete, and other steel materials. In addition, equipment such as a floor buried pipe 7 and a reinforcing bar (not shown) at the lower end of the floor are installed on the upper surface of the floor placement form 44.
[0060]
According to the present embodiment, the large block 51 is directly suspended by a large lifting machine (not shown) via the balance 52 and the lifting tool 48 at a predetermined position on the construction site. As a result of this, after the large block 51 is suspended, an upper end reinforcing bar (not shown) is constructed on the upper surface of the placing mold 44, and concrete is placed, so that a floor is easily constructed.
[0061]
In addition, although the lower surface becomes the ceiling as it is, the setting material 44 and the installation work and the removal work of the support work (not shown) are unnecessary by the reinforcing material 50 on the lower surface, and the construction process and the work period can be shortened. Further, as described above, it is possible to improve the efficiency of the installation work of the vertical support pump 3 of the suspension type support.
[0062]
Next Figure 9 (a) and (b) Book A ninth embodiment of the invention will be described. FIG. 9A is a diagram showing a shielding auxiliary device inside the pump casing 5 at the time of pump maintenance in the present embodiment. A flat plate having shielding performance is used as the shielding lid 53 in the pump casing 5, and this is used as the vertical axis. A hinge 54 capable of moving in a plane direction from the position near the pump 3 to the rotation axis center of the vertical pump 3 and a vertical movement and support of a lid 53 attached to the hinge 54 are made possible by a ball screw (not shown). It is configured by being supported by a support base 55 with ball screws. The support base 55 is mechanically joined to the wall via the hinge 54.
[0063]
Next, the shielding method at the time of pump maintenance using the shielding lid 53 of the pump casing 5 of the present embodiment will be described with reference to FIGS.
The state shown in the maintenance procedures d and e of FIG. 17, that is, after the motor unit 15 is removed from the pump casing 5, the shielding lid 53 and the support base 55 with the ball screw are moved to the axial center position of the pump casing 5 by the hinge 54. As shown in FIG. 9B, the bolt insertion hole 57 set in the shielding lid 53 is adjusted so that the position of the pump casing bolt 56 attached to the casing coincides. At this time, the shielding lid 53 is rotatable on the support base 55 with respect to the vertical axis.
[0064]
Next, the pump casing 5 is operated while supporting the weight of the vertical vertical shielding cover 53 by the operation of the ball screw by a handle (not shown) for operating the ball screw and passing the bolt 56 through the bolt insertion hole 57 of the shielding lid 53. Attach to the body. Thereafter, the shielding lid 53 is fixed to the pump casing 5 using the nut 58 of the pump casing.
[0065]
By mounting the shielding lid 53, it is possible to shield radiation from the activated portion inside the pump casing 5, and it is possible to reduce exposure of workers performing maintenance work in the vicinity thereof. In addition, the installation work of the shielding lid 53 is an upward work, and there is a possibility of work exceeding the height of the worker, and there is a burden of supporting the weight of the shielding lid 53, but the shielding work is performed by operating the ball screw. The position of the lid 53 can be easily adjusted, and the work can be reduced.
[0066]
Next Figure 10, Figure 11 (a), Figure 12 and Figure 17 Book A tenth embodiment of the invention will be described. In the present embodiment, as shown in FIG. 10, a frame 59 is attached to the upper portion of a carriage 61 by a supporting wedge 62, and a motor unit fixing member 64 having a casing fixing hole 63 is provided in the frame 59 to provide maintenance equipment for pump equipment. It is in the configuration.
[0067]
This embodiment is in a maintenance device that handles the motor unit 15 shown in FIG. 17 during pump maintenance. That is, the motor unit 15 fixed to the frame 59 for fixing and supporting the motor unit 15 separated from the pump casing 5 of the vertical axis pump 3 also serves as a rotating shaft and a receiving shaft for the rotating shaft that can rotate in the vertical plane together with the frame 59. A support wedge 62 for fixing the rotational position of a carriage 61 with wheels 60, and a motor unit fixing member 64 having a casing fixing hole 63 provided in the frame 59.
[0068]
Next, a pump maintenance method using the maintenance device of the present embodiment will be described with reference to FIGS.
The state shown in the maintenance procedures d and e of FIG. 17, that is, after the motor unit 15 is removed from the pump casing 5, the motor unit 15 is suspended from the carriage 61 (reference numeral 11 in FIG. 17).
