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Remaining issues in pool scrubbing: Major drivers for experimentation within the EU-PASSAM Project

pubblicazioni - Memoria

Remaining issues in pool scrubbing: Major drivers for experimentation within the EU-PASSAM Project

L’incidente di Fukushima-1 ha evidenziato l’importanza dei sistemi di abbattimento a umido dei prodotti a fissione, prima del loro rilascio dal contenimento di un BWR-Mark-I. Questo documento sintetizza le principali conoscenze acquisite e le lacune individuate, sulla base dell’indagine condotta in letteratura, le condizioni sulle quali la ricerca sperimentale dovrebbe incentrarsi e le strutture in cui la sperimentazione si svolgerà nell’ambito del progetto EU-PASSAM. condotte su provini di calcestruzzo rivestiti con malte caratterizzate da due diversi rapporti tra polimero e cemento.

The Fukushima-1 accident highlighted the relevance of having a passive wet trap for fission products before being released from the BWR-Mark-I containments. Even though pool scrubbing was heavily investigated in the 80’s and 90’s of last century, a peer review of data obtained and codes developed at that time, has led to conclude that there are knowledge gaps of significance for nuclear safety that should be investigated. This paper summarizes the major insights gained from the literature survey conducted, the anticipated conditions under which experimental research should be focused on and the available facilities in which experimentation will take place within the framework of the EU-PASSAM project. Despite the large body of information available, a lack of systematic analysis of major influencing variables on pool scrubbing, particularly those of a hydrodynamic nature, has been found. Among them, particular emphasis will be placed in upcoming EU-PASSAM campaigns on: high injection velocities of the carrier gas (i.e., jet injection regime), gas rise hydrodynamics under both bubbly regime (low gas velocity) and churn-turbulent flow (high gas velocity) and the effect of submerged structures. The resulting database is expected to allow a comprehensive validation of existing hydrodynamic models in integral safety codes and to serve as the basis for new models development, if necessary. Additionally, the paper will briefly outline the EU-PASSAM framework.

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