JPH10123278A - Repairing device and method for reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing device and method for reactor capable of conducting the repairing work for reactor in vapor phase space by storing in core structure with high radioactivity in water. SOLUTION: Provided are an isolating wall 1 built on the boundary between a component storage pit 102 and a reactor well 101 for damming up water in the component storage pit 102 and an isolating wall support means 2 having a part touching the isolation wall 1 and a part touching the inner wall of the reactor well. By receiving the hydraulic pressure added on the isolating wall 1 by the water in the component storage pit 102 with the inner wall 106 of the reactor well 101 by way of the isolating wall support means 2, the isolating wall 1 is supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for repairing a nuclear reactor, and more particularly to an apparatus and method for repairing a nuclear reactor for repairing a reactor in a gas phase space.

[0002]

2. Description of the Related Art In the case of inspecting or repairing the inside of a reactor pressure vessel (reactor vessel) during a periodic inspection or the like of a boiling water reactor (BWR), an upper lid of the reactor pressure vessel is opened, The reactor internals need to be taken out of the reactor vessel. At this time, the reactor core, reactor internals, reactor pressure vessel, etc. have extremely high radioactivity, so the reactor well formed on the upper part of the reactor pressure vessel and the equipment storage pit ( Water is injected into the dryer / separator pit) to shield radiation.

[0003] Furnace structures such as a steam dryer (dryer) and a steam separator (separator) taken out of the reactor pressure vessel are stored underwater in an equipment storage pit. The spent fuel removed from the reactor pressure vessel is stored in water in a fuel pool communicating with the reactor well and cooled for a certain period. Here, since the fuel pool is used to cool the spent fuel for a certain period of time, the separation between the reactor well and the fuel pool can be appropriately water-tightly separated by a separating means. The fuel pool can be filled with water even after restarting the operation of the furnace. On the other hand, no means is provided for watertight isolation between the reactor well and the equipment storage pit.

[0004]

As described above, since there is no means for providing watertight isolation between the reactor well and the equipment storage pit, the inside of the reactor well and the reactor pressure vessel are in a gas phase space. In order to perform inspection and repair work inside the reactor, it is necessary to make not only the reactor well but also the equipment storage pit into a gas phase space.

[0005] However, since high-activity internal structures such as a steam dryer and a steam separator are stored in the equipment storage pit, the water in the equipment storage pit is discharged to form a gas phase space. In such a case, there is a problem that the radiation dose on the operation floor becomes extremely high.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a reactor capable of repairing a reactor in a gas phase space while storing a highly radioactive internal structure in water. To provide a repair device and method.

[0007]

According to the first aspect of the present invention, there is provided a repair apparatus for a nuclear reactor, comprising: a reactor well formed above a reactor vessel; and an equipment storage formed adjacent to the reactor well. A reactor repairing apparatus for repairing a reactor having a pit, wherein an isolation wall erected at a boundary between the equipment storage pit and the reactor well to block water in the equipment storage pit. And isolation wall support means having a portion abutting against the isolation wall and a portion abutting against the inner wall surface of the reactor well, wherein the isolation wall is added to the isolation wall by water in the equipment storage pit. The isolation wall is supported by receiving a water pressure on the inner wall surface of the reactor well via the isolation wall support means.

A repair apparatus for a nuclear reactor according to a second aspect of the present invention is characterized in that a watertight seal member is provided at an edge of the isolation wall.

A repair apparatus for a nuclear reactor according to the invention according to claim 3 comprises a reactor well formed above a reactor vessel;
In a reactor repair device for repairing a reactor having an equipment storage pit formed adjacent to the reactor well, the repair device has an inner diameter larger than an outer diameter of a flange portion of the reactor vessel, A cylindrical separator disposed in the reactor well to isolate a space directly above the reactor vessel from the surroundings, and a watertight seal member provided around a lower end of the cylindrical separator. It is characterized by having.

[0010] According to a fourth aspect of the present invention, there is provided a repair apparatus for a nuclear reactor, comprising: a reactor well formed above a reactor vessel;
In a repair apparatus for a reactor for repairing a reactor having an equipment storage pit formed adjacent to the reactor well, the entire reactor internal structure transferred to the equipment storage pit is covered from above. A shielding cover member that is arranged in such a manner as to house the entire furnace internal structure therein and isolate it from the surroundings, and a fluid cover formed between the inside and the outside of the shielding cover member formed below the shielding cover member. An opening for forming a flow path, and valve means provided at an upper portion of the shielding cover member for forming a fluid flow path between the inside and the outside of the shielding cover member as necessary. It is characterized by the following.

According to a fifth aspect of the present invention, in the repair apparatus for a nuclear reactor, a pump means for reducing the pressure inside the shielding cover member is connected to the valve means.

