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Member for nuclear reactors

A technology for nuclear reactors and components, used in reactors, nuclear engineering, nuclear power generation, etc., can solve problems such as hindering the structure and function of graphite

Active Publication Date: 2015-08-26
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, creep deformation (hereinafter referred to as "creep deformation") is known to occur under neutron radiation, and the creep deformation increases with the operation of a nuclear reactor, resulting in disturbance of the function of the graphite structure

Method used

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  • Member for nuclear reactors
  • Member for nuclear reactors

Examples

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Comparison scheme
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Embodiment 1

[0052] Embodiment 1 of the present invention will be described below. figure 1 is a cross-sectional view of a nuclear reactor component according to Example 1 of the present invention. Example 1 has a structure in which the surface of a pellet-shaped core portion is covered with a silicon carbide (SiC) covering layer.

[0053]

[0054] Graphite powder (which is graphite particles with a weight of 3.1 g and a 50% volume particle diameter of 3.65 μm) was filled into a mold with pores of φ25 mm and pressurized at a pressure of 19 MPa. The core part molded from graphite powder is removed from the mold. A flat plate-shaped core portion of φ25×6 mm is formed, which is brittle and easily broken.

[0055] The graphite powder was obtained by coarsely pulverizing an isotropic graphite material ET-10 (manufactured by Ibiden Co., Ltd.), followed by pulverization with a jet mill.

[0056] The apparent density of the core part is 1.05 g cm -3 .

[0057]

[0058] The core portion ob...

Embodiment 2

[0062] Embodiment 2 of the present invention is described below. figure 2 It is a cross-sectional view of a nuclear reactor component according to Example 2 of the present invention. Example 2 has a structure in which the surface of a pellet-shaped core portion is covered with a pyrolytic carbon coating and further covered with a silicon carbide (SiC) coating.

[0063]

[0064] Graphite powder (which is graphite particles with a weight of 3.1 g and a 50% volume particle diameter of 3.65 μm) was filled into a mold with pores of φ25 mm and pressurized at a pressure of 19 MPa. The core part molded from graphite powder is removed from the mold. A flat plate-shaped core portion of φ25×6 mm is formed, which is brittle and easily broken.

[0065] The graphite powder was obtained by coarsely pulverizing an isotropic graphite material ET-10 (manufactured by Ibiden Co., Ltd.), followed by pulverization with a jet mill.

[0066] The apparent density of the core part is 1.05 g cm -...

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Abstract

Provided is a member for nuclear reactors capable of being stably used without swelling or creep deformation even if directly exposed to neutrons with no additional improvements in nuclear reactor operation conditions or devices. A member for nuclear reactors comprises a core section comprising an aggregate of graphite particulates and a covering layer comprising a dense body of ceramic covering the core section. Because graphite that is affected by neutron irradiation is used in a state of aggregation of particulates and is not mutually connected, the shape and dimensions of the member for nuclear reactors is not affected even if there is swelling, creep deformation, or the like. Moreover, this member for nuclear reactors has a covering layer comprising a dense body of ceramic covering the core section. Because the covering layer comprising the dense body is more durable than graphite with respect to neutron irradiation, the shape and dimensions of the member for nuclear reactors are unlikely to be affected.

Description

technical field [0001] The present invention relates to components for nuclear reactors, for example, light water reactors (such as boiling water reactors and pressurized water reactors), heavy water reactors, gas-cooled reactors (such as high-temperature gas-cooled reactors and ultra-high-temperature gas-cooled reactors), liquid metal cooling reactors, and fast sub-breeder reactor. In particular, the invention relates to components useful as neutron moderators and neutron shields. Background technique [0002] Since graphite materials exhibit little absorption of neutrons and have relatively high neutron moderation capabilities, this material has been widely used as a neutron moderator and neutron barrier in nuclear reactors. [0003] Graphite materials have been used as neutron moderators in graphite-moderated reactors and high-temperature gas-cooled reactors, and research and development in these areas have recently progressed. In addition, graphite materials have been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C5/00G21C11/02G21F3/00
CPCG21F1/12Y02E30/40G21C11/028G21C5/126G21C5/00G21C11/02G21F3/00Y02E30/30
Inventor 韩明旭高木俊
Owner IBIDEN CO LTD
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