Dissolution behavior of U $_{3}$ O $_{8}$ , FeUO $_{4}$ , and UO $_{2}$ -Zr-stainless steel system samples generated in an oxidative atmosphere in the presence of malonic acid

Tonna, Ryutaro*; Sasaki, Takayuki*; Okamoto, Yoshihiro ; Kobayashi, Taishi*

The dissolution behavior of UO $_{2}$ -Zr-SS samples heated under oxidative conditions, along with the single uranium phases formed in the samples (U $_{3}$ O $_{8}$ and FeUO $_{4}$ ), was investigated through static leaching tests using malonic acid. Malonic acid promoted the dissolution of both U $_{3}$ O $_{8}$ and FeUO $_{4}$ solid phases owing to complex formation. The uranium concentrations of U $_{3}$ O $_{8}$ and FeUO $_{4}$ increased with malonic acid concentration and matched at steady state. In the absence of malonic acid, the U concentration of FeUO $_{4}$ was less than its solubility because of uranium adsorption on an iron hydrolysis solid phase. The uranium concentration after long immersion of the UO $_{2}$ -Zr-SS system samples could be explained by the behavior of U $_{3}$ O $_{8}$ and FeUO $_{4}$ . In the absence of malonic acid, U concentration decreased owing to adsorption onto the iron solid phase, similar to the behavior of FeUO $_{4}$ . In contrast, in the presence of malonic acid, U concentration was consistent with that observed for U $_{3}$ O $_{8}$ and FeUO $_{4}$ .

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	605
Number	:
Pages	:	p.155561_1 - 155561_9
Publication Year/Month	:	2025/02
Meeting title	:
Held date	:
Location (city)	:
Location (country)	:
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.1016/j.jnucmat.2024.155561
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	XAFS; ウラン酸化物; 溶解挙動
Research Facility	:	SPring-8(大型放射光施設)
Press Release	:
JAEA R&D Navigator	:
Cooperating Institute	:

Accesses	:	- Accesses
Web of Science® Times Cited Count	:	Times Cited Count： If you would like to get the latest times cited, please access the Web of Science®. http://www.webofknowledge.com/wos
InCites™	:	Percentile:0.00 Category:Materials Science, Multidisciplinary
Altmetrics	:

Registration No. : AA20240622
JAEA Abstracts No. : 53000481
Paper Submission No. : 29253

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.

Dissolution behavior of UO, FeUO, and UO-Zr-stainless steel system samples generated in an oxidative atmosphere in the presence of malonic acid

Dissolution behavior of U $_{3}$ O $_{8}$ , FeUO $_{4}$ , and UO $_{2}$ -Zr-stainless steel system samples generated in an oxidative atmosphere in the presence of malonic acid