JPH07270578A - Acceptance inspection method for new fuel - Google Patents

Abstract

PURPOSE:To enhance the work efficiency while ensuring the safety by transferring a fuel container from a temporary stock yard to a detecting position using a truck equipped with a suspension gantry crane and then standing the fuel rods on an inspection table integrally with each truck. CONSTITUTION:A fuel container carried by means of a carrying work tool is mounted on a truck 41 in front of a container stand 18 and secured in place. It is then hoisted by means of a jib crane 42 fixed to the upper stage of the container stand 18. Subsequently, the fuel container is raised by rolling the wheels 43 of the truck upward along the rail 44 of the container stand 18 and the fuel container is secured before a suspender 17 is removed. Finally, a new fuel O is then hoisted by means an overhead crane and fixed to an inspection table. Dedicated work tools are employed, respectively, in the process for transferring the fuel container from a temporary stock yard to an inspecting position and in the process for standing the new fuel 0 on the container stand 18. Consequently, the work is carried out without operating the overhead crane after transfer of the fuel container before fixing thereof to the container stand 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the appearance, dimensions, etc. for confirming the presence or absence of damage during transportation, for example, before loading a new fuel introduced into a boiling water nuclear power plant into a nuclear reactor. The present invention relates to a so-called "new fuel carry-in inspection work method" which is an inspection.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view for explaining a loading operation of a transport container for containing fresh fuel in a transport state. The new fuel carried into the boiling water nuclear power plant is stored in the transport container (1) and transported to the reactor power plant. This shipping container
(1) consists of a fuel container (5) for sealingly accommodating two new fuels that do not cover the channel box, and a protective container (4) for packing and protecting the fuel container (5).

As shown in FIG. 5, after a transport vehicle (2) loaded with a transport container (1) arrives at a nuclear power plant, it is unloaded at a designated place on the premises of a power plant by a crane vehicle (3). Therefore, the protective container (4) is unpacked, the internal fuel container (5) is taken out, placed on a dedicated truck (6), and carried in from the large-sized cargo inlet (8) of the reactor building (7).

After loading into the reactor building, the fuel container (5)
It is hung by a jig (9) for lifting individual fuel containers and an overhead crane (10) in the reactor building, and temporarily placed in a designated temporary storage location (11) on the top floor. That is, the fuel container (5) is arranged so as to be orthogonal to the pair of sleepers (12) passed in parallel, and the pair of sleepers (12) is further passed in parallel on the fuel container (5). It is temporarily placed so that it can be placed.

FIG. 6 is an explanatory diagram showing a procedure for unpacking a fuel container, and FIGS. 6A to 6D are explanatory diagrams showing individual procedures.
FIG. 7 is an explanatory view showing the storage operation of the new fuel, and is shown in FIGS.
The figure is an explanatory view showing the individual steps.

As shown in FIG. 6a, the fuel container (5) temporarily placed in the temporary placement location (11) is the hook of the overhead crane (10).
It is hung sideways at (13) and transferred to the fuel container unpacking location (14). Next, cover the top (15) and skull (1) of the fuel container (5).
6) and are removed using the overhead crane (10) and unpacking is performed. That is, the skull (16) of the fuel container (5) is displaced and removed, and the overhead crane is attached to both sides of the upper lid (15) via the hooks (13).
Connect to (10) and pull up the overhead crane (10) to remove.

Next, as shown in FIG. 6 (b), the unpacked fuel container (5) is mounted on a vertical hanging jig (17) on two hanging rings provided on both sides of the container (5). ) Is installed and the overhead crane
(10) is pulled up and vertically suspended, and the fuel container (5) is attached to the container stand (18) while leaning against it, as shown in FIG. After installing the fuel container (5), suspend the new fuel (0), take it out from the fuel container (5), and hook the handle (20) on the upper part of the new fuel (0) into the hook (13) as shown in Fig. D. Attach it to the inspection table (19) while suspending it via.

After mounting on this inspection table (19), fresh fuel (0)
The work is done in the order of taking out the fuel and inspecting the new fuel (0).
The new fuel (0) mounted on the inspection table (19) is inspected for appearance and dimensions.

