Metallic RAW and AC Filter Processing Line
A specialized workstation has been constructed to deal with the metallic materials from the former A1 NPP powerhouse. Metallic RAW is sorted according to intensity of contamination and according to the type of metallic RAW: carbon metals, high-grade steel and colored metals. Depending on the type, the size, the amount of contamination, the weight and the shape, the metallic RAW is fragmented, using thermal or mechanic methods, to a predetermined size and subsequently decontaminated by jet-blasting (dry method), or at a large volume decontamination line (wet method). In each step of the sorting, fragmentation and decontamination, the processed RAW is continually monitored by dosimeters, thus providing a reading about the efficiency of the decontamination and securing the safety of the fragmentation, from a radiation safety perspective. The purpose of the fragmentation and the decontamination is to decontaminate the metallic waste to a level below the limits for reintroduction back into the environment. Metallic waste, which does not meet these requirements, is designated for re-melting. Electric cables are processed at specialized facilities, which separate the individual components of the material (plastic, aluminum, copper).
At the used AC filter workstation, used filters are ground, their materials separated and prepared for further gradual processing. After its dose rate has been measured, a used air conditioning filter, wrapped in PE foil is transported on a trolley to the grounding and separation station, to a lifting conveyor. The AC filter processing plant is designed to operate in several modes, depending on the types of filters processed, on their level of contamination and combustibility of their fragments. This is made possible by the variable arrangement of the individual line elements, as well as by the option of reversing the material flow direction – thanks to reversible conveyor belts. After the grinding and the separation according to material type (cellulose, iron, aluminum, plastic), the separated materials are automatically filled into 200 liter barrels. The individually separated iron and aluminum are stored in barrels. Combustible fragments of the filters are put into PE bags, which are subsequently put into barrels. AC filter fragments packaged in this way then go on to be combusted at the BPC incinerating facility. Non-metallic filter fragments containing PVC or ones exceeding the dose rate of 10 microGy/h are mixed with chemicals which prohibit the growth of microorganisms, then put into barrels and compressed at a low-pressure press. Subsequently, these pre-compressed filter fragments are further compressed at the Bohunice Processing Center, using a high-pressure press.