The HICU (High neutron fluence Irradiation of pebble staCks for fUsion) experiment was performed in the High Flux Reactor (HFR) in Petten, NL, in order to irradiate candidate tritium breeder materials in a fusion relevant environment. The presented work focuses on the post-irradiation examination of the irradiated lithium orthosilicate based breeder pebbles. The pebble samples showed three different contents of Li-6 and were irradiated at two different temperatures and in mechanically constrained and unconstrained state. In this particular publication, the influences of the irradiation conditions on the pebble morphology, microstructure, porosity, and mechanical strength are addressed.

The results indicate that in general a high irradiation temperature seems to be advantageous for maintaining the mechanical strength of the irradiated pebbles. A higher mechanical strength and a significantly lower closer porosity is observed for samples that were irradiated at high temperatures in comparison to pebbles that were irradiated at low temperatures. The effects on the pebble properties with respect to the Li-6 content are small in contrast to effects of the irradiation temperature. With an increased Li-6 content, no deterioration of the material properties was observed, especially for samples irradiated at high temperatures.

为了在融合相关环境中辐照候选tri育种材料，在NL Petten的高通量反应堆（HFR）中进行了HICU（用于中子碎石的高中子注量辐照）实验。提出的工作重点放在辐照的正硅酸锂基种鹅卵石的辐照后检查。卵石样品显示出Li-6的三种不同含量，并在两种不同的温度下以机械约束和非约束状态进行辐照。在该特定出版物中，讨论了辐照条件对卵石形态，微观结构，孔隙率和机械强度的影响。

结果表明，一般而言，高辐照温度对于保持被辐照的卵石的机械强度似乎是有利的。与在低温下辐照的鹅卵石相比，在高温下辐照的样品具有更高的机械强度和更低的孔隙率。相对于Li-6含量，对卵石性质的影响与照射温度的影响相比较小。随着Li-6含量的增加，没有观察到材料性能的劣化，特别是对于在高温下辐照的样品。