Tokyo Shibaura Denki Kabushiki Kaisha

Satake Corporation

Nippon Genshiryoku Jigyo Kabushiki Kaisha

Toshiba Engineering Kabushiki Kaisha

Hitachi, Ltd.

Fumio Tajima

Koji Yamamoto

Kazuto Nonaka

Yasunori Koike

Yasuyoshi Seto

Hiromitsu Irie

Nobuhide Kuribayashi

Kazuhisa Isozaki

A bran removing wire-mesh tube includes: bran removing wire-mesh tube partsdivided in more than one in a circumferential direction in planar view; and a plurality of support pillarserected at intervals in the circumferential direction to respectively fix both side edges of the divided bran removing wire-mesh tube parts. Each of the support pillarsis provided with an elongated resistorthat suppresses grains from moving in the circumferential direction along with rotation of grinding type grain cleaning rolls. The resistoris urged by an elastic memberto a position at which the resistorprotrudes toward the inside of a grain cleaning chamber. Further, the resistoris provided so as to be movable in a radial direction to a position farther from the grain cleaning chamberdue to resistance from the grains.

Grinding type vertical grain polishing machine

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.

Process for treating radioactive liquid waste

Growing community of inventors

Tokyo, Japan

Fumio Tajima