Anomalies of Nuclear Criticality by E. Clayton PDF


By E. Clayton

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Since depression itself, if will in k. 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.

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.

Z), the occurrence of points below about 12 wt% of discontinuity in the case of 235U enrichments 235 U. As the metal is diluted with carbon, the curves of critical 235 U density undergo sharp changes in curvature, to exhibit mass vs. a cusp (the the point) curves appear concave 235 U concentrations for upward from both right in carbon and left of 235 U/cm3. 01 WEIGHT OF WATER WEIGHT OF DRY COMPOUND 235 Figure 74. Computed Critical Volume as Water is Added to 30/70 PuO2/ U02 at 7 g/cm' 40 2. The Reduction in Mass of the Sphere .

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Anomalies of Nuclear Criticality by E. Clayton

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