According to a sixth aspect of the present invention, in the repair device for a nuclear reactor, the height of the shield cover member is such that when the shield cover member is disposed in the equipment storage pit, the upper end of the shield cover member is located on the operating floor. It is characterized in that it is set to be at a position higher than the level.

[0013] A repair apparatus for a nuclear reactor according to the invention according to claim 7 comprises: a reactor well formed above a reactor vessel;
In a repair apparatus for a reactor for repairing a reactor having an equipment storage pit formed adjacent to the reactor well, the equipment storage pit is disposed in the equipment storage pit to house a reactor internal structure therein. A shielding container with an open top,
Valve means for providing a fluid flow path between the inside and the outside of the shielding container as needed, provided at a lower portion of the shielding container.

According to an eighth aspect of the present invention, there is provided the repair apparatus for a nuclear reactor, wherein a cylindrical member having the same diameter as the shielding container is detachably and watertightly connected to the upper end of the shielding container.

According to a ninth aspect of the present invention, in the repair apparatus for a nuclear reactor, the height of the shielding container and the cylindrical member may be reduced when the shielding container and the cylindrical member are installed in the equipment storage pit. The upper end of the shaped member is set at a position higher than the level of the operation floor, and a pump means for injecting water into the shielding container is connected to the valve means.

According to a tenth aspect of the present invention, there is provided a method for repairing a nuclear reactor using the repair apparatus for a nuclear reactor according to any one of the first to third aspects.
After injecting water into the reactor well and equipment storage pit,
Transfer the internal structure of the reactor vessel to the equipment storage pit,
The reactor repair device according to any one of claims 1 to 3, wherein the repair device is disposed at a predetermined position, and at least water immediately above the reactor vessel is discharged to form a gas phase space. It is characterized by performing furnace repair work.

A repair method for a nuclear reactor according to the invention according to claim 11 is a method for repairing a nuclear reactor using the repair apparatus for a nuclear reactor according to claim 4, wherein water is supplied to the reactor well and the equipment storage pit. After the injection, the reactor internal structure in the reactor vessel is transferred to the equipment storage pit, and the reactor internal structure is covered by the shielding cover member from above with the valve means opened, and the valve means is opened. From the closed state to the closed state, and at least water in the reactor well and the equipment storage pit is discharged to form a gaseous space, and then repair work of the reactor is performed.

According to a twelfth aspect of the present invention, there is provided a method for repairing a nuclear reactor using the reactor repair apparatus according to the fifth or sixth aspect, wherein the method comprises the steps of: After injecting water into the pit, the reactor internal structure in the reactor vessel is transferred to an equipment storage pit, and the reactor internal structure is covered from above by the shielding cover member with the valve means open, The inside of the shielding cover member is depressurized by pump means, the valve means is switched from an open state to a closed state, and at least water of the reactor well and the equipment storage pit is discharged to form a gas phase space, and then the reactor is closed. It is characterized by performing repair work.

According to a thirteenth aspect of the present invention, there is provided a method for repairing a nuclear reactor using the reactor repair apparatus according to the seventh or eighth aspect, wherein the reactor well and the equipment storage are provided. After injecting water into the pit, the shielding container is disposed in the equipment storage pit with the valve means opened, and the valve means is switched from the open state to the closed state, and the reactor internal structure in the reactor vessel Is transported to the inside of the shielded vessel, and at least water in the reactor well and the equipment storage pit is discharged to form a gaseous space, and then a repair operation of the reactor is performed.

According to a fourteenth aspect of the present invention, there is provided a method for repairing a nuclear reactor using the repair apparatus for a nuclear reactor according to the ninth aspect, wherein the repairing pit is provided in the equipment storage pit without water. Arranging a shielding vessel, transferring the reactor internals in the reactor vessel into the shielding vessel, injecting water into the shielding vessel through the valve means in an open state by the pump means, The valve means is switched from an open state to a closed state, and repair work of the reactor is performed using at least the reactor well and the equipment storage pit as a gas phase space.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, a first embodiment of a reactor repair apparatus and method according to the present invention will be described with reference to FIGS.

FIG. 1 is a plan view showing a state in which the reactor repair apparatus according to the present embodiment is installed at a predetermined position.
FIG. 2 is a longitudinal sectional view taken along line 2-2 of FIG. FIG.
And in FIG. 2, reference numeral 100 indicates a reactor pressure vessel,
The reactor pressure vessel 100 is in a state where an upper lid (not shown) has been removed. A reactor well 101 is formed above the reactor pressure vessel 100, and an equipment storage pit (dryer / separator pit) 102 is formed adjacent to the reactor well 101. A fuel pool 103 is formed beside the reactor well 101, and the fuel pool 103 communicates with the reactor well 101 via a communication passage 104. This communication passage 1
The fuel pool 103 can be closed in a watertight manner by an isolation means (not shown).
From the reactor well 101 in a watertight manner.

