JP7416538B2 - Underwater conveyance device and underwater conveyance method - Google Patents

Description

The present invention relates to an underwater conveyance device and an underwater conveyance method, and in particular, to a predetermined location of activated reactor internals stored underwater in a dryer separator (hereinafter referred to as DS) pool in a nuclear power plant. The present invention relates to an underwater conveyance device and an underwater conveyance method suitable for underwater conveyance.

At nuclear power plants, during regular inspections, activated reactor internal structures such as separators (steam water separators) and dryers (steam dryers) are exposed to water in the DS pool inside the reactor building. The furnace is kept in storage, and after regular inspections, the separator, dryer, etc. are returned to their predetermined positions in the furnace and the furnace is operated again.

The activated reactor internals, such as separators and dryers, are transported from the DS pool to the reactor well using a lifting device such as an overhead lane.

In addition, examples of prior art documents regarding underwater conveyance devices in nuclear power plants include Patent Documents 1, 2, and 3.

In the above-mentioned Patent Document 1, in order to shorten the work time for transporting objects in the reactor and to protect the objects during transportation, objects are transported by swimming in the reactor water of a nuclear reactor. The underwater transport device has a buoyancy adjustment section that can adjust the buoyancy in reactor water, an underwater moving section that generates hydraulic force in the vertical and horizontal directions of the reactor and can rotate around a vertical axis, and It is described that the device includes a conveyed object gripping section that grips the conveyed object, and a protection ring that protects the conveyed object in a state where the conveyed object is gripped.

In addition, in the above-mentioned Patent Document 2, a moving device inside a water-filled device that allows precise movement control and positioning is equipped with a camera and work equipment to monitor the inside of the water-filled device. and has an internal space having a narrow space moving device that can be moved within the device by a propulsion mechanism or wheels, an opening for allowing the narrow space moving device to go in and out, and a holding means for holding the narrow space moving device. A support device that stores the device so that it can be moved in and out and performs support operations for the narrow space moving device, which has an underwater moving means and can move inside the reactor by the underwater moving means, An underwater narrow space moving system is disclosed in which the support device is released from the holding means by the supporting device, and the narrow space moving device is caused to transmit information through the opening.

Furthermore, in the above-mentioned Patent Document 3, in order to obtain an underwater mobile repair inspection device that can reliably prevent vertical positional displacement of an underwater vehicle that freely moves underwater, such as inside a nuclear reactor, The underwater vehicle is equipped with a buoyancy generating device that generates buoyancy for the purpose of buoyancy, a device for swimming and wall suction, and at least one running wheel, and a work tool is attached to the underwater vehicle, and a work tool is attached to the underwater vehicle. It is described that a guide roller is provided that contacts the lower surface of the target structure.

Japanese Patent Application Publication No. 2013-3073 Japanese Patent Application Publication No. 2003-40194 Japanese Patent Application Publication No. 2007-212393

However, the underwater conveyance device described in Patent Document 1 mentioned above performs conveyance work such as moving objects to be conveyed such as fuel and control rods installed underwater in a nuclear power plant and installing them at another location. In addition, the underwater conveyance devices described in Patent Documents 2 and 3 are for inspection, inspection, preventive maintenance, and repair of the internal reactor structures of a nuclear reactor filled with water. , the intention is to transport activated reactor internals, such as separators and dryers, stored underwater in the DS pool in the reactor building to a predetermined location (e.g. reactor well). It's not something you have.

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

For this reason, when transporting the activated reactor internals, such as separators and dryers, which are stored underwater in the DS pool in the reactor building, to a designated location, it is necessary to combine them with other work. It is desirable to transport activated reactor internals, such as separators and dryers, underwater without using lifting equipment such as overhead lanes, which requires adjustment and waiting time.

The present invention has been made in view of the above-mentioned points, and its purpose is to move the activated reactor internals stored underwater in the DS pool in the reactor building to a predetermined location. An object of the present invention is to provide an underwater conveyance device and an underwater conveyance method that can convey underwater objects without using a lifting machine such as an overhead crane, which requires coordination with work and waiting time.