[0069]
Next, as shown in step f shown in FIG. 15, the carriage 61 on which the motor unit 15 is mounted is moved from above to an area where the lifting machine 16 can be used. During this movement, the frame 59 is fixed to the carriage 61 by the supporting wedge 62, and the motor unit 15 is fixed to the frame 59 through bolts in the casing fixing hole 63 set in the frame 59 and the screw hole 66 set in the pump casing 5. (Refer to the conceptual diagram of FIG. 10 and the elevation view of FIG. 11A).
[0070]
In step g, the carriage 61 is fixed by the ring stopper 65 within the usable range of the lifting machine 16. The supporting wedge 62 that fixes the frame 59 to the carriage 61 is removed while supporting the pump motor lower part by the lifting machine 16, and the pump motor lower part is lifted to make the pump motor rotating shaft horizontal. The support wedge 62 is inserted and fixed to a position where it can be fixed in this state. Thereafter, the impeller 13 is pulled out from the rotor 14 by human power or a lifting machine 16 in the horizontal direction.
[0071]
In step h, the rotor 14 is pulled out from the motor casing 20 in the horizontal direction by the lifting machine 16. In addition, the motor rear cover 21 and the like are also disassembled, and after inspection and cleaning of various parts, assembly is performed in the reverse order of the series of operations.
[0072]
Although the maintenance work is as described above, in this work, the motor unit 15 can be disassembled by removing the rear cover 21 from the floor A, the height B of the motor casing 20, and the rotor 14 being pulled out as in the prior art. The height C in the vertical direction is unnecessary, and the required floor height of the maintenance area can be reduced (see FIG. 17).
[0073]
Also, since the disassembly handling height of the impeller 13, rotor 14 and rear cover 21 is within the range of the height of the worker, the work height and work efficiency are reduced and the work table is reduced compared to the conventional method. Can be planned.
[0074]
Next Figure 11 (a) and (b) Book An eleventh embodiment of the invention will be described. In this embodiment, in the tenth embodiment, as shown in FIGS. 11A and 11B, a carriage fixing mechanism 67 having the structure shown in FIG. There is.
[0075]
The carriage fixing mechanism 67 includes a handle 68, a ball screw 69 rotated by the handle 68, a fixing base 70 attached to a lower end portion of the ball screw 69, a base plate 71 provided on the lower surface of the fixing base 70, and a handle 68 And a hinge arm 73 attached to a fixed base 71.
[0076]
The cart fixing mechanism 67 can fix and support the weight of the cart 61 by the operation of the ball screw 69 by rotating the handle 68. In the maintenance facility, it is possible to delete the ring stopper 65 that fixes the carriage 61, and work stability during pump maintenance is ensured.
[0077]
Further, when the floor of the building is inclined due to drainage or the like, the tilt of the carriage 61 can be eliminated by the mechanism 67, and the pump parts can be pulled out and disassembled with high accuracy.
[0078]
Next Figure 12 (a) and (b) Book A twelfth embodiment of the invention will be described. In this embodiment, the carriage 61 is attached to a pulley 74 for running and guiding the carriage 61 in the pump chamber 40, and the carriage 61 is caused to run by hooking a rope 75 on the pulley 74. That is, as shown in FIG. 12A, a pulley 74 is attached to the wall surface of the casing 31 of the pump chamber 40, and the movement of the transport carriage 61 of the motor unit 15 is remotely controlled using the pulley 74 and the rope 75. Is possible. A pump maintenance method using this maintenance facility will be described with reference to FIG. When the vertical axis pump 3 is maintained, the motor unit 15 may be transported to a maintenance area other than the pump chamber 40.
[0079]
This is because when the vertical axis pump 3 handles a radioactive fluid, the pipe 7, the valve 8 and the like in the pump chamber 40 are activated or become a radiation source in a state containing the radioactive fluid. This is because it may cause exposure of workers in the chamber 40.
[0080]
In addition, for this reason, a labyrinth wall 42 that is not exposed at the entrance 38 of the pump chamber 40 is installed. When the vertical axis pump 3 is transported to the maintenance area, it is necessary to prevent exposure of workers during transportation.
[0081]
In this embodiment, the carriage 61 is moved straight by human power until the stopper (not shown) of the carriage 61 comes into contact with the wall in the depth direction of the pump chamber 40 from the portion of the wall entrance / exit 38 as shown in FIG. . Thereafter, as shown in (b), the rope 75 attached to the carriage 61 is stretched, and the rope 75 is operated by a manual force or a mechanical drive mechanism via the pulley 74 to guide the carriage 61 to the pump installation position. At this time, the worker performs a monitoring operation on the opposite side of the labyrinth wall 42 to the pump.
