JP2723336B2 - Maintenance area of the concentrator room - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention is to heat a radioactive waste liquid generated in a nuclear power plant by steam or the like, and to collect concentrated grassland that separates into distilled water and sludge. Pertaining to the maintenance area of the concentrator room.

(Prior Art) FIG. 5 is a plan view of a conventional concentrator chamber, FIG. 6 is a plan view of a conventional maintenance area provided above the concentrator chamber, and FIG. It is sectional drawing of a maintenance area. In FIG. 5, a heater 2, a demister 3, an evaporator 4, a circulation pump (not shown) and the like are accommodated in a concrete building frame 1.

In FIG. 6, the maintenance area 5 is disposed above the heater 2, the demister 3, and the evaporator 4 shown in FIG. 5, and the floor thereof is made of concrete having a high radiation shielding property. The concrete hatch 6 for maintenance and carrying in / out the heater 2, the demister 3, the evaporator 4, etc. is placed on the floor.
Are provided respectively. Further, a decontamination pan 7 used when decontaminating the carried-out equipment is provided on the floor.

FIG. 7 is a sectional view of the concentrating apparatus room and the maintenance area, and the same parts as those in each of the above-mentioned figures are denoted by the same reference numerals. In this figure, a monorail 8 for moving the various devices, concrete hatch 6 and the like is provided on the ceiling of the maintenance area 5 (the monorail 8 is also shown in FIG. 6 for convenience). In a normal inspection, the concrete hatch 6 is opened, and the demister 3 and the lid of the heater 2 are removed to perform maintenance. During the above maintenance work, decontamination of the mesh pad in the demister 3 is the main work.

In addition, it is not necessary to carry out the entire equipment from the concentrator room at the time of the normal inspection. If the reliability of the equipment deteriorates due to the corrosion of the equipment, the equipment must be replaced.
It is considered to be about 0 to 1 time during the year.

(Problems to be Solved by the Invention) In the conventional maintenance area having the above configuration, it is necessary to lift, hang down, and move the heavy-weight concrete hatch 6 for equipment maintenance, which is dangerous. . In addition, the work must be performed with the concrete hatch opened, and the work around the opening is dangerous. Further, the equipment constituting the concentrator has a considerable height in terms of its function, and the ceiling height of the momentum concentrator room is increased. Moreover, as described above, since the maintenance area having the ceiling height necessary for replacing the equipment once or not during the life of the plant is provided, the floor height of the entire building including the concentrating apparatus room is significantly increased.

The present invention has been made based on the above circumstances, it is possible to perform maintenance of the components of the concentrator without opening and closing, moving heavy objects such as concrete hatches,
It is an object of the present invention to provide a concentrating apparatus room in which the entire building that houses the concentrating apparatus has a floor height as small as possible.

[Constitution of the Invention] (Means for Solving the Problems) The maintenance area of the concentrating device room of the present invention is provided in the concentrating device room in which the equipment constituting the concentrating device is arranged, and penetrates the evaporator and the upper end of the demister. The maintenance area floor has a removable floor surface.

(Operation) In the maintenance area of the concentrating apparatus room of the present invention having the above configuration, the upper part of the evaporator and the demister, which are the main inspection targets in the normal inspection, protrude from the detachable maintenance area floor surface. Maintenance can be performed simply by removing the lid. Furthermore, since the maintenance area floor is a detachable floor, even if the floor height of the maintenance area is small, the device can be replaced by removing the detachable floor.

(Embodiment) The same parts as those shown in FIGS.
FIG. 2 is a plan view of one embodiment of the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a view showing a mode of carrying in and out of a concentration apparatus component device (a heater is illustrated) in the embodiment. FIG. 1,
In FIG. 2, the floor height of the maintenance area 5 is smaller than the axial length of each device constituting the concentrator. The detachable floor 9 of the section containing the evaporator 4 and the demister 3 can be removed as needed. Further, the upper ends of the evaporator 4 and the demister 3 project from the detachable floor 9.

The concrete hatch 6 is provided on a fixed floor 10 provided at one side of the building at substantially the same level as the detachable floor 9, and is provided in a section where the demister 3, the evaporator 4, and the heater 2 are accommodated. It has a width substantially equal to the width. Furthermore, the monorail 8 is the building frame 1 of the concrete hatch 6.
With the end on the side as a starting point, it ends just above the heater 2, just above the evaporator 4, and just above the demister 3, and ends above the decontamination pan 7.

