[en] The main activity of the German Brown Boveri Comp. is the pebble-bed reactor system. The experimental power unit AVR-15 went into operation in 1967 and has been demonstrating for the last 20 years the excellent behaviour of a helium-cooled pebble-bed reactor (15 MWe). The 300 MWe Thorium High Temperature Reactor (THTR-300) has been in full operation since September 1986. The follow-up projects HTR-500 (550 MWe) and HTR-100 (100 MWe) are under development. The Gas-Cooled Heating Reactor of 10 MW thermal power (GHR-10th) is under evaluation in Switzerland together with two other concepts of small heating reactors. LWR systems were also taken up by Brown Boveri in the mid sixties when BBC, as an experienced supplier of turbine generators and electrical and control equipment, formed partnerships with experienced reactor suppliers for example, Westinghouse and General Electric, to deliver turnkey nuclear power plants