In order to achieve the above object, the underwater conveyance device of the present invention transports activated reactor internals stored in a dryer separator pool that is filled with water and communicates with the reactor well pool. An underwater transport device that transports the activated reactor internal structure into the reactor well pool using buoyancy via a water-filled communication section between the reactor well pool and the dryer separator pool. Holding and transporting the activated reactor internals so as to cover them, or holding and transporting the activated reactor internals with the activated reactor internals sandwiched between them using two underwater transport devices;
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism to adjust the balance in the horizontal direction to prevent the structure from falling while being held.
The activated reactor internal structure is provided with a plurality of lifting rods,
The holding unit includes a rod pin installed on the top of the underwater conveyance 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 engages with a hole formed in the upper part of the lifting rod, thereby holding the activated reactor internal structure. It is characterized by

In addition, in order to achieve the above object, the underwater transportation method of the present invention provides activated reactor internals stored in a dryer separator pool that is filled with water and communicates with the reactor well pool. An underwater transport method in which the reactor well pool is transported by an underwater transport device using buoyancy into the reactor well pool through a water-filled communication section between the reactor well pool and the dryer separator pool,
When transporting the activated reactor internals using an underwater transport device using buoyancy,
Either the underwater transport device holds and transports the activated reactor internals so as to cover them, or the activated reactor internals are sandwiched between two underwater transport devices. hold and transport,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism that adjusts the balance in the horizontal direction to prevent the structure from falling while holding the structure, and
The activated reactor internal structure is provided with a plurality of lifting rods, and the holding section further includes a rod pin installed at the top of the underwater conveyance device and an air cylinder having an air hose. ,
By injecting air into the air cylinder with the air hose and pushing out the rod pin, the rod pin engages with the hole formed in the upper part of the lifting rod to hold the activated reactor internal structure. It is characterized by being transported .

According to the present invention, activated reactor internal structures stored underwater in the DS pool in the reactor building can be moved to a predetermined location using an overhead crane or the like that requires coordination with other work and waiting time. Can be transported underwater without using lifting equipment.

During periodic inspections of general boiling water reactors, activated reactor internals such as separators and dryers are temporarily placed in the DS pool from the reactor pressure vessel through the reactor well pool. FIG. FIG. 2 is a plan view of FIG. 1; FIG. 1 is a cross-sectional view of a first embodiment of the underwater conveyance device of the present invention, showing an example in which the underwater conveyance device covers and holds a dryer, which is an activated reactor internal structure. FIG. 1 is a cross-sectional view of a first embodiment of the underwater conveyance device of the present invention, showing an example in which an activated reactor internal structure dryer is sandwiched and held between two underwater conveyance devices. It is a front view showing an example of a holding part which constitutes an underwater conveyance device of the present invention. FIG. 6 is a plan view of FIG. 5; FIG. 2 is a perspective view showing the outer shape of an example of an adjustment mechanism that adjusts the balance in the horizontal direction, which constitutes the underwater conveyance 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 conveyance device of the present invention. It is a front view which shows another example of the holding|maintenance part which comprises the underwater conveyance apparatus of this invention. FIG. 9 is a plan view of FIG. 9; The details of the holding part shown in FIGS. 9 and 10 are shown. (a) shows the state before the dryer and separator are suspended by the hoist, and (b) shows the state before the dryer and separator are suspended by the hoist. FIG. FIG. 3 is a diagram illustrating an example in which a separator installed in water at the same depth as the separator is transported from a DS pool to a reactor well pool during periodic inspection of a general boiling water reactor. FIG. 2 is a flowchart showing an example of transporting a separator or dryer from a DS pool to a pool of a reactor well using the underwater transport device of the present invention, and suspending the separator or dryer using a hanging tool. FIG. 3 is a flowchart showing a front and plan view of an example in which a winch is used to transport a dryer from a DS pool to a reactor well pool using the underwater transport device of the present invention. FIG. 3 is a flow diagram showing an example of using a long object balance when transporting a structure from a DS pool to a pool of a reactor well using the underwater transport device of the present invention. FIG. 2 is a flow diagram illustrating a procedure for adjusting the left-right and front-back balance of the underwater conveyance device of the present invention.

EMBODIMENT OF THE INVENTION Below, the underwater conveyance apparatus and underwater conveyance method of this invention are demonstrated based on the Example illustrated. In each figure, the same reference numerals are used for the same components. Furthermore, the following is merely an example of implementation, and is not intended to limit the content of the invention to the specific embodiments described below.

Figures 1 and 2 show that during periodic inspections of a typical boiling water reactor, activated reactor internals such as a separator (steam water separator) and dryer (steam dryer) are removed from the reactor pressure vessel. 1 is a front view, and FIG. 2 is a plan view of FIG. 1.