[0082]
Next, the vertical axis pump 3 is disassembled, and after the motor unit 15 is placed on the carriage 61, the motor unit 15 is carried out of the pump chamber 40 in the reverse procedure by operating the rope 75. These operations prevent the worker from approaching the radiation source when the carriage 61 carries the motor unit 15. As a result, radiation exposure during pump maintenance work can be reduced, and positioning of the carriage 61 under the pump can be accurately performed by guidance with the pulley 74.
[0083]
Although not shown in the present embodiment, an automatic lifting mechanism for the motor unit 15, an automatic attachment / detachment device for the joint bolt between the motor unit 15 and the pump casing 5, etc. are attached to the carriage 61. It is also possible to reduce exposure.
[0084]
In addition, in the pump chamber 40, the floor may have a gradient to collect radioactive fluid, etc., but in order to eliminate instability due to the inclination of the carriage 61, a height adjustment mechanism is provided on the wheel 60 of the carriage 61. May be installed so that the height can be adjusted before operation with the rope 75.
[0085]
Next Figure 13 (a) and (b) Book A thirteenth embodiment of the invention will be described. This embodiment is the same as the twelfth embodiment in that a guide rail 76 is laid on the floor surface of the pump chamber 40, and a guide rail coupling mechanism 77 for the carriage 61 to travel along the guide rail 76 is used as the carriage 61. It is in that.
[0086]
According to the present embodiment, the carriage 61 with wheels 60 can travel along the guide rail 76 by the guide rail coupling mechanism 77, the accuracy of the position of the carriage 61 to the pump installation position is increased, and the positional deviation is adjusted. The exposure of workers due to such factors can be reduced.
[0087]
Next Figure 14 (a) and (b) Book A fourteenth embodiment of the invention will be described. In this twelfth embodiment, a rail 78 is laid on the floor surface of the pump chamber 40 in the twelfth embodiment, and a rail coupling mechanism 79 for running the rail 78 is provided in the carriage 61. That is, the rail coupling mechanism 79 is attached to the transport carriage 61 of the motor unit 15 that can run on the rail 78 laid on the floor of the pump chamber 40.
[0088]
According to the present embodiment, the carriage 61 can travel along the rail 78, the accuracy of the position of the guidance of the carriage 61 to the installation position of the vertical axis pump 3 is increased, and the exposure of the worker due to misalignment adjustment or the like is increased. Can be reduced. In addition, since the work for guiding the carriage 61 to the installation area of the vertical pump 3 by human power is reduced, it is possible to improve the efficiency of transportation work and reduce the exposure of workers.
[0089]
According to the embodiment of the maintenance device, it is possible to reduce the building volume, reduce exposure during pump maintenance, save work, improve workability, and the like. Costs can be significantly reduced by reducing the volume of the building. In addition, exposure during pump maintenance and labor costs can be reduced by saving labor for reduction work, safety can be improved, and work time can be shortened by improving workability. Can be achieved.
[0090]
【The invention's effect】
According to the invention of the pump facility of the nuclear power plant according to the present invention, the size and volume of the building can be reduced by dividing the arrangement of the pump main body, the valve and the piping. In addition, the floor height of the equipment room or pump room where the vertical axis pump is installed should be minimized and the dimensions of the radioactive fluid piping layout should be minimized to reduce costs by reducing radiation exposure during maintenance work and saving labor. Can do.
[0091]
On the other hand, according to the invention of the maintenance facility, at the time of overhaul inspection of the vertical axis pump in the vertical downward direction, the operation of the vertical axis pump or the carriage carrying these parts is remotely controlled to reduce the work of the worker, It can be done in combination with reduction of exposure, safety, etc.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view schematically showing a part of a first embodiment of a pump facility according to the present invention.
FIG. 2 is a longitudinal sectional view schematically showing a part of a second embodiment of the pump equipment according to the present invention.
FIG. 3 is a longitudinal sectional view schematically showing a part of a third embodiment of pump equipment according to the present invention.
FIG. 4 is a longitudinal sectional view schematically showing a part of a fourth embodiment of the pump equipment according to the present invention.
FIG. 5 is a longitudinal sectional view schematically showing a part of a fifth embodiment of pump equipment according to the present invention.
6A is a plan view schematically showing a part of a sixth embodiment of the pump equipment according to the present invention, and FIG. 6B is a plan view showing a conventional example compared with FIG.
FIG. 7 is a perspective view for schematically explaining in part a seventh embodiment of pump equipment according to the present invention;
FIG. 8 is a perspective view for schematically explaining a part of an eighth embodiment of the pump equipment according to the present invention.
9A is a plan view schematically showing a part of a ninth embodiment of the pump equipment according to the present invention, and FIG. 9B is a perspective view showing a state in which the shielding lid in FIG. Figure.
