Impact of calcium ions on the oxidative dissolution of UO2-based surrogats for spent nuclear fuel

被引：0

作者：

Zhou, Xiaomao ^{[1
]}

Wang, Lingyu ^{[2
]}

Ai, Yong ^{[1
]}

Li, Teng ^{[2
]}

Wang, Rui ^{[1
]}

Cao, Shengfei ^{[3
,4
]}

Cui, Daqing ^{[2
,5
]}

机构：

[1] Hubei Engn Univ, Sch Chem & Mat Sci, Xiaogan 432000, Peoples R China

[2] China Inst Atom Energy, Dept Radiochem, POB 275 93, Beijing 102413, Peoples R China

[3] Beijing Res Inst Uranium Geol, Beijing 100029, Peoples R China

[4] CAEA Innovat Ctr Geol Disposal High Level Radioact, Beijing 100029, Peoples R China

[5] Studsvik Nucl AB, SE-61182 Nykoping, Sweden

来源：

JOURNAL OF NUCLEAR MATERIALS | 2025年 / 605卷

关键词：

Ca 2+effects; Repository environment; Electrochemistry; UO2; CaxUO2(CO3)32x-4; URANYL-CARBONATE; COMPLEXES; URANIUM; SPECTROSCOPY; CORROSION; SIMFUEL; U(VI);

D O I：

10.1016/j.jnucmat.2024.155563

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigates the impact of calcium ions on the dissolution behavior of UO2 based surrogates for spent nuclear fuel (SNF) in granite-type repositories. The prevalence of calcium ions as one of the main components in groundwater raises questions about their influence on the stability of SNF. Leaching experiments were conducted using pure UO2 and UO2 containing fission product noble metal particles under various conditions. Electrochemical analysis and surface characterization complemented the experiments. The results indicate that Ca2+ accelerates the oxidative dissolution process of the UO2 matrix in simulated groundwater. Additionally, the establishment of a micro corrosion cell between the UO2 matrix and simulated fission product alloy particles further enhances the oxidative dissolution of UO2 in groundwater with or without presence of Ca2+. This research contributes to a better understanding of SNF environmental behavior.

引用

页数：10

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