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Embrittlement Correlation Method for the Japanese Reactor Pressure Vessel Materials

机译：日本反应堆压力容器材料的脆化相关方法

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A new embrittlement correlation method developed for the Japanese reactor pressure vessel (RPV) steels is presented. The Central Research Institute of Electric Power Industry and the Japanese electric utilities conducted a project to develop a new embrittlement correlation method for the Japanese RPV steels based on the understandings on the mecha?nisms of the RPV embrittlement. In addition to the information from the literatures, we generated new information by characterizing the microstructural changes in the surveillance materials of the Japanese commercial reactors. We found that in low Cu materials, solute atom clusters containing little or no Cu atoms are formed at relatively low fluence of 3x1019 n/cm2, E>1 MeV. The volume fraction of the solute atom clusters has a good correlation with the Charpy transition temperature shift regardless of the Cu content. We also found that the microstructure of the boiling water reactor surveillance material is different from that of the archive material irradiated in material testing reactor. The understandings on the RPV embrittlement mechanisms were formulated using a set of rate equations, and the coefficients of the equations were optimized using the ARTNDT values of the Japanese surveillance database. This method considers the effect of neutron flux. Only one set of coefficients was developed, and they are independent of the product form. Predictions of the new embrittlement correlation method were compared with those of the recent U.S. correlation method as well as the U.S. surveillance data. The comparison shows the characteristics of the present method.
机译：提出了一种用于日本反应器压力容器（RPV）钢的新脆化相关方法。电力工业中央研究所和日本电机专业研究所为日本RPV钢制定了新的脆化相关方法，基于机械的理解，RPV脆化的Nisms。除了来自文献中的信息，我们还通过表征日本商业反应堆监测材料的微观结构变化来产生新的信息。我们发现，在低Cu材料中，含有少或没有Cu原子的溶质原子簇形成在3×1019N / cm 2，E> 1meV的相对低。溶质原子簇的体积分数与夏比转变温度偏移的良好相关性，无论Cu含量如何。我们还发现，沸水反应器监测材料的微观结构与材料检测反应器中施加的档案材料的微观结构不同。使用一组速率方程式制定了关于RPV脆化机制的谅解，并且使用日本监视数据库的ArtNDT值优化方程的系数。该方法考虑中子通量的效果。仅开发了一组系数，它们与产品形式无关。将新脆化相关方法的预测与最近的美国相关方法以及美国监控数据进行了比较。比较显示了本方法的特征。

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