| 摘要 |
911,710. Fuel elements. COMMISSARIAT A L'ENERGIE ATOMIQUE. May 11, 1960 [May 11, 1959], No. 16607/60. Class 39 (4). [Also in Group XXII] In making a sheet-metal sheath for the fuel element of a nuclear reactor, the fuel rods or mandrels 3 are supported flexibly so that they move laterally as the sheets 1, 2 are formed about them, the sheets suffering no change in thickness during the forming operations. The sheath of Fig. 4 is made by assembling the mandrels 3 between sheet-metal cylinders 1, 2, and locating them endwise between elastomer &c. supporting sleeves 4 backed by plugs 6 secured by welding. Cold or hot forming in an hydraulic machine follows, and severing operations to remove the mandrels, which are replaced by fuel elements secured by welded plugs (not shown). Contiguous parts of the sheath may be seam, or spot-welded, knurled or crimped (Fig. 6, not shown), during the forming operations. In a modification, Fig. 5, the hollow mandrels 9 between the cylinders 7, 8 are supported flexibly by wires 10-12 connected to plugs or springs 13-15 in the mandrels. The fuel rods may be arranged in different patterns Figs. 7-9 (not shown). |
