A numerical study for the effect of flow skirt geometry on reactor internal flow

Lee, Gong Hee; Bang, Young Seok; Woo, Seonock; Cheong, Ae Ju; Kim, Do Hyeong; Kang, Min Ku

doi:10.1016/j.anucene.2013.07.005

Cited by 17 publications

(2 citation statements)

References 3 publications

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“…The mass flow rates in center fuel assemblies are higher than that in peripheral fuel assemblies at core inlets [13]. Many researchers have made detailed analysis on the coolant mixing in the reactor, flow field in the reactor pressure vessel, flow distribution at core inlets using CFD methods [14][15][16][17][18][19][20][21][22], however the behavior of single pellet in a reactor nuclear, PWR type, due to variation on inlet temperature and mass flow rate has not been investigated as a fundamental study.…”

Section: Introductionmentioning

confidence: 99%

Simulation on the Effect of Coolant Inlet Temperature and Mass-Flowrate Variations to the Temperature Distribution in Single Pellet Thermal Reactor Core

Yusibani

Helmiza

Fashbir

et al. 2021

J. Penelit. Fis. Apl.

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An important factor in the development of nuclear energy is reactor safety. The performance of heat transfer from nuclear fuel to coolant is the main key to the reactor safety. This paper presents simulation on temperature distribution in two-dimensional laminar flow for single pellet thermal reactor with variation on temperature inlet and mass-flowrate. The OpenFoam platform (SimFlow 3.1) has been used for the computational and numerical analysis. The simulation is carried out on a single pellet with an aspect ratio of 1.2. The variations in the mass velocity of the coolant flow are 10, 100, and 14300 kg×s-1 with a constant coolant temperature of 552 K, and the variations of the input coolant temperature are 300, 552, and 1000 K with a constant mass-flowrate of 10 kg×s-1. The results obtained from the simulation show that for variations in the input coolant temperature of 300, 552, and 1000 K, the fuel temperature can be reduced respectively by 34, 26, and 14 K. At the fastest variation in the coolant mass-flowrate of 14300 kg×s-1, the coolant temperature around the pellet rises by 396 K. The decrease in fuel temperature is significant if the mass-flowrate of the input coolant flow is relatively low.

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Section: Introductionmentioning

confidence: 99%

Simulation on the Effect of Coolant Inlet Temperature and Mass-Flowrate Variations to the Temperature Distribution in Single Pellet Thermal Reactor Core

Yusibani

Helmiza

Fashbir

et al. 2021

J. Penelit. Fis. Apl.

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“…Therefore, detailed knowledge of core inlet flow distribution under such circumstances is necessary for the design and/or improvement of the FDD. In this aspect, the computational fluid dynamics(CFD) approach is now considered as a promising tool for the understanding of local phenomena in PWR downcomer and lower plenum, prediction of pressure drop, improvement of mixing vane design, and thermal-hydraulic analysis of reactor internals (Lee and Bang, 2014;Bae and Kim, 2013;Xu and Michael, 2012;Michael and Regina, 2010;Rohde and Hohne, 2007;Lee and Bang, 2013), and thus is attractive for many engineers concerned with a short design cycle and feasibility. This paper presents a detailed evaluation performed on lower plenum design in a pressurized water reactor.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Lower Plenum Design in Pressurized Water Reactor on Fuel Performance

2016

Rev. Téc. Ing. Univ. Zulia

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Flow distribution device plays an important role in the core inlet performance of the PWR (Pressurized Water Reactor). Its design parameters such as radius and hole diameter have a great influence on the core inlet performance. In this paper, the core inlet mass flow distribution and internal flow field of FDD() models with different radiuses and hole diameters are investigated based on CFD technology. The results show that, with increasing of FDD's hole diameter, the flow rates in central part of the core increase correspondingly and there exists an optimal hole diameter to obtain the best core inlet performance in the range of 80 to 100mm. When the FDD's hole diameter remains constant, increasing the FDD's radius would results in a more concentrated flow distribution, meanwhile the standard deviation of core inlet flow decreases accordingly, which means the uniformity of core inlet flow is much better at large FDD's radius in the investigated range. In order to obtain optimal core inlet performance, it's better to set the hole diameter in the range of 80 to 100mm and increases the FDD's radius properly. Local low and high pressure regions are observed at the positions just below each cold and hot leg, respectively. It seems that the flow distribution has little effect on the flow patterns in the upstream downcomer and when the flow distribution device is removed, the flow patterns in lower plenum would deteriorate seriously.

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Comparative study on the effect of reactor internal structure geometry modeling methods on the prediction accuracy for PWR internal flow distribution

Lee¹,

Bang²,

Woo³

et al. 2014

Annals of Nuclear Energy

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A numerical study for the effect of flow skirt geometry on reactor internal flow

Cited by 17 publications

References 3 publications

Simulation on the Effect of Coolant Inlet Temperature and Mass-Flowrate Variations to the Temperature Distribution in Single Pellet Thermal Reactor Core

Simulation on the Effect of Coolant Inlet Temperature and Mass-Flowrate Variations to the Temperature Distribution in Single Pellet Thermal Reactor Core

Influence of the Lower Plenum Design in Pressurized Water Reactor on Fuel Performance

Comparative study on the effect of reactor internal structure geometry modeling methods on the prediction accuracy for PWR internal flow distribution

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