Usually, a nuclear power plant includes 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 a top cover attached to the upper end, and has a dry well formed inside and a pressure suppression pool filled with cooling water. It has a pressure suppression chamber formed therein.

The nuclear reactor also includes a reactor pressure vessel 3 configured with a reactor pressure vessel upper cover attached, a reactor core loaded with a plurality of fuel assemblies containing nuclear fuel material, a separator 5, a dryer 6, etc. . The reactor core, separator 5 and dryer 6 are arranged inside the reactor pressure vessel 3.

In addition, each fuel assembly loaded in the core is supported at its lower end by a core support plate, and its upper end is held by an upper lattice plate, and the separator 5 is located at a lower end than the upper lattice plate located at the upper end of the core. The dryer 6 is arranged above the separator 5.

In addition, the reactor building 1 is provided with a DS pool 4 and a spent fuel pool (SFP) 8 for storing used fuel, sandwiching the reactor well 7. It is used as a place (storage place) for temporarily storing furnace internal structures such as the separator 5 and the dryer 6.

In addition, in FIGS. 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, and the DS pool 4 and the reactor well 7 are filled with water at the communication part A. are connected in a filled state.

As shown in FIG. 2, the communication section 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 device of this embodiment transports the separator 5 or dryer 6, which is an activated reactor internal structure stored in the DS pool 4 which is filled with water and communicates with the reactor well 7, into the reactor. It is characterized in that it is transported into the reactor well 7 using buoyancy via a water-filled communication section A between the well 7 and the DS pool 4.

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

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

In addition, as shown in FIGS. 3, 4, 5, and 6, the dryer 6 (or separator 5) has a plurality of (four in this embodiment) lifting rods 15 each having a hole formed in the upper part. The holding section in the example shown in FIGS. 5 and 6 includes a rod pin 17 installed at the top of the underwater conveyance devices 10A1 and 10A2, and an air cylinder 18 having an air hose 19. 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, thereby holding the dryer 6 (or 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. It is.

Further, the holding part of the underwater conveyance device 10A shown in FIG. 3 has L-shaped rods 12a and 12b that can rotate and slide up and down. 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 below the dryer 6 (or separator 5), and the underwater conveyance 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 separator 5).

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

The buoyancy adjustment section of the underwater conveyance 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.

Furthermore, the underwater conveyance device 10A shown in FIG. 3 is equipped with an adjustment mechanism consisting of a weight 14 for finely adjusting the balance between the front and back and the left and right sides. The underwater conveyance device 10A shown in FIG. 3 has good balance, so it only needs to be adjusted vertically. However, if it is equipped with a weight 14, it is possible to finely adjust the balance between front and back and left and right, making the underwater conveyance device more reliable. Can balance 10A.

Although not particularly shown, the buoyancy adjustment sections of the underwater transportation devices 10A1 and 10A2 shown in FIG. 4 have the same configuration as the buoyancy adjustment section of the underwater transportation 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 balance between the front and back and the left and right sides, similarly to the underwater transport device 10A shown in FIG.

Next, a plurality of adjustment mechanisms (four in this example) are installed on the outer surface of the underwater transport devices 10A1 and 10A2 to adjust the horizontal balance in the underwater transport devices 10A1 and 10A2 shown in FIGS. 5 and 6. A wire (not shown) is passed through the fall prevention brackets 20a, 20b, 20c and 20d, and by pulling or loosening the wire from the outside, underwater transportation is possible. The balance of devices 10A1 and 10A2 can be adjusted.

Further, as other examples of the adjustment mechanism for adjusting the horizontal balance of the underwater conveyance devices 10A1 and 10A2, there are examples shown in FIGS. 7 and 8.

FIG. 7 is a perspective view showing the outline of an example of an adjustment mechanism for adjusting the horizontal balance that constitutes the underwater conveyance devices 10A1 and 10A2 of this embodiment, and FIG. 8 shows the underwater conveyance devices 10A1 and 10A2 of this embodiment. It is a perspective view showing the internal structure of an example of the adjustment mechanism which adjusts the balance in the horizontal direction.