The repair apparatus for a nuclear reactor according to the present embodiment has a rectangular isolation wall 1 erected at the boundary between the reactor well 101 and the equipment storage pit 102, and an isolation wall supporting the isolation wall 1. And support means 2. As shown in FIG. 3, watertight seals 3 are attached to both side edges and a lower end edge of the rectangular isolation wall 1.
Is pressed against the floor surface 105 and the side surface of the equipment storage pit 102 to form a watertight seal.

The separating wall supporting means 2 includes a plurality of vertical supporting members 4 erected along the inner wall surface 106 of the reactor well 101 as shown in FIG. 4 support a plurality of horizontal support members 5 in the horizontal direction. These horizontal support members 5 are provided in upper and lower stages, and each stage has a hexagonal planar shape as a whole as shown in FIG. Here, each horizontal support member 5 is disposed so as not to be located directly above the reactor pressure vessel 100, and the reactor pressure vessel 100 passes through a hexagon formed by the plurality of horizontal support members 5. It is configured to be able to. Also, isolation wall 1
Is connected to the horizontal support member 5 by a horizontal connection member 6, and the water pressure applied to the isolation wall 1 by the water in the equipment storage pit 102 is transmitted to the horizontal support member 5 via the horizontal connection member 6. It is configured as follows.

FIGS. 4 (a) and 4 (b) are an enlarged plan view and a side view of a portion B in FIG. 2, and show a connection structure between the vertical support member 4 and the horizontal support member 5. FIG. FIG. 4 (a),
As shown in (b), the vertical support member 4 has a mounting portion 7 projecting therefrom. The mounting portion 7 has two receiving portions 8 on which the ends of the horizontal support member 5 are placed. Is formed. The mounting portion 7 is formed with a metal fitting hole 8, while the horizontal support member 5 is also formed with a metal fitting hole 9. An inverted U-shaped mounting bracket 10 is inserted into these mounting holes 8 and 9 so as to connect the mounting portion 7 of the vertical support member 4 and the end of the horizontal support member.

Next, a procedure for repairing a reactor using the reactor repair apparatus according to the present embodiment will be described. First, the upper lid (not shown) of the reactor pressure vessel 100 is opened, and water is injected into the reactor well 101 and the equipment storage pit 102. Thereafter, the reactor pressure vessel 10
The inside of the furnace, such as a steam separator (not shown), is transferred to the equipment storage pit 102. Then, the isolation wall 1 is erected at the boundary between the reactor well 101 and the equipment storage pit 102, and the inner wall 106 of the reactor well 101 is
A plurality of vertical support members 4 are arranged along. Here, the vertical support member 4 is in contact with the inner wall surface 106 of the reactor well 101 as shown in FIG. Next, each end of the lower horizontal support member 5 is placed on the receiving portion 8 formed on the mounting portion 7 of the vertical support member 4, and the metal mounting hole 8 of the mounting portion 7 and the metal mounting of the horizontal support member 5 are mounted. An inverted U-shaped mounting bracket 10 is inserted into the hole 9 from above. After the vertical support member 4 and the lower horizontal support member 5 are connected in this manner, the upper horizontal support member 5 and the vertical support member 4 are connected in the same procedure. After the vertical support member 4 and the upper and lower horizontal support members 5 are connected in this manner, the isolation wall 1 and the horizontal support member 5 are connected by the horizontal connection member 6.

After the installation of the repair equipment for the nuclear reactor is completed by the above procedure, the water inside the reactor well 101 and the reactor pressure vessel 100 is drained. It is also possible to drain only the reactor well 101 and keep water in the reactor pressure vessel 100. Here, since the reactor well 101 and the equipment storage pit 102 are water-tightly isolated by the isolation wall 1 having the watertight seal member 3, even if the water in the reactor well 101 is discharged, the equipment storage pit is not affected. The water in 102 is maintained without flowing out to the reactor well 101 side. When the inside of the reactor well 101 becomes a gas phase space, water pressure due to water in the equipment storage pit 102 is applied to the isolation wall 1, and this water pressure is transmitted to the horizontal support member 5 via the horizontal connecting member 6. Further, the water pressure transmitted to the horizontal support member 5 is transmitted to the vertical support member 4, but since the vertical support member 4 is in contact with the inner wall surface 106 of the reactor well 101, the equipment storage pit 1
The force due to the water pressure inside 02 is the inner wall 1 of the reactor well 101.
06 will be accepted. Therefore,
The isolation wall 1 does not fall due to the water pressure from the equipment storage pit 102.

After the interior of the reactor well 101 and the reactor pressure vessel 100 is made into a gas phase space by the above-described procedure, the repair work of the reactor inside the reactor pressure vessel 100 and the reactor pressure vessel 100 are performed. Carry out repair work for the reactor, such as replacement of the reactor itself. Here, since each horizontal support member 5 is arranged in a hexagon so as not to be located directly above the reactor pressure vessel 100, it is formed by the horizontal support member 5 in the replacement operation of the reactor pressure vessel 100. The reactor pressure vessel 100 can be unloaded or loaded via the inside of the hexagon.

