Abstract

Microstructural examination of EK164-ID c.d. steel samples cut from a fuel element cladding is carried out after its operation in a reactor untill the maximum damaging dose of 96 dpa. The critical diameter of void nuclei is estimated from void size distribution histograms. The critical void nucleus diameter is shown to increase with the porosity, which blocks the transition of helium–vacancy nuclei into the class of vacancy voids. This finding, together with the histograms of void size distribution, indicates that the final stage of transient swelling has been reached when new voids are not formed. The growth of voids and their coalescence are responsible for the swelling increasing. Microstructural findings are used to describe the evolution of the radiation porosity in EK164-ID c.d. steel samples at this stage. The remaining service life of fuel elements is estimated using the 15% swelling criterion.

中文翻译：

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奥氏体EK164-ID cd钢在715-815 K辐照剂量对72-92 dpa的破坏剂量时产生的孔隙率

摘要

从燃料元件包壳切下的EK164-ID cd钢样品的微结构检查在反应堆中运行后进行，直到最大破坏剂量为96 dpa。空隙核的临界直径由空隙尺寸分布直方图估算。临界空核直径随孔隙率的增加而增加，这阻止了氦空核向空洞的过渡。这一发现与空隙尺寸分布的直方图一起表明，当不形成新空隙时，已经达到了瞬态溶胀的最后阶段。空隙的增长及其聚结是造成膨胀增加的原因。显微组织的发现被用来描述现阶段EK164-ID cd钢样品中辐射孔隙率的演变。