The adjustment mechanism for adjusting the horizontal balance in the underwater conveyance devices 10A1 and 10A2 of this embodiment has a plurality of internal 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 (a first small room 11a, a second small room 11b, a third small room 11c, and a fourth small room 11d) partitioned by a board 16a2); From the first hose 13a, second hose 13b, third hose 13c, and 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 determined by By adjusting each of the 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 conveyance devices 10A1 and 10A2, the air adjustment amount of the second small room 11b and the fourth small room 11d and the first small room 11a and the third small room 11c is When adjusting by changing the balance and balancing the left and right sides of the underwater conveyance devices 10A1 and 10A2, the first small room 11a, the second small room 11b, the third small room 11c, and the fourth small room It is adjusted by changing the balance of the air adjustment amount in 11d.

Thereby, it is possible to prevent the underwater transport devices 10A1 and 10A2 from falling over.

Next, other examples of the holding parts constituting the underwater conveyance devices 10A1 and 10A2 of the present invention will be described using FIGS. 9, 10, and 11. FIG. 9 is a front view of a holding part that constitutes the underwater conveyance devices 10A1 and 10A2, FIG. 10 is a plan view of FIG. 9, and FIG. 11(a) shows the state before the dryer or separator is suspended by the hanging tool 30, and FIG. 11(b) shows the state in which the dryer or separator is suspended by the hanging tool 30. .

In the examples of the holding parts that make up the underwater conveyance devices 10A1 and 10A2 shown in FIGS. 9, 10, and 11, the lifting tool 30 that makes up the holding part is lifted by a hoisting machine 30a, and A chain or wire 30d to be suspended, a first member 30b on which a hoist 30a is installed, and a first member 30b installed at the tip of the chain or wire 30d, which moves up and down as the hoist 30a lifts and lowers. It includes 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 from the air hose 19 into the air cylinder 30f and pushing out the rod pin 30e, the rod pin 30e engages with the hole formed in the upper part of the lifting rod 15 and holds the dryer 6 (or separator 5). In this state, the dryer 6 (or separator 5) is lifted and lowered by the lifting and lowering operations by the hoisting machine 30a (the state shown in FIG. 11(b)). ).

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

Next, using the underwater conveyance devices 10A1 and 10A2 of this embodiment, during periodic inspection of a general boiling water reactor, the separator 5 installed in water at the same depth as the separator 5 is moved into the DS pool. An example of transporting the reactor from the reactor well 7 to the reactor well 7 will be explained using FIG. 12.

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 communication 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 (numeral 24 represents the water surface), and the dryer 6 is arranged in the DS pool 4. The separator 5, which had been used for a long time, is conveyed by being sandwiched between the underwater conveyance devices 10A1 and 10A2 of this embodiment.

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

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 hanger 30 is installed on the top plate of the underwater transport devices 10A1 and 10A2.

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

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

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

Subsequently, the underwater transport devices 10A1 and 10A2 are filled with air to float the separator 5 (step (4)), and the separator 5 is transferred to the reactor well 7 (step (5)). 5 (step (6)). Next, air is discharged from the underwater conveyance devices 10A1 and 10A2, and the separator 5 is seated on the floor of the reactor well 7 (step (7)). After seating, the separator 5 is lowered using the hanger 30, and the atom Install it in the original position in the furnace (step (8)). Thereafter, the separator 5 is separated from the hanging tool 30, and the hanging tool 30 is recovered (step (9)). After filling the underwater transport 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 using the same procedure (step (10)). .

Next, an example of transporting the dryer 6 from the DS pool 4 to the reactor well 7 by the underwater transport devices 10A1 and 10A2 using the winch 27 will be described using FIG. 14.

In FIG. 14(a), the dryer 6 is installed in the DS pool 4 filled with water, and the fall prevention bracket 20b on the side of the underwater conveyance device 10A1 and the fall prevention bracket on the side of the underwater conveyance device 10A2 are shown. A wire (rope) connected to a winch 27 is hooked onto each of the wires 20d. In this state, the dryer 6 held by the underwater transport devices 10A1 and 10A2 is moved to the front of the reactor well 7 (see FIG. 14(b)). The wire (rope) is reconnected to the winch 27 at the position shown in FIG. 14(b) (see FIG. 14(c)), and from this state shown in FIG. Move the dryer 6 to the communication part A between the DS pool 4 and the reactor well 7 (see (d) in FIG. 14), repeat the connection of the wire (rope) to the winch 27, and move the dryer 6 to the reactor well 7. The movement of the dryer 6 into the reactor well 7 is completed (see (e) in FIG. 14).

