Decontamination Factor of a Radiochemical Waste Evaporator System (in Japanese)
Journal Article
·
· Nippon Genshiryoku Gakkai-Shi
A study was made to determine the decontamination efficiency of a radiochemical waste evaporator system, which consisted of evaporator, cyclone, mist-separator and condenser. The system was designed to handle the liquid radioaetive waste, which ranged in activity from 10⁴/ 10⁻² mu c/ml, at the rate of 200 1/hr and to get a volume reduction ratio of 100 ~ 200. The evaporator is single effect and vertical shell-and-tube type, and is operated for non-foaming liquid by fixing the liquid level above the upper tube sheet of the calandria. For foaming liquid, however, the evaporator is operated by lowering the liquid level below the middle of the calandria. In the latter case, the upper part of the tubes above the liquid surface serves as a foam breaker. The decontamination factors of the evaporator, cyclone, and mist-separator and the over-all decontamination factor were measured for the boil-up rates varying from 50 to 300 1/hr. Lithium chloride and strontium nitrate solutions were used as test liquid. The decontamination characteristic of the evaporator is different for the two test liquids and depends on the liquid level. The over-all decontamination factor was measured to be 10/sup 6/ ~ 10⁸ and it was revealed that the required decontamination efficiency was achieved. Discussion is given on the mechanism of the generation of liquid entrainment. (auth)
- Research Organization:
- Radiation Center of Osaka Prefecture
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-014372
- OSTI ID:
- 4795245
- Journal Information:
- Nippon Genshiryoku Gakkai-Shi, Journal Name: Nippon Genshiryoku Gakkai-Shi Journal Issue: 2 Vol. 4; ISSN 0004-7120
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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