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对3×3-2小组件加深燃耗考验元件进行了金相检验,元件最高燃耗(以金属U计,全文同)为30917MW·d/t。检验结果表明:锆包壳外表面氧化膜剥落较为严重,内表面氧化膜最大厚度为19.46μm;芯块与包壳平均间隙为24.93μm;包壳最大吸氢量达到190μg/g;芯块平均晶粒尺寸约为15.65μm,部分晶粒有所长大,但无柱状晶出现;芯块气孔率约为5.52％,尺寸小于5μm气孔的体积份额约占总气孔度的29.86％。在该燃耗下,元件仍具有一定的安全裕度。
On the 3 × 3-2 components to deepen the burn test components metallographic examination, the highest component fuel consumption (in terms of metal U meter, full text) is 30917MW · d / t. The test results show that the oxide film on the outer surface of the zirconium cladding is exfoliated more seriously, the maximum thickness of the oxide film on the inner surface is 19.46μm, the average gap between the core and the cladding is 24.93μm, the maximum hydrogen absorption of the cladding reaches 190μg / g, The grain size is about 15.65μm, part of the grains grow up, but no columnar grains appear; the porosity of the core is about 5.52%, and the volume fraction of the pores whose size is less than 5μm accounts for about 29.86% of the total porosity. Under this burnup, the components still have a certain safety margin.