JPS60243597A - Fuel pool facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a fuel pool for storing spent fuel and reactor equipment of a nuclear power plant. This invention relates to fuel pool equipment that prevents leakage due to movement 1.

[Technical Background of the Invention] Nuclear fuel storage equipment in a conventional nuclear power plant 1 is generally installed within the reactor building. 2 As shown in Figure 1, a large amount of water (hereinafter referred to as pool water) 2 is held due to spent fuel, etc. FIG. 2 shows a perspective view of a conventional fuel pool.

The wall and bottom of the fuel pool 1 are made of reinforced concrete 3.
A spent fuel rack 5 containing spent fuel 4 is stored in a fuel pool 1, and the spent fuel rack 5 has a structure that has a shielding effect by maintaining a sufficient depth of water in the upper part of the spent fuel rack 5. It has become. The upper end of the fuel pool 1 is connected to a fuel exchange floor 61, and a lining 7 made of stainless steel is provided on the inner surface of the fuel pool 1 to prevent pool water 2 from leaking.

A fuel pool cooling and purification system (not shown) is connected to the fuel pool 11, and the spent fuel 4 is transferred to the reactor auxiliary equipment cooling system through a decay heat exchanger (1), thereby cooling the pool water 2. , the purity and clarity of the pool water 2 is maintained by a filtration demineralizer. Further, the fuel pool 1
The design takes into account the dissipation of water from the fuel pool, including the provision of a water leakage detector and a water level alarm system to monitor leakage caused by damage to the lining 7 of the fuel pool.

[Problems with background technology]

Since the fuel tank 1 having the structure and function described above is generally installed in the upper part of the reactor building, it has a structure that is easily affected by an earthquake. FIG. 3 is a schematic sectional view showing a situation in which pool water 2 shakes due to an earthquake and flows out of a fuel exchange floor 61 in a conventional fuel pool 1. Third
As shown in the figure, if an earthquake with large seismic acceleration occurs, the pool water 2 will oscillate and spill out from the refueling floor 61, requiring workers to clean it. There was a possibility that a situation that was not in line with the safety design, such as worker exposure to radiation, could occur. Since the fuel pool is an extremely important facility for safety, there has been a demand for a structure that can function satisfactorily against anticipated earthquakes, especially from the standpoint of seismic design.

[Object of the Invention] An object of the present invention is to provide a fuel pool that does not affect the function of a fuel pool as a storage facility for spent fuel, etc., and that does not impede the handling of spent fuel, etc. An object of the present invention is to provide a fuel pool facility that prevents pool water from flowing out of a fuel exchange bed.

[Summary of the invention]

The present invention provides a fuel pool for storing spent fuel and reactor equipment in a nuclear power generation plan H, a water control plate mounting portion attached to an upper side wall of the fuel pool, and a vertical direction of the water control plate mounting portion. a water control plate hinged to the water control plate; a water control plate support member provided at the lower part of the water control plate and hinged to the right side of the fuel pool; and the water control plate support member and the water control plate. The fuel comprises a coupling member that is detachably coupled, and the coupling member is a fixed bottle that is rotatably attached to one end of a water control plate support member and that is detachably fixed to the water control plate. In the pool equipment.

Embodiments of the Invention] A first embodiment of the present invention will be described below with reference to FIG. 1 and FIGS. 4 to 7. FIG. 1 shows a perspective view of the fuel pool of the present invention. In FIG. 1, the fuel pool 10 is located in the reactor building and has a rectangular shape dug in the form of a bit from the fuel exchange floor 11, and the spent fuel 12 is stored in the pit. A rack 13 is arranged. Spent fuel 1 stored in this spent fuel rack 13
A large amount of pool water 14 is held in the fuel pool 10 in order to cool the fuel. In order to prevent this pool water 14 from flowing out, the side walls and bottom of the fuel pool are constructed of reinforced concrete walls 15.
A lining 16 made of stainless steel is provided on the inner wall surface of the housing. Further, a fuel pool water vibration prevention equipment 17 is installed on the upper part of the inner wall of the fuel pool 10. The configuration of this fuel boule water shaking prevention equipment 17 will be explained with reference to FIGS. 4 and 5. 4 and 5 are a perspective view and a vertical cross-section of the fuel boule water shaking prevention equipment shown in FIG. 1. In FIGS. 4 and 5, an embedded fitting 18 is embedded in the upper part of the reinforced concrete wall 15 provided on the side wall of the fuel pool 10, and this embedded fitting 18 has a water control plate mounting portion. 19 and the water control plate support member mounting portion 20 are welded. A water control plate 21 is hinged to the water control plate mounting portion 19 so as to be freely rotatable in the vertical direction, and the water control plate support mounting portion 201 and the water control plate support member 22 are freely rotatable in the left and right direction] It's tied up. The water control plate support member 22 and the water control plate 21 are removably connected to each other by a water control plate fixing bolt 23.

