Crud behaviors in high-temperature water, (I). Characterization of water in JMTR OWL-1 loop.

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The characteristic of corrosion products (crud) in the OWL-1 loop water was first ex-amined, in order to study the deposition behavior of crud on material surfaces. Under the steady operation of the loop, the concentration of the crud, passing through a 0.45 μm millipore-filter (crud-F), was 2030 μg/l and that, being filtered (crud-P), was below 1 μg/l.Both cruds consisted mainly of Fe, with other minor elements, such as Cr, Ni, Mn and Co. The X-ray diffraction analysis of crud-P revealed that M2O3-type compounds constituted around 22% of the total crystalline compounds. The specific activity of 60Co differed between crud-P and -F; the value in the former was larger than that in the latter by an order of magnitude, indicating no occurrence of rapid isotopic exchange of Co between two kinds of cruds. However, the ratio of the amounts of nuclides in crud-P and -F seems to be similar between 58Co and 60Co and between 54Mn and 56Mn. These results have been ascribed not to an isotopic mixing but to the chemical similarity between Ni and Co and between Fe and Mn (all are precursors of 58Co, 60Co, 54Mn and 56Mn).
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