Abstract

Radioactive corrosion product materials collected from the control rod drive mechanism (CRDM) housing in a pressurized water reactor (PWR, HANBIT-1 KNPP) were analyzed using an electron probe micro analyzer (EPMA). It is challenging to analyze the composition of radioactive corrosion products using an EPMA due to the rough surface shape and size, and even more so when the products are stacked in the form of small grains.

The purpose of this study is to determine whether the corrosive products found inside the CRDM housing are stuck in contact with primary coolant or just oxide. In this study, not only was the surface condition of the samples very rough, but the samples that were quantitatively analyzed using a normal method had extremely low electrical conductivity using a normal method. We therefore tested a new semiquantitative analysis method using X-ray image mapping. In this technical note, we propose a method for collecting and analyzing corrosion products adsorbed in the CRDM. Reference papers on radioactive corrosion products collected from the CRDM could not be found.

It is consequently difficult to argue that the method of collecting samples and performing the quantitative analysis suggested in this study is the best, but it can be said that it is an appropriate analysis method. Finally, the usefulness of the semiquantitative analysis is reviewed by verifying the analysis results of radioactive corrosion products collected from the CRDM housing in a PWR.

摘要

使用电子探针显微分析仪 (EPMA) 分析从压水反应堆 (PWR, HANBIT-1 KNPP) 中的控制棒驱动机构 (CRDM) 外壳收集的放射性腐蚀产物材料。由于粗糙的表面形状和尺寸，使用 EPMA 分析放射性腐蚀产品的成分具有挑战性，当产品以小颗粒形式堆叠时更是如此。

本研究的目的是确定在 CRDM 外壳内发现的腐蚀性产品是与主冷却剂接触还是仅与氧化物接触。在这项研究中，不仅样品的表面状况非常粗糙，而且使用常规方法定量分析的样品使用常规方法的电导率极低。因此，我们使用 X 射线图像映射测试了一种新的半定量分析方法。在本技术说明中，我们提出了一种收集和分析吸附在 CRDM 中的腐蚀产物的方法。找不到从 CRDM 收集的有关放射性腐蚀产物的参考文件。

因此，很难说本研究中建议的采集样品和进行定量分析的方法是最好的，但可以说它是一种合适的分析方法。最后，通过验证从 PWR CRDM 外壳收集的放射性腐蚀产物的分析结果，回顾了半定量分析的实用性。