| 摘要 |
<p>1,103,217. Nuclear fuel elements. FUER KERNFORSCHUNG G.m.b.H. 3 June, 1965 [3 June, 1964; 31 Dec., 1964; 26 March, 1965], No. 23758/65. Heading G6C. Fission product gases are discharged from nuclear fuel elements through devices which delay the passage of the gas for at least 10 days in order to allow its radioactivity to decrease, intermixing of newly-formed fission gases with fission gases whose radioactivity has partially died down being prevented. The fuel may comprise UO 2 + PuO 2 and the gas may be discharged into the coolant, for example liquid metal, gas, or steam. An absorption filter arranged between the fuel and the delay device, or in the delay device, serves to absorb or react with volatile condensible fission products such as bromide, iodine, rubidium, and caesium. The fuel element may be filled with an inert gas to prevent entry of coolant. A series of delay chambers may be provided, connected by narrow passages formed electronically or by passages filled with compressed sintered powdered absorbent (Figs. 1-3, not shown). The passage may be in the form of a labyrinth (Fig. 4, not shown). One or more flattened tubular devices may act as excess pressure valves (Figs. 5-7, not shown) so as to prevent escape of fission gases until a predetermined pressure has been reached.</p> |
