從水質數據解析核能電廠組件腐蝕行為

The Analysis of Corrosion Behavior on Nuclear Plant Components by Using Field Data of Water Quality

核能電廠的主要組件大部份是不鏽鋼及碳鋼。在核能電廠運轉的高溫、高壓水環境下，這些組件材質腐蝕情形與一般低溫環境下有相當差別；而在此環境下，運轉中的電廠無法直接由組件本身獲得組件腐蝕的資料與數據。因此由水質監測所獲得之數據及水質演變趨勢乃成為評估組件腐蝕行為最有效的方法。本篇論文中作者以近期之研究為基礎，探究如何從水質數據解析核能電廠組件腐蝕行為。水質資料主要包括可溶性金屬元素及不可溶金屬。其中如水環境之氧化或還原對材質的影響也將於論文中一併討論。研究結果顯示廠內其他系統因溫度較低，水中腐蝕產物以銹型γ-FeOOH為主要組成；爐內因溫度較高爐水中除了可溶性Cr外其他金屬無論可溶與不可溶均大部份沈積在組件表面上。

The main constitutes of major components in the nuclear power plants are stainless steel and carbon steel. The corrosion behaviors of them in the plant environment of high temperature and high pressure are very different from that of other different environments. It is very difficult to obtain the plant component corrosion information, directly or on-line. However, the alternate effective method to evaluate component corrosion behavior is to use the field data of water quality monitoring. In this paper, the concentrations of insoluble and soluble metals in the plant cooling water are as the investigated objectives. The results show that crud type γ-FeOOH is the major constitute in the balance of plant due to low temperature and all metals except soluble chromium deposit on the component surface in the inner of reactor due to high temperature.