Investigation of Radiolysis in Cement Pastes Immobilizing Simulated Evaporator Concentrates

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00342785" target="_blank" >RIV/68407700:21110/21:00342785 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.anucene.2020.107901" target="_blank" >https://doi.org/10.1016/j.anucene.2020.107901</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.anucene.2020.107901" target="_blank" >10.1016/j.anucene.2020.107901</a>

Result language

angličtina

Original language name

Investigation of Radiolysis in Cement Pastes Immobilizing Simulated Evaporator Concentrates

Original language description

The waste management of radioactive evaporator concentrates (EC) in deep geological repositories requires safe immobilization in a solid matrix, such as cement composites. Radiolysis occurs inside the hydrated cement paste due to irradiation of either free or bonded water. As a result, the generation of hydrogen and the consequent pressure build-up within the material may pose safety risks within the geological repository. Three kinds of cement pastes sealed in steel containers were irradiated by gamma source 60Co to achieve absorbed dose of 1.75 MGy simulating the conditions inside a repository. Specific binder matrix suitable for cement composites immobilizing EC marked as “NP” was studied, as well as the actual simulated immobilized waste (model concentrate) in the binder marked as “NP_C” and a reference paste “PC”. Results showed an increase in pressure of generated gas from the irradiated samples up to 100 kPa. After 120 days of irradiation the reference paste reached steady state, while NP and NP_C continued in the rising trend. However, the absolute values of NP_C were lower than the values of the reference paste, probably due to the presence of dissolved salts in the model concentrates, especially nitrates. The maximum value reached does not present safety risks within the repository, moreover the presence of certain salts in the concentrate has a positive effect on the decrease of the rate and the final values of the pressure build-up.

Czech name

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Czech description

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Type

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

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/TK01030058" target="_blank" >TK01030058: Non-solid radioactive waste permanent disposal technology</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

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

Name of the periodical

Annals of Nuclear Energy

ISSN

0306-4549

e-ISSN

1873-2100

Volume of the periodical

151

Issue of the periodical within the volume

107901

Country of publishing house

GB - UNITED KINGDOM

Number of pages

5

Pages from-to

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UT code for WoS article

000595796000031

EID of the result in the Scopus database

2-s2.0-85092272330