Fission Product Transport and Source Terms in HTRs: Experience from AVR Pebble Bed Reactor

Table 1

Main data of the AVR reactor.

Power/Average power density	46MWth (15MWel)/2.5 MW/m^3
Cycle	Steam cycle with the steam generator inside the reactor vessel
Core height/diameter	2.8 m/3 m
Coolant/Pressure	He/10.8 bar
Gas outlet/inlet temperature	700 to 950 (990)^∘C/275^∘C
He-flow	13 to 16 kg/s (depending on desired gas outlet temperature)
Fuel	95000 pebbles (6 cm diam.) diverse fuel types, at end mainly modern TRISO