After the inspection is completed, a channel box (21) is mounted by a manual winch (not shown) attached to the inspection table, as shown in FIG. Furthermore, as shown in Fig. F, new fuel with channel box
(0a) is hung by an overhead crane (10) and transferred, and is attached to the fuel storage unit (23) of the spent fuel storage pool (22) and stored in the pool (22) as shown in FIG. When the new fuel with channel box (0a) is not stored in the spent fuel storage pool (22), it is stored in a new fuel storage rack (not shown).

Finally, empty the fuel container (5) with the overhead crane (1
Suspend at 0), attach the lid, and place it in the designated place of the original temporary storage area (11).

The above work is called a new fuel carry-in inspection work. FIG. 8 is an explanatory view showing a time schedule of the conventional new fuel carry-in inspection work. In the figure, the black squares in each process show the operation of the overhead crane, and the shaded squares show the operation of the manual winch attached to the fuel inspection table. The width of each square is the time (minutes) related to the work.
Indicates.

As shown in the figure, the overhead crane (10) does not rest, (a) fuel container movement, (b) fuel container unpacking, (c) fuel container vertical suspension movement, (d) fuel container stand attachment, ( e) New fuel transfer, (f) New fuel inspection, (g) Channel box installation,
The processes of (h) moving new fuel with channel box (C / B), (i) vertically moving empty fuel container, and (j) moving empty fuel lid are operating almost continuously.

[0013]

As described above, the crane operator is considerably tired due to continuous tension. Should trouble occur due to incorrect operation, social impact will be great. On the other hand, recently, other inspection work etc. inside the reactor building has increased, and the construction period required for the new fuel loading inspection work cannot be sufficiently secured, and it tends to be shortened. On the other hand, the working hours of workers engaged in radiation handling work are regulated to a maximum of 10 hours per day.

In order to increase the number of new fuel inspections per day under such restrictions, it is possible to increase the speed of the overhead crane (10), but as mentioned above, safety work is required. It is not preferable from the viewpoint of securing. The number of new fuel inspections per day is not constant because the specifications of each nuclear power plant are different, but currently it is about 16 to 24 units / day.

During this time, the overhead crane 10 is continuously operated without any breaks, and the crane operator is tired due to continuous tension. This is because if a trouble should occur due to an erroneous operation, the social impact will be great. Further, recently, other inspection work and the like inside the reactor building has increased, and the construction period required for the new fuel carry-in inspection work cannot be sufficiently taken, and it tends to be shortened.

Under such circumstances, it is an object of the present invention to obtain a new fuel carry-in inspection work method for ensuring the safety work of the new fuel carry-in inspection work and achieving the efficiency of the work.

[0017]

In the new fuel carry-in inspection work method according to the invention described in claim 1, a fuel container containing new fuel loaded in a temporary storage location in the reactor building is also used in the reactor building. New fuel carry-in inspection work of transporting the new fuel from the fuel container to the inspection stand, mounting it on the inspection stand in an upright state, inspecting the new fuel, and mounting a channel box on the new fuel. In the method, the transportation of the fuel container loaded in the temporary storage location to the inspection location,
Carrying on a trolley-equipped trolley that suspends the fuel container containing the new fuel, transfer the new fuel taken out at the inspection place to another trolley, and install the new fuel upright on the inspection base separately from the above. This is done for each carriage.

[0018]

In the present invention, the fuel container loaded in the temporary storage location is transported to the inspection location by the carriage with the gate type crane that suspends the fuel container containing the new fuel, and is taken out at the inspection location. Since the new fuel is transferred to another trolley, and the new fuel is erected on the inspection table upright for each of the other trolleys, the overhead crane installed in the reactor building must be at least the inspection location. There is no need to transport the new fuel to the inspection table and to set up new fuel on the inspection table, which reduces the burden on the crane operator's operation. Therefore, it is possible to secure the safe work and achieve the work efficiency.

By the way, the temporary storage location and the inspection location are not generally separated from each other, but on the same floor. Therefore, instead of transporting the fuel container with a conventional overhead crane, the carrier with a gate-type crane that transports the fuel container loaded in the temporary storage location to the inspection location lifts the fuel container and lifts the fuel container. Is to be transported.

That is, specifically, a gate type provided with a traction means for pulling the fuel container upward in a sideways state and a carriage for laterally transferring the traction means and the fuel container pulled upward. Carry with a crane. The dolly-mounted trolley has a simple structure, work tools can be manufactured at low cost, and operation is simple.

