放射性廃水蒸発濃縮処理装置の除染係数

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  • Decontamination Factor of a Radiochemical Waste Evaporator System
  • ホウシャセイ ハイスイ ジョウハツ ノウシュク ショリ ソウチ ノ ジョセン ケイスウ

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A study was made to determine the decontamination efficiency of a radiochemical waste evaporator system, consisted of evaporator, cyclone, mist-separator and condenser. The system was designed to handle the liquid radioactive waste, ranged in activity from 10-4 to 10-2 μc/ml, at the rate of 200 1/hr and to get a volume reduction ratio of 100200. The evaporator is single effect and vertical shell-and-tube type. The evaporator is operated for non-foaming liquid by fixing the liquid level above the upper tube sheet of the calandria as usual. 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, the cyclone and the mist-separator and the over-all decontamination factor were measured for the boil-up rates varying from 50 to 300 l/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 106108 and it was revealed that the required decontamination efficiency was achieved. Some discussions are given on the mechanism of the generation of liquid entrainment.

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