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Criticality Evaluation of Plutonium Disposition Ceramic Waste Form: Degraded Mode

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The purpose of this calculation is to perform degraded mode criticality evaluations of plutonium disposed in a ceramic waste form and emplaced in a Monitored Geologic Repository (MGR). A 5 Defense High-Level Waste (DHLW) Canister Waste Package (WP) design, incorporating the can-in-canister concept for plutonium immobilization is considered for this calculation. Each HLW glass pour canister contains 7 tubes. Each tube contains 4 cans, with 20 ceramic disks (immobilized plutonium) in each. The criticality evaluations estimate the values of the effective neutron multiplication factor, keff, for different degraded internal WP configurations.

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