The WDMS NT-VK system is designed to collect and monitor radioactive wastewaters, which can obtain the free release only after their radioactivity drops under the values allowed by the laws in force.

NT: Number of Tanks, indicates how many decay tanks are used in the system

VK: Volume in Kiloliters, indicates the volume of each decay tank expressed in kiloliters

The monitoring system’s main components are described in the following:

  • Purification group: Imhoff tanks designed to collect the wastewaters coming from the wards and to separate liquid wastes from solid
  • Sorting group: pumps and conduits system designed to pour the wastewaters in the decay tanks
  • Decay group: tanks array to hold and stock the wastewaters until their radioactive levels reach allowed values for the free release
  • Sampling system: valves and pumps system that performs the washing procedures of the sampling circuit and the stocked wastewaters sampling itself, allowing the measurement in Marinelli geometry
  • Release group: depending on the monitoring results, the wastewaters contained in the sampled tank can be released in the sewers
  • Safety groups and devices: they mainly consist in guard levels - installed in all the system’s critical stages - which stop the wastewaters flow in case of detected anomaly, and a safety flooding well which can eventually collect and stock wastewaters overflowing from any on the system’s group

The entire system is locally managed by a PLC, the action of which are commanded by a remote management software installed on a PC.

Through the interactive synoptic interface of the software the operator can activate the system automatic cycles, set the measurement parameters, visualize the alarms and release archives, and monitor the system’s status (filling levels, pumps stages, measurements, alarms). Depending on the measurement results, and as defined by the procedures in force, the operator can also activate the monitored wastewaters release in the public sewers.

An emergency virtual button is located on the main panel of the software, as well as the PLC switchboard.

NOTE: Some components of the system, mainly the number and the type of the decay tanks, can change according to specific installation requirements; however, the groups of the systems, as described in this document, as well as the functioning logic, are essentially the same.

Additional Info

  • Main features:
    • Automatic system managed by remote PC
    • Imhoff purification tanks
    • Decay tanks
    • Washing and sampling circuit
    • Detector: 2”x2” NaI(Tl), multichannel electronics
    • Measurement geometry: Marinelli beaker in a lead shielding well
    • Release pumps
    • Safety devices against flooding
    • Safety flooding well
    • Power supply switchboard with PLC and local emergency push-button
    • Remote management software with virtual emergency button
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