Replacement fuel assembly for nuclear reactor used in nuclear power plant, has adjusting units to adjust outer dimension of second fuel element such that second fuel element is inserted into core which receives first fuel element

摘要

The replacement fuel assembly has a receiving core that receives first fuel element with first outer dimensions (b1,h1). A second fuel element (2) is formed with second outer dimensions (b2,h2) which are smaller than the first outer dimensions of the first fuel element. The outer dimension of the second fuel element is adjusted by adjusting units (4a,6a) such that the second fuel element is inserted into the core.