Formation of zirconium molybdate sludge from an irradiated fuel and its dissolution into mixture of nitric acid and hydrogen peroxide

详细信息    查看全文

• 作者：T. Usami ; T. Tsukada ; T. Inoue ; N. Moriya ; T. Hamada ; D. Serrano Purroy ; R. Malmbeck ; J.-P. Glatz
• 刊名：Journal of Nuclear Materials
• 出版年：2010
• 出版时间：31 July 2010
• 年：2010
• 卷：402
• 期：2-3
• 页码：130-135
• 全文大小：989 K

文摘

In the dissolution step of the PUREX process, a sludge of zirconium molybdate can be generated from zirconium and molybdenum dissolved in the solution. In order to avoid accumulation of sludge, a new cleaning method using a mixture of nitric acid and hydrogen peroxide was developed. In this work, the cleaning method was verified using an irradiated fuel. Cubic crystals of the zirconium molybdate ZrMo₂O₇(OH)₂ were formed upon dissolution of an irradiated PWR fuel. The sludge deposition continued after the completion of the fuel dissolution. A small amount of fissile material was incorporated into the sludge. Although almost the same amount of insoluble residue was present, the sludge could be dissolved with a HNO₃–H₂O₂ solution at 80 °C within 5 h. The sludge formation on the clean Zr surface is inhibited.