Enhanced air dispersion modelling at a typical Chinese nuclear power plant site: Coupling RIMPUFF with two advanced diagnostic wind models

Liu, Yun; Hong, Li; Sun, Shijie

doi:10.1016/j.jenvrad.2017.04.016

Cited by 26 publications

(5 citation statements)

References 18 publications

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“…The K′ and n′ derived from two temperatures are listed in Table 2. It could be seen that the cyclic strength coefficient and the cyclic hardening exponent are much bigger compared (1)…”

Section: Cyclic Stress-strain Behavior and Fatigue Lifementioning

confidence: 99%

“…In the past few years, nuclear power plant has underwent a rapid development as its extraordinary high efficiency, reliable security as well as so-called environmental friendly facilities [1,2]. As the most critical component of the turbines, the long term reliability of the rotor must be ensured due to the ultra-severe working conditions, including the long time thermal exposure, the complex cyclic loading and even the probable neutron damage [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on LCF Behavior of Welded Joint at Different Temperatures for Bainite Steel

Xiongfei

Cui

et al. 2019

Chin. J. Mech. Eng.

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The current research of low cycle fatigue (LCF) is mainly focused on the components with uniform microstructure. Compared with these typical components, LCF behavior of welded components are more complex due to their great gradient microstructure, especially for different temperature. In this paper, LCF properties were conducted on the welded joint at different temperatures for bainite steel, and the failure mechanism was systematically discussed. Fatigue parameters derived from fitting curves indicated that welded joint had worse plastic deformation resistance and experienced more significantly strain hardening effect at 300 °C. The joint failed in the weld metal at room temperature, which attributed to the softening in weld metal combined with cyclic strain hardening effect in heataffected zone, which meant the joint was more sensitive with the hardness at this condition. When it came to 300 °C, more cracks appeared near to HAZ and the heterogeneous distributed surface inclusion was responsible for the fracture transition to HAZ adjacent to bainite steel rather than the softest zone in HAZ, reflecting the joint was more sensitive with the surface inclusion at 300 °C. This research could support the design on loading of welded component at different temperature, and further ensure the safe operation.

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“…The K′ and n′ derived from two temperatures are listed in Table 2. It could be seen that the cyclic strength coefficient and the cyclic hardening exponent are much bigger compared (1)…”

Section: Cyclic Stress-strain Behavior and Fatigue Lifementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on LCF Behavior of Welded Joint at Different Temperatures for Bainite Steel

Xiongfei

Cui

et al. 2019

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…The gas dispersion model can be used not only in regional ecological monitoring and environmental pollution control but also in emergency response management. The research and applications of the gas dispersion model in the emergency field mainly concentrate on the nuclear accident (Liu et al, 2017;Li et al, 2018;Ulimoen et al, 2022), chemical industrial park (Huang et al, 2019;Cheng et al, 2021), gas pipeline (Mishra et al, 2015 CFD;Yan et al, 2016), and road transportation (Fallah-Shorshani et al, 2015;Kota et al, 2013). Compared with the environmental assessment cases, the emergency simulation often requires a near-field, finer spatial-temporal computational grid and further analysis and adjustment of the model parameters (Rzeszutek, 2019).…”

Section: Introductionmentioning

confidence: 99%

Comparative study on numerical simulation based on CALPUFF and wind tunnel simulation of hazardous chemical leakage accidents

Zhang

2022

Front. Environ. Sci.

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CALPUFF, as a Lagrangian puff modeling system, is mostly used in the field of atmospheric environment research and risk assessment. CALPUFF performs well for short-term and short-range release scenarios over complex terrain, as well as long-term and long-range transportation. Therefore, this article uses the CALPUFF model to simulate a toxic gas leakage accident in a hazardous chemical plant in an urban area, focusing on the influence of local buildings. Wind tunnel experiments are performed in accordance with the CALPUFF experiments to assess the model’s accuracy in cases of chemical leakage accidents. The results of the wind tunnel experiment are superimposed on the map of CALPUFF calculation, and the quantitative analysis is also performed. The comparative results show that the simulation results of the CALPUFF are mainly affected by factors such as wind direction, wind speed, and the complexity of the surface environment. With less influence of buildings, such as the south and north wind, the CALPUFF simulation is consistent with the wind tunnel experiment, having a correlation coefficient of over 0.7 in most cases, while under the east wind, the consistency is significantly lower due to the influence of buildings. In addition, it is found that the wind tunnel experiment is more accurate in the near field of the pollution source, while CALPUFF is more suitable for simulating the overall trend of gas dispersion. The comparison and evaluation of the capabilities of different methods on gas dispersion simulation are helpful in guiding the emergency response during hazardous chemical leakage accidents.

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“…Huang S. X. et al (2018) proposed a pollution source dynamic inversion and grid quantitative traceability algorithm based on CAMx numerical prediction model, which can quickly and quantitatively trace the emission source and contribution rate of air pollution in the next 7 days. Liu Y. et al (2017 used 4DVAR Cost Gradient Function and Truncated Total Teast Squares (TTLS-VAR) to regularize and correct the error between diffusion prediction operator and observation value, which reduced the error of inversion algorithm and improved the accuracy compared with the basic 4DVAR algorithm. Hassan et al (2020) proposed a quantitative traceability algorithm combining improved variational iteration and Laplace transform, and applied it to the inverse solution of fractional nonlinear convection-diffusion equation for the first time.…”

Section: Introductionmentioning

confidence: 99%

Multi-point Sources Continuous Release Inversion Based on Improved Four-Dimensional Variation Method

Han¹,

Zhu²,

Gu³

et al. 2021

Preprint

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the continuous release of multi-point sources is one of the most common cases in the field of air pollution. In order to solve the problem of multi-point sources continuous release inversion, a source intensity and location estimation method based on improved Four-Dimensional Variation is proposed. Firstly, by constructing the diffusion equation of multi-point sources continuous release and the monitoring concentration matrix, the source term inversion model of multi-point sources continuous release is formed. Secondly, the joint transformation method and Taylor series upwind difference method are used to solve the convection-diffusion equation of multi-point sources continuous release, and the numerical solution format of the forward problem is formed through simulation analysis. Furthermore, based on the numerical solution scheme of the forward problem, a four-dimensional variation inversion algorithm for multi-point sources continuous release is constructed, and the flower pollination algorithm is used to improve the inversion accuracy and computational efficiency. Finally, the applicability, feasibility, advantages and disadvantages of the improved four-dimensional variation algorithm are verified by numerical simulation analysis. It is found that the improved four-dimensional variation algorithm can realize the source term inversion under three conditions: the location is known and the intensity is unknown, the intensity is known and the location is unknown, the intensity and the location are all unknown, which the accuracy and computational efficiency can basically meet the actual needs.

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Enhanced air dispersion modelling at a typical Chinese nuclear power plant site: Coupling RIMPUFF with two advanced diagnostic wind models

Cited by 26 publications

References 18 publications

Investigation on LCF Behavior of Welded Joint at Different Temperatures for Bainite Steel

Investigation on LCF Behavior of Welded Joint at Different Temperatures for Bainite Steel

Comparative study on numerical simulation based on CALPUFF and wind tunnel simulation of hazardous chemical leakage accidents

Multi-point Sources Continuous Release Inversion Based on Improved Four-Dimensional Variation Method

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