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First Insights of the EU-PASSAM Project: Towards the Enhancement of Source Term Mitigation Systems

pubblicazioni - Presentazione

First Insights of the EU-PASSAM Project: Towards the Enhancement of Source Term Mitigation Systems

Il progetto europeo “PASSAM – Passive and Active Systems on Severe Accident source term Mitigation” (7th FWP EURATOM), è stato costruito per esplorare i potenziali miglioramenti dei dispositivi di mitigazione esistenti e dimostrare la capacità dei sistemi innovativi per ottenere una maggiore ritenzione nel caso di incidente nucleare. Questo lavoro riassume le principali conoscenze acquisite relative alle lacune esistenti della performance dei sistemi alle condizioni di lavoro previste in caso di un incidente nucelare grave.

After the Fukushima-1 accident one of the main concerns of the nuclear industry has been the search for even better source term mitigation systems. The motivation underneath is to enhance as much as feasible the performance of in-plant devices, so that their decontamination efficiency is not jeopardized under any expected or unexpected conditions. The R&D “Passive and Active Systems on Severe Accident source term Mitigation” (PASSAM) project (7th FWP of EURATOM), has been built to: explore potential improvements of existing source term mitigation devices and demonstrate the ability of innovative systems to achieve even larger source term attenuations. Heavily relying on experiments, its activities will focus on: degraded conditions of operation, source term composition effects and long term behaviour. Hence, the PASSAM project will provide new data on the capability and reliability of a number of systems related to Filtered Containment Venting Systems (FCVS): aqueous ponds, sand filters, high pressure sprays, acoustic agglomerators, electrostatic precipitators, new trapping materials and combinations. As a first project stage, an in-depth analysis of literature is being conducted to find out missing, safety-relevant information of all these systems. This paper summarizes the main insights gained concerning the existing knowledge gaps worth to be investigated: hydrodynamic aspects of pool scrubbing aqueous ponds, long term stability of filtered fission products and molecular and organic iodine retention in sand bed filters, comparison of dry and wet operation in case of electric filtration, effects of high pressure sprays in contaminated gas heading for FCVS, particle growth due to acoustic fields, new porous adsorbent materials (most probably, zeolite variation) and retention efficiency of combined systems (jet scrubber plus mechanical and adsorptive filters). In addition, the paper will briefly outline the structure, the major contributors and the expected outputs of the PASSAM project.

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