Accident safety analysis of flow blockage in an assembly in the JRR-3M research reactor using system code RELAP5 and CFD code FLUENT

Guo, Yuchuan; Wang, Guanbo; Qian, Dazhi; Yu, Hongbin; Hu, Bo; Guo, Simao; Mi, Xiangmiao; Ma, Ji

doi:10.1016/j.anucene.2018.08.031

Cited by 16 publications

(9 citation statements)

References 16 publications

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“…Therefore, it is necessary to analyze the CO 2 diffusion between eggs and the external environment. Fluent (Ansys Inc., Canonsburg, PA, USA) is a popular commercial computational fluid dynamics (CFD) code and is commonly used to analyze fluid distribution 18 . Fabbri et al 19 .…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis and freshness prediction of eggs laid at room temperature

Wang

Curi

et al. 2022

J Sci Food Agric

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BACKGROUND: Respiration is an important physiological activity of eggs and is closely related to their freshness. To further observe the diffusion of carbon dioxide released by egg respiration, we used a respirometer to measure the respiration parameters of eggs stored at room temperature and performed a respiration simulation using Fluent software. This paper also explores the relationship between respiratory intensity, freshness, and storage period. RESULTS:The results demonstrate that the diffusion of carbon dioxide released from the respiration of eggs is related to the characteristics of heavy gas diffusion. By comparison, the simulated value (0.0199 m s −1 ) is close to the experimental value (0.0208 m s −1 ), which indicates that the simulation and analysis results are valid. In addition, the logarithmic model was used to assess the relationship between respiration intensity, Haugh unit, and the yolk index (R 2 values 0.89 and 0.87). The R 2 of the relationship between the real and the predicted Haugh unit value and the yolk index are 0.9 and 0.84 respectively, indicating that the model is a good fit. The equivalent egg age model was established using nonlinear regression, where the correlation coefficient R was 0.888 and P < 0.01, indicating it was both stable and reliable.CONCLUSION: The standard k-ε model is suitable for egg respiration simulation analysis. Respiratory intensity can be used as a potential index for nondestructive testing of egg freshness, which is a new method for nondestructive testing of egg freshness and storage period.

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Section: Introductionmentioning

confidence: 99%

Simulation analysis and freshness prediction of eggs laid at room temperature

Wang

Curi

et al. 2022

J Sci Food Agric

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“…Research reactors are widely used to produce high neutron flux for research, training, education, and irradiation test (Gong et al, 2015;Guo et al, 2018). The fuel assembly used in the research reactors is generally the plate-type fuel assembly, including several fuel plates, two side plates and narrow rectangular channels formed between the fuel plates.…”

Section: Introductionmentioning

confidence: 99%

“…However, fewer thermal-hydraulic investigations of the plate-type fuel assembly have taken the subcooled flow boiling into consideration. Guo et al (2018) conducted the thermal-hydraulic analysis of flow blockage in the fuel assembly in the JRR-3M research reactor. The 3dimensional model of the fuel assembly was built and the flow and heat transfer characteristics were simulated using FLUENT.…”

Section: Introductionmentioning

confidence: 99%

“…The 3dimensional model of the fuel assembly was built and the flow and heat transfer characteristics were simulated using FLUENT. Guo et al (2018) found when the blockage ratio of the fuel assembly is 70%, the departure from nucleate boiling will occur. Park et al (2021) investigated the thermalhydraulic behaviors of flow channels of the plate-type fuel assembly by the CFD simulation with a multi-phase flow model.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Conjugated Heat Transfer of the Plate-Type Fuel Assembly in the Research Reactor

Quan

et al. 2021

Front. Energy Res.

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In nuclear reactors, the research of conjugated heat transfer between the fuel and coolant in the fuel assembly is fundamental for improving the safety, reliability and economy. The numerical approach based on Computational Fluid Dynamics (CFD) can be used to realize the rapid analysis of the conjugated heat transfer. Besides, the numerical simulation can provide detailed physical fields that are useful for the designing and optimizing of the fuel assembly. The plate-type fuels are generally used to enhance heat transfer in research reactors with high power density. In this study, a standard plate-type fuel assembly in the research reactor was taken into consideration. The solid-fluid conjugated heat transfer of the fuel assembly and coolant was numerically investigated. In the fluid region, the subcooled flow boiling simulation model was established by implementing the Rensselaer Polytechnic Institute model into the Euler multi-phase flow method. The results show that the conjugated heat transfer of the fuel assembly and coolant can be simulated using the model established in this work. The influence of fluid velocity, power density and the width of the flow channel on the temperature distribution and the conjugated heat transfer was investigated and discussed.

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“…The importance of LOFA and RIA analysis are for safety precaution during operation of research reactor as well as nuclear power plant. Several researches related to flow analysis, LOFA or reactivity in research reactor and nuclear power plant that supporting to this research such as preliminary accident analysis for a conceptual design a 10 MW research reactor [12], dynamic analysis for conceptual core design [14], thermal hydraulic analysis improvement for IEA-R1 reactor [15], characterization of oxide fuel element of RSG-GAS [16], accident safety analysis in JRR-3M [17], analysis of temperature effect on control rod worth in TRR [18], and transient analysis in a downward cooling pool-type material testing reactor [19] reactivity feedback effect on LOFA in PWR [20] and validation using standard code on reactor transient condition [21].…”

Section: Introduction *mentioning

confidence: 99%

Transient Analysis of Simultaneous Lofa and Ria in RSG-Gas Reactor After 32 Years Operation

2020

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During the operation of the research reactor RSG-GAS, there are many design parameters should be verified based on postulated accidents. Several design basis accidents (DBA) such as loss of flow accident (LOFA) and reactivity-initiated accident (RIA) also have been conducted separately. This paper discusses about possibility of simultaneous accidents of LOFA and RIA. The accident analyses carry out calculation for transient condition during RIA, LOFA, and postulated accident of simultaneous LOFA-RIA. This study aims to conduct a safety analysis on simultaneous LOFA and RIA, and investigate the impact on safety margins. The calculations are conducted by using the PARET code. The maximum temperature of the center fuel meat at nominal power of 30 MW and steady state conditions is 126.10°C and MDNBR of 2.94. At transients condition, the maximum center fuel meat temperature for LOFA, RIA and simultaneous LOFA-RIA are consecutively 132.99°C, 135.67°C and 138.21°C, and the time of reactor trip are 3.2593s, 3.6494s and 2.7118s, respectively. While the MDNBR for LOFA, RIA and simultaneous LOFA-RIA are respectively at transient condition are 2.88, 2.58 and 2.63, respectively. It is shown that, simultaneous LOFA-RIA has the fastest trip time. In this case, the low flow trip occurs first in advance to over power trip. From these results, it can be concluded that the RSG-GAS has adequate safety margin against transient of simultaneous LOFA-RIA.Keywords: RSG-GAS, Simultaneous, LOFA, RIA, PARET

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Accident safety analysis of flow blockage in an assembly in the JRR-3M research reactor using system code RELAP5 and CFD code FLUENT

Cited by 16 publications

References 16 publications

Simulation analysis and freshness prediction of eggs laid at room temperature

Simulation analysis and freshness prediction of eggs laid at room temperature

Numerical Investigation of Conjugated Heat Transfer of the Plate-Type Fuel Assembly in the Research Reactor

Transient Analysis of Simultaneous Lofa and Ria in RSG-Gas Reactor After 32 Years Operation

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