Increasing Tc retention during nuclear waste vitrification: Effect of alumina source on the rate of rhenium incorporation into glass

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F25%3A00636319" target="_blank" >RIV/67985891:_____/25:00636319 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22310/25:43933311 RIV/60461373:22810/25:43933311

Result on the web

<a href="https://doi.org/10.1016/j.jnucmat.2025.155916" target="_blank" >https://doi.org/10.1016/j.jnucmat.2025.155916</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnucmat.2025.155916" target="_blank" >10.1016/j.jnucmat.2025.155916</a>

Result language

angličtina

Original language name

Increasing Tc retention during nuclear waste vitrification: Effect of alumina source on the rate of rhenium incorporation into glass

Original language description

Technetium (Tc) volatilization during nuclear waste vitrification poses a significant challenge, necessitating recycle loops that may lead to reduced waste loading in the glass, or secondary Tc treatment in alternative waste forms. Thus, reducing the volatilization of Tc (or Re, its non-radioactive surrogate) is crucial for improving vitrification process efficiency and minimizing the long-term costs associated with nuclear waste management. In our previous study, we demonstrated that using gibbsite, instead of kyanite, as the alumina source in low-activity nuclear waste melter feeds increased the Re retention by up to 20 %, a result attributed to the formation of nanocrystalline alumina in the gibbsite-containing melter feeds. In this work, we show that using boehmite, another Al-source that forms nanocrystalline alumina polymorphs upon heating, results in an even higher retention of Re, by up to 25 %. Using X-ray diffraction and deionized water leaching tests on heat-treated feed samples, we analyzed the compositions of soluble oxyanionic salt phase and the insoluble glass-forming phase as a function of temperature, and evaluated the rate of Re incorporation into the developing transient alkali-alumino-borosilicate melt. We found that the formation of nanocrystalline alumina in the boehmite-containing feed occurred at temperatures approximately 100 °C lower than in the gibbsite feed, accelerating reactions between alumina, oxyanionic salts, and the borosilicate melt, which likely accounts for the enhanced Re retention in the boehmite-containing feeds.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20504 - Ceramics

Project

<a href="/en/project/GA24-11616S" target="_blank" >GA24-11616S: Effect of reducing agents and glass-forming additives on the behavior of rhenium and its retention during vitrification of nuclear waste</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Nuclear Materials

ISSN

0022-3115

e-ISSN

1873-4820

Volume of the periodical

614

Issue of the periodical within the volume

August

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

9

Pages from-to

155916

UT code for WoS article

001502433900001

EID of the result in the Scopus database

2-s2.0-105005954546