Effect of seawater intrusion on radioactive strontium (<sup>90</sup>Sr) sorption and transport at nuclear power plants

Chang, Seeun; Um, Wooyong; Kim, Won‐Seok; Kim, Hyun-Ju

doi:10.1515/ract-2016-2724

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…The geochemical composition of the rock samples is summarized in Table S2. The SiO 2 and Al 2 O 3 content were significantly higher compared to other minerals in all rock samples, indicating the presence of aluminosilicate precursors such as quartz, albite, amphibole, phlogopite, and feldspar [49]. The concrete exhibited a higher CaO content, two to three times higher than the other rocks, 5 International Journal of Energy Research which can be attributed to the significant calcium content in Portland cement.…”

Section: Resultsmentioning

confidence: 86%

Sorption Behavior of Radionuclides on Engineered and Natural Barriers and Prediction of Sorption Distribution Coefficients Using Support Vector Regression

Lim,

Oh,

Kim

et al. 2023

International Journal of Energy Research

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A low- and intermediate-level radioactive waste repository contains various types of radionuclides and organic complexing agents. Their chemical interaction within the repository can lead to the formation of radionuclide-ligand complexes, influencing the limited retention behaviors of radionuclides. This study focuses on the sorption behavior of radionuclides on both engineered (concrete) and natural barriers (sedimentary rock and granite), as well as the prediction of sorption distribution coefficients (Kd) using support vector regression. Batch studies were conducted to determine the K d values for three radionuclides (99Tc, 137Cs, and 238U) under different conditions, including pH, temperature, and the presence of organic ligands (such as ethylenediaminetetraacetic acid, nitrilotriacetic acid, and isosaccharinic acid). The K d values for 238U exhibited a sharp decrease with increasing concentrations of organic ligands. In contrast, the K d values for 99Tc showed only a slight reduction at higher organic ligand concentrations. Meanwhile, the K d values for 137Cs remained relatively unchanged, regardless of the type and initial concentration of organic ligands. This suggests a high level of retention for 137Cs in the rock samples. The support vector regression model with a radial basis kernel function proved effective in predicting the K d values under different experimental conditions. This enhancement in predicting accuracy contributes valuable insights into understanding the sorption processes involved in radionuclide behavior. Overall, this study advances our knowledge of radionuclide behavior on both engineered and natural barriers while providing a reliable prediction tool for estimating sorption distribution coefficients.

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Section: Resultsmentioning

confidence: 86%

Sorption Behavior of Radionuclides on Engineered and Natural Barriers and Prediction of Sorption Distribution Coefficients Using Support Vector Regression

Lim,

Oh,

Kim

et al. 2023

International Journal of Energy Research

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“…In general, the salinity or ionic strength of groundwater plays an important role in controlling the migration and release of 90 Sr from subsurface soils/sediments. 39 However, previous incubation experiments showed that within a low salinity range (0−4), the increase in groundwater salinity did not promote 90 Sr mobilization. 40 In this study, the groundwater salinity ranged from only 0−1.3, so it was difficult to observe a positive correlation between the 90 Sr activity and salinity of groundwater.…”

Section: Resultsmentioning

confidence: 93%

“…Reportedly, the distribution coefficient of 90 Sr between particles and solution varied little (within a range of 3–4 mL g –1 ) between 5 and 30 °C, so the temperature is not the main factor influencing the 90 Sr activity in groundwater, as demonstrated by our results. In general, the salinity or ionic strength of groundwater plays an important role in controlling the migration and release of 90 Sr from subsurface soils/sediments . However, previous incubation experiments showed that within a low salinity range (0–4), the increase in groundwater salinity did not promote 90 Sr mobilization .…”

Section: Resultsmentioning

confidence: 99%

Fresh Groundwater Discharge as a Major Source of ⁹⁰Sr into the Coastal Ocean

Zhang,

Wang,

Huang

et al. 2023

Environ. Sci. Technol.

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The behavior and source of 90 Sr in the coastal ocean remain uncertain. Here, we investigated the distributions of 90 Sr in coastal fresh groundwater, river water, pore water, and seawater in three bays along the southeastern coast of China between 2019 and 2021 and evaluated the potential of submarine groundwater discharge (SGD) as a source of coastal 90 Sr. The 90 Sr activity in coastal fresh groundwater was higher than that in river water and seawater, while the 90 Sr activity in pore water was comparable to that in adjacent seawater. In addition, nonconservative mixing behavior of 90 Sr along the salinity gradient between river water and seawater was observed. These observations indicated that fresh SGD may serve as an additional source of 90 Sr in coastal seawater. Combining our groundwater 90 Sr data with the reported fresh SGD flux data, the estimated fresh SGD-derived 90 Sr fluxes into the three bays were comparable to or even higher than those supplied by riverine sources. These results revealed that fresh SGD is a major but overlooked source of 90 Sr in the coastal ocean. This subterranean pathway for transport of 90 Sr to the coastal ocean should be considered in the monitoring and risk assessment of coastal areas, especially those near nuclear facilities.

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Predicting the distribution coefficient of cesium in solid phase groups using machine learning

Hong,

Yoon,

Cho

2024

Chemosphere

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Effect of seawater intrusion on radioactive strontium (⁹⁰Sr) sorption and transport at nuclear power plants

Cited by 7 publications

References 33 publications

Sorption Behavior of Radionuclides on Engineered and Natural Barriers and Prediction of Sorption Distribution Coefficients Using Support Vector Regression

Sorption Behavior of Radionuclides on Engineered and Natural Barriers and Prediction of Sorption Distribution Coefficients Using Support Vector Regression

Fresh Groundwater Discharge as a Major Source of ⁹⁰Sr into the Coastal Ocean

Predicting the distribution coefficient of cesium in solid phase groups using machine learning

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Effect of seawater intrusion on radioactive strontium (90Sr) sorption and transport at nuclear power plants

Cited by 7 publications

References 33 publications

Sorption Behavior of Radionuclides on Engineered and Natural Barriers and Prediction of Sorption Distribution Coefficients Using Support Vector Regression

Sorption Behavior of Radionuclides on Engineered and Natural Barriers and Prediction of Sorption Distribution Coefficients Using Support Vector Regression

Fresh Groundwater Discharge as a Major Source of 90Sr into the Coastal Ocean

Predicting the distribution coefficient of cesium in solid phase groups using machine learning

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Product

Resources

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Effect of seawater intrusion on radioactive strontium (⁹⁰Sr) sorption and transport at nuclear power plants

Fresh Groundwater Discharge as a Major Source of ⁹⁰Sr into the Coastal Ocean