JP2022130951A - Underwater transport system and underwater transport method - Google Patents

Abstract

To provide an underwater transport system capable of transporting activated core internals stored underwater in a dryer separator pool inside a reactor building to a predetermined place underwater without using any lifting equipment such as an overhead crane that requires coordination with other work or waiting time.SOLUTION: A disclosed underwater transport system transports activated core internals stored in a dryer separator pool that communicates with the reactor well pool via water filled by using buoyancy to a reactor well pool via a water-filled connection part between the reactor well pool and the dryer separator pool.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an underwater transportation apparatus and an underwater transportation method, and in particular, an activated reactor internal structure stored underwater in a dryer separator (hereinafter referred to as DS) pool in a nuclear power plant is transferred to a predetermined location. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater transportation apparatus and an underwater transportation method suitable for transportation in water.

In a nuclear power plant, during periodic inspections, activated internal reactor structures such as separators (steam separators) and dryers (steam dryers) are found in the water in the DS pool inside the reactor building. After the periodical inspection is completed, the separator, dryer, etc. are returned to the predetermined positions in the furnace and the furnace is operated again.

A lifting machine such as a ceiling lane is used to transport the activated reactor internals such as separators and dryers from the DS pool to the reactor well.

Patent documents 1, 2, and 3, for example, can be cited as prior art documents of underwater transport devices in nuclear power plants.

In the above-mentioned Patent Document 1, in order to shorten the work time for transporting the transported object in the reactor and to protect the transported object during transportation, the transported object is transported by swimming in the reactor water of the nuclear reactor. The submersible transport system includes a buoyancy adjustment unit that can adjust the buoyancy in the reactor water, an underwater moving unit that generates hydraulic power in the vertical and horizontal directions of the reactor and can rotate around the vertical axis, and a transported object. and a protection ring that protects the conveyed article while it is being grasped.

In addition, in the above-mentioned Patent Document 2, a moving device in a water-filled device capable of precise movement control and positioning is equipped with a camera and work equipment for monitoring the inside of the water-filled device. a constricted space moving device capable of moving within the apparatus by means of a propulsion mechanism or wheels; an internal space having an opening for entering and exiting the narrow space moving device; A support device that accommodates the device so that it can be moved in and out and performs a support operation for the narrow space moving device, has an underwater movement means, and is provided with a support device that can move in the nuclear reactor by the underwater movement means. An underwater confined space moving system is described in which the support device is sometimes released from the holding by the holding means, and the constricted space moving device emits light through the opening.

Furthermore, in the above-mentioned Patent Document 3, in order to obtain an underwater moving repair inspection apparatus that can reliably prevent vertical displacement of an underwater vehicle that moves freely in water such as in a nuclear reactor, It has a buoyancy generating device that generates buoyancy, a device for swimming and wall adsorption, and an underwater vehicle provided with at least one traveling wheel. It is described that a guide roller is provided to contact the lower surface of the target structure.

Japanese Unexamined Patent Application Publication No. 2013-3073 Japanese Patent Application Laid-Open No. 2003-40194 JP 2007-212393 A

However, the underwater transfer apparatus described in the above-mentioned Patent Document 1 performs transfer work such as moving objects such as fuel and control rods installed underwater in a nuclear power plant and installing them in other places. In addition, the underwater transfer apparatus described in Patent Documents 2 and 3 performs inspection, inspection, preventive maintenance and repair of the reactor internal structure of the nuclear reactor filled with water. , intended to transport activated reactor internal structures such as separators and dryers stored underwater in the DS pool in the reactor building to a predetermined location (e.g., reactor well) underwater. It is not what you have.

Therefore, in Patent Documents 1, 2 and 3, activated reactor internal structures such as separators and dryers stored in water in the DS pool in the reactor building are transported underwater to a predetermined location. There is no such idea.

For this reason, when transporting activated reactor internal structures such as separators and dryers stored underwater in the DS pool in the reactor building to a predetermined location underwater, It is desirable to transport activated reactor internal structures such as separators and dryers in water without using overhead lanes or other lifting equipment that requires time adjustment and waiting time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to move the activated reactor internals stored underwater in the DS pool in the reactor building to another place. To provide an underwater conveying apparatus and an underwater conveying method capable of conveying underwater without using a lifting machine such as an overhead crane which causes adjustment with work and waiting time.

In order to achieve the above object, the underwater transfer apparatus of the present invention carries activated reactor internals stored in a DS pool filled with water and communicating with a reactor well pool as described above. It is characterized by being conveyed into the reactor well pool using buoyancy through a water-filled communication portion between the reactor well pool and the DS pool.

