JPH08297189A - Heat insulating material for reactor pressure vessel support skirt - Google Patents

Abstract

PURPOSE: To provide a heat insulating material portion having a simple structure, surely avoiding the interference with an inspecting device, and requiring no removing/fitting process by making the heat insulating material portion located in the operating area of the inspecting device movable to the outside from the operating area. CONSTITUTION: A support skirt 2 located on the outside of a reactor pressure vessel 1, a heat insulating material 3, the operating area 4 of an inspecting device, and a weld section 5 are provided. A heat insulating material portion 3a is provided partially and vertically movably by a pulley 7 as shown by an arrow 9. The heat insulating material portion 3a is moved upward at the time of a periodic inspection, and the interference with the inspecting device can be avoided. When the reactor pressure vessel 1 is operated after the inspection, the heat insulating material portion 3a is lowered to the original position, and it is used for heat insulation with no trouble.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material for a reactor pressure vessel support skirt.

[0002]

2. Description of the Related Art A conventional reactor pressure vessel support skirt and its heat insulating material are constructed as shown in FIG. In FIG. 3, 21 is a reactor pressure vessel, 22 is a support skirt, 23 is a heat insulating material, 24 is an operating range of an inspection device described later, 25 is a welded portion between the pressure vessel 21 and the support skirt 22, and 26 is an inspection. For pole truck.

That is, a heat insulating material 23 is provided to prevent the heat inside the reactor of the reactor pressure vessel 21 from escaping to the outside.
Since the reactor pressure vessel 21 and the support skirt 22 are welded at the welded portion 25,
Periodic inspection and the like are required, and at the time of these inspections, the inspection device passes through the operating range 24 surrounded by a broken line.

As described above, when the inspection device is operated, the heat insulating material portion 23a of the heat insulating material 23 located in the operating range 24 interferes with the inspection device. Conventionally, since the heat insulation by the heat insulation material 23 is not required during the above-mentioned inspection, a detachable structure such as a buckle has been used.

[0005]

However, the heat insulating material of the conventional reactor pressure vessel support skirt described above must have a structure in which the heat insulating material portion 23a located in the operating range 24 can be removed. Not only becomes complicated, but also requires a removal step at the time of inspection, and also requires a wide space for temporarily placing the removed heat insulating material portion 23a. Furthermore, when starting the operation of the reactor pressure vessel, the heat insulating material portion There is a problem that the step of attaching 23a is required and it is not efficient.

The present invention is intended to solve the above problems. That is, the present invention has a simple structure, and interference with the inspection device is surely avoided,
It is an object of the present invention to provide a heat retaining material for a reactor pressure vessel supporting skirt that does not require the steps of removing and attaching the heat retaining material and does not require a wide space for temporary placement.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is directed to the operation of an inspection device in a heat insulator provided close to a support skirt located outside the reactor pressure vessel. It is assumed that the heat insulating material portion located in the range is provided so as to be able to move out of the operating range and be saved.

[0008]

According to the present invention, in the heat insulating material provided close to the support skirt located outside the reactor pressure vessel, the heat insulating material portion located in the operating range of the inspection device is
Since it is provided so that it can be moved to the outside of the operating range and saved, it is possible to avoid the interference with the inspection device by simply moving the heat insulating material part to the outside during periodic inspections. When the reactor pressure vessel is operated after the inspection, the heat insulating material portion can be simply returned to the original position and used as a heat insulating material without any trouble.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway vertical front view showing a first embodiment of the present invention. In FIG. 1, 1 is a reactor pressure vessel, 2 is a support skirt located outside the vessel 1,
3 is a heat insulating material provided close to the skirt 2, 4 is an operating range of the inspection device, 5 is a welding portion, 6 is an inspection pole track, 7 is a pulley to be described later, and 8 is a hanging wire rope. . Reference numeral 3a denotes a heat insulating material portion of the heat insulating material 3 located in the operating range 4, and the whole heat insulating material 3 may be provided so as to be vertically movable. In this embodiment, the heat insulating material portion is provided. 3a is provided so as to be partially movable up and down, as indicated by an arrow 9. That is, a pulley 7 is attached to the heat insulating material portion 3a, and the pulley 7 is engaged with the wire rope 8 suspended from a crane (not shown).