In this example, by pulling the fall prevention brackets 20b and 20d on the side surfaces of the underwater transport devices 10A1 and 10A2 with wires (ropes), it is possible to prevent the underwater transport devices 10A1 and 10A2 from falling when floating.

FIG. 15 is another example of application to Unit 4 of the Fukushima Daiichi Nuclear Power Plant. At Fukushima Daiichi Nuclear Power Station Unit 4, the reactor well 7 is located inside the cover building 9, and the DS pool 4 is located outside the cover building 9, so the fact that both pools are connected underwater means that boiling It is the same as a water-type nuclear power plant, but on the water, the wall 9a of the cover building 9 is located between the two pools.

FIG. 15 shows an example in which a long scale is used to transport structures 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 is attached to the underwater transport devices 10A1 and 10A2 (step (3)). In FIG. 15, steps (1) to (3) are omitted, and the subsequent steps will be explained here.

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

Next, the load on the long object balance 40 is controlled to 0 using the buoyancy of the underwater conveyance devices 10A1 and 10A2, and then the hanging point of the crawler crane 41 is changed to the hanging point 2, and the long object balance 40 is lifted by the crane 26 inside the cover. (Step (7)) and move it to the center of the reactor well 7 (move the hanging point 1 of the long balance 40 to near 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 conveyance devices 10A1 and 10A2, the hanging point of 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 using the crane 26 inside the cover (step (10)).

Next, a procedure for adjusting the left-right and front-back balance of the underwater conveyance devices 10A1 and 10A2 of this embodiment will be explained using FIG. 16.

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

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

Next, air is introduced into the underwater conveyance device 10A1 (10A2) to generate buoyancy and lift the dryer 6 (step 12c). Note that step 12c is an example in which the underwater transport device 10A1 (10A2) is lifted in a well-balanced manner. Step 12d is an example in which the underwater conveyance device 10A1 (10A2) is tilted to the right side due to a shift in the holding position of the dryer 6 or the like.

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

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

Next, air is introduced into the underwater conveyance devices 10A1 and 10A2 to generate buoyancy and lift the dryer 6 (step 12i). Note that step 12i is an example in which the underwater transport devices 10A1 and 10A2 are lifted in a well-balanced manner. Step 12j is an example in which the underwater conveyance devices 10A1 and 10A2 are tilted forward due to, for example, a shift in the holding position of the dryer 6.

In the state of step 12i, the buoyancy is adjusted by letting air in and out of the buoyancy adjustment parts of the underwater conveyance 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 transport device and underwater transport method of this embodiment, the dryer 6 or the separator, which is an activated reactor internal structure stored underwater in the DS pool 4 in the reactor building 1, 5 to the reactor well 7 underwater, the activated reactor internal structure was moved to a designated location without using a lifting machine such as an overhead crane, which would require coordination with other work or waiting time. Certain dryers 6 or separators 5 can be transported underwater.

Note that the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the embodiments described above are described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. Furthermore, it is possible to replace a 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. Further, it is possible to add, delete, or replace a part of the configuration of each embodiment with other configurations.

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 water 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 conveyance device, 11...Container, 11a...First small room, 11b...Second small room, 11c...Third small room, 11d...Fourth small room, 12a, 12b...L-shape 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... Fall prevention bracket, 21a, 21b ...Lifting eye, 22a, 22c...Upper connection bar, 22b, 22d...Lower connection bar, 23...Canal section between DS pool and reactor well (pool in cover), 24...Water surface, 25...Reactor building operation Floor, 26... Crane in cover, 27... Winch, 28... Shielding plate, 30... Lifting device, 30a... Hoisting machine, 30b... First member, 30c... Second member, 30d... Chain or wire, 40 ...Long object balance, 41...Crawler crane.