Specifically, the underwater transport apparatus of the present invention includes a buoyancy adjusting section for adjusting buoyancy by taking gas in and out of water, a holding section for holding activated core internals, and the and an adjustment mechanism for adjusting the balance in the horizontal direction in order to prevent overturning when holding the activated core internals.

In addition, in order to achieve the above object, the underwater transportation method of the present invention transports the activated core internals stored in the DS pool which is filled with water and communicates with the pool of the reactor well. and the reactor well pool and the DS pool are conveyed into the reactor well pool by means of buoyancy through a water-filled communication section by an underwater conveyor.

According to the present invention, the activated reactor internal structure stored in the water in the DS pool in the reactor building is moved to a predetermined place by an overhead crane or the like that causes coordination with other work and waiting time. It can be transported underwater without using a lifting machine.

At the time of regular inspection of a typical boiling water reactor, the state in which activated internal reactor structures such as separators and dryers are temporarily placed in the DS pool from the reactor pressure vessel through the reactor well pool. It is a front view showing. FIG. 2 is a plan view of FIG. 1; 1 is a cross-sectional view showing a first embodiment of an underwater transfer apparatus of the present invention, showing an example in which the underwater transfer machine covers and holds a dryer, which is an activated reactor internal structure. FIG. 1 is a cross-sectional view showing Example 1 of an underwater transfer apparatus of the present invention, showing an example in which an activated reactor internal structure dryer is sandwiched and held by two underwater transfer apparatuses. FIG. FIG. 4 is a front view showing an example of a holding portion that constitutes the underwater transport device of the present invention; FIG. 6 is a plan view of FIG. 5; FIG. 2 is a perspective view showing an outer shape of an example of an adjusting mechanism for adjusting the balance in the horizontal direction, which constitutes the underwater transport device of the present invention; FIG. 2 is a perspective view showing the internal structure of an example of an adjustment mechanism for adjusting horizontal balance that constitutes the underwater transport device of the present invention. FIG. 4 is a front view showing another example of a holding portion that constitutes the underwater transport device of the present invention; FIG. 10 is a plan view of FIG. 9; 9 and 10 show the details of the holding part, (a) shows the state before the dryer and separator are suspended by the hoist, and (b) is the state where the dryer and separator are suspended by the hoist. 4A and 4B are diagrams showing each; FIG. 10 is a diagram showing an example of transporting a separator installed in water having a similar depth to that of the separator from the DS pool to the pool of the reactor well during periodic inspection of a general boiling water reactor. FIG. 10 is a flow diagram showing an example of transporting a separator or a dryer from a DS pool to a pool of a reactor well using the underwater transport device of the present invention, and a flow chart in the case of suspending the separator or the dryer with a lifting tool. FIG. 10 is a flow diagram showing a front view and a plan view of an example using a winch when a dryer is transported from a DS pool to a reactor well pool using the underwater transport device of the present invention. FIG. 4 is a flow diagram showing an example of using a long balance when transporting a structure from a DS pool to a reactor well pool using the underwater transport apparatus of the present invention. FIG. 4 is a flow diagram for explaining the procedure for adjusting the left-right and front-rear balances of the underwater transport device of the present invention;

Below, the underwater transfer apparatus and the underwater transfer method of the present invention will be described based on the illustrated embodiments. In addition, in each figure, the same code|symbol is used for the same component. Moreover, the following are merely examples of implementation, and are not intended to limit the content of the invention to the following specific embodiments.

In Figures 1 and 2, during periodic inspections of a typical boiling water reactor, the activated internal reactor structures such as the separator (steam separator) and dryer (steam dryer) are placed in the reactor pressure vessel. 1 is a front view, and FIG. 2 is a plan view of FIG. 1. FIG.

A nuclear power plant usually comprises a nuclear reactor and a reactor containment vessel 2 . The reactor containment vessel 2 is installed in the reactor building 1, and is sealed with an upper cover attached to the upper end thereof. It has a pressure suppression chamber formed therein.

The nuclear reactor includes a reactor pressure vessel 3 having a reactor pressure vessel upper lid attached thereto, a reactor core loaded with a plurality of fuel assemblies containing nuclear fuel material, a separator 5, a dryer 6, and the like. . The core, separators 5 and dryers 6 are arranged in a reactor pressure vessel 3 .

Each fuel assembly loaded in the core is supported at its lower end by a core support plate and held at its upper end by an upper lattice plate. Arranged above, the dryer 6 is arranged above the separator 5 .

