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For natural uranium fuel, fissile component starts at 0.7% 235 U concentration in natural uranium. At discharge, total fissile component is still 0.5% (0.2% 235 U, 0.3% fissile 239 Pu, 241 Pu ). Fuel is discharged not because fissile material is fully used-up, but because the neutron-absorbing fission products have built up and the fuel becomes ...
2. UO 2 (NO 3) 2 · 6 H 2 O → UO 2 + 2 NO 2 + ½ O 2 + 6 H 2 O (g) This is then converted by heating with hydrogen to form UO 2. It can be made from enriched uranium hexafluoride by reacting with ammonia to form a solid called ammonium diuranate, (NH 4) 2 U 2 O 7. This is then heated to form UO
The void above the uranium collects fission gases, mainly krypton-85. Clusters of the pins inside hexagonal stainless steel jackets 234 cm (92 in) long are assembled honeycomb-like; each unit has about 4.5 kg (9.9 lb) of uranium. Altogether, the core contains about 308 kg (679 lb) of uranium fuel, and this part is called the driver.
The design is graphite-moderated, helium-cooled and based on high temperature reactor (HTR) concepts some of which were pioneered from the Dragon reactor, while the fuel block is based on the earlier Fort St. Vrain reactor. [2] The target fuel is TRISO with 17–20% enriched uranium which might be supplemented by thorium with a beryllium oxide ...
The reprocessed uranium, also known as the spent fuel material, can in principle also be re-used as fuel, but that is only economical when uranium supply is low and prices are high. Nuclear reprocessing may extend beyond fuel and include the reprocessing of other nuclear reactor material, such as Zircaloy cladding.
The requirement can be met with satisfactory local or integrated test results (or a combination of both when an ILRT is performed). [14] In 1988, Sandia National Laboratories conducted a test of slamming a jet fighter into a large concrete block at 775 km/h (482 mph). [15] [16] The airplane left only a 64-millimetre-deep (2.5 in) gouge in the ...
Uranium dioxide (UO 2) can be oxidised to an oxygen rich hyperstoichiometric oxide (UO 2+x) which can be further oxidised to U 4 O 9, U 3 O 7, U 3 O 8 and UO 3.2H 2 O. Because used fuel contains alpha emitters (plutonium and the minor actinides ), the effect of adding an alpha emitter ( 238 Pu) to uranium dioxide on the leaching rate of the ...
The authors report that a layer of U 3 O 7 was present on the uranium dioxide surface during this induction time. They report that 3 to 8% of the krypton-85 was released, and that much less of the ruthenium (0.5%) and caesium (2.6 x 10 −3 %) occurred during the oxidation of the uranium dioxide. [5]