Reactor Design The sodium (lithium) cooled reactor, illustrated in Fig. 5, contains 780 UO2 fuel rods 8.5 mm in diameter (780 UN rods 9.0 mm in diameter). The active core of H/D = 270/290 mm (H/D = 290/310 mm) (leading to a content of 70 kg (110 kg) of 93% enriched uranium) is reflected axially by 7 and 14 cm thick BeO control drum elements on the upper and lower parts.
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