In the heat insulating material of the reactor pressure vessel support skirt constructed as shown in FIG. 1, the heat insulating material portion 3a is moved upward as shown by a chain double-dashed line at the time of periodic inspection. By setting it, it is possible to avoid interference with the inspection device. Further, after the inspection, when the reactor pressure vessel 1 is operated, the heat insulating material portion 3a is returned to the original position as shown by the solid line so that the heat insulating material portion 3a is used for heat insulation without any trouble.

In the embodiment shown in FIG. 1, the pulley 7 and the wire rope 8 are used as means for shifting and retracting the heat insulating material portion 3a. However, it may be manually operated by an operator. Alternatively, the jack may be installed at a position that does not interfere with the operation range 4.

FIG. 2 is a partially cutaway vertical front view showing a second embodiment of the present invention. In FIG. 2, reference numerals 1 to 5 are the same as those in FIG. Also, 3a is the same as in the case of FIG. The heat insulating material 3 is composed of a heat insulating material portion 3a located in the operating range 4 and a heat insulating material portion 3b higher than the heat insulating material portion 3a, and these heat insulating material portions 3a and 3b are connected by a hinge 10. That is, the heat insulating material portion 3a located in the operating range 4 is connected to the heat insulating material portion 3b higher than the heat insulating material portion 3a by the hinge 10 so as to be openable and closable as shown by an arrow 11.

In the heat insulating material of the reactor pressure vessel supporting skirt constructed as shown in FIG. 2, the heat insulating material portion 3a is outside the operating range 4 as shown by a chain double-dashed line at the time of periodic inspection. By opening to one side, interference with the inspection device can be avoided. When the reactor pressure vessel 1 is operated after the inspection, the heat retaining member 3a is returned to its original position even if it is closed as shown by the solid line so that the heat retaining member 3a is used for heat retention without any trouble.

Although a plan view of the heat insulating material portion 3a is omitted, the heat insulating material portion 3a has a fan shape in plan view, and the opening and closing of the heat insulating material portion 3a requires a special drive device. Instead, it can be done manually by a worker.
Regarding the locking means after opening and closing the heat insulating material portion 3a,
In the open state shown by the chain double-dashed line, its position is held by the weight of the portion 3a, but in the closed state of the solid line, the moment of its own weight with respect to the hinge 10 acts, so Engagement members are provided on both of the heat insulating material portions 3a to engage and lock them.

[0015]

As described above, according to the present invention,
In the heat insulating material provided close to the support skirt located outside the reactor pressure vessel, the heat insulating material portion located in the operating range of the inspection device is provided so that it can be moved to the outside of the operating range and retracted. Therefore, at the time of periodic inspection, it is possible to simply move the heat insulating material part to the outside to avoid interference with the inspection device, and when operating the reactor pressure vessel after the inspection, The heat insulating material portion can be simply returned to the original position and used as a heat insulating material without any trouble.

As described above, according to the present invention, a buckle or the like is not used, the structure is simple, and there is no need to remove and attach the heat insulating material portion, and a wide space for temporary placement is provided. Not only is it unnecessary, but also the space around the heat insulating material after the heat insulating material is transferred can be effectively used.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical front view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway vertical front view showing a second embodiment of the present invention.

FIG. 3 is a partially cutaway vertical front view showing an example of a conventional technique.

[Explanation of symbols]

 1 Reactor Pressure Vessel 2 Support Skirt 3 Heat Insulating Material 3a Heat Insulating Material Part 3b Upper Heat Insulating Material Part 4 Operating Range 5 Welding Part 6 Inspection Pole Track 10 Hinge

Claims (3)

[Claims] 1. A heat insulating material provided close to a support skirt located outside a reactor pressure vessel, wherein the heat insulating material portion located in the operating range of the inspection device is located outside the operating range. A heat insulating material for a reactor pressure vessel support skirt, which is provided so as to be able to save transition. 2. The heat insulating material for a reactor pressure vessel support skirt according to claim 1, wherein the heat insulating material portion located in the operating range of the inspection device is provided so as to be able to move upward from the operating range and to be saved. 3. The reactor pressure vessel support skirt according to claim 1, wherein the heat insulating material portion located in the operating range of the inspection device is hinged to the heat insulating material portion above it so as to be openable and closable. Insulation material.