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pubblicazioni - Memoria

Sodium Safety – Spray and Pool Fires Ecart Modeling

pubblicazioni - Memoria

Sodium Safety – Spray and Pool Fires Ecart Modeling

Descrizione dei primi risultati ottenuti attraverso i modelli di pool fire e spray fire di sodio liquido, sviluppati ed implementati nel codice di calcolo ECART. Cenni all’attività sperimentale relativa all’apparecchiatura LISOF dedicata agli spray del metallo.

The Sodium-cooled Fast Reactor (SFR) system is a Gen IV fast-neutrons spectrum nuclear reactor, using liquid sodium as coolant fluid. Liquid sodium has good properties as coolant, but its use implies a considerable risk if a leak occurs in the cooling system, as sodium is a very reactive metal with oxygen and water. Moreover, hot sodium can react with concrete (mainly because of water and calcareous substances inside). Sodium in the liquid phase at high temperature has been shown to have high capacity to bypass / penetrate micro-defects, seals etc. Due to such a reason an activity focused on investigation of phenomena relative to losses from small cracks in mechanical components constituting the plant was planned and it is currently underway. In particular, an experimental activity was carried out with a test rig called LISOF (LIquid SOdium Facility) to analyze the leakage of liquid sodium from emission sources of small size. That activity is mainly intended to support the development of spray and pool fires modeling. In this respect, an original model of liquid sodium pool was developed to extend the capabilities of ECART code (lumped parameters numerical tool focused on consequences calculation of an accident in nuclear – conventional installations with airborne transport of dangerous substances). After that, a spray fire model based on NACOM computer code model (United States Nuclear Regulatory Commission) was developed. It simulates the combustion of sodium droplets, and predicts the resulting air – smoke pressure and temperature of surrounding atmosphere. Those models were implemented inside ECART after a first validation of stand-alone versions and preliminary results are described herein.

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