Abstract
Oxide films on Type 304 stainless steel and carbon steel exposed to boiling water reactor primary cooling water were analyzed, and mechanisms of corrosion and /sup 60/Co accumulation were proposed. Double oxide layers were observed on the stainless steel coupons. The outer layer consisted of well-developed crystals (diameter: 0.5 to 1.0 ..mu..m, probable major oxide form: NiO Fe/sub 2/O/sub 3/), while the inner layer consisted of smaller particles (diameter: 0.1 to 0.3 ..mu..m, probable major oxide form: NiO . (Cr,Fe)/sub 2/O/sub 3/). The depletion of chromium and nickel and the accumulation of impurities in the water, such as /sup 60/Co, zinc, and copper, were observed in the outer layer. For the carbon steel the chromium-rich layer existed at the outer/inner interface. It is considered that the outer and inner layers were a corundum-type oxide (Cr,Fe)/sub 2/O/sub 3/.
Published Version
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