A Coupled Modeling Simulator for Near-Field Processes in Cement Engineered Barrier Systems for Radioactive Waste Disposal

Benbow, Steven; Kawama, Daisuke; Takase, Hiroyasu; Shimizu, Hiroyuki; Oda, Chie; Hirano, Fumio; Takayama, Yusuke; Mihara, Morihiro; Honda, Akira

doi:10.3390/cryst10090767

Cited by 4 publications

(7 citation statements)

References 25 publications

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“…In developing a new analytical approach, Benbow et al (2020) demonstrated that coupling of non-linear processes could be achieved by coupling of the computer programs MACBECE (JAEA 2018;Ohno et al 2009;Mihara et al 2017), DEAFRAP (JAEA 2018; Shimizu et al 2011) and GARFIELD-CHEM (Benbow et al 2020) as shown schematically in Fig. 2.…”

Section: Introductionmentioning

confidence: 99%

“…For equilibrium reactions, "grid convergence' is not possible with continuum scale numerical methods . For consideration of kinetic reactions, discretization on the mm scale has been identified as a necessary requirement for the numerical solution to agree with the analytical solution , whereas discretization on the cm scale is generally used in long-term reactive-transport simulations to save computation time (Benbow et al 2020;Trotignon et al 2007;Mon et al 2017). Previous experimental studies, for example, those by Sarott et al (1992), Pfingsten (2001) and , have found that thin surface layers of calcite can significantly reduce cement reactivity and mass transport properties due to pore-clogging at the outer cement surface.…”

Section: Introductionmentioning

confidence: 99%

“…This discretization problem is particularly pertinent to the 2D reactivetransport simulations in GARFIELD-CHEM and by coupling, so too, therefore, to the entire analytical approach. Benbow et al (2020) conservatively assumed that no mineral reactions took place in the cracks so that the cracks remained open and fully transmissive. Clogging of the cracks by the precipitation of secondary minerals is potentially very significant (Guppy 1998;Cao, et al 2015;Brunet et al 2016) and so it is important to demonstrate the consequences of this non-linear process with the use of a detailed numerical model.…”

Section: Introductionmentioning

confidence: 99%

“…In the current study, the computer programs MAC-BECE, DEAFRAP and GARFIELD-CHEM developed and coupled by Benbow et al (2020) were extended to enable transient changes in hydraulic and transport properties due to effects of mineral precipitation and dissolution in the crack to be calculated. By so doing, the current study provides a demonstration of the possible coupling of non-linear processes that control concrete degradation and crack development in a TRU waste repository.…”

Section: Introductionmentioning

confidence: 99%

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Cement and Concrete for Nuclear Waste Management

Nakarai¹,

Kosakowski²

2022

ACT

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The safe management and disposal of radioactive wastes are of critical importance for maintaining a sustainable society. In nuclear waste management, cement and concrete are commonly used to immobilize radioactive waste. Cementation is a common technique used for conditioning low-level and intermediate-level radioactive wastes, which should ensure safe interim storage of waste packages, and act as a first long-term barrier during waste disposal. In addition, cement-based materials are utilized for construction and barrier materials in surface disposals for very low-level to low-level waste and deep geological disposals for low-level, intermediate-level, and high-level wastes.Furthermore, recovery from the nuclear disaster at the Fukushima Daiichi Nuclear Power Station (F1NPS) is an important and urgent issue in Japan. To solve the difficult problems associated with radioactive contaminated materials in the plant and in the environment, contributions of cement and concrete technologies are highly expected.The understanding end prediction of the long-term evolution of cement materials interacting with wastes and other barrier materials during interim and final storage is indispensable and needs to be studied by experts from different scientific and engineering disciplines. The very long times associated with the safe disposal of radioactive waste, which are well beyond the lifetime of ordinal engineered structures and therefore not experimentally accessible, make this task even more demanding.In the first part of this special issue, three technical contributions summarize research and development projects for nuclear waste management with cement and concrete technologies in Japan. and Ichikawa and Hamamoto (19-1275) give general overviews on the use of cement-based materials for low-level radioactive waste (LLW) and for high-level radioactive waste (HLW), respectively. Furthermore, Abe and Iida (20-236) present a comparative discussion of approaches used for LLW in Japan and Belgium.In the second part, the contributions concentrate on processes and applications related to the performance assessment of cement and concrete for nuclear waste management. The scientific papers describe sorption experiments with Cl, I, HTO, and C by Nedyalkova et al. (19-811), diffusion experiments with NaCl of leached cement paste by Kurmisawa et al. (19-426), leaching experiments of cement paste with quick setting admixture by Yokozeki et al. (19-1173), immersion experiments of cement-bentonite samples by Nakarai et al. (19-433, 19-447), and chemo-mechanical modelling of degraded concrete by Oda et al. (19-1075).Finally, the third part contains contributions that investigate, in a broad sense, how cement and concrete technologies can be used to deal with the aftermath of the F1NPS nuclear disaster. At first, a technical paper by summarizes the outcome of a research initiative that aimed at identifying the cause and extent of radioactive contamination of concrete at the F1NPS.A set of scientific contributions is related to water abso...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cement and Concrete for Nuclear Waste Management

Nakarai¹,

Kosakowski²

2022

ACT

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show abstract

“…The effects of the admixtures, erosion age, concentration of sulfate solution, and sulfate erosion on the mechanical properties of mortar were investigated by Liu et al [11]. Benbow et al [12] presented the development of a coupled modeling simulator for assessing the evolution of a geological repository in the near field for radioactive waste disposal where concrete is used as backfill.…”

mentioning

confidence: 99%