The influence of ocean conditions on thermal-hydraulic characteristics of a passive residual heat removal system

Xi, Mengmeng; Wu, Yingwei; Tian, Wenxi; Su, G.H.; Qiu, Suizheng

doi:10.1016/j.pnucene.2015.08.010

Cited by 27 publications

(5 citation statements)

References 20 publications

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“…e detailed equations of the pressurizer can be found in the published original paper [15]. e adiabatic assumption was applied to the pipe and plenums in the natural circulation system.…”

Section: Pressurizer Modelmentioning

confidence: 99%

Theoretical Study on the Characteristics of Critical Heat Flux in Rectangular Channel of Natural Circulation under Motion Conditions

Cai

Chu

et al. 2020

Science and Technology of Nuclear Installations

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With the wide application of sea-based reactors, the impact of ocean conditions on the safety performance of reactors has gradually attracted attention. In this paper, by establishing the thermal hydraulic transient analysis model and the critical heat flux (CHF) model of natural circulation system, the CHF characteristics in the rectangular channel of natural self-feedback conditions under ocean conditions are studied. The results show that the additional acceleration field generated by ocean conditions will affect the thermal hydraulic parameters of the natural circulation system, that is, the external macroscopic thermal hydraulic field. On the other hand, the boiling crisis mechanism will be affected, that is, the force on the bubble and the thickness of the liquid film. Within the parameters of the study, ocean conditions have a great impact on CHF of natural circulation, and the maximum degradation of CHF is about 45%. The obtained analysis results are significant to the improvement of design and safety operation of the reactor system.

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“…e detailed equations of the pressurizer can be found in the published original paper [15]. e adiabatic assumption was applied to the pipe and plenums in the natural circulation system.…”

Section: Pressurizer Modelmentioning

confidence: 99%

Theoretical Study on the Characteristics of Critical Heat Flux in Rectangular Channel of Natural Circulation under Motion Conditions

Cai

Chu

et al. 2020

Science and Technology of Nuclear Installations

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“…Different from the land-based stationary working conditions, the flow of the primary side of the OTSG is influenced by sea waves and winds under ocean conditions. The stagnation or reverse flow of the fluid may reduce the ability to remove heat from the reactor core, which threatens the reactor's safe operation (Xi et al, 2015;Zeng et al, 2023). Therefore, it is necessary to study the effects of ocean conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Chen,

Lu,

Gao

et al. 2024

Front. Energy Res.

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The flow characteristics of the primary side of the helical coil once-through steam generator (OTSG) have a significant impact on the safe operation of the reactor. Different from the land-based stationary working conditions, the flow of the primary side of the OTSG is influenced by sea waves and winds under ocean conditions. The rigid body motion model is used to calculate the flow of the primary side under different ocean conditions, including heeling, trimming, rolling, pitching, heaving, and combined conditions. The results show that under heeling and trimming conditions, the static pressure of the primary side is different from that under vertical conditions due to the influence of gravity, but its impact on the flow field is relatively small. Under rolling and pitching conditions, the mean flow velocity and pressure drop change periodically with the movement of the OTSG, and the smaller the sway angle, the smaller the variation amplitude of the mean flow velocity and pressure drop. Under the heaving condition, the variation amplitude of the mean flow velocity is greater than that under rolling and pitching conditions, and reverse flow occurs. Under the combined heaving and rolling condition, the mean flow velocity and pressure drop are influenced by the period and amplitude of both the two motions.

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“…Numerous studies have been conducted on thermal hydraulics for reactors in the ocean environment [1][2][3][4]. Recently, there have been several review papers on the thermal-hydraulic properties of reactors in oceanic environments [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Natural convection regulates heat transfer when the rolling motion is minimal. The influence of ocean conditions on the thermal-hydraulic characteristics of a passive residual heat removal system is theoretically studied by Xi et al [1]. It is observed that the amplitudes and periods of oscillations in the system parameters are controlled by the movements of the ocean.…”

Section: Introductionmentioning

confidence: 99%

Study on the Density Wave Instability in Natural Circulation System under Rolling Conditions

Gong

Zhang

Gui

et al. 2023

International Journal of Energy Research

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In the ocean environment, the thermal fluid system installed on the ship moves with the waves. This unsteady transient motion imposes additional body forces on the liquid. Thereby, the thermohydraulic properties of the thermal fluid system are changed, especially for natural circulation systems with a low driving force. Flow instability related to system security is a common two-phase flow system phenomenon. It is an essential subject in the study of thermal-hydraulic characteristics. In this paper, the density wave instability in a low-pressure natural circulation system with several parallel heating channels in the circumstances of rolling motion is studied by PNCMC (Program for Natural Circulation under Motion Condition). PNCMC is a newly developed program by adding extra body force induced by ship motions in two-phase’s momentum equations. The mechanism of rolling motion and its impact on flow oscillation and unstable boundary power are investigated. The supercooled boiling caused by the higher surface heat flux firstly promotes the occurrence of density wave oscillations between parallel heating channels. When enough steam enters the riser, the system density wave oscillation occurs under the gravity pressure drop-flow rate-vapor fraction feedback. A more complicated compound oscillation is created by superimposing the interchannel oscillation and the system density wave oscillation. If the rolling motion has little change to the natural circulation flow, when density wave instability arises, the flux oscillation rule and the instability boundary power are basically consistent with the vertical conditions. When the rolling angle is large, the fairly large amplitude flow oscillation generated by rolling will prevent density wave instability from occurring and force the flow oscillation to obey the law of rolling effects.

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The influence of ocean conditions on thermal-hydraulic characteristics of a passive residual heat removal system

Cited by 27 publications

References 20 publications

Theoretical Study on the Characteristics of Critical Heat Flux in Rectangular Channel of Natural Circulation under Motion Conditions

Theoretical Study on the Characteristics of Critical Heat Flux in Rectangular Channel of Natural Circulation under Motion Conditions

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Study on the Density Wave Instability in Natural Circulation System under Rolling Conditions

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