Simulation of chemical kinetics in sodium-concrete interactions

Zhang, B

doi:10.1016/s1001-8042(06)60012-2

Cited by 7 publications

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“…Because it is found so many detailed studies on the overall of the thermal and chemical processes of SCR in Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14], the results related to the terminating behavior of the SCR are mainly discussed in this paper. Here, 'concrete ablation' means the Na transfers into and reacts with the surface concrete and the reacted concrete transfers into Na pool; 'concrete ablation time' means the start time of the concrete ablation.…”

Section: Resultsmentioning

confidence: 99%

“…Because of the concrete ablation and release of H 2 gas, this reaction is one of the important phenomena in the Na leak accident. In fact, many extensive studies, which have focused on the thermal and chemical processes, were reported worldwide [4][5][6][7][8][9][10][11][12][13][14]. In Japan, the experimental and analytical studies had been carried out in Power Reactor and Nuclear Fuel Development Corporation using Japanese ordinary concrete whose aggregates were graywacke.…”

Section: Introductionmentioning

confidence: 99%

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A study on self-terminating behavior of sodium–concrete reaction

Kawaguchi

Doi

Seino

et al. 2016

Journal of Nuclear Science and Technology

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A sodium-concrete reaction (SCR) is one of the important phenomena to cause the structural concrete ablation and the release of hydrogen (H 2) gas in the sodium (Na) leak accident. In this study, the long-time SCR test had been carried out to investigate the self-termination mechanism under the condition to keep the temperature of Na on the concrete more than the reaction threshold temperature during 24 hours. The test results showed the SCR terminated by itself even if enough amount of Na remained on the concrete. In addition, quantitative data were collected on the SCR terminating behavior such as the temperature, the concrete ablation depth, the H 2 generation behavior and the concentration profiles of Na, silicon (Si), aluminum (Al) and calcium (Ca) in the reaction products after the test. In the concentration profiles, the calculation by the sedimentation diffusion model of the steady state was comparable with the experimental results. Though the reaction products were suspended by H 2 bubbling and Na ablated the concrete surface with the high H 2 generation rate, the reaction products gradually settled down with decreasing of the H 2 generation rate. Therefore, the Na concentration decreases at the reaction front with time and the SCR terminates of itself.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study on self-terminating behavior of sodium–concrete reaction

Kawaguchi

Doi

Seino

et al. 2016

Journal of Nuclear Science and Technology

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“…Notably, the chemical, physical, and mechanical events during the SCR occur under self-generated conditions caused by the SCR. To understand the overall SCR, the specific phenomena of the SCR in each reaction mode for different concrete materials under different conditions have been investigated from chemical, physical, and mechanical viewpoints, − and this could be the basis to establish a sophisticated safety assessment of the next-generation SFRs.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stimulated Liquid Na–CaCO₃ Reaction: A Physicogeometrical Kinetic Approach toward the Safety Assessment of Na-Cooled Fast Reactors

Koga

Kikuchi

2022

Ind. Eng. Chem. Res.

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In this study, we characterized the kinetic features of the thermally stimulated reaction of CaCO 3 with liquid Na as a model process of the liquid Na−structural concrete reaction that possibly occurs under a postulated severe accident in a Na-cooled fast reactor. Two sampling conditions characterized by the dispersion of CaCO 3 powders in liquid Na and the limited contact of liquid Na with the CaCO 3 pellet surface were applied to investigate the kinetics and physicogeometrical mechanism of the liquid Na−CaCO 3 reaction using differential scanning calorimetry (DSC) and morphological observations of the products. Under both sampling conditions, the exothermic liquid Na−CaCO 3 reaction started at the initial contact area of the reactants and proceeded while liquid Na penetrated the CaCO 3 powder and pellet, exhibiting the apparent multistep reaction behaviors. Because of the changes in the geometrical constraints of the liquid Na and CaCO 3 contact induced by different thermal and mechanical events in the reacting system, only the initial reaction step at the initial contact area of the liquid Na and CaCO 3 surface exhibited acceptable repeatability to characterize the kinetic behavior. The kinetic information of the first reaction step was extracted from the exothermic DSC peak for the overall reaction using advanced kinetic approaches to the multistep process, providing the kinetic parameters supported by the defined physicogeometrical scheme of the reaction to be used for simulating the liquid Na−CaCO 3 reaction.

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“…The study also indicated that the vertical interface shows a very different reaction rate evolution from one observed in horizontal interface. ZHANG Bin emphasized the concern on sodium-concrete interaction as a key safety-related issue in safety analysis of liquid metal cooled fast breeder reactors 6 . They described the chemical kinetics simulation under some hypotheses.…”

Section: Introductionmentioning

confidence: 99%

Degradation Behaviour of Limestone Concrete Under Limited Time Sodium Exposure

Sharma

S.K²,

F.C³

2010

Int. Jour. Des. Manf. Tech.

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Sodium leak on concrete structures lead to substantial damage due to thermal and chemical attack. Limestone concrete is widely used on floor, housing sodium components. The present study focuses on degradation behavior of limestone concrete under limited time exposure at 550°C in open air. The reduction in its compressive strength after interaction with liquid sodium was about 29%. Chemical analysis of sodium exposed specimen confirmed a bulk penetration of sodium up to 20 mm depth with localized penetration of 44 mm. A sacrificial limestone concrete layer of 50 mm thickness on structural concrete is recommended for sodium handling areas, for half an hour sodium exposure.

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Simulation of chemical kinetics in sodium-concrete interactions

Cited by 7 publications

References 0 publications

A study on self-terminating behavior of sodium–concrete reaction

A study on self-terminating behavior of sodium–concrete reaction

Thermally Stimulated Liquid Na–CaCO₃ Reaction: A Physicogeometrical Kinetic Approach toward the Safety Assessment of Na-Cooled Fast Reactors

Degradation Behaviour of Limestone Concrete Under Limited Time Sodium Exposure

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Simulation of chemical kinetics in sodium-concrete interactions

Cited by 7 publications

References 0 publications

A study on self-terminating behavior of sodium–concrete reaction

A study on self-terminating behavior of sodium–concrete reaction

Thermally Stimulated Liquid Na–CaCO3 Reaction: A Physicogeometrical Kinetic Approach toward the Safety Assessment of Na-Cooled Fast Reactors

Degradation Behaviour of Limestone Concrete Under Limited Time Sodium Exposure

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Product

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Thermally Stimulated Liquid Na–CaCO₃ Reaction: A Physicogeometrical Kinetic Approach toward the Safety Assessment of Na-Cooled Fast Reactors