Crud behaviors in high-temperature water. (III) Chemical form of cobalt-60 in JMTR OWL-1 loop water.

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概要

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• Solvent extraction of Co with diethyldithiocarbamate (DDC) has been applied to the determination of the chemical state of Co in OWL-1 loop water installed in JMTR. The 7593% of the "soluble" <SUP>60</SUP>Co are in a form to be easily extracted, Co(II)<SUP>2+</SUP>, and 522% are in a form being transformed to an extractable form at pH 5.5. The rest, a few percent, is in non-extractable state, possibly in a fine particle. These results are consistent with the general concept that majority of <SUP>60</SUP>Co in "soluble" fraction is in a state of Co (II)<SUP>2+</SUP> in the primary coolant of nuclear reactor. It is also noticed that in contact with air in alkaline media a slow oxidation of Co (II) (OH)<SUB>2</SUB> to Co (III) (OH)<SUB>3</SUB> tends to occur at an apparent oxidation rate of<BR>-d[ Co (II)]/dt=k[ Co (II)][O<SUB>2</SUB>]<SUP>1/4</SUP>. <BR>This oxidation leads to the decrease of the extractability.

• 一般社団法人 日本原子力学会の論文

著者

• YAMAMOTO Katsumune

  Oarai Research Establishment, Japan Atomic Energy Research Institute

• GOTO Satoshi

  Tokai Research Establishment, Japan Atomic Energy Research Institute

• HOSHI Michio

  Tokai Research Establishment, Japan Atomic Energy Research Institute

• TACHIKAWA Enzo

  Tokai Research Establishment, Japan Atomic Energy Research Institute

• YONEZAWA Chushiro

  Tokai Research Establishment, Japan Atomic Energy Research Institute

関連論文

• Crud Behaviors in High Temperature Water, (II) : Characterization of Corrosion Layer on Type 304 Stainless Steel and Zircaloy-2
• Residence time of crud on surfaces of channel box in JPDR.
• Crud behaviors in high-temperature water, (I). Characterization of water in JMTR OWL-1 loop.
• Crud behaviors in high-temperature water. (III) Chemical form of cobalt-60 in JMTR OWL-1 loop water.

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