When all the predetermined repair work is completed, the removal work of the repair equipment of the nuclear reactor is started. This removal work is performed in the reverse order of the above-described installation work. That is,
After water is injected into the reactor pressure vessel 100 and the reactor well 101, the horizontal connecting member 6 connecting the isolation wall 1 and the horizontal support member 5 is removed. Next, the mounting bracket 10 is removed, the horizontal support member 5 is removed from the vertical support member 4, and the vertical support member 4 is pulled up from the reactor well 101. Finally, reactor well 101 and equipment storage pit 1
02, the separating wall 1 standing upright is removed, and the removing operation is completed.

As described above, according to the apparatus and method for repairing a nuclear reactor according to the present embodiment, the interior of the reactor well 101 and the reactor pressure vessel 100 are vapor Since the internal structure of the reactor can be used as a space, the internal structure of the reactor having a high radioactivity can be stored underwater in the equipment storage pit 102 to shield radiation, while repair work inside the reactor pressure vessel 100 and the reactor pressure vessel 10 can be performed.
Repair work of the nuclear reactor such as replacement work of the reactor 0 itself can be performed in the gas phase space, so that the efficiency of these works is greatly improved.

Second Embodiment Next, a second embodiment of the apparatus and method for repairing a nuclear reactor according to the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 5 is a plan view showing a state in which the reactor repair apparatus according to the present embodiment is installed at a predetermined position.
FIG. 6 is a longitudinal sectional view taken along line 6-6 in FIG. FIG.
As shown in FIG. 6 and FIG. 6, the repair apparatus for a nuclear reactor according to the present embodiment includes a cylindrical separator 20, which is larger than the outer diameter of the flange 107 of the reactor pressure vessel 100. Also have a large inner diameter. This cylindrical separator 20
As shown in FIG.
The watertight seal member 21 is in contact with the floor surface 108 of the reactor well 101 to form a watertight seal.

Next, a procedure for repairing a nuclear reactor using the reactor repair apparatus according to the present embodiment will be described. First, the upper lid (not shown) of the reactor pressure vessel 100 is opened, and water is injected into the reactor well 101 and the equipment storage pit 102. Thereafter, the reactor pressure vessel 10
The inside of the furnace, such as a steam separator (not shown), is transferred to the equipment storage pit 102. Then, the tubular separator 20 is installed in the reactor well 101, and the watertight seal member 21 at the lower end of the tubular separator 20 contacts the floor surface 108 of the reactor well 101 to form a watertight seal. .

When the repair device for the reactor is installed in the reactor well 101 in this manner, the water inside the reactor pressure vessel 100 and the cylindrical separator 20 is discharged. Here, since the inside of the tubular separator 20 and the device storage pit 102 are watertightly separated by the partition wall 1 having the watertight seal member 21, the water in the tubular separator 20 is discharged. Also,
The water in the equipment storage pit 102 is maintained without being discharged.

Then, according to the above procedure, the cylindrical separator 2
0 (that is, just above the reactor pressure vessel 100) and the interior of the reactor pressure vessel 100 are gas-phase spaces, while the water inside the equipment storage pit 102 and around the cylindrical separator 20 is left as it is. In addition, repair work of the reactor inside the reactor pressure vessel 100 and replacement work of the reactor pressure vessel 100 itself are performed. Here, since the cylindrical separator 20 has an inner diameter larger than the outer diameter of the flange portion 107 of the reactor pressure vessel 100, the inside of the cylindrical separator 20 is The reactor pressure vessel 100 can be unloaded or loaded via the.

When all the predetermined repair work is completed, the removal work of the repair equipment of the nuclear reactor is started. This removal work is performed in the reverse order of the installation work described above. That is,
After water is injected into the reactor pressure vessel 100 and the cylindrical separator 20, the cylindrical separator 20 is pulled up from the reactor well 101 and removed.

As described above, according to the apparatus and method for repairing a nuclear reactor according to the present embodiment, the inside and upper part of the reactor pressure vessel 100 are kept in the gas space while the water is held inside the equipment storage pit 102. Therefore, while the reactor internal structure having high radioactivity is stored in water in the equipment storage pit 102 to shield the radiation, repair work inside the reactor pressure vessel 100 and the reactor pressure vessel 100 itself can be performed. Repair work of the reactor such as replacement work can be performed in the gas phase space, and therefore, the efficiency of these works is greatly improved.

Third Embodiment Next, a third embodiment of the reactor repair apparatus and method according to the present invention will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 8 is a longitudinal sectional view showing a state where the repair apparatus for a nuclear reactor according to the present embodiment is installed at a predetermined position. As shown in FIG. 8, the repair apparatus for a nuclear reactor according to the present embodiment includes a shielding cover installed so as to cover the entire steam-water separator 109 and the steam dryer 110 transferred to the equipment storage pit 102 from above. A member 30 is provided. When the shielding cover member 30 is installed on the floor surface 105 of the equipment storage pit 102, its upper end is at a position higher than the level of the operation floor 111.