In the reactor building 1, a DS pool 4 and a spent fuel pool (SFP) 8 for storing spent fuel are provided so as to sandwich the reactor well 7. The DS pool 4 is It is used as a temporary storage place (storage place) for reactor internal structures such as the separator 5 and the dryer 6 .

1 and 2, 9A is an overhead crane and 9B is a fuel handling machine.

As shown in FIGS. 1 and 2, the DS pool 4, the reactor well 7, and the spent fuel pool (SFP) 8 are filled with water. is satisfied and communicated.

As shown in FIG. 2, the communicating portion A between the DS pool 4 and the reactor well 7 is wide enough to allow the separator 5 and the dryer 6 to move underwater.

The underwater transport apparatus of this embodiment transports separators 5 or dryers 6, which are activated reactor internal structures stored in a DS pool 4 filled with water and communicating with a reactor well 7, to the reactor. It is characterized in that it is conveyed into the reactor well 7 through the water-filled communication portion A between the well 7 and the DS pool 4 using buoyancy.

As shown in FIG. 3, the underwater transfer apparatus 10A of this embodiment is held so as to cover the dryer 6 (or the separator 5), which is the activated reactor internal structure, and is transferred, or as shown in FIG. As shown, the dryer 6 (or the separator 5) is held and transported between two underwater transport devices 10A1 and 10A2.

The underwater transport devices 10A, 10A1, and 10A2 of the present embodiment described above include a buoyancy adjusting section for adjusting buoyancy by taking gas in and out of water, a holding section for holding the dryer 6 (or the separator 5), and this holding section. In order to prevent the dryer 6 (or the separator 5) from overturning when it is held, an adjusting mechanism for adjusting the balance in the horizontal direction is provided.

Further, as shown in FIGS. 3, 4, 5 and 6, the above-mentioned dryer 6 (or separator 5) has a plurality of (four in this embodiment) lifting rods 15 each having a hole formed in its upper portion. is provided, and the holding part of the example shown in FIGS. By injecting air from the air hose 19 and pushing out the rod pin 17 , the rod pin 17 fits into a hole formed in the upper part of the lifting rod 15 to hold the dryer 6 (or the separator 5 ).

5 and 6, 20a, 20b, 20c and 20d are fall prevention brackets, 21a and 21b are lifting eyes, 22a and 22c are upper connection bars, and 22b and 22d (not shown) are lower connection bars. is.

3 has L-shaped rods 12a and 12b whose L-shaped portions are rotatable and vertically slidable. The L-shaped rods 12a and 12b are arranged, and by rotating the L-shaped rods 12a and 12b, the tip of the L-shaped portion is installed under the dryer 6 (or the separator 5), and the underwater transport device 10A is installed as it is. By rising due to buoyancy, the L-shaped portions of the L-shaped rods 12a and 12b lift and hold the dryer 6 (or the separator 5).

Although not shown, the holding portions of the underwater transfer devices 10A1 and 10A2 shown in FIG. 4 have the same configuration as the holding portion of the underwater transfer device 10A shown in FIG. 3 described above.

In addition, the buoyancy adjusting section of the underwater transport device 10A shown in FIG. , air enters the container 11 and water is pushed out from the lower opening of the container 11 to adjust the buoyancy.

Further, the underwater transport apparatus 10A shown in FIG. 3 has an adjustment mechanism composed of a weight 14 for finely adjusting the front-rear and left-right balance. The underwater transport apparatus 10A shown in FIG. 3 is well-balanced, so it is sufficient to adjust only the vertical direction. 10A can be balanced.

Although the buoyancy adjusting units of the underwater transport devices 10A1 and 10A2 shown in FIG. 4 are not particularly illustrated, they have the same configuration as the buoyancy adjusting unit of the underwater transport device 10A shown in FIG. 3 described above.

Further, the underwater transport devices 10A1 and 10A2 shown in FIG. 4 may be provided with weights 14 for finely adjusting the front-rear and left-right balance, similarly to the underwater transport device 10A shown in FIG.

Next, the adjustment mechanisms for adjusting the horizontal balance in the underwater transport devices 10A1 and 10A2 shown in FIGS. The anti-overturn brackets 20a, 20b, 20c and 20d are provided, and wires (not shown) are passed through the anti-overturn brackets 20a, 20b, 20c and 20d, and by pulling or loosening the wires from the outside, underwater transportation is possible. The balance of devices 10A1 and 10A2 can be adjusted.

