Advanced boiling water reactor concepts

The further development of the German boiling water reactor line follows both evolutionary and revolutionary pathways, the latter only up to certain unit sizes. The reason for continuing to develop large boiling water reactors is the operating experience accumulated with proven plants, i.e., the backing afforded by a proven technology. As in the case of pressurized water reactors, the purposes of advanced development are the further reduction of the residual risk of accidents going beyond the design basis by employing the simplest possible engineered safeguards measures, and cost reductions to maintain the plants' economic viability despite technical advances. (orig.)