The former EU reference lithium orthosilicate based breeder pebbles were exposed to neutron irradiation in the HICU (High neutron fluence Irradiation of pebble staCks for fUsion) experiment to test their stability and tritium release properties under DEMO relevant conditions. The samples, varying by three different Li-6 contents, were exposed to irradiation at two different temperatures and the pebbles were either pre-compacted or not. This second part of the post-irradiation examination is focussing on the tritium release behaviour of the ceramic breeder pebbles.

The irradiation temperature has the strongest influence on the tritium release behaviour. The tritium inventory is significantly higher for samples that were irradiated at low temperatures. A clear trend regarding higher release rates with increasing Li-6 content was not observed. Tritium is released in a multi-staged process as HTO, HT or corresponding fragments. Fits based on the Wigner-Polanyi equation suggest that recombination reactions of tritium with adsorbed species on the pebble's surface play the dominant role in the release process. However, the probability for the recombination of two adsorbed T-species on the surface seems to be too low, as no reliable signal for T₂ was detected.

在HICU（高中子注量辐照用于碎石的燃料）实验中，将前欧盟参考正硅酸锂基种鹅卵石暴露于中子辐照下，以测试其在DEMO相关条件下的稳定性和release的释放性能。将具有三种不同Li-6含量的样品置于两个不同温度下进行辐照，然后将卵石预压实或不压实。辐照后检查的第二部分着眼于陶瓷育种卵石的the释放行为。

辐照温度对the的释放行为影响最大。对于在低温下辐照的样品，inventory的存量要高得多。没有观察到明显的趋势，即随着Li-6含量的增加，释放速率更高。H以多阶段的过程作为HTO，HT或相应的片段释放。根据Wigner-Polanyi方程进行的拟合表明，with与卵石表面吸附物质的重组反应在释放过程中起主要作用。但是，由于未检测到T _2的可靠信号，因此表面上两个吸附的T物种重组的可能性似乎太低。