Potential Effect of Saline Solution on Fission Products Mitigation by Pool Scrubbing
Résumé
The potential release of fission products (FPs) to the atmosphere during an hypothetical severe accidents on nuclear facilities is a main issue in nuclear safety. Accurate estimation of these releases is crucial for risk assessment and implementation of appropriate measures. To this end, IRSN studies the mitigation of FPs transported in a carrier gas injected through a liquid pool. This process, referred to 'pool scrubbing', can occur in various accident situations in Pressurized Water Reactors (PWRs), such as Filtered Containment Venting Systems (FCVS) or with the Steam Generator Tube Rupture (SGTR), as well as in nuclear-powered submarines or in new Small Modular Reactors (SMRs) with pressurized water. Experiments dealing with characterization of bubbles hydrodynamics and trapping of iodine compounds (decontamination factors measurements) are currently conducted. In this objective, a dedicated facility named TYFON (Trapping and hYdrodynamics for FissiON products behaviour in pool scrubbing) at IRSN enables to perform hydrodynamics and iodine retention tests for different carrier gas injection rates (characterized by Weber number). In this context, advanced results have been obtained on hydrodynamics in the injection zone and CsI aerosol retention. In line, a new study focused on the impact of a saline solution on these phenomena and on bubble plume modelling has been launched. In the long term, all the experimental data collected, including hydrodynamics and the decontamination factor (DF), will be used to improve the modelling of pool scrubbing phenomenon in the ASTEC code developed by IRSN.
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