Effect of sucrose on the oxidation-reduction conditions and retention of rhenium during vitrification of low-activity waste

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00567778" target="_blank" >RIV/67985891:_____/23:00567778 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/23:43928229

Výsledek na webu

<a href="https://doi.org/10.1016/j.jnucmat.2022.154155" target="_blank" >https://doi.org/10.1016/j.jnucmat.2022.154155</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnucmat.2022.154155" target="_blank" >10.1016/j.jnucmat.2022.154155</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of sucrose on the oxidation-reduction conditions and retention of rhenium during vitrification of low-activity waste

Popis výsledku v původním jazyce

Technetium speciation and solubility during nuclear waste vitrification are affected by oxygen partial pressure in the melt. Thus, reducing agents such as sucrose, which are routinely added to nuclear waste feeds to repress foaming, can significantly affect the volatilization of Tc and increase its retention in glass. Using Re as a surrogate for Tc, we measured the effect of sucrose addition to two low-activity waste melter feeds on the Re retention, oxygen partial pressure, and iron redox as functions of temperature. As expected, Re retention in glass increased as the sucrose content increased. This is attributed to sucrose reaction with nitrates and nitrites in the feed. Destruction of nitrates and nitrites reduces the salt phase fraction and thus likely promotes Re diffusion into the glass-forming melt. In agreement with available literature, we discuss that a modest increase in the sucrose content (compared to current practice) can significantly improve the Tc retention without reducing Fe 2 + to metal. (c) 2022 Elsevier B.V. All rights reserved.

Název v anglickém jazyce

Effect of sucrose on the oxidation-reduction conditions and retention of rhenium during vitrification of low-activity waste

Popis výsledku anglicky

Technetium speciation and solubility during nuclear waste vitrification are affected by oxygen partial pressure in the melt. Thus, reducing agents such as sucrose, which are routinely added to nuclear waste feeds to repress foaming, can significantly affect the volatilization of Tc and increase its retention in glass. Using Re as a surrogate for Tc, we measured the effect of sucrose addition to two low-activity waste melter feeds on the Re retention, oxygen partial pressure, and iron redox as functions of temperature. As expected, Re retention in glass increased as the sucrose content increased. This is attributed to sucrose reaction with nitrates and nitrites in the feed. Destruction of nitrates and nitrites reduces the salt phase fraction and thus likely promotes Re diffusion into the glass-forming melt. In agreement with available literature, we discuss that a modest increase in the sucrose content (compared to current practice) can significantly improve the Tc retention without reducing Fe 2 + to metal. (c) 2022 Elsevier B.V. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/LTAUSA18075" target="_blank" >LTAUSA18075: Analýza pěnění – kritického procesu při přeměně kmene na sklo</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of Nuclear Materials

ISSN

0022-3115

e-ISSN

1873-4820

Svazek periodika

573

Číslo periodika v rámci svazku

JAN 2023

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

154155

Kód UT WoS článku

000904435800007

EID výsledku v databázi Scopus

2-s2.0-85142307701