Compositions – Organic luminescent material containing compositions – Scintillating or lasing compositions
Patent
1977-12-05
1980-06-17
Sebastian, Leland A.
Compositions
Organic luminescent material containing compositions
Scintillating or lasing compositions
159 23, 159 47WL, 159DIG12, 165 70, 165 71, 203 4, 203 99, 203DIG7, G21F 908
Patent
active
042082986
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.
REFERENCES:
patent: 3293151 (1966-12-01), Holzer et al.
patent: 3400753 (1968-09-01), Slover
patent: 3714978 (1973-02-01), Pirk et al.
Irie Hiromitsu
Isozaki Kazuhisa
Kuribayashi Nobuhide
Tajima Fumio
Kyle Deborah L.
Nippon Genshiryoku Jigyo Kabushiki Kaisha
Sebastian Leland A.
Tokyo Shibaura Denki Kabushiki Kaisha
Toshiba Engineering Kabushiki Kaisha
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