Claims (12)

Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. The underwater transport device that uses buoyancy to transport the reactor well into the reactor well pool through the communication section is either held and transported so as to cover the activated reactor internals, or two underwater transport devices are used. Holding and transporting the activated reactor internals with the underwater transport device,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism to adjust the balance in the horizontal direction to prevent the structure from falling while being held.
The activated reactor internal structure is provided with a plurality of lifting rods,
The holding unit includes a rod pin installed on the top of the underwater conveyance 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 engages with a hole formed in the upper part of the lifting rod, thereby holding the activated reactor internal structure. An underwater transport device featuring: Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. The underwater transport device that uses buoyancy to transport the reactor well into the reactor well pool through the communication section is either held and transported so as to cover the activated reactor internals, or two underwater transport devices are used. Holding and transporting the activated reactor internals with the underwater transport device,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism to adjust the balance in the horizontal direction to prevent the structure from falling while being held.
The activated reactor internal structure is provided with a plurality of lifting rods,
The lifting device constituting the holding section includes a hoisting machine, a chain or wire that is lifted or suspended 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 as the hoist moves up and down as the hoist moves, a rod pin that is installed below the second member, and an air hose that operates the rod pin. comprising a cylinder ;
By injecting air from the air hose into the air cylinder and pushing out the rod pin, the rod pin engages in a hole formed in the upper part of the lifting rod to hold the activated reactor internal structure; The underwater conveyance device is characterized in that, in this state, the activated reactor internal structure is lifted and hung in conjunction with the hoisting and hanging operations by the hoisting machine. Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. The underwater transport device that uses buoyancy to transport the reactor well into the reactor well pool through the communication section is either held and transported so as to cover the activated reactor internals, or two underwater transport devices are used. Holding and transporting the activated reactor internals with the underwater transport device,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism to adjust the balance in the horizontal direction to prevent the structure from falling while being held.
The holding part has an L-shaped rod in which the L-shaped part can rotate and slide up and down, and the L-shaped rod is arranged at the lower part of the underwater conveyance device. By rotating the rod, the tip of the L-shaped part is placed under the activated reactor internal structure, and as the underwater conveyance device rises due to buoyancy, the L-shaped part of the rod is placed under the activated reactor internal structure. An underwater conveyance device that lifts and holds reactor internals. Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. The underwater transport device that uses buoyancy to transport the reactor well into the reactor well pool through the communication section is either held and transported so as to cover the activated reactor internals, or two underwater transport devices are used. Holding and transporting the activated reactor internals with the underwater transport device,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism to adjust the balance in the horizontal direction to prevent the structure from falling while being held.
The buoyancy adjustment section includes a container formed in an inverted U shape and an air hose provided at the top of the container , and air enters and exits the container by taking air in and out from the air hose, thereby increasing the volume of the container. Water is pushed out from the lower opening and buoyancy is adjusted .
The underwater conveyance device is characterized in that the underwater conveyance device is equipped with an adjustment mechanism consisting of a weight that finely adjusts the balance between front and rear and left and right . Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. The underwater transport device that uses buoyancy to transport the reactor well into the reactor well pool through the communication section is either held and transported so as to cover the activated reactor internals, or two underwater transport devices are used. Holding and transporting the activated reactor internals with the underwater transport device,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism to adjust the balance in the horizontal direction to prevent the structure from falling while being held.
The adjustment mechanism for adjusting the balance in the horizontal direction includes a plurality of brackets installed on the outer surface of the underwater conveyance device, and by passing a wire through the bracket and pulling or loosening the wire from the outside, An underwater conveyance device characterized in that the balance of the underwater conveyance device is adjusted. Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. The underwater transport device that uses buoyancy to transport the reactor well into the reactor well pool through the communication section is either held and transported so as to cover the activated reactor internals, or two underwater transport devices are used. Holding and transporting the activated reactor internals with the underwater transport device,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism to adjust the balance in the horizontal direction to prevent the structure from falling while being held.
The adjustment mechanism that adjusts the balance in the horizontal direction includes a plurality of small chambers in which the interior of the underwater conveyance device is partitioned by partition plates, and a hose connected to each of the small chambers , and the water is injected from the hose. An underwater conveyance device characterized in that the balance of the underwater conveyance device is adjusted by adjusting the amount of air supplied to each of the small rooms. The underwater conveyance device according to claim 6 ,
The underwater conveyance device is characterized in that the underwater conveyance device is equipped with an adjustment mechanism consisting of a weight that finely adjusts the balance between front and rear and left and right. Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. An underwater transport method in which the reactor well is transported by an underwater transport device using buoyancy into the pool of the reactor well through a communication section, the method comprising:
