| 摘要 |
984,931. Nuclear fuel elements. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. Dec. 14, 1961 [Dec. 28, 1960; Jan. 1, 1961], Nos. 44436/60 and 1319/61. Heading G6C. A fuel element sheath has integral heat transfer fins disposed in an even number of sectors around the sheath, the fins in each sector being parallel to one another while the fins in adjacent sectors are inclined towards one another, thus forming a herringbone pattern. The fins 11 may be straight (Fig. 1b or curved (Fig. 2b, not shown). Integral longitudinal fins 15 of greater depth than the fins 11 may be provided along part of the length (Fig. 1b or along the entire length (Fig. 2b, not shown) of the sheath to resist bowing, or longitudinal grooves 32 (Fig. 3a) may be machined into the fins. In the latter case, the grooves 32 may be of dovetail section and house the dovetail roots 34 of longitudinal anti-bowing braces 35. The fuel element shown in Fig. 5 has two sets of parallel heat transfer fins 41 inclined at an angle of 120‹ to one another and longitudinal fins 52 are located in slots 51 between, also midway round, the fins and held by braces 53 spot welded at 54. |