7 and 8 show another example of the adjusting mechanism for adjusting the horizontal balance of the underwater transport devices 10A1 and 10A2.

FIG. 7 is a perspective view showing an outer shape of an example of an adjustment mechanism for adjusting the horizontal balance constituting the underwater transport devices 10A1 and 10A2 of this embodiment, and FIG. 8 shows the underwater transport devices 10A1 and 10A2 of this embodiment. FIG. 4 is a perspective view showing the internal structure of an example of an adjusting mechanism for adjusting the balance in the horizontal direction.

The adjustment mechanism for adjusting the horizontal balance in the underwater transport devices 10A1 and 10A2 of this embodiment includes a plurality of buoyancy adjustment plates (partition plates) 16a (two front and rear buoyancy adjustment plates 16a1 and two left and right buoyancy adjustment plates). A plurality of small rooms (first small room 11a, second small room 11b, third small room 11c and fourth small room 11d) partitioned by plates 16a2), first small room 11a, From the first hose 13a, the second hose 13b, the third hose 13c and the fourth hose 13d connected to the second small room 11b, the third small room 11c and the fourth small room 11d respectively The amount of air injected from the first hose 13a, the second hose 13b, the third hose 13c and the fourth hose 13d is controlled by the first small room 11a, the second small room 11b and the third hose. By adjusting each of the first small room 11c and the fourth small room 11d, the balance of the underwater transport devices 10A1 and 10A2 can be adjusted.

That is, when balancing the front and rear of the underwater transport devices 10A1 and 10A2, the air adjustment amounts of the second small room 11b and the fourth small room 11d and the first small room 11a and the third small room 11c When adjusting by changing the balance and balancing the left and right of the underwater transport devices 10A1 and 10A2, the first small room 11a and the second small room 11b and the third small room 11c and the fourth small room It is adjusted by changing the balance of the air adjustment amount of 11d.

As a result, the underwater transport devices 10A1 and 10A2 can be prevented from overturning.

Next, another example of the holding portion constituting the underwater transport devices 10A1 and 10A2 of the present invention will be described with reference to FIGS. 9, 10 and 11. FIG. FIG. 9 is a front view of the holding parts constituting the underwater transport devices 10A1 and 10A2, FIG. 10 is a plan view of FIG. 9, and FIG. 11(a) shows the state before the dryer or the separator is hung by the hanger 30, and FIG. 11(b) shows the state where the dryer or the separator is hung by the hanger 30. FIG. .

9, 10, and 11, the hoisting device 30 that constitutes the holding portion is a hoisting machine 30a. A chain or wire 30d to be hung, a first member 30b on which a hoisting machine 30a is installed, and a chain or wire 30d installed at the tip of the hoisting machine 30a. It comprises a second member 30c, a rod pin 30e installed below the second member 30c, and an air cylinder 30f having an air hose 19 for operating the rod pin 30e.

Then, by injecting air into the air cylinder 30f from the air hose 19 and pushing out the rod pin 30e, the rod pin 30e is engaged with the hole formed in the upper part of the lifting rod 15 to hold the dryer 6 (or the separator 5) ( FIG. 11(a) state), in this state, the dryer 6 (or the separator 5) is lifted and lowered along with the lifting and lowering operations by the hoisting machine 30a (state of FIG. 11(b)). ).

Note that the front-rear and left-right balance adjustment of the underwater transport devices 10A1 and 10A2 can be performed by using the same means as those shown in FIGS. 4, 5, 6, 7 and 8 described above.

Next, using the underwater transport devices 10A1 and 10A2 of the present embodiment, the separator 5 installed in water having a depth similar to that of the separator 5 is placed in the DS pool during periodic inspection of a typical boiling water reactor. An example of transportation from 4 to reactor well 7 will be described with reference to FIG.

In the example shown in FIG. 12, the height of the dryer 6 or the separator 5 is approximately the same as the width of the communicating portion A between the DS pool 4 and the reactor well 7 .

As shown in FIG. 12, the DS pool 4 and the reactor well 7 are filled with water (reference numeral 24 represents the water surface), a dryer 6 is arranged in the DS pool 4, and a dryer 6 is arranged in the DS pool 4. The separated separator 5 is sandwiched between the underwater transport devices 10A1 and 10A2 of this embodiment and transported.

Even if the height of the separator 5 is approximately the same as the width of the communicating portion A between the DS pool 4 and the reactor well 7 (even if the communicating portion is narrow), the underwater transport devices 10A1 and 10A2 of this embodiment By sandwiching between and conveying, it becomes possible to convey.