At the lower end of the shielding cover member 30, a notch (opening) 31 for forming a fluid flow path between the inside and the outside of the shielding cover member 30 is provided.
The height of 1 is between the equipment storage pit 102 and the reactor well 10.
The height is set to be lower than the height of the step 112 at the boundary portion with the first. In addition, a valve 32 for forming a fluid flow path between the inside and the outside of the shielding cover member 30 as necessary is provided above the shielding cover member 30. A pump 33 for injecting or discharging a fluid such as air into the shielding cover member 30 is connected via a pipe 34.

Next, a procedure for repairing a nuclear reactor using the reactor repair apparatus according to the present embodiment will be described. First, the upper lid (not shown) of the reactor pressure vessel 100 is opened, and water is injected into the reactor well 101 and the equipment storage pit 102. Thereafter, the reactor pressure vessel 10
0 steam-water separator 109 and steam dryer 110
Is transferred to the equipment storage pit 102. Then, the shield cover member 30 is put on the steam-water separator 109 and the steam dryer 110 from above, and the shield cover member 30 is placed on the floor surface 105 of the equipment storage pit 102. Here, the steam separator 10
When the shielding cover member 30 is put on the steam dryer 9 and the steam dryer 110, the valve 32 is opened and the pump 33
As a result, air inside the shielding cover member 30 is exhausted. In this manner, the shield cover member 30 can be quickly installed in the water in the equipment storage pit 102, and the water level in the shield cover member 30 can be controlled by the operation floor 1.
The position can be higher than the eleventh level.

As described above, the entire steam-water separator 109 and the steam dryer 110 are housed inside the shielding cover member 30 to be isolated from the surroundings, and when the water level in the shielding cover member 30 reaches a predetermined position, The valve 32 is switched from the open state to the closed state.

Next, the water inside the equipment storage pit 102, the reactor well 101, and the reactor pressure vessel 100 is drained. At this time, the water level in the equipment storage pit 102 does not drop below the height of the notch 31. To Here, since the valve 32 is closed, the inside of the shielding cover member 30 is airtight, and the pressure inside the shielding cover member 30 is lower than the external pressure. The water level in the shielding cover member 30 is maintained at a high position.

According to the above procedure, the inside of the reactor well 101 and the reactor pressure vessel 100 is made into a gas phase space. And repair work of the reactor such as replacement work of the reactor pressure vessel 100 itself.

When all the predetermined repair work is completed, water is injected into the reactor pressure vessel 100, the reactor well 101, and the equipment storage pit 102. Then, the valve 32 provided above the shielding cover member 30 is opened, and air is introduced into the shielding cover member 30 via the valve 32. After eliminating the pressure difference between the inside and the outside of the shielding cover member 30 in this way, the shielding cover member 30 is pulled up from the device storage pit 102.

As described above, according to the reactor repairing apparatus and method according to the present embodiment, the reactor pressure vessel 10 is maintained while the inside of the shielding cover member 30 is filled with water.
0 and the reactor well 101 can be made into a gas phase space, so that the reactor internal structure having high radioactivity is stored in water in the shielding cover member 30 to shield radiation while the reactor pressure vessel 100 It is possible to perform repair work on the reactor, such as repair work inside the reactor and replacement work of the reactor pressure vessel 100 itself, in the gas phase space.
The efficiency of these operations is greatly improved. Further, since the radiation can be shielded by the shielding cover member 30 itself, the radiation can be effectively shielded in combination with the shielding effect of the water in the shielding cover member 30.

The upper end of the shield cover member 30 is located at a position higher than the level of the operation floor 111, and the water level in the shield cover member 30 is controlled by the pump 33.
1, the steam-water separator 109 and the steam dryer 110 as shown in FIG.
Can be stored in a stack. For this reason,
Floor 10 of equipment storage pit 102 used for storage
5 can be reduced, and the equipment storage pit 10
2 can be used effectively.

Modification As a modification of the present embodiment, the shielding cover member 30 can be installed at a place other than the floor surface 105 of the equipment storage pit 102. That is, the floor 1 of the equipment storage pit 102
Even if it is a place other than 05, it can be installed as long as it can maintain a water level where the notch 31 below the shielding cover member 30 is not exposed.

As described above, the installation place of the shielding cover member 30 is not limited to the floor surface 105 of the equipment storage pit 102, so that the storage place of the furnace internal structure can be increased.

