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:
Jun. 17, 1980
Filed:
Dec. 05, 1977
Hiromitsu Irie, Higashi-Minemachi, JP;
Fumio Tajima, Tokyo, JP;
Nobuhide Kuribayashi, Tokyo, JP;
Kazuhisa Isozaki, Tokyo, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Nippon Genshiryoku Jigyo Kabushiki Kaisha, Tokyo, JP;
Toshiba Engineering Kabushiki Kaisha, Tokyo, JP;
Abstract
In a process for treating radioactive liquid waste having an evaporation concentration device, including a concentration vessel, and a steam heater having steam inlet and outlet lines and operating to heat, with heating steam, radioactive liquid waste in the evaporation concentration device so as to concentrate the waste, contamination of the entire steam heater system in the event of leakage is prevented or greatly reduced by the provision of: (1) a sluice valve in the steam outlet line near the heater; (2) a discharge line with a drain valve for discharging any waste fluid between the heater and the sluice valve; and (3) means for receiving radioactive waste discharged through the discharge line. In accordance with the process of the present invention, when the pressure within the steam heater is less than that within the concentration vessel, and the operation of the evaporation concentration device is to be resumed, the sluice valve is first closed and the drain valve is opened. As a result, any concentrated waste solution which has infiltrated into the steam heater is discharged through the discharge line and drain valve. After a predetermined operative period of time, the drain valve is then closed and the sluice valve opened, and consequently, non-contaminated heating steam is again permitted to flow through the steam line.