In the case of FIG. 12, since it is necessary to lower the separator 5 to the inside of the reactor pressure vessel 3, the hoisting tool 30 is installed on the top plate of the underwater transfer apparatus 10A1 and 10A2.

In FIG. 12, 3a is the flange upper surface of the reactor pressure vessel 3, 23 is the canal portion between the DS pool 4 and the reactor well 7, and 25 is the operation floor of the reactor building 1. FIG.

FIG. 13 shows a flow diagram of transporting the separator 5 or the dryer 6 from the DS pool 4 to the reactor well 7 using the underwater transport devices 10A1 and 10A2 of the present embodiment (FIG. 13 is an example of transporting the separator 5). , an example in which the separator 5 is suspended by the suspending tool 30 shown in FIG.

In FIG. 13, first, the underwater transfer devices 10A1 and 10A2 are carried into the DS pool 4 using an overhead crane (step (1)). Next, the hoisting tool 30 is carried onto the separator 5 using the overhead crane (step (2)), the hoisting tool 30 is lowered using the overhead crane and attached to the underwater transport devices 10A1 and 10A2, and the separator 5 is gripped. (step (3)).

Subsequently, the underwater transport devices 10A1 and 10A2 are filled with air to float the separator 5 (step (4)), the separator 5 is transferred to the reactor well 7 (step (5)), and the separator is placed in the reactor well 7. 5 is installed (step (6)). Next, the air is discharged from the underwater transport devices 10A1 and 10A2, the separator 5 is seated on the floor of the reactor well 7 (step (7)), and after the seating, the separator 5 is lowered using the lifting tool 30, Install in the original position in the furnace (step (8)). After that, the separator 5 is cut off from the hoisting tool 30, and the hoisting tool 30 is recovered (step (9)). After filling the underwater transfer devices 10A1 and 10A2 with air again and returning them to the DS pool 4, return to (step (1)) and transfer the dryer 6 into the reactor well 7 in the same procedure (step (10)). .

Next, an example of transporting the dryer 6 from the DS pool 4 to the reactor well 7 using the winch 27 with the underwater transport devices 10A1 and 10A2 will be described with reference to FIG.

FIG. 14(a) shows that the dryer 6 is installed in the DS pool 4 filled with water, and the overturn prevention bracket 20b on the side of the underwater transfer device 10A1 and the overturn prevention bracket on the side of the underwater transfer device 10A2. A wire (rope) connected to the winch 27 is hooked to each of 20d. In this state, the dryer 6 held by the underwater transfer devices 10A1 and 10A2 is moved to the front of the reactor well 7 (see FIG. 14(b)). At the position shown in FIG. 14(b), the wire (rope) is reconnected to the winch 27 (see FIG. 14(c)), and from the state shown in FIG. The dryer 6 is moved through the communicating portion A between the DS pool 4 and the reactor well 7 (see FIG. 14(d)), and the wire (rope) is repeatedly reconnected to the winch 27 to move the dryer 6 to the reactor well 7. The movement of the dryer 6 into the reactor well 7 is completed (see (e) of FIG. 14).

In this example, by pulling the overturn prevention brackets 20b and 20d on the sides of the underwater transport devices 10A1 and 10A2 with wires (ropes), the underwater transport devices 10A1 and 10A2 can be prevented from overturning when floating.

FIG. 15 is another example when applied to Unit 4 of the Fukushima Daiichi Nuclear Power Station. In Unit 4 of the Fukushima Daiichi Nuclear Power Station, the reactor well 7 is inside the cover building 9, and the DS pool 4 is outside the cover building 9. Same as the water nuclear power plant, but on the water the wall 9a of the cover building 9 is located between both pools.

FIG. 15 shows an example of using a long balance when transporting a structure X similar to the dryer 6 and the separator from the DS pool 4 to the reactor well 7 using the underwater transport devices 10A1 and 10A2 of the present invention.

In the example shown in FIG. 15, first, the underwater transport devices 10A1 and 10A2 are carried into the DS pool 4 using the overhead crane 9A (step (1)). Next, the structure X is carried into the DS pool 4 using the overhead crane 9A (step (2)) and attached to the underwater transport devices 10A1 and 10A2 (step (3)). Steps (1) to (3) are omitted in FIG. 15, and the subsequent steps will be described here.

After performing step (3), the underwater transport devices 10A1 and 10A2 are filled with air and the dryer 6 is floated (step (4)). Next, using the crawler crane 41, using the hanging point 2 of the long balance 40, connect to the underwater transport devices 10A1 and 10A2, lift the dryer 6 (step (5)), and move it to the wall 9a of the cover building 9 ( step (6)).