Fourth Embodiment Next, a fourth embodiment of the apparatus and method for repairing a nuclear reactor according to the present invention will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 9 is a longitudinal sectional view showing a state where the repair device for a nuclear reactor according to the present embodiment is installed at a predetermined position. As shown in FIG. 9, the repair apparatus for a nuclear reactor according to the present embodiment includes a shielding container 40 placed on the floor surface 105 of the equipment storage pit 102, and the upper surface of the shielding container 40 is open. . A cylindrical member 41 of the same diameter is detachably connected to the upper end of the shielding container 40, and the connected portion is water-tightly sealed by a water-tight seal member 42. Here, the upper end of the cylindrical member 41 is at a position higher than the level of the operation floor 111 as shown in FIG.

Further, a valve 43 for forming a fluid flow path between the inside and the outside of the shielding container 40 as necessary is provided below the shielding container 40.
3 is connected via a pipe 45 to a pump 44 for injecting or discharging water inside the shielding container 40.

Next, a procedure for repairing a reactor using the reactor repair apparatus according to the present embodiment will be described. First, the upper lid (not shown) of the reactor pressure vessel 100 is opened, and water is injected into the reactor well 101 and the equipment storage pit 102. Then, the equipment storage pit 10
The shielding container 40 and the cylindrical member 41 are installed on the floor surface of No. 2.
At this time, the valve 43 below the shielding container 40 is opened, and the pump 44 is driven to inject water into the shielding container 40 and the cylindrical member 41. By performing the installation work while pouring water into the shielding container 40 and the cylindrical member 41 in this manner, the shielding container 40 and the cylindrical member 41 can be quickly installed in the water of the device storage pit 102.

When the shielding container 40 and the cylindrical member 41 are set on the floor 105 of the equipment storage pit 102, the valve 43 is closed. Then, the steam-water separator 109 and the steam dryer 110 inside the reactor pressure vessel 100 are transferred to the inside of the shielding vessel 40 and the cylindrical member 41 and stored in water. Here, when the furnace internal structure is stored in the shielding container 40 and the cylindrical member 41 and the upper part of the furnace internal structure comes out above the water surface, the valve 43 is opened again and the water is supplied from the pump 44. So that the entire furnace internals are submerged. Next, the equipment storage pit 102, the reactor well 101
Then, water inside the reactor pressure vessel 100 is discharged to form a gas phase space.

In this manner, the steam-water separator 109 and the steam dryer 110 are stored in the shielding vessel 40 and the cylindrical member 41 in the water, and the inside of the reactor well 101 and the reactor pressure vessel 100 is used as a gas phase space. Furnace pressure vessel 10
0 repair work inside the reactor pressure vessel 10
Perform repair work on the nuclear reactor, such as replacement work of the 0 itself. When the predetermined repair work is completed, the steam-water separator 109 and the steam dryer 110 stored in the shielding vessel 40 and the cylindrical member 41 are transferred into the reactor pressure vessel 100, and the inside of the shielding vessel 40 and the cylindrical member 41 are transferred. Then, the shielding container 40 and the cylindrical member 41 are pulled up from the equipment storage pit 102 and removed.

As described above, according to the apparatus and method for repairing a nuclear reactor according to the present embodiment, the steam-water separator 109 and the steam dryer 110 having high radioactivity are stored underwater in the shielding vessel 40 and the cylindrical member 41. , Equipment storage pit 102,
Since the work can be performed while the inside of the reactor well 101 and the reactor pressure vessel 100 is used as a gas phase space, the repair work inside the reactor pressure vessel 100 and the replacement work of the reactor pressure vessel 100 itself can be performed. Furnace repair operations can be performed in the gas space, thus greatly improving the efficiency of these operations. Further, since the radiation can be shielded by the shielding container 40 and the cylindrical member 41 itself, the radiation can be effectively shielded in combination with the shielding effect by water.

The upper end of the cylindrical member 41 is connected to the operation floor 111.
And the pump 44 controls the water level of the shielding container 40 and the cylindrical member 41 by the operation floor 1.
Since it can be higher than the 11th level,
As shown in FIG. 9, steam-water separator 109 and steam dryer 11
0 can be stacked and stored. Therefore, the area of the floor surface 105 of the device storage pit 102 used for storage can be reduced, and the device storage pit 102 can be used effectively.

Further, in the repair apparatus for a nuclear reactor according to the present embodiment, the cylindrical member 41 is connected to the upper part of the shielding vessel 40 in a watertight manner, so that the water level for storing the internal structure of the reactor is required. Can be raised accordingly.

First Modification As a first modification of the present embodiment, when the shielding container 40 and the cylindrical member 41 are installed on the floor surface 105 of the equipment storage pit 102, the equipment storage pit 102 is in a gas phase space. Can also. In this case, the shielding container 40 and the cylindrical member 4
After installing 1 on the floor 105 of the equipment storage pit 102,
The steam separator 109 and the steam dryer 110 inside the reactor pressure vessel 100 are transferred into the shield vessel 40 and the cylindrical member 41. Next, water is injected into the shielding container 40 and the cylindrical member 41 by the pump 44 through the valve 43 in the open state, and the steam-water separator 109 and the steam dryer 11
Raise the water level until the entire zero is flooded. When the entire steam-water separator 109 and the steam dryer 110 are submerged, the valve 43 is switched from the open state to the closed state, the steam-water separator 109 and the steam dryer 110 are stored in water, and a predetermined repair work of the nuclear reactor is performed. Is carried out.

