Mineral-specific heterogeneous neptunium sorption onto geological repository rocks in oxic and anoxic conditions and various temperatures

Konevnik, Yu. V.; Zakharova, Еlena V.; Shiryaev, A. A.; Olds, Travis A.; Burns, Peter C.

doi:10.1016/j.chemgeo.2020.119654

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…Np sorption is thought to occur primarily through surface complexation. In addition, redox‐sensitive RNs such as Np, U, and Tc are known to sorb strongly to Fe(II) minerals such as biotite through redox reactions (Huber et al., 2017; Kienzler et al., 2009; Konevnik et al., 2020). In laboratory batch sorption experiments (Figure 4), Np seems to sorb rather weakly; however, the dependence of K d on particle size is significantly large.…”

Section: Modeling Resultsmentioning

confidence: 99%

A Scaling Approach for Retention Properties of Crystalline Rock: Case Study of the In‐Situ Long‐Term Sorption and Diffusion Experiment (LTDE‐SD) at the Äspö Hard Rock Laboratory in Sweden

Tachi

Ito

Gylling

2021

Water Resources Research

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Crystalline rocks such as granites have been investigated as potential host rocks for the geological disposal of radioactive waste in many countries (e.g., EUR, 2005; NEA, 2012; NASEM, 2015). Radionuclide (RN) transport in fractured crystalline rocks can be conceptualized using a dual-porosity model where RNs are transported by advective water flow through a fracture and are retarded by diffusion and sorption into the surrounding rock matrix (Neretnieks, 1980). RNs can then diffuse from the fracture surfaces into the pore network of the fracture fillings and rock matrix and sorb onto pore walls. RN sorption on fracture surfaces and diffusion into the adjacent rock matrix are a key process influencing the safety of the geological disposal. To develop a realistic model and reliable parameters for long-term safety assessments, it is necessary to understand and quantify RN diffusion and sorption processes in the heterogeneous rock matrix and fracture systems.The different types and scales of heterogeneities that must also be considered for RN transport in fractured crystalline rocks include (a) heterogeneous distribution of minerals and pores in the rock matrix, (b) heterogeneity in mineral and pore distribution near fracture surfaces (e.g., fracture fillings and altered zones near fracture surfaces), and (c) heterogeneous flow distribution in the complex channel structures along fracture openings. As discussed in detail in Tachi et al. (2018), the first heterogeneity (a) in a rock matrix affects sorption and diffusion at a relatively smaller scale. The domain pore spaces between mineral grains and intragranular secondary pores form water-filled, heterogeneous networks with varying diffusion-related geometric factors, such as tortuosity and constrictivity, and accessible reactive surfaces related to sorption (e.

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Section: Modeling Resultsmentioning

confidence: 99%

A Scaling Approach for Retention Properties of Crystalline Rock: Case Study of the In‐Situ Long‐Term Sorption and Diffusion Experiment (LTDE‐SD) at the Äspö Hard Rock Laboratory in Sweden

Tachi

Ito

Gylling

2021

Water Resources Research

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“…Consequently, the DGR for the disposal of the HLW is a relatively favor choice worldwide (Hall et al, 2021). However, the DGR which consists of substantial engineered barriers and nature barriers is quite complex (Konevnik et al, 2020). Furthermore, the thermal-hydraulicmechanical-chemical multi-physics processes usually occur in the DGR (De Lucia et al, 2017;Abootalebi and Siemens, 2018).…”

Section: Disposal Of High-level Nuclear Wastementioning

confidence: 99%

Data-driven machine learning for disposal of high-level nuclear waste: A review

Pfingsten²

2023

Annals of Nuclear Energy

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New Methods and Materials in Nuclear Fuel Fabrication and Spent Nuclear Fuel and Radioactive Waste Management

Винокуров

Kulikova²,

Frolova³

et al. 2023

Advances in Geochemistry, Analytical Chemistry, and Planetary Sciences

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Mineral-specific heterogeneous neptunium sorption onto geological repository rocks in oxic and anoxic conditions and various temperatures

Cited by 5 publications

References 28 publications

A Scaling Approach for Retention Properties of Crystalline Rock: Case Study of the In‐Situ Long‐Term Sorption and Diffusion Experiment (LTDE‐SD) at the Äspö Hard Rock Laboratory in Sweden

A Scaling Approach for Retention Properties of Crystalline Rock: Case Study of the In‐Situ Long‐Term Sorption and Diffusion Experiment (LTDE‐SD) at the Äspö Hard Rock Laboratory in Sweden

Data-driven machine learning for disposal of high-level nuclear waste: A review

New Methods and Materials in Nuclear Fuel Fabrication and Spent Nuclear Fuel and Radioactive Waste Management

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