Subsequently, the load on the long object balance 40 is controlled to 0 using the buoyancy of the underwater transport devices 10A1 and 10A2. (step (7)), and moved to the center of the reactor well 7 (moving the suspension point 1 of the long balance 40 to the vicinity of the wall 9a of the cover building 9) (step (8)).

Next, after controlling the load on the long object balance 40 to 0 using the buoyancy of the underwater transport devices 10A1 and 10A2, the crane 26 in the cover is changed to the hanging point 2 of the long object balance 40 (step (9) ), and finally, the dryer 6 is carried into the reactor well 7 by the crane 26 in the cover (step (10)).

Next, procedures for adjusting the left-right and front-rear balances of the underwater transport devices 10A1 and 10A2 of this embodiment will be described with reference to FIG.

The upper part of FIG. 16 shows the procedure for adjusting the left-right balance of the underwater transfer devices 10A1 and 10A2, and the lower part of FIG. 16 shows the procedure for adjusting the front-rear balance of the underwater transfer devices 10A1 and 10A2.

First, the procedure for adjusting the left-right balance of the underwater transport devices 10A1 and 10A2 shown in the upper part of FIG. enters inside (step 12a). The underwater transfer device 10A1 (10A2) is separated from the overhead crane 9A, and the dryer 6 is held by the holding portion of the underwater transfer device 10A1 (10A2) (step 12b).

Next, air is introduced into the underwater transport device 10A1 (10A2) to generate buoyancy and lift the dryer 6 (step 12c). Step 12c is an example in which the underwater transport device 10A1 (10A2) is lifted with good balance. Step 12d is an example in which the underwater transport device 10A1 (10A2) is tilted to the right due to the holding position of the dryer 6 being displaced.

In the state of step 12d, the buoyancy is adjusted by taking air in and out of the buoyancy adjusting portion of the underwater transport device 10A1 (10A2), and the left and right balance is controlled (step 12e). By adjusting the left and right buoyancy, the tilt of the underwater transport device 10A1 (10A2) is corrected (step 12f).

The procedure for adjusting the left-right balance of the underwater transport devices 10A1 and 10A2 shown in the lower part of FIG. (step 12g). The underwater transfer devices 10A1 and 10A2 are separated from the overhead crane 9A, and the dryer 6 is held by the holding portions of the underwater transfer devices 10A1 and 10A2 (step 12h).

Next, by introducing air into the underwater transport devices 10A1 and 10A2, buoyancy is generated and the dryer 6 is lifted (step 12i). Note that step 12i is an example in which the underwater transport devices 10A1 and 10A2 are lifted in good balance. A step 12j is an example in which the underwater transport devices 10A1 and 10A2 are tilted forward due to the holding position of the dryer 6 being displaced.

In the state of step 12i, the buoyancy is adjusted by taking air in and out of the buoyancy adjusting portions of the underwater transport devices 10A1 and 10A2, and the front-rear balance is controlled (step 12k). By adjusting the front and rear buoyancy, the inclination of the underwater transport devices 10A1 and 10A2 is corrected (step 12l).

By using the underwater transfer apparatus and the underwater transfer method of this embodiment, the dryer 6 or the separator, which is an activated reactor internal structure stored in the water in the DS pool 4 in the reactor building 1 5 to the reactor well 7 underwater, without using a lifting machine such as an overhead crane that causes coordination with other work and waiting time, and with the activated reactor internal structure. Some dryers 6 or separators 5 can be transported underwater.

It should be noted that the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

DESCRIPTION OF SYMBOLS 1... Reactor building, 2... Reactor containment vessel, 3... Reactor pressure vessel, 3a... Flange upper surface of reactor pressure vessel, 4... Dryer separator (DS) pool, 5... Separator (steam separator), 6 ... dryer (steam dryer), 7 ... reactor well, 8 ... spent fuel pool (SFP), 9 ... cover building, 9A ... overhead crane, 9B ... fuel handling machine, 9a ... wall of cover building, 10A, 10A1 , 10A2...Underwater transport device, 11...Container, 11a...First small room, 11b...Second small room, 11c...Third small room, 11d...Fourth small room, 12a, 12b...L-shaped rod, 13... air hose, 13a... first hose, 13b... second hose, 13c... third hose, 13d... fourth hose, 14... weight, 15... lifting rod, 16a... buoyancy adjustment plate ( Partition plate) 16a1 Front and rear buoyancy adjustment plate 16a2 Left and right buoyancy adjustment plate 17, 30e Rod pin 18, 30f Air cylinder 19 Air hose 20a, 20b, 20c, 20d Overturn prevention bracket 21a, 21b ... Lifting eye 22a, 22c ... Upper connection bar 22b, 22d ... Lower connection bar 23 ... Canal part between DS pool and reactor well (pool in cover) 24 ... Water surface 25 ... Operation of reactor building Floor 26 Crane in cover 27 Winch 28 Shield plate 30 Hoist 30a Hoist 30b First member 30c Second member 30d Chain or wire 40 ... long balance, 41 ... crawler crane.

