JP2000028776A - In-reactor steam dryer and storage structure of steam separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compactly house in a pool for storage a steam dryer and a steam separator being in-reactor structures in the pressure vessel of reactor power station. SOLUTION: The upper end part of a suspension member 6 is fixed to the upper edge of pool for storage 3, and a frame 7 is fixed to the lower end of the suspension member 6, which is arranged horizontally along the wall in the middle depth in the pool 3 for storage. A steam separator 1 is guided to positioning pins 4 at the bottom of the pool 3 for storage to be placed and guided to rods 5 extended from the positioning pins 4, and the flange part 9 of the steam dryer 8 is placed on the frame 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for removing a steam-water separator and a steam dryer arranged inside a pressure vessel of a nuclear power plant from a furnace and storing the steam-water separator and a steam dryer in a storage pool.

[0002]

2. Description of the Related Art A shroud is provided inside a pressure vessel of a nuclear power plant from a lower side. A shroud head is provided at the upper end of the shroud via a flange. A steam-water separator communicates with the shroud head. A steam dryer is arranged above the water separator, and the lower side of the casing of the steam dryer covers the outer periphery of the steam separator. In such a nuclear reactor, for example, when it becomes necessary to replace the shroud itself or its parts, it is necessary to store the removed shroud in a storage pool in the power plant because it is contaminated with radioactive material.

[0003]

However, in order to replace the shroud, it is necessary to simultaneously remove the steam dryer and the steam separator disposed above the shroud and store them in the same storage pool. There is. However, in a pool of a power plant, there is a case where a pool for storage having a plane size enough to store all of them cannot be secured. Therefore, the present invention provides a storage structure that can effectively use the storage pool in a nuclear power plant, thereby securing a large space in the storage pool so that, for example, various parts of the shroud or the shroud itself can be repaired and inspected. The task is to

[0004]

SUMMARY OF THE INVENTION The storage structure of the in-furnace steam dryer and the steam / water separator according to the present invention is adapted to be aligned with a pair of spaced-apart reference recesses 2 on the outer peripheral edge of the steam / water separator 1.
A pair of positioning pins 4 erected and fixed to the bottom surface of the storage pool 3, a rod 5 having a lower end connected to the positioning pins 4, and an upper end fixed to an upper edge of the storage pool 3, respectively. Then, a plurality of hanging members 6 hanging therefrom along the wall surface, and fixed to the lower end of each hanging member 6,
A frame 7 disposed horizontally along a wall of an intermediate depth of the storage pool 3, wherein the steam-water separator 1 taken out of the furnace has the reference recess 2 and the positioning pin 4 is supported at the bottom of the storage pool 3, and the upper part of the steam-water separator 1 is covered with the lower part of the steam dryer 8 taken out of the furnace. The reference recess 10 of the outer peripheral flange 9 is aligned with the rod 5, and the flange 9 is placed on the frame 7.

[0005] According to this structure, the steam dryer 8 is supported by the frame 7 disposed in the middle of the storage pool 3, and the steam separator 1 can be disposed below the steam dryer. That is, the space in the storage pool 3 can be effectively used, the steam-water separator 1 and the steam dryer 8 can be stored in a two-tiered configuration, and other parts of the storage pool 3 can be widely used. . Moreover, the steam dryer 8 and the steam separator 1 are provided with the positioning pins 4.
In addition, since they are positioned via the rod 5, the same arrangement can be performed when they are overlapped in the furnace, and it is possible to store them while preventing the parts of the two from being damaged by contact. Become. Next, according to a second aspect of the present invention, in the first aspect, the upper end of the rod 5 is provided with the frame 7.
1 is a storage structure of an in-furnace steam dryer and a steam-water separator fixed to the furnace.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a partially cutaway elevational view of the storage structure of the present invention, FIG. 2 is a view taken in the direction of arrows II-II in FIG. 1, FIG. 3 is an elevational view of a steam dryer 8, and FIG. Elevation view, FIG. 5
FIG. 6 is a plan view of the suspending member 6, and FIG.
As shown in FIG. 4, the steam-water separator 1 has a plurality of stand pipes 14 whose lower ends penetrate through a shroud head 13 and whose penetrations are fixed by welding. A flange portion is formed on the peripheral edge of the shroud head 13, and a pair of metal fittings 2a protrude from the outer diameter line of the flange portion as shown in FIG. 2, and the tip of the metal fitting 2a is cut off in a U-shape. Has a reference recess 2. Next, the steam dryer 8 has a lower casing 8b and an upper casing 8a.
Are protruded annularly. In the upper casing 8a,
Many fins (not shown) for steam drying are provided. The inside of the lower casing 8b is formed as a cavity, and the lower casing 8b covers the upper portion of the steam separator 1 in the furnace.

