
SIET lab has unique capabilities:
– electrical power: up to 7.5 MWe
– pump: up to 250 bar
– steam: up to 40 kg/s at 100 bar (sat. temp.) and 10 kg/s at 220 bar 430°C;
– space: up to 28 m in elevation;
– wide area and auxiliary systems available for TH experiments, including a certified measurement testing and calibration lab.
NRGroup facilities:
1. Helical Coil Steam Generator 2. Passive Emergency Heat Removal System 3. Pressure Suppression Vent System
1Experimental facility for the investigation of Helical Coil tubes Steam Generators for Small Modular Reactors (IRIS project): two-phase flow mixtures, pressure drops, critical heat flux, flow instabilities, at full-scale Temperature, Pressure and Power conditions (2 prototypic helical coil tubes: 32 m length, 8 m height, 80 bar, 200 kW/tube).
2Experimental facility to simulate a Passive Safety System for SMRs: natural circulation, two-phase flow, sliding pressure loop, full-scale in elevation (20 m height), scaled power (1:300), to investigate performance, stability, sensitivity to key physical parameters (non-condensables, filling ratio, power).
Both facilities are fully instrumented (over 150 measurement points: temperatures, flow rates, pressures, levels).
3Experimental facility to test Pressure Suppression Vent System, as occurred in Fukushima BWR NPPs and as applied in some innovative SMR technology: the stability of the dynamic behavior of steam condensation/collapse and pressure pulses is investigated. A transparent plexiglass water pool hosts different vent piping terminals. High-speed camera videos show the dynamics of steam flow rate injected at different pressure / temperature into the sub cooled water.
The R&D activity has been carried out in collaboration with IAE (Tokyo) and NHK Japanese TV.
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