Claims (19)

Activated reactor internals stored in a dryer separator pool that is in water-filled communication with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. buoyant force is used to transport the submersible into the pool of the reactor well through the connected communication portion. The underwater transport device according to claim 1,
The underwater transport apparatus holds and transports the activated core internals so as to cover the activated core internals, or alternatively, the activated core internals are sandwiched between two underwater transport apparatuses. An underwater transport device characterized in that it holds and transports. The underwater transport device according to claim 2,
The underwater transport apparatus includes a buoyancy adjustment unit for adjusting buoyancy by taking gas in and out of water, a holding unit for holding the activated reactor internal structure, and the inside of the activated reactor by the holding unit. An underwater transport apparatus comprising an adjustment mechanism for adjusting balance in a horizontal direction in order to prevent overturning when holding a structure. The underwater transport device according to claim 3,
A plurality of lifting rods are provided in the activated core internals,
The holding part includes a rod pin installed on the upper part of the underwater transport device and an air cylinder having an air hose,
By injecting air from the air hose into the air cylinder and pushing out the rod pin, the rod pin fits into a hole formed in the upper part of the lifting rod to hold the activated core internals. An underwater transport device characterized by: The underwater transport device according to claim 3,
A plurality of lifting rods are provided in the activated core internals,
The hoisting device constituting the holding part includes a hoisting machine, a chain or wire that is lifted or lowered by the hoisting machine, a first member on which the hoisting machine is installed, and the chain or wire. A second member that is installed at the tip of the hoist and moves up and down along with the lifting and hanging operation by the hoist, a rod pin installed below the second member, and an air hose that operates the rod pin. a cylinder and
By injecting air from the air hose into the air cylinder and pushing out the rod pin, the rod pin fits into a hole formed in the upper part of the lifting rod to hold the activated core internals, In this state, the activated core internal structure is lifted and suspended in accordance with the lifting and suspending operations by the hoisting machine. The underwater transport device according to claim 3,
The holding part has an L-shaped rod whose L-shaped part can rotate and slide up and down. By rotating, the tip of the L-shaped part is installed under the activated core internals, and the underwater transport device rises due to buoyancy, so that the L-shaped part of the rod is activated. An underwater transfer apparatus characterized by lifting and holding a core internal structure. The underwater transport device according to claim 3,
The buoyancy adjustment unit is composed of a container formed in an inverted U shape and an air hose provided at the top of the container. An underwater transport device characterized in that buoyancy is adjusted by pushing out water from a side opening. The underwater transport device according to claim 7,
The underwater transport device is characterized by comprising an adjustment mechanism composed of weights for performing fine adjustment of front-rear and left-right balance. The underwater transport device according to claim 3,
The adjustment mechanism for adjusting the balance in the horizontal direction comprises a plurality of brackets installed on the outer surface of the underwater transport device. An underwater transport device, wherein the balance of the underwater transport device is adjusted. The underwater transport device according to claim 3,
The adjustment mechanism for adjusting the balance in the horizontal direction comprises a plurality of small chambers in which the inside of the underwater transport device is partitioned by partition plates, and hoses connected to each of the small chambers. wherein the balance of the underwater transport device is adjusted by adjusting the amount of air in each of the small rooms. The underwater transport device according to claim 10,
The underwater transport device is characterized by comprising an adjustment mechanism composed of weights for performing fine adjustment of front-rear and left-right balance. Activated reactor internals stored in a dryer separator pool that is in water-filled communication with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. An underwater transfer method, wherein the underwater transfer device uses buoyancy to transfer the fuel into the pool of the reactor well through the connected portion. The underwater transportation method according to claim 12,
When transporting the activated core internals with an underwater transport device using buoyancy,
The activated reactor internals are held and transported by the underwater transport apparatus so as to cover the activated reactor internals, or the activated reactor internals are sandwiched between the activated reactor internals by two underwater transport apparatuses. An underwater transport method characterized by holding and transporting. The underwater transportation method according to claim 13,