In the concentrating apparatus room of the present invention having the above structure, the upper ends of the demister 3 and the evaporator 4 which are the main objects at the time of the periodic inspection project from the detachable floor 9 so that the concrete hatch 6 can be inspected without opening. Etc. can be implemented.
The attachment and detachment and transfer of the lids of these devices are performed by a crane (not shown) mounted on the monorail 8. The component parts of each device, for example, the mesh pad of the demister 3 are decontaminated as follows. That is, the lid removed by the crane is placed near the concrete hatch 6 and the mesh pad is transported to the decontamination pan 7 where the decontamination is performed.

As described above, in the maintenance area of the concentrating apparatus room of the present invention, in the inspection of the demister 3 and the evaporator 4 which need to be inspected at regular inspections, the concrete hatch 6 is required.
Since it is not necessary to open the door, the danger associated with handling during weight can be avoided.

If the device needs to be replaced due to equipment failure, the third
Replace as shown. FIG. 3 sequentially shows the movement of the heater 2 when the heater 2 is replaced. For replacement, the demister 3 and the evaporator 4 are first removed, and then the removable floor 9 is removed. In this state, the concrete hatch 6 is opened by using a crane capable of traveling on the monorail 8, the heater 2 is removed, and the heater 2 is lifted through the opening 40 in which the evaporator 4 is attached (illustrated 2 a). here,
The heater 2 is lifted diagonally upward by moving and lifting the crane (2b, 2c in the figure). When the heater 2 has been lifted sufficiently diagonally upward, the lower end thereof is lifted and moved in the horizontal direction, and the heater 2 is set to the horizontal position (2e in the drawing) via the state shown in FIG. And temporarily stored under the fixed floor 10 having the concrete hatch 6 opened or taken out of the maintenance area 5.

The new heater is carried in from outside the maintenance area, and is installed at the installation position of the heater in the reverse order.

Further, other devices are attached and the detachable floor 9 is attached, and the replacement of the heater is completed.

As described above, in the maintenance area of the concentrating apparatus room of the present invention, since a part of the floor surface of the maintenance area 5 is detachable, the floor height is smaller than the axial length of the equipment to be replaced in the maintenance area. It is possible to exchange equipment.

FIG. 4 is a plan view of another embodiment of the present invention. In this embodiment, the number of decontamination pans 7 is one, and the monorail 8 is also one system. Needless to say, the same operation and effect as those of the above embodiment can be obtained. However, in this embodiment, since only one set of the decontamination pan 7 and the unillustrated crane is required, the cost can be reduced accordingly.

[Effects of the Invention] As is clear from the above, in the maintenance area of the present invention, normal maintenance for the evaporator and the demister can be performed without removing the heavy concrete hatch. There is no danger associated with handling. Also, it is not necessary to perform dangerous work around the opening from which the concrete hatch has been removed. further,
Since the bottom through which the evaporator and the demister are penetrated is removable, even if the floor height of the maintenance area is smaller than the axial length of the device to be replaced, it is possible to replace the device by removing the removable bottom and concentrate. The height of the equipment room building can be made as small as possible.

[Brief description of the drawings]

1 is a plan view of one embodiment of the present invention, FIG. 2 is a cross-sectional view of the embodiment, FIG. 3 is a diagram showing a mode of carrying in and out of components (constituting a heater, for example) of a concentrator in the embodiment, FIG. 4 is a plan view of another embodiment of the present invention, FIG. 5 is a plan view of a conventional concentrator chamber, FIG. 6 is a plan view of a conventional maintenance area provided above the concentrator chamber, FIG. FIG. 7 is a cross-sectional view of the conventional concentrator room and maintenance area. 1 ... building frame, 2 ... heater, 3 ... demister, 4 ...
... Evaporation can, 5 ... Maintenance area, 6 ... Concrete hatch, 7 ... Decontamination pan, 8 ... Mono rail, 9 ...
... Removable floor, 10 ... Fixed floor

Claims (1)

(57) [Claims] 1. A concentrating device provided in a concentrating device room in which equipment constituting a concentrating device is disposed, wherein a maintenance surface floor through which an evaporator and an upper end of a demister penetrate is a detachable floor surface. Room maintenance area.