The WDMS NT-VK main components are the following:

• Purification group: Imhoff tanks designed to collect the wastewaters coming from the wards and to separate liquid from solid waste
• Sorting group: pumps and conduits system designed to pour the wastewaters in the decay tanks
• Decay group: decay tanks array to hold and stock the wastewaters until their radioactive level drops below a defined value
• Sampling system: valves and pumps to perform the washing of the sampling circuit and the sampling of the stocked wastewaters, 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 critical stages – which stop the wastewaters flow in case of detected anomaly, and a safety flooding well which can collect and stock wastewaters potentially overflowing from any system group

The entire system is locally managed by a PLC, which is 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, pump 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 sewers.

LEM system is composed of the following main parts:

• Stainless steel support structure
• Electrical and command board with panel PC integrated in the stand
• Measurement system: NaI(Tl) detector, electronics for HV and signal processing, 1 l Marinelli, 5 cm lead shielding well
• Self-priming pump
• Software for system management, data acquisition and processing

The system is equipped with a touch-screen operator panel, where the ELSE NUCLEAR software is installed.

The software displays in real time the measurement, controls the system status, and allows to set the operative parameters (including the alarm thresholds), to manage the measurement steps. The system provides I/O contacts for:

• Good functioning status
• Alarm status
• Pump activation input from customer PLC
• Available I/O contact for specific requirements

The software is equipped with a routine for quality control, to be used with the test source optionally provided with the system.

The system displays the specific and the total activity, or the count rate and integrated counts.