Title:
燃料デブリ保持装置
Document Type and Number:
Japanese Patent JP6608759
Kind Code:
B2
Abstract:
Provided is a fuel debris holding device capable of preventing corrosion of a heat resistant layer by suppressing the occurrence of a fuel debris reduction reaction. According to the present invention, a fuel debris holding device which is disposed inside a pedestal directly below a nuclear reactor pressure vessel supported by the pedestal, and which is disposed on a nuclear reactor containment vessel floor, comprises: a lower layer formed from a first oxide having a melting point higher than 2000ºC; and an upper layer which is disposed on the lower layer and is formed from a second oxide having a free energy of formation that is higher than the free energy of formation of the first oxide. In the event of a severe accident, if molten fuel debris falls from the nuclear reactor pressure vessel onto the upper layer, a reduction reaction occurs between a metal element M1 contained in the fuel debris and the second oxide in the upper layer, generating an oxide of the metal element M1. A reduction reaction therefore does not occur between the metal element M1 and the first oxide in the lower layer, and corrosion of the lower layer can therefore be prevented.
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Inventors:
Masashi Nojima
Shinji Matsushita
Shinji Matsushita
Application Number:
JP2016079369A
Publication Date:
November 20, 2019
Filing Date:
April 12, 2016
Export Citation:
Assignee:
Hitachi ge Nuclear Energy Co., Ltd.
International Classes:
G21C9/016; C23C28/04
Domestic Patent References:
| JP2015017870A | ||||
| JP2015138007A | ||||
| JP2015125006A | ||||
| JP2014062859A |
Foreign References:
| WO2011121908A1 | ||||
| US20130070886 |
Attorney, Agent or Firm:
Polaire Patent Business Corporation