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By E. Clayton

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The minimum critical when arranged criticality optimum moderatton) but the magnitude diameter lattice quantitiesofuranium for enrichments, rods of each of the three were 30 inches The number of rods required cylindrical could uranium wherein both tri(19) See Figure 11. 95% enriched in diameter rods and annuli (18) 0. 6 in. 2 in. 6 in. to produce were used. 2, vs. 7 greater than when in a triangular pattern. ), ---_. ---. Figure 11. Square Lattice vs. 85) both as annuli difference and as rods, in the when ar- ranged in each pattern.

The most important shielding section lumping and decrease of passing 238 encountering is duetothe and water, p, f and g, entering cause k to increase By lumping slowing assemblies the uranium the resonance and moderator flux will are separated; as under these be at a minimum in the presence conditions, of the uranium. Lumping the fuel also increases the probability of causing fission. in 238 U before the neutron energy is degraded below the fast fission threshold will by collision be increased.

10) Calculations indicate that 240 Pu could, by itself, be made critical under certain conditions specifically those diluent. under which there The interaction principally fission effect section for on the neutron slow neutrons the concentration clearly of triple portrayed Note that which points a given be as many as three radius different would then oscillate brought by the mere addition the hydrogen-to-fuel Critical Critical mixed oxides If ratio curve that would be possible for concentrations would be four whereas, that the neutron is changes spectrum.

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