When transporting the activated reactor internals using an underwater transport device using buoyancy,
Either the underwater transport device holds and transports the activated reactor internals so as to cover them, or the activated reactor internals are sandwiched between two underwater transport devices. hold and transport,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism that adjusts the balance in the horizontal direction to prevent the structure from falling while holding the structure, and
The activated reactor internal structure is provided with a plurality of lifting rods, and the holding section further includes a rod pin installed at the top of the underwater conveyance device and an air cylinder having an air hose. ,
By injecting air into the air cylinder with the air hose and pushing out the rod pin, the rod pin engages with the hole formed in the upper part of the lifting rod to hold the activated reactor internal structure. An underwater transportation method characterized by transportation . Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. An underwater transport method in which the reactor well is transported by an underwater transport device using buoyancy into the pool of the reactor well through a communication section, the method comprising:
When transporting the activated reactor internals with an underwater transport device using buoyancy,
Either the underwater transport device holds and transports the activated reactor internals so as to cover them, or the activated reactor internals are sandwiched between two underwater transport devices. hold and transport,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism that adjusts the balance in the horizontal direction to prevent the structure from falling while holding the structure , and
The activated reactor internal structure is provided with a plurality of lifting rods, and furthermore, the lifting device constituting the holding part is lifted or suspended by a hoisting machine and the hoisting machine. a chain or wire, a first member on which the hoist is installed, a second member that is installed at the tip of the chain or wire and moves up and down as the hoist moves up and down as the hoist moves; comprising 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 engages in a hole formed in the upper part of the lifting rod to hold the activated reactor internal structure; An underwater conveyance method characterized in that in this state, lifting and hanging operations of the activated reactor internal structure are performed in conjunction with lifting and hanging operations by the hoisting machine. Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. An underwater transport method in which the reactor well is transported by an underwater transport device using buoyancy into the pool of the reactor well through a communication section, the method comprising:
When transporting the activated reactor internals using an underwater transport device using buoyancy,
Either the underwater transport device holds and transports the activated reactor internals so as to cover them, or the activated reactor internals are sandwiched between two underwater transport devices. hold and transport,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism that adjusts the balance in the horizontal direction to prevent the structure from falling while holding the structure , and
The holding part has an L-shaped rod in which the L-shaped part can rotate and slide up and down, and the L-shaped rod is arranged below the underwater conveyance device. By rotating the rod, the tip of the L-shaped part is placed under the activated reactor internal structure, and as the underwater conveyance device rises due to buoyancy, the L-shaped part of the rod is placed under the activated reactor internal structure. An underwater transportation method characterized by lifting and holding reactor internals and transporting them. Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. An underwater transport method in which the reactor well is transported by an underwater transport device using buoyancy into the pool of the reactor well through a communication section, the method comprising:
When transporting the activated reactor internals using an underwater transport device using buoyancy,
Either the underwater transport device holds and transports the activated reactor internals so as to cover them, or the activated reactor internals are sandwiched between two underwater transport devices. hold and transport,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism that adjusts the balance in the horizontal direction to prevent the structure from falling while holding the structure , and
The adjustment mechanism for adjusting the balance in the horizontal direction includes a plurality of brackets installed on the outer surface of the underwater conveyance device, and by passing a wire through the bracket and pulling or loosening the wire from the outside, An underwater transport method, characterized in that the activated reactor internal structure is transported by adjusting the balance of the underwater transport device. Activated reactor internals stored in a dryer separator pool filled with water and communicating with the reactor well pool are filled with water from the reactor well pool and the dryer separator pool. An underwater transport method in which the reactor well is transported by an underwater transport device using buoyancy into the pool of the reactor well through a communication section, the method comprising:
When transporting the activated reactor internals using an underwater transport device using buoyancy,
Either the underwater transport device holds and transports the activated reactor internals so as to cover them, or the activated reactor internals are sandwiched between two underwater transport devices. hold and transport,
The underwater conveyance device includes a buoyancy adjustment section that adjusts buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy by taking gas in and out of the water, a holding section that holds the activated reactor internal structure, and a buoyancy adjustment section that adjusts the buoyancy of the activated reactor internal structure by the holding section. Equipped with an adjustment mechanism that adjusts the balance in the horizontal direction to prevent the structure from falling while holding the structure , and
The adjustment mechanism that adjusts the balance in the horizontal direction includes a plurality of small chambers in which the interior of the underwater conveyance device is partitioned by partition plates, and a hose connected to each of the small chambers , and the water is injected from the hose. An underwater transportation method, characterized in that the activated reactor internal structure is transported by adjusting the balance of the underwater transportation device by adjusting the amount of air carried in each of the small rooms.

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