In the above configuration, the operation of the present invention will be explained below. FIG. 6 is a schematic cross-sectional view showing a state in which the fuel pool water shaking prevention equipment 17 is arranged to prevent the fuel pool water 14 from flowing into the fuel exchange floor 11 according to the present invention. As shown in FIG. 6, waves generated by the shaking of the pool water 14 during an earthquake collide with the water control plate 21. At this time, water control plate 2
The force of the waves received by 1 is transmitted from the water control plate fixing bolt 23 to the water control plate support member 22, the water control plate support member mounting portion 20, and the embedded metal fitting 18.
is transmitted to and absorbed by the reinforced concrete wall 15 via. As a result, the force of the waves is reduced by the fuel pool water shaking prevention equipment 17.
1 is suppressed.

131 spent fuel racks in the fuel pool 10
Fold it up once as shown in the figure. Here, FIGS. 7(a) and 7(b) show the fuel pool water shaking prevention equipment 17 shown in the present invention.
It is a front view and a side view showing a folded state.

In FIG. 7, when folding the fuel pool water vibration prevention equipment 17, the water control plate 21 is lifted using an overhead crane inside the reactor building (not shown), and then the water control plate fixing bolts 23 are removed and the water control plate 21 is lifted up. Rotate until it is parallel to the side wall. Then, by rotating the water control plate 21 around the water control plate mounting portion 19 and lowering it downward, the fuel pool water swing prevention equipment 17 can be folded. 'Also, in order to restore the folded state to the original state, first use an overhead crane to lift the water control plate 21, and then attach the water control plate mounting part 19.
Rotate around the center and lift upward. Thereafter, rotate the water control plate support member 22 around the center 1 until the water control plate support member 22 is perpendicular to the side wall of the reinforced concrete wall 15, and place it on top of the water control plate support member 22. Mount the water control plate 21, and then connect the bolt holes of the water control plate 21 and the water control plate support member 22.
Align the bolt holes and insert the water control plate fixing bolts 23 into the bolt holes. By carrying out the above steps, the fuel pool water shaking prevention equipment 17 is restored to its original state.

Through the above operations, the fuel pool equipment according to the present invention is collapsible, so it does not obstruct the work at the time of fuel exchange at all, and also does not require storage space, which may impede workability. Never.

A second embodiment of the present invention will be described below with reference to FIGS. 8 and 9. In FIG. 8, the same reference numerals are given to the parts of the present invention, and the explanation of the structure thereof will be omitted. In FIG. 8, a water control plate 31 is hinged to the water control plate mounting portion 19 so as to be freely rotatable in the vertical direction, and an oval hole 32 is bored in the water control plate 31. In addition, a water control plate support member 33 is hinged to the water control plate support member mounting portion 20 so as to be rotatable in the left and right direction, and one end of the water control plate support member 33 is attached to a water control plate fixing bin (hereinafter referred to as a fixed pin). A bottle) 34 is attached. This fixed bin 3
4 has the structure shown in Fig. 9, and this Fig. 9(a)
9 is a vertical sectional view of the tip of the water control plate support member showing the identification bin 34 of FIG. 8, and FIG. 9(b) is a sectional view taken along the line A-A of FIG. 9(a'). As shown in FIG. 9, a hole 36 is formed at the tip of the water control plate support member 33, and a convex portion 37 is provided at the middle portion of the inner surface of this hole 36. On the lower surface of this convex portion 37, a ninth hole is formed along the inner circumference of the hole 36.
A slightly downward slope is provided at a protrusion 38 indicated by a broken line in the figure, and the mechanism is such that it is tightened when the fixing pin is rotated. This mechanism supports the water control plate 31 and the water control plate by the friction force between the water control plate fixing pin lower part 39 and the convex portion 37 and the friction force 1 between the water control plate fixing pin head 40 and the water control plate 31. The parts are fixed. A fixing pin pressing plate 42 is installed at the bottom of the tip 35 of the water control plate support member 33 via a spring 41, and the reaction force of this spring 41 prevents the fixing pin 34 from rotating and loosening. It is prevented. The oval hole 32 is bored in the water control plate 31 so that the water control plate fixing bottle head 40 and lower part 39 can pass therethrough.

