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首页> 外文会议>STP 1467; International Symposium on Zirconium in the Nuclear Industry; 20040613-17; Stockholm(SE) >The Effect of Liner Component Iron Content on Cladding Corrosion, Hydriding, and PCI Resistance
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The Effect of Liner Component Iron Content on Cladding Corrosion, Hydriding, and PCI Resistance

机译：衬里成分铁含量对熔覆腐蚀，氢化和抗PCI性能的影响

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This paper focuses on the effect of liner component Fe content on cladding corrosion, hydriding and Pellet-Cladding Interaction (PCI) resistance. A multitude of experimental techniques is used to evaluate the various properties. The PCI resistance is evaluated through mandrel testing of un-irradiated claddings as well as by ramp tests of pre-irradiated fuel segments in the Studsvik R2 reactor. The results from the mandrel testing indicate that an increase of the iron concentration from 0.05 to 0.21 wt% has a rather small impact on the PCI properties. The ramp data, on the other hand, show a clear decrease in the PCI resistance as the Fe content approaches and exceeds 0.19wt%. The phenomena involved in secondary degradation are complex, and separate tests are used to evaluate the corrosion resistance in steam as well as the hydriding resistance in pure hydrogen. The corrosion test includes cladding tubes with ZrSn-liner components with iron concentrations from 0.025 to 0.21 wt%. The results show that the corrosion resistance is dramatically increased as the Fe content is increased from 0.025 to 0.05-0.06 wt%, but that a further increase of the Fe concentration only has a minor impact on the corrosion resistance. However, increasing the Fe content from 0.05 to 0.21 wt% increases the hydrogen pick-up rate. The 0.21 wt% Fe liner has a significantly higher density of Secondary Phase Particles (SPPs) as well as slightly larger SPPs than the 0.05 wt% Fe liner. Consequently, it is believed that the SPPs offer sites where hydrogen can easily be absorbed into the Zr-based material, and the frequency of these sites is important for the hydrogen pick-up rate. It is finally concluded that even though the optimization of the Fe concentration in the liner is complex, an iron level regime exists that provides a good balance of resistance against PCI, corrosion, and hydriding.
机译：本文重点研究了衬里成分Fe含量对熔覆腐蚀，氢化和颗粒-熔覆相互作用（PCI）阻力的影响。使用多种实验技术来评估各种特性。通过对未辐照的包层进行心轴测试以及在Studsvik R2反应堆中对预辐照的燃料段进行斜坡测试，可以评估PCI的抵抗力。心轴测试的结果表明，铁浓度从0.05到0.21 wt％的增加对PCI性能的影响很小。另一方面，当Fe含量接近并超过0.19wt％时，斜率数据显示PCI电阻明显降低。二次降解所涉及的现象很复杂，因此需要使用单独的测试来评估蒸汽的耐腐蚀性以及纯氢的耐氢化性。腐蚀测试包括具有ZrSn衬里成分且铁浓度为0.025至0.21 wt％的包层管。结果表明，随着Fe含量从0.025wt％增加到0.05-0.06wt％，耐蚀性显着提高，但是Fe浓度的进一步增加仅对耐蚀性有很小的影响。然而，将Fe含量从0.05wt％增加到0.21wt％会增加氢吸收率。与0.05 wt％的Fe衬里相比，0.21 wt％的Fe衬里具有显着更高的第二相颗粒（SPPs）密度，并且SPP稍大。因此，据信SPP提供了容易将氢吸收到Zr基材料中的位点，并且这些位点的频率对于氢的吸收速率很重要。最后得出的结论是，即使衬管中Fe浓度的优化很复杂，但仍存在铁水位状态，可以很好地平衡抗PCI，腐蚀和氢化的性能。

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