| 摘要 |
<p>The present invention relates to a spacer and a fuel assembly with a spacer (7) intended to retain, at a plurality of levels, elongated elements (3, 3a) in a nuclear reactor. The spacer (7) comprises a preferably orthogonal grid structure of spacer cells (7a) formed from crossed first and second, for example wavy, strip elements (10a, 10b) standing on edge, forming points of intersection (16) and with an edge normally arranged downstream in a nuclear reactor. The invention is characterized in that, at the downstream edge, the first strip elements (10a) comprise mixing vanes (11) and the second strip elements (10b) comprise openings (12). A mixing vane (11) is formed by arranging a slit (15) substantially parallel to the axial direction of the spacer (7) and by bending the cell wall formed between the point of intersection (16) and the slit (15) into the spacer cell (7a). An opening (12) is formed by a recess in the second strip element (10b) or when forming a mixing vane (11). The mixing vanes (11) and the openings (12) are arranged such that substantially each spacer cell (7a) comprises two mixing vanes (11) and four openings (12). <IMAGE></p> |
