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ALLEGRO is an experimental high-temperature gas (He)-cooled fast reactor(GFR) under development by the European Consortium V4G4 Centre of Excellence onbasis of the concept ALLEGRO presented by CEA in 2009. Its main purpose is todemonstrate the viability of GFR in pilot scale and simultaneously serve as atest bed for GFR-related technologies, above all the high-temperature resistantrefractory fuel in the conventional oxide fuel driver core. Severe accidentstudies of the concept with the first core (oxide fuel in stainless steelcladdings) are an important part of safety analyses leading to improves inreactor design and safety. This paper extends our previous study using theMELCOR code. Major difference between the previous and this work is decrease ofthermal power and power density to 50 MWth and 66,6 MWth/m3 respectively.Analyses are focused on protected scenarios based on total station blackoutindividually aggravated by loss of primary coolant, water ingress into primarycoolant or malfunction of check valves in the decay heat removal system. Theresults indicate the timing and extent of core degradation and provide valuabledata for design of the core catcher in ALLEGRO.

ALLEGRO Core Degradation Study using MELCOR 2.1