ALLEGRO is an experimental fast reactor cooled with Helium being developed by the European V4G4 Consortium “V4G4 Centre of Excellence” of the nuclear research organizations of the Czech Republic, Hungary, Poland and Slovakia associated with CEA, France. Development of ALLEGRO is an important step on the way to the Gas-cooled Fast Reactor, one of the six concepts selected by the Generation IV International Forum and one of the three fast reactors supported by the European Sustainable Nuclear Energy Technology Platform.
The main purposes of ALLEGRO is the development of:
- GFR refractory fuels (UPuC SiC-SifC cladding)
- Helium related technologies (components, instrumentation, purification,…)
- Safety technical issues and corresponding safety approach framework.
ALLEGRO main design characteristics
|Nominal Power (thermal)||75||MW||Reduced power is being considered in the range
30 – 75 MW.
|Nominal Power (electrical)||0||MW|
|Power density||100||MW/m3||Reduced power density is being considered in the range
50 – 75 MW/m3.
Feasibility of LEU UOX for the start-up core is being investigated.
|Long term core.|
|Type of fuel assembly||Hexagonal wrapper and wired fuel rods|
|Number of fuel rods per assembly||169|
|Number of fuel assemblies||81|
|Number of experimental fuel assemblies||6|
|Number of control and shutdown rods||10|
|Primary circuit coolant||Helium|
|Secondary circuit coolant||Water||Gas is being investigated|
|Tertiary circuit coolant||Air||Atmosphere|
|Core inlet/outlet temperatures||260/516||°C||Should be upgraded for full core refractory fuel.|
|Number of primary loops||2|
|Number of secondary loops||2|
|Number of DHR loops||3||Directly connected to the primary vessel|
|DHR circuits coolant||Helium|
|DHR intermediate circuits coolant||Water|
|DHR heat sink||Water pool|
|Number of accumulators||3||Filled with Nitrogen|