The drive source of the traction means may be human power such as an operator hoisting a winch, or mechanical power such as an electric motor. Further, the trolley may be transferred manually by an operator, or may be configured to be transferred by a mechanical force such as another electric motor. When mechanical force is used, the operation panel may be attached to the work tool or may be remotely operated.

Further, the new fuel taken out at the inspection place is transferred to another trolley, and the new fuel is erected on the inspection pedestal together with the other trolley. A trolley for supporting the trolley in a sideways state, an erection stand for holding the trolley supporting the fuel container in an erected state, and a traction means for pulling one end of the trolley installed on the erection platform upward. A rail for mounting one wheel of the carriage provided on a side surface of the upright table, one end of the carriage being pulled, one wheel being placed on the rail, and being lifted without leaving the rail, There is a thing to make each stand stand.

The new fuel taken out at this inspection place is transferred to another trolley, and the new fuel is erected and mounted on the inspection base for each of the other trolleys. It is inexpensive to create and simple to operate.

Similarly, as the drive source of the traction means,
It may be manually operated by a worker to wind up a winch, or may be mechanically operated by an electric motor or the like. When mechanical force is used, the operation panel may be attached to the work implement or may be remotely operated.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing a time schedule of a new fuel carry-in inspection work of the present invention. FIG. 2 is an explanatory view showing the configuration of an embodiment of a work tool used in the method of the present invention.
FIG. 3 is an explanatory view showing the use of the work implement of FIG. 4A and 4B are explanatory views showing the structure of an embodiment of another working tool used in the method of the present invention. FIG. 4A is a top view, FIG. 4B is a plan view, and FIG. 4C is a side view. In the drawings, the same reference numerals as those in the conventional example indicate the same or corresponding portions.

In FIG. 1, the white squares in each step show the operation of the work implement used in the method of the present invention, the black squares show the operation of the overhead crane, and the shaded squares are attached to the fuel inspection table. The operation of the manual winch is shown. The width of each square indicates the time (minutes) involved in the work.

In the present invention, as shown in FIG.
The process of transporting the fuel container (5) loaded in (11) to the inspection place and the process of standing the new fuel on the container stand (standing table) are performed by dedicated work tools.

That is, the overhead crane (10) does not participate in these two steps, and the fuel container (5) is attached to the container stand (18).
The process of vertically suspending the new fuel (0) installed together with it and moving it to the inspection table (19), and the appearance and dimension inspections were performed, and the installed new fuel (0a) with a channel box was transferred. The process of attaching the spent fuel storage pool (22) to the fuel storage unit (23) and storing it in the pool (22) or storing it in a new fuel storage rack is performed.

Therefore, the burden on the crane operator for driving is lightened, safe work can be secured, and work efficiency can be improved.

The operations of suspending, moving, unpacking and moving the fuel containers (5) loaded in the temporary storage location (11) to the container stand (18) are performed by the transfer work tools (30) shown in FIG. ). This transfer work tool (30) has wheels (31) whose direction of rotation can change freely.
It has a gate-like appearance in which four columns (32) to which are mounted are assembled with each other by girders (33). The length and width in the longitudinal direction have a larger appearance than the length and width of the fuel container. still,
It can be used if one of the length or width in the longitudinal direction is larger than the fuel container, but the larger one is stable when lifted.

At the central position of the transfer work tool (30), the pulley (34)
The pulley (34) has a wire (36) extending from a winch (35) for suspending the fuel container (5) on one of the columns (32). By winding up this winch (35),
Hook the four hanging rings on the side of the fuel container (5) and hang it upside down.

The worker moves the transfer work tool (30) by hand to the fuel container temporary storage place (11) shown in FIG.
Transport work tool in which the winch (13) is rolled up to lift the fuel container (5), and the fuel container (5) is also lifted by pushing it by hand.
Press (30) to move to the inspection location near the container stand (18). Compared with the conventional overhead crane, the transfer work of the transfer work tool can be performed near the fuel container (5), so the operation time can be reduced to about half.

Further, as shown in FIG. 3, if the fuel container (5) is moved to the container stand (18), the truck (41) is moved.
Then, remove the upper lid (15) and skull (16) of the fuel container (5) and unpack the fuel container (5). Next, the unpacked fuel container
Since (5) is erected, the vertical suspension jig (17) shown in FIG. 4 is attached to the two suspension rings (34) provided on the side surface on one end side of the carriage (41).

