高温气冷堆包覆燃料颗粒初步辐照考验

Initial irradiation test of coated fuel particles for the HTGR

包覆燃料颗粒是高温气冷堆燃料元件的关键组成部分。辐照考验是检验燃料元件性能的重要环节。为检验中国研制的 10 MW高温气冷试验堆包覆燃料颗粒的质量 ,在德国于利希研究中心的试验堆 FRJ- 2中进行了初步的辐照考验。包覆燃料颗粒装在密闭的容器内进行静态辐照考验。辐照时燃耗约 5 % fima,辐照温度 40 0～ 5 0 0℃。辐照后经宏观检查、瓷相检验以及用γ探测仪检测放射性活度后 ,确认这批包覆燃料颗粒没有释放出裂变产物 ,包覆燃料颗粒完好 。

The coated fuel particle is the key fuel element in the high temperature gas cooled reactor (HTGR). The irradiating test, needed to examine the characteristics of the fuel element, was performed by stafically irradiating, the coated fuel particles for the 10MW HTGR. The coated fuel particles were put in a sealed airtight capsule and irradiated in the FRJ 2 reactor. The measured burnup was about 5 % fima and the irradiation temperature was 400~500℃. The post irradiation examination included burnup measurements, gamma spectrometry, surface inspection, and ceramic graphic examination. The examination results confirm that the coated fuel particles are intact with no defects.