The underwater transport apparatus includes a buoyancy adjustment unit for adjusting buoyancy by taking gas in and out of water, a holding unit for holding the activated reactor internal structure, and the inside of the activated reactor by the holding unit. In order to prevent overturning when holding the structure, it is equipped with an adjustment mechanism that adjusts the balance in the horizontal direction,
The activated core internals are provided with a plurality of lifting rods, and the holding unit comprises a rod pin installed on top of the underwater transfer device and an air cylinder having an air hose,
By injecting air into the air cylinder through the air hose and pushing out the rod pin, the rod pin fits into a hole formed in the upper part of the lifting rod to hold the activated core internals. An underwater transport method characterized by transporting. The underwater transportation method according to claim 13,
The underwater transport apparatus includes a buoyancy adjustment unit for adjusting buoyancy by taking gas in and out of water, a holding unit for holding the activated reactor internal structure, and the inside of the activated reactor by the holding unit. In order to prevent overturning when holding the structure, it is equipped with an adjustment mechanism that adjusts the balance in the horizontal direction,
The activated core internals are provided with a plurality of lifting rods, and the hoisting device that constitutes the holding unit includes a hoist and a hoist that is lifted or suspended by the hoist. A chain or wire, a first member on which the hoisting machine is installed, and a second member installed at the tip of the chain or wire and moving up and down as the hoisting machine lifts and suspends, A rod pin installed below the second member, and an air cylinder having an air hose for operating the rod pin,
By injecting air from the air hose into the air cylinder and pushing out the rod pin, the rod pin fits into a hole formed in the upper part of the lifting rod to hold the activated core internals, An underwater transportation method, wherein the activated core internal structure is lifted and suspended in this state in accordance with the lifting and suspending operations by the hoisting machine. The underwater transportation method according to claim 13,
The underwater transport apparatus includes a buoyancy adjustment unit for adjusting buoyancy by taking gas in and out of water, a holding unit for holding the activated reactor internal structure, and the inside of the activated reactor by the holding unit. In order to prevent overturning when holding the structure, it is equipped with an adjustment mechanism that adjusts the balance in the horizontal direction,
The holding part has an L-shaped rod whose L-shaped part can rotate and slide up and down. By rotating, the tip of the L-shaped part is installed under the activated core internals, and the underwater transport device rises due to buoyancy, so that the L-shaped part of the rod is activated. An underwater transportation method characterized by lifting and holding a core internal structure for transportation. The underwater transportation method according to claim 13,
The underwater transport apparatus includes a buoyancy adjustment unit for adjusting buoyancy by taking gas in and out of water, a holding unit for holding the activated reactor internal structure, and the inside of the activated reactor by the holding unit. In order to prevent overturning when holding the structure, it is equipped with an adjustment mechanism that adjusts the balance in the horizontal direction,
The buoyancy adjustment unit is composed of a container formed in an inverted U shape and an air hose provided at the top of the container. An underwater transportation method, wherein water is forced out from a side opening to adjust buoyancy to transport the activated core internals. The underwater transportation method according to claim 13,
The underwater transport apparatus includes a buoyancy adjustment unit for adjusting buoyancy by taking gas in and out of water, a holding unit for holding the activated reactor internal structure, and the inside of the activated reactor by the holding unit. In order to prevent overturning when holding the structure, it is equipped with an adjustment mechanism that adjusts the balance in the horizontal direction,
The adjustment mechanism for adjusting the horizontal balance includes a plurality of brackets installed on the outer surface of the underwater transport device, wires are passed through the brackets, and the wires are pulled or loosened from the outside, An underwater transportation method, wherein the activated reactor internal structure is transported by adjusting the balance of the underwater transportation device. The underwater transportation method according to claim 13,
The underwater transport apparatus includes a buoyancy adjustment unit for adjusting buoyancy by taking gas in and out of water, a holding unit for holding the activated reactor internal structure, and the inside of the activated reactor by the holding unit. In order to prevent overturning when holding the structure, it is equipped with an adjustment mechanism that adjusts the balance in the horizontal direction,
The adjustment mechanism for adjusting the balance in the horizontal direction comprises a plurality of small chambers in which the inside of the underwater transport device is partitioned by partition plates, and hoses connected to each of the small chambers. The underwater transportation method, wherein the activated reactor internal structure is transported by adjusting the balance of the underwater transportation device by adjusting the amount of air in each of the small chambers.

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