Microstructural analysis of an HT9 fuel assembly duct irradiated in FFTF to 155 dpa at 443 °C
Microstructural analysis of an HT9 fuel assembly duct irradiated in FFTF to 155 dpa at 443 °C
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HT9 燃料组件管道在 443 °C 下经 FFTF 辐照至 155 dpa 的微观结构分析
DOI：
10.1016/j.jnucmat.2009.06.010
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发表时间：
2009
影响因子：
3.1
通讯作者：
F. Garner
中科院分区：
文献类型：
--
作者：
B. H. Sencer;J. Kennedy;J. Cole;S. Maloy;F. Garner
关于铁素体/马氏体钢辐照响应的大部分数据来自于在定义明确和接近恒定的条件下在实验组件中辐照的简单独立试样，而长寿命燃料组件的部件形状更复杂，将经历环境条件的逐步变化。为了探讨HT 9的电阻孔隙膨胀是否保持在更现实的操作条件下，辐射诱导的微观结构的HT 9铁素体/马氏体六角形管道进行了检查后，在快通量试验反应堆设施（FFTF）的燃料组件的六年辐照。计算出的辐照暴露量和检查位置处管道的平均工作温度为155 dpa，1443 °C。发现位错网络主要由（a/2）<111>Burgers矢量组成。令人惊讶的是，对于如此大的照射剂量，观察到a型<100>间质环。此外，还出现了高密度降水。这两个微观结构特征可能导致0.3%的相当低的溶胀水平。
The majority of data on the irradiation response of ferritic/martensitic steels has been derived from simple free-standing specimens irradiated in experimental assemblies under well-defined and near-constant conditions, while components of long-lived fuel assemblies are more complex in shape and will experience progressive changes in environmental conditions. To explore whether the resistance of HT9 to void swelling is maintained under more realistic operating conditions, the radiation-induced microstructure of an HT9 ferritic/martensitic hexagonal duct was examined following a six-year irradiation of a fuel assembly in the Fast Flux Test Reactor Facility (FFTF). The calculated irradiation exposure and average operating temperature of the duct at the location examined were ∼155dpa at ∼443°C. It was found that dislocation networks were predominantly composed of (a/2)<111> Burgers vectors. Surprisingly, for such a large irradiation dose, type a<100> interstitial loops were observed. Additionally, a high density of precipitation occurred. These two microstructural characteristics may have contributed to the rather low swelling level of 0.3%.