As shown in FIG. 4, in the container stand (18), the one in which the fuel container (5) was vertically suspended by the overhead crane (10) is used instead of the overhead crane (10).
It has the function of vertically hanging (5) and leaning it against the container stand (18).

That is, the fuel container (5) moved by the transfer work tool (30) is placed and fixed on the carriage (41) in front of the container stand (18). Next, hoist it with the jib crane (42) attached to the upper stage of the container stand (18), and then move the wheels (43) of the truck (41) along the rails (rail) (44) of the container stand (18) to the fuel container (5). Raise up.

After standing upright, the fuel container (5) is fixed to the container stand (18) and the vertical hanging jig (17) is removed. After that, the new fuel (0) is lifted by the overhead crane (10) and attached to the inspection table (19) shown in FIG. 6 described above.

As described above, the step of transporting the fuel container loaded in the temporary storage location to the inspection location and the step of erection of the new fuel on the container stand (standing table) should be carried out by dedicated work tools. This allows the work to proceed from moving the fuel container (5) to mounting it on the container stand (18) without applying an overhead crane.

Comparing the time schedule of this embodiment shown in FIG. 1 with the conventional time schedule shown in FIG. 8, (1) Regarding work efficiency, in the conventional method, the new fuel inspection quantity is from A to H, Eight, new fuel inspection quantity is A to N in this method
Up to 14, the work efficiency is improved by 75%. (2) Crane operating status In the conventional method, the crane operating time is 180 minutes continuous operation. In this method, the crane operating time is 70 minutes operating.

As described above, as shown in the time schedule of FIG. 1, the operating condition of the overhead crane is as shown in FIG.
As you can see from the comparison, it is significantly reduced. At the same time, work efficiency can be improved and a great effect can be obtained. Conventionally, it was impossible to move the new fuel (0) and the fuel container (5) at the same time due to the constraint of the crane operation, but by adopting this method, the moving work can proceed at the same time. Therefore, the work efficiency can be improved. Also, the crane operator need only concentrate on the movement of fresh fuel (0) and fresh fuel with channel box (9),
Fatigue is greatly reduced.

[0040]

As described above, according to the present invention, the transportation of the fuel container loaded in the temporary storage location to the inspection location is performed by the carriage with the gate type crane for suspending the fuel container containing the new fuel, Since the new fuel taken out at the inspection place is transferred to another trolley, and the new fuel is erected on the inspection pedestal together with the other trolley, an overhead crane installed in the reactor building Eliminates the need to carry at least to the inspection place and to set up new fuel on the inspection table, which reduces the burden on the crane operator's operation. Therefore, there is an effect that it is possible to secure the safe work and achieve the work efficiency.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a time schedule of a new fuel carry-in inspection work of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an embodiment of a work tool used in the method of the present invention.

FIG. 3 is an explanatory view showing the use of the work implement of FIG. 2.

4A and 4B are explanatory views showing the configuration of an embodiment of another working tool used in the method of the present invention, wherein FIG. 4A is a top view, FIG. 4B is a plan view, and FIG. 4C is a side view.

FIG. 5 is an explanatory diagram for explaining a carrying-in operation of a carrier container that accommodates fresh fuel in a carrier state.

FIG. 6 is an explanatory diagram showing a procedure for unpacking a fuel container.

FIG. 7 is an explanatory diagram showing a storage operation of new fuel.

FIG. 8 is an explanatory diagram showing a time schedule of a conventional new fuel carry-in inspection work.

Claims (1)

[Claims] 1. A fuel container containing new fuel loaded in a temporary storage location in the reactor building is also transported to an inspection location in the reactor building, and new fuel inside is taken out from the fuel container and set up on an inspection table. Installed in the installed state, inspecting the new fuel and at the same time, in the new fuel carry-in inspection work method of mounting the channel box on the new fuel, transporting the fuel container loaded in the temporary storage location to the inspection location, Carrying with a carriage with a gate crane that suspends the fuel container containing the new fuel, transfer the new fuel taken out at the inspection place to another carriage,
A new fuel carry-in inspection work method characterized in that the new fuel is vertically installed on the inspection table together with the other carriage.