Uptake of niobium by cement systems relevant for nuclear waste disposal: Impact of ISA and chloride
- Authors
- Cevirim-Papaioannou, Nese; Jo, Yongheum; Franke, Karsten; Fuss, Markus; de Blochouse, Benny; Altmaier, Marcus; Gaona, Xavier
- Issue Date
- Mar-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Niobium; Cement; ISA; Chloride; Sorption; Isotopic exchange
- Citation
- CEMENT AND CONCRETE RESEARCH, v.153, pp.1 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- CEMENT AND CONCRETE RESEARCH
- Volume
- 153
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/186263
- DOI
- 10.1016/j.cemconres.2021.106690
- ISSN
- 0008-8846
- Abstract
- The isotope Nb-94 (t(1/2) = 2.04 .10(4) a) is produced during the operation of nuclear reactors due to the neutron activation of Nb-93 present in reactor vessels. Related waste streams will be disposed of in cement-based repositories for low and intermediate level wastes (L/ILW). The retention of niobium by cement was investigated using a combination of Nb-95 and natural Nb-93. Sorption experiments assessed also the impact of isosaccharinic acid (ISA) and chloride on Nb retention, both expected in specific L/ILW. Sorption experiments revealed a strong uptake of Nb by cement. Isotopic exchange with Nb-93 in HCP partly explains Nb-95 uptake, although sorption on C-S-H is tentatively proposed as main retention process. Sorption of Nb is weakly affected by chloride, but decreases importantly at [ISA] >= 10(-3) M reflecting the formation of (Ca-)Nb(V)-ISA complexes. This work provides key inputs to assess Nb-94 retention in the Safety Case context of nuclear waste repositories.
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