Criticality Characteristics of Mixtures of Plutonium, Silicon Dioxide, Nevada Tuff, and Water

This study focuses on neutronic analysis to examine the criticality conditions for uranium depositions in geological formations resulting from geological disposal of damaged fuels from Fukushima Daiichi reactors. MCNP models are used to evaluate the neutron multiplication factor (k eff ) and critical mass for various combinations of host rock and geometries. It has been observed that the k eff for the deposition become greater with (1) smaller concentrations of neutron-absorbing materials in the host rock, (2) larger porosity of the host rock, (3) heterogeneous geometry of the deposition, and (4) greater mass of uranium in the deposition. This study has revealed that the planar fracture geometry applied in the previous criticality safety assessment for geological disposal would not necessarily yield conservative results against the homogeneous uranium deposition.

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Criticality Characteristics of Mixtures of Plutonium, Silicon Dioxide, Nevada Tuff, and Water

Cited by 2 publications

References 5 publications

Mathematical and computational models for simulating transient nuclear criticality excursions within plutonium nitrate systems

Mathematical and computational models for simulating transient nuclear criticality excursions within plutonium nitrate systems

Conditions for criticality by uranium deposition in water-saturated geological formations

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