If it is necessary to fold up the fuel pool water shaking prevention equipment 30, such as during fuel exchange, the identification bin 34 may be pulled and the subsequent steps similar to those of the first embodiment may be performed. Also, when pulling out the fixing pin 34, as shown by the broken line in FIG. 9(b), the long side of the water control plate fixing pin head 40
Twist the fixing pin 34 until it becomes parallel to the side wall of the
Since it is pushed up by 1, it is necessary to lift this fixed pin 3 upwards by 1.
You can pull out 4. Therefore, if you use a tool to remotely rotate this fixing pin 34, the water control plate 31
All operations such as fixing and folding can be performed from the fuel exchange floor 11, improving work efficiency.

Fuel pool water shaking prevention equipment 5 according to the third embodiment of the present invention
0 will be explained with reference to FIG. In addition, FIG. 10 shows a fuel pool water shaking prevention equipment 50 according to a third embodiment of the present invention.
FIG. 4 is a perspective view of the same part as in FIG.

In FIG. 10, the water control plate shown in the first embodiment is a water control plate 51 divided into three parts. Water control board 5 like this
Since the water control plate 1 is divided into parts, the weight of one water control plate is reduced compared to the water control plate shown in the first embodiment, and therefore the operation of folding and restoring the rocking prevention equipment 50 can be performed more easily than in the first embodiment. Become. Further, in this embodiment, an example is shown in which the water control plate fixing pin 23 is used as the coupling member, but the fixing pin shown in the second embodiment may also be used.

〔Effect of the invention〕

The fuel pool equipment according to the present invention can prevent pool water from flowing out due to shaking during an earthquake, improving its health during an earthquake, and furthermore, since workers do not have to clean spilled pool water, it is easier for workers. The possibility of radiation exposure accidents can be significantly reduced. Furthermore, since it is foldable, storage space is not required, and it does not interfere with the work when changing fuel.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a fuel pool facility according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a conventional fuel pool, and FIG. 3 is a perspective view of the fuel pool shown in FIG. 4 is a perspective view of the fuel pool water shaking prevention equipment shown in FIG. 1; FIG. 5 is a longitudinal sectional view of FIG. 4;
FIG. 6 is a schematic cross-sectional view showing the state in which the pool water in the fuel pool equipment shown in FIG. 7(b) is a side view of FIG. 7(a), FIG. 8 is a perspective view of the fuel pool water vibration prevention equipment showing the main part of the second embodiment of the present invention, FIG. 9(a) is a side view of the water control plate fixing bin shown in FIG. 8, FIG. 9(b) is a sectional view taken from the person-to-person arrow in FIG. 9(a), and FIG. 10 is the invention of the present invention. It is a perspective view of the fuel pool water rocking prevention equipment showing the main part of the third embodiment. 10...Fuel pool 17.30.50...One fuel pool water swing prevention equipment...Water control plate attachment part 20...Water control plate support member attachment part 21.31, 51... Water control plate 22.23...Water control plate support member 23...Water control plate fixing pin) 34...Water control plate fixing pin Agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2/ Figure 5 Figure 6 Figure 7 (b) 8 Figure 8 Figure 9

Claims (4)

[Claims] (1) A fuel pool for storing spent fuel and reactor equipment in a nuclear power plant, a water control plate attachment part attached to one upper side wall of this fuel pool, and one vertical part of this water utilization plate attachment part. A water control plate is attached to the water control plate, a water control plate support member is provided at the lower part of the water control plate and hinged in the left and right direction of the fuel pool, and the water control plate support member and the water control plate are detachable. 1. A fuel pool facility characterized by comprising a connecting member that connects two parts. (2) The fuel pool equipment according to claim 1, wherein the connecting member is a water control plate fixing bolt that connects the tip of the water control plate support member and the water utilization plate. (3) Claim 1, characterized in that the connecting member is a fixing pin rotatably attached to the tip of the water control plate support member and fixed to the water control plate in a detachable manner. Fuel pool equipment as described. (4) The water control plate is installed surrounding the fuel pool,
2. The fuel pool equipment according to claim 1, wherein at least one sheet is attached to each side of the fuel pool.