The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 2022
Filed:
Mar. 01, 2018
Kurita Engineering Co., Ltd., Osaka, JP;
Hitachi-ge Nuclear Energy, Ltd., Hitachi, JP;
Masahiko Kazama, Osaka, JP;
Naobumi Tsubokawa, Osaka, JP;
Kazushige Ishida, Tokyo, JP;
Satoshi Ouchi, Hitachi, JP;
Junji Iwasa, Hitachi, JP;
KURITA WATER INDUSTRIES LTD., Tokyo, JP;
HITACHI-GE NUCLEAR ENERGY, LTD., Hitachi, JP;
Abstract
A chemical decontamination method includes a dissolution step in which a radioactive insoluble substance containing a metal oxide, the radioactive insoluble substance being adhered to a decontamination object including carbon steel, is dissolved in a decontamination solution and a metal-ion removal step in which the decontamination solution containing the metal ion, the decontamination solution being produced in the dissolution step, is brought into contact with a cation-exchange resin in order to remove the metal ion, the dissolution step including a reductive dissolution step conducted using a decontamination solution containing formic acid, ascorbic acid and/or erythorbic acid, and a corrosion inhibitor.