Second Modification As a second modification of the present embodiment, a switching valve is used as the valve 43, and this switching valve is used in addition to the two states of the state of being connected to the pump 44 and the state of being completely closed. Thus, a state where the inside and the outside of the shielding container 40 communicate with each other can be achieved.

When the shielding container 40 and the cylindrical member 41 are installed in the equipment storage pit 102 filled with water, the inside and the outside of the shielding container 40 are communicated by the valve 43. If you do this,
Since the water in the equipment storage pit 102 flows into the shielding container 40 via the valve 43, it is not necessary to forcibly inject the water into the shielding container 40 by the pump 44. After the shield container 40 and the cylindrical member 41 are installed in the equipment storage pit 102, the valve 43 is switched to inject water from the pump 44, so that the water level in the shield container 40 and the cylindrical member 41 can be increased. .

Third Modification As a third modification of the present embodiment, the shielding container 40 and the cylindrical member 41 can be installed at a place other than the floor surface 105 of the equipment storage pit 102. That is, in the repair apparatus for a nuclear reactor according to the present embodiment, water is injected into the shield container 40 and the cylindrical member 41 by the pump 44. And the cylindrical member 41 can be installed.

As described above, the shielding container 40 and the cylindrical member 41
Is not limited to the floor 105 of the equipment storage pit 102, so that the number of storage locations for the furnace internals can be increased.

[0064]

As described above, according to the apparatus and method for repairing a nuclear reactor according to the present invention, the inside of the reactor well and the interior of the nuclear reactor vessel are maintained while the reactor internal structure having high radioactivity is stored in water. Because it can be in a phase space, the work efficiency can be greatly improved by performing repair work inside the reactor vessel and replacing the reactor vessel itself, etc., in the gas phase space. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state where a repair apparatus for a nuclear reactor according to a first embodiment of the present invention is installed at a predetermined position.

FIG. 2 is a longitudinal sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged longitudinal sectional view of a portion A in FIG. 2;

4A is an enlarged plan view of a portion B in FIG. 2, FIG.
3 is an enlarged side view of a portion B in FIG. 2.

FIG. 5 is a plan view showing a state where a repair device for a nuclear reactor according to a second embodiment of the present invention is installed at a predetermined position.

FIG. 6 is a vertical sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is an enlarged longitudinal sectional view of a portion C in FIG. 6;

FIG. 8 is a longitudinal sectional view showing a state where a repair device for a nuclear reactor according to a third embodiment of the present invention is installed at a predetermined position.

FIG. 9 is a longitudinal sectional view showing a state where a repair device for a nuclear reactor according to a fourth embodiment of the present invention is installed at a predetermined position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Isolation wall 2 Isolation wall support means 3, 21, 42 Watertight seal member 4 Vertical support member 5 Horizontal support member 6 Horizontal connection member 20 Cylindrical separator 30 Shield cover member 31 Notch 32, 43 Valve 33, 44 Pump 40 Shield Vessel 41 Cylindrical member 100 Reactor pressure vessel 101 Reactor well 102 Equipment storage pit 103 Fuel pool 106 Inner wall surface of reactor well 109 Steam separator 110 Steam dryer 111 Operation floor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuhiko Sato, Inventor 8 at Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Yokohama office (72) Inventor Yutaka Togasawa 8, Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Address Toshiba Yokohama Works (72) Inventor Koshio Igarashi 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Prefecture 72 Toshiba Yokohama Works (72) Inventor Mitsuaki Shimamura Shinsugita-machi, Isogo-ku, Yokohama, Kanagawa No. 8 In the Toshiba Yokohama Office (72) Inventor Yasuhiro Yuguchi 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa In the Toshiba Yokohama Office

Claims (14)

