Anomalies of Nuclear Criticality by E. Clayton

By E. Clayton

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1-1975 Society, (April with Fis- (Revision -. (13) data on uranium are for uranium enriched to no more than 5% 235 U, and then for high enriched uranium. It should be noted that the critical mass for or less is lower for system; the critical uranium a heterogeneous volume also geneous system. For enrichments minimum critical mass for be less is with or of zero diameter. critical is then possible heterogeneous the critical uranium in a lattice to achieve for system, critical small example with the minimum giving rise and mass including intermediate (for in a smaller fuel solution It volume with rods in water, critical is summarized for enrfchment.

U atom ratios and Density The curves increase Effects of Figure to occur are again for capture in now exceed unity. less there (at very low 235" than unity. can be as many as km is unity and the P‘ * become infinite. R. STRATTON, I LA-3883-MS'\ (29) 1 Ill 1Hf-f lo4 ii? 22 m” lo3 m 0 2 0 E lo* E5 I I I lfl I I I I I I I I lo1 p (235UI DENSITY# g/cm3 Figure 17. Critical Mass (kg 235U) of Homogeneous Spheres Containing 23%J, 238U and Carbon vs. 23% Density for Various 235U Enrichments 48 diluted with effect also There is some evidence water.

A. Libby Northwest volumes of appropriate Laboratories for uranium to provide of Battelle an estimate in the intermediate of the minimum critical systems regardless flected by an unlimited curve of the size data, - Pacific of minimum critical enrichment range from 'L 6% to < 't 93%) as shown in Figure culations experiment 9. range (in the These are cal- volumes applicable to,uranium and shape of the uranium as re- thickness of water. The region of the 235 beyond about 6 wt% U is the area wherein lack of data prevails, which actually includes range beyond natural uranium.

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