KERENA (earlier known as SWR-1000) is an evolutionary boiling water reactor based on the experience gained from the proven engineering of current generation BWR plants supplemented by an innovative approach. The current final basic design of KERENA is part of a strategic partnership between AREVA and the German utility E. ON Kernkraft. In KERENA, safety systems have been simplified by introducing passive safety systems, and most nuclear safety functions are performed by active systems with a passive system as backup. The core height has been reduced to promote natural circulation, and the eight reactor water recirculation pumps are the so-called wet-motor pumps, where the electric pump motor is situated inside the reactor coolant pressure boundary.