Time filter

Source Type

Waldenbuch, Germany

Henning K.,HAKA Kunz GmbH | Gojowczyk P.,HAKA Kunz GmbH
ATW - Internationale Zeitschrift fur Kernenergie

Decontaminants used in the nuclear field must meet a variety of requirements. On the one hand, the washing process must remove radioactive contamination and conventional dirt from the items washed. On the other hand, subsequent disposal of the washing water arisings must be feasible by the usual waste disposal pathway. One aspect of particular importance is unproblematic treatment of the radioactively contaminated waste water, as a rule low to medium active, whose final storage must be ensured. Decontaminants must not impair waste treatment processes, such as evaporation, filtration, and centrifuging, as well as further treatment of the concentrates and residues arising which are worked into matrix materials (cementation, bituminization), in drum drying or roller mill drying. For reasons of safety at work and environmental quality, also aspects of human toxicology and ecotoxicology must be taken into account.this way, handling decontaminants will not jeopardize the health of personnel or cause potential long-term environmental damage. Liquid decontaminants, compared to powders, offer the advantage of automatic dosage. The liquid product is dosed accurately as a function of the washing program used. Liquid decontaminants can be handled safely in hot laundries without causing skin and eye contacts. Source

Regular decontamination work in nuclear facilities is carried out on materials with different qualities and surfaces from which both radioactive and conventional contamination must be removed. Decontaminants with specific action must be employed in this cleaning work if contamination is to be removed effectively. Hazards to personnel and corrosion of materials must be excluded. Personnel is protected in these activities by decontamination and cleaning of protective clothes and equipment and, if necessary, of the body, and the preventive measures of personnel protection to be taken before work is started. This concept assumes that the radioactive liquid effluent arising in any decontamination process can be treated without any problem and without causing difficulties in waste and concentrate treatment. This applies fully to waste water treatment by evaporation, filtration, and cylinder mill drying as well as to the subsequent incorporation of concentrate arisings in cement or bitumen. Product criteria to be taken into account, such as thermal stability, low foaming capacity, and low water vapor volatility, are met reliably in a program of decontaminants to be applied systematically. A line of products successfully employed in nuclear practice are available. Source

Discover hidden collaborations