Experimental measurements and theoretical simulation of sodium combustion aerosol leakage through capillaries

Narayanam, Sujatha Pavan; Kumar, Amit; Sen, Soubhadra; Pujala, Usha; Subramanian, V.; Srinivas, C. V.; Baskaran, R.

doi:10.1016/j.pnucene.2019.103111

Cited by 11 publications

(4 citation statements)

References 21 publications

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“…This leads to the total uncertainty in the sampled volume is about ± 1%. Considering all uncertainties, the calculated uncertainty in measured mass concentration is approximately 5% (Narayanam et al, 2020). The microchemistry and morphology of aerosol generated by plasma torch were analyzed by Energy dispersive X-ray (EDAX) spectroscopy and Scanning Electron Microscopy (SEM), respectively.…”

Section: Aerosol Characterization Techniquesmentioning

confidence: 99%

Study on characterization of SrO Aerosols Generated by Optimized Thermal Plasma Torch Aerosol Generator

Kumar,

Usha

2024

Preprint

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Plasma Torch Aerosol Generation System (PTAGS) has been employed to generate nano aerosols with desirable characteristics. The operational parameters of PTAGS installed in the aerosol test facility have been optimized, and aerosols are generated using non-radioactive SrO2 powder. The current-voltage characteristics, electro-thermal efficiency and torch power are studied as a function of the flow rate of the plasma-generating gas (mixture of argon and nitrogen) and the arc current of the plasma torch. The arc characteristics relation is determined using the Nottingham formulation. Based on this, torch parameters are evolved and optimized as 20 kW power, 70% electro-thermal efficiency, 25 L min− 1 flow rate of plasma forming gas, 5 mg min− 1 powder feed rate and for 4–5 min torch operation towards the generation of SrO nano aerosols to achieve 1012 m− 3 and ~ 25 mg m− 3 for the count and mass concentration of aerosol respectively. The initial size distribution of the aerosols is in the few tens of nanometre range (10–40 nm) with a mean diameter of 26 nm (σg = 1.45). SEM and EDAX analysis reveal that the morphology of nano aerosols was nearly spherical and the formation of SrO nanoparticles. A set of operational parameters of PTAGS has been standardized to perform further experiments related to reactor safety analysis. PTAGS shall be tuned for aerosol generation in a large facility to achieve the characteristics equivalent to reactor accidental conditions.

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Section: Aerosol Characterization Techniquesmentioning

confidence: 99%

Study on characterization of SrO Aerosols Generated by Optimized Thermal Plasma Torch Aerosol Generator

Kumar,

Usha

2024

Preprint

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“…Although models to capture plugging behavior have been proposed [54], this phenomenon is not currently included within SRT or the MELCOR SFR models. Past U.S. experimentation on leak plugging is available (see ref [54] for a summary), along with more recent international efforts [55].…”

Section: C52 Leakage and Pathway Plugging Behaviormentioning

confidence: 99%

A Pathway for the Development of Advanced Reactor Mechanistic Source Term Modeling and Simulation Capabilities

Shahbazi

Grabaskas

2021

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“…The quantity of radioactive FPs released to the environment is referred to as the source term and is influenced by both the severity of the accident and the prevailing physical and chemical conditions. The transport of aerosols through these leakages is contingent on various factors such as pressure differentials across the leakage, aerosol concentrations, particle size distributions, dimensions of leakage pathways, and flow rates (Narayanam et al, 2020). To advance the Level 2 probabilistic safety assessment technology and mitigate the potential impact of SAs, it is imperative to gain a comprehensive understanding of the transport and deposition behavior of the accidental source terms.…”

Section: Introductionmentioning

confidence: 99%

Investigations on aerosol transport and deposition behavior during severe reactor accident

HOSAN,

TAKANISHI,

MORITA

et al. 2024

Mechanical Engineering Journal

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The accident at the Fukushima Daiichi Nuclear Power Plant in 2011 led to a core meltdown, resulting in the significant release of radioactive materials into the environment, revealing the urgent need for further in-depth development of Level 2 probabilistic safety assessment technology. To help establish an effective source-term migration evaluation method, this study investigates fission product migration behavior across leak pathways. Specifically, an experimental line is developed, and experiments are performed under conditions that simulate the environmental and flow conditions in containment vessel penetrations and failure locations during a severe accident. The experiments are conducted in narrow circular pipes, which represent the leak pathways in the containment vessel and reactor building, to determine the impact of flow rate, particle size, and flow path size on the decontamination factors. Additionally, a turbulent deposition model that accounts for re-entrainment effects has been developed, and the experimentally obtained decontamination factors are compared with the developed model, as well as a conventional model. The predicted decontamination factors from the present model exhibit similar trends and values to the experimental results.

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Experimental measurements and theoretical simulation of sodium combustion aerosol leakage through capillaries

Cited by 11 publications

References 21 publications

Study on characterization of SrO Aerosols Generated by Optimized Thermal Plasma Torch Aerosol Generator

Study on characterization of SrO Aerosols Generated by Optimized Thermal Plasma Torch Aerosol Generator

A Pathway for the Development of Advanced Reactor Mechanistic Source Term Modeling and Simulation Capabilities

Investigations on aerosol transport and deposition behavior during severe reactor accident

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