Dissolution of synthetic U-DBP and corrosion of stainless steel by dissolution schemes

Guanghui Wang; Yaorui Li; Mingjian He; Meng Zhang; Yang Gao; Hui He; Caishan Jiao

Nuclear Engineering and Technology (May 2023)

Dissolution of synthetic U-DBP and corrosion of stainless steel by dissolution schemes

Guanghui Wang,
Yaorui Li,
Mingjian He,
Meng Zhang,
Yang Gao,
Hui He,
Caishan Jiao

Affiliations

Guanghui Wang: College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China
Yaorui Li: College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China
Mingjian He: College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China
Meng Zhang: College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China
Yang Gao: College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China
Hui He: College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China; Department of Radiochemistry, China Institute of Atomic Energy, Beijing, 102413, PR China; Corresponding author. College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China.
Caishan Jiao: College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, PR China; Corresponding author.

Journal volume & issue: Vol. 55, no. 5
pp. 1644 – 1650

Abstract

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In spent fuel reprocessing, UO2(DBP)2 (U-DBP) can be deposited in stainless steel equipment. U-DBP must be removed by dissolution and the process must not cause corrosion to stainless steel. This study was conducted to find the best scheme for dissolution. U-DBP was manufactured by the titrimetric sedimentation method. The effects of different factors on the dissolution of U-DBP were investigated. For example, solid-liquid ratio, hydrazine carbonate solutions with different mass components, mixed solutions containing different concentrations of H2O2, and different carbonates. The results indicated that U-DBP does not have a regular crystal morphology. With the increase of the solid-liquid ratio and the mass fraction of hydrazine carbonate, the concentration of U(VI) at the dissolution equilibrium increases gradually. The addition of H2O2 has a great promotion effect on the dissolution. However, when the concentration of H2O2 is greater than 0.5 M, the dissolution solution may have an erosive effect on the stainless steel. (NH4)2CO3 can increase the dissolution capacity of dissolved U-DBP, but it may also accelerate the corrosion of stainless steel.

Published in Nuclear Engineering and Technology

ISSN: 1738-5733 (Print)
Publisher: Elsevier
Country of publisher: Korea, Republic of
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: http://www.journals.elsevier.com/nuclear-engineering-and-technology

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