Reactivity Effects of Concrete Slabs in Single and Coupled Cores of Rectangular Parallelpiped Geometry.

概要

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The concrete is an important material to examine the calculation model employed in the evaluation of criticality safety for nuclear fuel cycle facility. Therefore, the data of the reflection and the isolation effects on reactivity were experimentally obtained using the Tank-type Critical Assembly (TCA). Critical experiments were performed for both the single and coupled cores where low-enriched-uranium fuel rods were arranged in a rectangular parallel-piped geometry. For the single core, the concrete slabs were positioned at one side of the core, whereas they were positioned between two cores for the coupled core to measure the reactivity interaction characteristics. Main parameters were selected as the thickness and the boron content of concrete, and the water-level worth method was applied to measure the reflection effect on the single core and the reactivity interaction effect from one core to the other core on the coupled system including symmetric and asymmetric arrangements. Some benchmark calculations were also executed using the SRAC code system to assess the accuracy of this code system. Moreover, the dependency of the reactivity interaction effect on the concrete thickness and the core geometry was examined on the basis of the Avery's two-point model.
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