JP2594449Y2 - High-temperature isostatic pressing device using protective capsule - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a high-temperature isostatic pressing method using a protective capsule for reducing the volume of a melting residue (hull, etc.) of a cladding tube or an assembly member generated in a reprocessing step. Pressure device.

[0002]

2. Description of the Related Art HIP (HOT ISOSTATIC PRES) is one of the techniques for stabilizing the volume of dissolved residues (such as hulls) of cladding tubes and assembly members generated in a reprocessing step.
SING) method is used. In the HIP method, a capsule filled with a hull or the like is loaded into a pressure vessel, and a hull or the like is diffusion-bonded by a synergistic effect of high isotropic pressure and high temperature using a gas such as argon as a pressure medium, thereby stabilizing the volume reduction. Technology.

[0003]

However, when filling a hull or the like into a capsule, there is a possibility that impurities such as organic substances and water may be mixed due to omission of sorting, and the HIP process is performed in a state where the impurities are mixed. In addition, the pressure inside the capsule increases due to the generation of gas, and the capsule is broken, which may damage the heater and the like in the pressure vessel. The present invention has been made to solve the above-mentioned problem, and in the volume reduction stabilization treatment of a hull or the like by the HIP method, it is possible to prevent damage to a heater or the like due to capsule breakage which may occur when impurities are mixed in the capsule. And to prevent welding between the protective container and the support.

[0004]

According to the present invention, a capsule filled with a hull or the like is mounted in a pressure vessel containing a heater, and the hull or the like is diffusion-bonded under a high-temperature isostatic press using an inert gas as a pressure medium. In a device designed to stabilize volume reduction,
A protective container having a hole capable of accommodating a capsule and allowing a pressure medium to enter therein is provided on a support base in the pressure container via a welding prevention plate, and the capsule is accommodated in the protective container. .

[0005]

According to the present invention, when a capsule filled with a hull or the like is mounted in a pressure vessel, the cuff cell is housed in a protection vessel, and a hole is formed in a cover of the protection vessel so that argon gas as a pressure medium can be introduced. Furthermore, an alumina welding prevention plate is installed between the protective container and the support base. Since the capsule is housed in the protective container, even if the capsule is damaged, protection of the heater and the like is sufficient. The welding between the protective container and the support can be prevented by the welding prevention plate.

[0006]

FIG. 1 is a conceptual diagram of a HIP body for explaining a pressure protection capsule of the present invention. In the figure, 1 is a pressure vessel,
2 is a heater, 3 is a capsule, 4 is a hole, 5 is a protective container, 6
Denotes a support, 7 denotes a welding prevention plate, 8 denotes a high-pressure cylinder, 9 denotes a heat insulating layer, 10 denotes an upper lid, and 11 denotes a lower lid. As shown in FIG. 1, the HIP device main body is provided with a heat insulating layer 9 in a pressure vessel 1 in which the upper and lower sides of a high-pressure cylinder 8 are closed by an upper lid 10 and a lower lid 11, and a capsule filled with a hull or the like by a support 6 inside the pressure vessel. 3 is supported.

In the HIP method, a capsule 3 filled with a hull or the like is used.
Is mounted in the pressure vessel 1 and the hull and the like are diffusion-bonded by a synergistic effect of high isostatic pressure and high temperature using a gas such as argon as a pressure medium. When the HIP process is performed in a state in which impurities are mixed, the pressure inside the capsule 3 increases due to gas generation, and the capsule is broken. 2 or the like may be damaged. Therefore, in the present invention, the SUS304 protective container 5 that can be accommodated in the pressure vessel 1 and accommodates the capsule 3 is manufactured, and the capsule 3 is accommodated in the protective container 5 and then subjected to the HIP process to damage the capsule 3. To prevent the heater 2 and the like from being damaged.

A hole 4 is formed in the upper lid of the protective container 5 so that an argon gas as a pressure medium can enter therein. When the HIP process is performed while the protective container 5 is left as it is on the support 6 made of graphite, the protective container 5
A eutectic reaction occurs between the support vessel 6 and the pedestal 6, and the protective vessel 5 and the pedestal 6 are welded. To prevent this, a eutectic reaction is prevented by installing a welding prevention plate 7 made of alumina.

[0009]

As described above, according to the present invention, although there has been an event in which the capsule has expanded due to an increase in the internal pressure in the past verification tests, no accident that the capsule is damaged has occurred. However, in the future verification test or practical stage, even if the capsule is broken, protection of the heater and the like can be sufficiently performed, and welding between the protective container and the support can be prevented by the welding prevention plate.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a HIP body for explaining a pressurized protection capsule of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pressure vessel, 2 ... Heater, 3 ... Capsule, 4 ... Hole, 5
... Protective container, 6 ... Support base, 7 ... Welding prevention plate, 8 ... High pressure cylinder, 9 ... Heat insulation layer, 10 ... Top cover, 11 ... Bottom cover.

Claims (1)

(57) [Scope of request for utility model registration] 1. A capsule filled with a hull or the like is mounted in a pressure vessel with a built-in heater, and the hull or the like is diffused and bonded under high-temperature isostatic pressing using an inert gas as a pressure medium to stabilize the volume reduction. In the apparatus, a protective container having a hole capable of accommodating a capsule and in which a pressure medium can be inserted is provided on a support base in the pressure container via a welding prevention plate, and the capsule is accommodated in the protective container. A high-temperature isostatic press using a protective capsule.