FIG. 1 shows a flange 9 of the steam dryer 8.
As shown in the figure, a reference recess 10 (the right one is omitted) is formed on the diameter line. This reference recess 10 has a cutout having a U-shaped plane as in the case of the reference recess 2 of the steam separator 1 in FIG. At the upper ends of the steam dryer 8 and the steam separator 1, hanging ears 11 are protruded, respectively. Next, in the storage pool 3 in which the steam dryer 8 and the steam separator 1 are stored, a pair of positioning pins 4 are erected on the bottom thereof via an appropriate anchor. The position of the positioning pin 4 matches the reference recess 2 of the metal fitting 2 a of the steam separator 1.
The metal fitting 2a is a shroud head of the steam separator 1.
A pair is provided on 13 diameter lines.

Next, the upper end of the suspension member 6 is fixed to the upper edge of the storage pool 3. As shown in FIGS. 1 and 5, the hanging member 6 includes a frame-shaped upper frame 6a having an open end, and a vertical member 6b hanging down along at least the four corners along the storage pool 3. At four corners of the upper frame 6a, mounting arms extend in the horizontal direction, and the arms are fixed to the upper surface of the storage pool 3. The frame 7 is fixed to the lower end of the suspension member 6. The frame 7 is formed in a square frame shape as shown in FIG. 6, and the flange portion 9 of the steam dryer 8 is placed on the upper surface of the frame. The bar 5 is fixed to the pair of opposed beams of the frame 7 via the mounting bracket 5a. The lower end of the rod 5 is connected to the upper end of the positioning pin 4 as shown in FIG.

[0009]

Next, the storage sequence of the steam dryer 8 and the steam separator 1 will be described. First, the steam dryer 8 taken out from the upper part inside the pressure vessel is temporarily temporarily placed at an appropriate position in the storage pool 3. The steam separator 1 is then lifted and sunk into the bottom of the storage pool 3 so that its reference recess 2 is aligned with the positioning pin 4. Next, the hanging member 6 and the frame 7 are assembled, and the lower end of the rod 5 is fitted to the upper end of the positioning pin 4. Then, the upper end of the rod 5 is fixed to the frame 7 via the mounting bracket 5a as shown in FIG. Next, the steam dryer 8 is lifted from another place of the storage pool 3, and is suspended so that the reference recess 10 provided in the flange portion 9 is aligned with the upper end of the rod 5. It is placed on the frame 7. The lower casing 8b of the steam dryer 8 is
Fit the upper part of. The reference recess 2 of the steam-water separator 1 and the reference recess 10 of the steam dryer 8 are each used for inserting a shroud head bolt inside the pressure vessel.
In this way, the steam-water separator 1 and the steam dryer 8 are overlapped in the storage pool 3 so that the storage pool can be effectively used. Therefore, the shroud, which is an in-furnace structure, can be placed in an empty space in the storage pool, and it can be inspected and maintained or its parts can be replaced.

[0010]

According to the storage structure of the in-furnace steam dryer and the steam / water separator of the present invention, the steam dryer 8 is supported by the frame 7 arranged in the middle part of the storage pool 3, and the steam Since the separator 1 is arranged, the space in the storage pool 3 can be effectively used, and the steam-water separator 1 and the steam dryer 8 can be stored in a two-tiered configuration. Therefore, other portions of the storage pool 3 can be widely used. Moreover, since the steam dryer 8 and the steam separator 1 are positioned via the positioning pins 4 and the rods 5, the same arrangement can be performed when they are overlapped in the furnace. Parts can be stored while being prevented from being damaged by contact.

[Brief description of the drawings]

FIG. 1 is a partially cutaway elevational view of a storage structure of an in-furnace steam dryer and a steam separator of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is an elevation view of the steam dryer 8 having the same structure.

FIG. 4 is an elevation view of the steam separator 1 having the same structure.

FIG. 5 is a plan view of the suspension member 6 having the same structure.

FIG. 6 is a plan view of a frame 7 having the same structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steam separator 2 Reference recess 2a Metal fitting 3 Storage pool 4 Positioning pin 5 Rod 5a Mounting bracket 6 Hanging member 6a Upper frame 6b Vertical member 7 Frame 8 Steam dryer 8a Upper casing 8b Lower casing 9 Flange 10 Reference recess 11 Hanging ear 13 Shroud head 14 Stand pipe

Claims (2)

[Claims] 1. A pair of positioning pins 4 erected and fixed on the bottom surface of a storage pool 3 so as to be aligned with a pair of spaced-apart reference recesses 2 on the outer peripheral edge of the steam separator 1. A plurality of hanging members 6 each having an upper end fixed to an upper edge of the storage pool 3 and hanging down along the wall surface thereof; A frame 7 fixed to the lower end of the suspending member 6 and arranged horizontally along a wall of an intermediate depth of the storage pool 3, wherein the steam-water separator 1 taken out of the furnace is The lower part of the steam dryer 8 taken out of the furnace is supported on the bottom of the storage pool 3 by aligning the reference recess 2 with the positioning pin 4 so as to cover the upper part of the steam separator 1. The reference recess 10 of the flange portion 9 on the outer periphery of the steam dryer 8 is Matching to, configured furnace steam dryer and storage structure of the steam-water separator as is placed on the flange portion 9 is the frame 7. 2. The storage structure for an in-furnace steam dryer and a steam-water separator according to claim 1, wherein the upper end of the rod 5 is fixed to the frame 7.