Abstract
Measurements of the effective delayed neutron fraction βeff were carried out at the FCA facility of the Japan Atomic Energy Research Institute to contribute to benchmark experiments of βeff. These measurements were made in three cores: XIX-1 core fueled with 93% enriched uranium; XIX-2 core fueled with plutonium (92% fissile) and natural uranium; XIX-3 core fueled with the plutonium. The experimental βeff was determined with an apparent reactivity worth of a calibrated 252Cf neutron source. The values of βeff were 735±20pcm, 358±10pcm and 249±7pcm in the cores of XIX-1, XIX-2 and XIX-3 respectively.
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