| 摘要 |
The frame consists of a base and a plurality of square tubes which are secured to the base in upstanding manner. The base consists of rows of intersecting, inter-fitted and inter-welded metal strips which are disposed in mutually perpendicular groups. The tubes are arranged on the strips in a checkerboard fashion with two walls of each tube substantially flush with two parallel strips. In addition, the rows of tubes are offset to one group of metal strips so that the strips are disposed in planes coincident with the longitudinal axes of the tubes in order to support nuclear fuel elements thereon. |
