CSNI2045 THAI-3.

THAI-3

The experimental investigations carried out in the frame of the THAI (2007-2009) and THAI-2 (2011-2014) projects contributed significantly to improve the understanding of hydrogen and fission-product-related issues in a water-cooled reactor containment in design basis and severe accident conditions. The tests were conducted by Becker Technologies (Germany) in the 60 m³ stainless-steel THAI vessel. For THAI-3 (2016-2019) the facility had been enhanced to a linked, two-vessel apparatus named THAI+ with a total enclosed volume of 80 m3.

Open issues related to hydrogen and FPs were investigated in THAI-3 and benefited from the enhanced capabilities of the THAI+ facility where the following experiment series were performed:

PARs performance in the adverse conditions of counter-current flow

hydrogen combustion and flame propagation in a two-compartment system and looking in particular at the impact of higher flow velocities of the unburned gas on flame acceleration

FP re-entrainment from water pools at elevated temperature

resuspension of FP deposits (aerosol and molecular iodine) due to a highly-energetic event, e.g. hydrogen deflagration.

Experimental investigations in the THAI+ facility addressing remaining containment hydrogen and source term issues are being conducted in the THEMIS project (2020-2024).

Project participants: Belgium, Canada, China, Czech Republic, Finland, France, Germany, Hungary, India, Japan, Korea, Luxembourg, Slovak Republic, Sweden

Project Period: February 2016 to July 2019

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For detailed information, please visit the THAI Project.