FIG. 10 is a perspective view showing a first example of the embodiment of the pump maintenance facility according to the present invention.
FIG. 11A is an elevational view showing a partial cross section for illustrating a second example of the embodiment of the pump maintenance facility according to the present invention, and FIG. 11B is an enlarged view of the carriage fixing mechanism in FIG. Elevation view shown.
12A is a plan view showing a third example of the embodiment of the pump maintenance facility according to the present invention, and FIG. 12B is a plan view showing a moving state of the carriage from the state of FIG.
FIG. 13 is a plan view showing a fourth example in the embodiment of the pump maintenance facility according to the present invention, and (b) is an enlarged plan view showing the main part in (a).
14A is a plan view showing a fifth example of the embodiment of the pump maintenance facility according to the present invention, and FIG. 14B is a plan view showing an enlarged main part in FIG. 14A.
FIG. 15 is an elevation view for explaining a maintenance procedure using the pump maintenance facility according to the present invention.
FIG. 16 is a cross-sectional view showing the indoor arrangement of a pump facility of a conventional nuclear power plant.
FIG. 17 is an elevation view for explaining a maintenance procedure of a conventional vertical axis pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Building housing, 2 ... Equipment room with high floor height, 3 ... Vertical axis pump, 4 ... Pump main body, 5 ... Pump casing, 6 ... Pump support, 7 ... Piping, 8 ... Suction valve and discharge valve, 9 ... Stand , 10 ... Worker, 11 ... Dolly, 12 ... Auxiliary equipment, 13 ... Impeller, 14 ... Rotor, 15 ... Motor unit, 16 ... Lifting machine, 17 ... Nut, 18 ... Monorail, 19 ... Motor unit support base, 20 ... Motor casing, 21 ... Rear cover, 22 ... Pump casing bolt, 23 ... Building housing, 24 ... Lower floor equipment room, 25 ... Adjacent room, 26 ... Upstairs room, 27 ... Floor, 28 ... Hatch, 29 ... Maintenance room , 30: Support member, 31 ... Building housing, 32 ... Vertical partition wall, 33 ... Horizontal partition wall, 34 ... Right pump chamber, 35 ... Left pump chamber, 36 ... Curtain rail, 37 ... Shielding curtain, 38 ... Entrance, 39 ... Maintenance area, 40 ... Pump room, 41 ... Shield door, 42 ... Rabi Wall, 43 ... labyrinth passage, 44 ... driving form, 45 ... piping support, 46 ... duct support, 47 ... duct, 48 ... suspension, 49 ... cable tray, 50 ... reinforcement, 51 ... large block (floor Block), 52 ... balance, 53 ... shielding lid, 54 ... hinge, 55 ... support base, 56 ... bolt, 57 ... bolt insertion hole, 58 ... nut, 59 ... frame, 60 ... wheel, 61 ... bogie, 62 ... Supporting wedge, 63 ... Case fixing hole, 64 ... Motor unit fixing member, 65 ... Ring stop, 66 ... Screw hole, 67 ... Dolly fixing mechanism, 68 ... Handle, 69 ... Ball screw, 70 ... Fixing base, 71 ... Base plate , 72 ... bearing, 73 ... hinge arm, 74 ... pulley, 75 ... rope, 76 ... guide rail, 77 ... guide rail coupling mechanism, 78 ... rail, 79 ... rail coupling mechanism.

Claims (4)

Maintenance chamber provided in the lower floor of an equipment room for installing the vertical shaft pump, said longitudinal axis pump lowered installed suspended from the ceiling, comprising setting only a hatch in the floor located below the longitudinal axis pump of the equipment chamber This is a pumping facility for nuclear power plants. The ceiling has a pump body of the vertical axis pump, devices attached to the pump, and other devices attached in advance to a driving form to form an integrated structure, and the integrated structure is directly suspended at a predetermined position on the construction site. 2. The nuclear power plant pumping facility according to claim 1 , wherein the pumping facility is a ceiling of the equipment room . Maintenance chamber provided ordinate pump equipment chamber beneath floor you installation, the pump casing portion of the longitudinal axis pump supported and fixed to the floor of the equipment room, the piping side of the longitudinal axis pump into the equipment chamber arrangement, and pumping equipment for nuclear power plants, characterized by comprising place the said pump body to the maintenance room. The floor has a floor block structure in which a pump body of the vertical axis pump, equipment associated with the pump and other equipment are previously attached to a driving form, and the floor block structure is directly placed at a predetermined position on the construction site. 4. The pumping facility for a nuclear power plant according to claim 3, wherein the pumping facility is used as a floor of the equipment room .

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