| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel element for a light water reactor improved in heat fluid flow and neutron economy. SOLUTION: In the fuel element 1, particularly for a boiling water reactor having a water pipe arrangement R offset from its center, a bundle of fuel rods 15 arranged in plane symmetry with respect to the diagonal W of an internal cross section 7 is provided for redistributing flow of a cooling medium from a first region 3C to a second region 5C, and the distances between the adjacent fuel rods B, B1, B2 are increased monotonously along the diagonal and/or the bundle of fuel rods is entirely offset from the center along the diagonal. Even for the fuel elements of a pressurized water reactor, redistribution of a cooling medium is effective in balancing asymmetry in the core of the reactor.
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