[Claims] A reactor repair apparatus for repairing a reactor having a reactor well formed above a reactor vessel and an equipment storage pit formed adjacent to the reactor well. An isolation wall erected at a boundary between the equipment storage pit and the reactor well for damping water in the equipment storage pit; and a portion abutting on the isolation wall and inside the reactor well. Isolation wall support means having a portion abutting against a wall surface, wherein water pressure applied to the isolation wall by water in the equipment storage pit is applied to the inner wall surface of the reactor well via the isolation wall support means. A repair device for a nuclear reactor, wherein the isolation wall is supported by receiving the same. 2. A repair apparatus for a nuclear reactor according to claim 1, wherein a watertight seal member is provided at an edge of said isolation wall. 3. A reactor repair apparatus for repairing a reactor having a reactor well formed above a reactor vessel and an equipment storage pit formed adjacent to the reactor well. A cylindrical isolator having an inner diameter larger than the outer diameter of the flange portion of the reactor vessel, and disposed in the reactor well to isolate a space directly above the reactor vessel from surroundings; A repair device for a nuclear reactor, comprising: a watertight seal member provided around a lower end portion of the cylindrical separator. 4. A reactor repair apparatus for repairing a reactor having a reactor well formed above a reactor vessel and an equipment storage pit formed adjacent to the reactor well. A shielding cover member that is arranged so as to cover the entire furnace internal structure transferred to the equipment storage pit from above, and that houses the entire furnace internal structure therein to isolate it from the surroundings; An opening formed at a lower portion of the shield cover member to form a fluid flow path between the inside and the outside of the shield cover member, and provided at an upper portion of the shield cover member, between the inside and the outside of the shield cover member. A repair device for a nuclear reactor, comprising: valve means for forming a fluid flow path as required. 5. A repair apparatus for a nuclear reactor according to claim 4, wherein pump means for reducing the pressure inside said shielding cover member is connected to said valve means. 6. The height of the shielding cover member is set such that the upper end of the shielding cover member is located at a position higher than the level of the operation floor when the shielding cover member is disposed in the equipment storage pit. The repair device for a nuclear reactor according to claim 5, wherein 7. A reactor repair apparatus for repairing a reactor having a reactor well formed above a reactor vessel and an equipment storage pit formed adjacent to the reactor well. A shielding container having an open upper surface, which is disposed in the equipment storage pit for storing the furnace internals therein; provided at a lower portion of the shielding container, between the inside and the outside of the shielding container. A repair device for a nuclear reactor, comprising: valve means for forming a fluid flow path as required. 8. The repair apparatus for a nuclear reactor according to claim 7, wherein a cylindrical member having the same diameter as the shielding container is detachably and watertightly connected to an upper end of the shielding container. 9. The height of the shielding container and the cylindrical member is as follows:
When the shielding container and the cylindrical member are installed in the equipment storage pit, the upper end of the cylindrical member is set at a position higher than the level of the operation floor, and the valve means includes the shielding container. 9. A repair apparatus for a nuclear reactor according to claim 8, wherein pump means for injecting water into the interior of the reactor are connected. 10. A method for repairing a reactor using the repair apparatus for a reactor according to claim 1, wherein water is injected into the reactor well and the equipment storage pit. rear,
Transfer the internal structure of the reactor vessel to the equipment storage pit,
The reactor repair device according to any one of claims 1 to 3, wherein the repair device is disposed at a predetermined position, and at least water immediately above the reactor vessel is discharged to form a gas phase space. A method for repairing a nuclear reactor, comprising repairing the reactor. 11. A method for repairing a nuclear reactor using the repair apparatus for a nuclear reactor according to claim 4, wherein water is injected into the reactor well and the equipment storage pit.
Transfer the internal structure of the reactor vessel to the equipment storage pit,
With the valve means opened, the reactor internal structure is covered from above by the shielding cover member, the valve means is switched from the open state to the closed state, and at least the water in the reactor well and the equipment storage pit is discharged. A method for repairing a nuclear reactor, comprising performing repair work on the nuclear reactor after the space has been converted to a gas phase space. 12. A method for repairing a nuclear reactor using the repair equipment for a nuclear reactor according to claim 5 or 6, wherein water is injected into the reactor well and the equipment storage pit.
Transfer the internal structure of the reactor vessel to the equipment storage pit,
In the state in which the valve means is opened, the inside of the furnace is covered with the shielding cover member from above, the inside of the shielding cover member is depressurized by the pump means, and the valve means is switched from the open state to the closed state. A method for repairing a nuclear reactor, comprising performing a repair work on a nuclear reactor after draining water from the reactor well and the equipment storage pit to form a gas phase space. 13. A method for repairing a nuclear reactor using the repair equipment for a nuclear reactor according to claim 7 or 8, wherein water is injected into the reactor well and the equipment storage pit.
With the valve means open, the shielding vessel is placed in the equipment storage pit, the valve means is switched from the open state to the closed state, and the internal structure in the reactor vessel is transferred to the inside of the shielding vessel. A method for repairing a nuclear reactor, wherein the repair work of the nuclear reactor is performed after at least water in the reactor well and the equipment storage pit is drained to form a gas space. 14. A method for repairing a nuclear reactor using the repair equipment for a nuclear reactor according to claim 9, wherein the shielding vessel is disposed in the equipment storage pit in a state where there is no water, and the reactor in the reactor vessel is provided. Transferring the internal structure into the shielding container, injecting water into the shielding container through the valve means in an open state by the pump means, switching the valve means from an open state to a closed state, A method for repairing a nuclear reactor, wherein repair work of the nuclear reactor is performed using the reactor well and the equipment storage pit as a gas space.