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[2M10] Practical gamma ray measurement of short half-life noble gas (135Xe, 88Kr) emitted by fuel debris for criticality estimation
Keywords:Fuel Debris, Subcritical System, Neutron Multiplication Factor, Short Half-life Fission Products, activity ratio of 88Kr to 135Xe.
Our previous study showed a linear relationship between the activity ratio of 88Kr to 135Xe and the effective multiplication factor, keff, in a primary containment vessel (PCV) and in a fuel debris canister. The accuracy of the activity ratio, which closely related to the accuracy of predicted keff , is estimated based on an existing gamma ray energy spectrum. Practical measurement method for the gamma ray from nuclides in the PCV and the fuel debris canister gas is proposed.
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