Experimental study on circulation characteristics of secondary passive heat removal system for Chinese pressurized water reactor

Wu, Jiangbo; Bi, Qincheng; Zhou, Chengsi

doi:10.1016/j.applthermaleng.2014.12.014

Cited by 25 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the Fukushima nuclear accident, the passive safety design principles are required and indispensable for newgeneration advanced reactors. Natural circulation systems, as a remarkable component of passive safety systems, have been widely applied in nuclear power plants (NPPs) as a result of their simplicity and inherent safety (Wu et al, 2015). With the development of NPPs tending to integration and miniaturization, the structural arrangement of NCS may be different to adapt to different application environments.…”

Section: Introductionmentioning

confidence: 99%

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Sun

Zhang

et al. 2020

Front. Energy Res.

View full text Add to dashboard Cite

Direct contact condensation (DCC) as a complex thermal-hydraulic phenomenon has been the subject of a great deal of research under forced flow conditions. It is an interesting challenge to study the phenomenon in a natural circulation system (NCS). In this paper, the flow behaviors along with DCC phenomena were experimentally investigated by a visualization method in an NCS at low pressure. Moreover, the influence of initial parameters including heat flux, inlet temperature and resistance of the heated section on the NCS was analyzed in detail. The experimental results revealed that two types of DCC phenomena were found in the NCS. When Type I DCC occurs, the interface wave will be formed due to the hydraulic jump caused by the reverse flow of subcooled water. The interface wave easily contributes to the occurrence of Type II DCC due to the Kelvin-Helmholtz instability. In addition, the NCS tends to be more unstable with the increase in the heat flux or the inlet resistance. The influence of inlet temperature on the flow rate should comprehensively consider the changes of outlet parameters and subcooled degree of the steam and the subcooled water.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Sun

Zhang

et al. 2020

Front. Energy Res.

View full text Add to dashboard Cite

show abstract

“…They also found that intermittent boiling and density wave oscillation might occur at a low heat flux, but the instabilities did not have a severe impact on the system operation due to their small amplitudes. Wu et al [24] experimentally studied the overall performance sensitivity of the passive heat removal system in a high-pressure water reactor. Their case study showed that natural circulation can be maintained at different pressures, from one pressure point to another, in the power drop condition as well.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Abadi

Meyer

2018

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

In this study, the effect of the tube inclination angle on simultaneous condensation inside and pool boiling outside a smooth tube is investigated numerically. Such conjugate phase-change phenomena happen in many heat exchangers, particularly in passive heat removal systems. The simulated domain is a pool filled with water liquid at atmospheric pressure, with a submerged tube with inner and outer diameters of 19 mm and 25 mm respectively. The fluid inside the tube is considered to be the steam at the saturation temperature of 250 °C, which is a very common operating condition in many heat removal systems. The flow field is considered to be turbulent, unsteady and three dimensional. The effect of conduction through the tube thickness is also taken into account. The Eulerian-Eulerian multiphase flow approach is utilized to express the governing equation of the problem. ANSYS FLUENT 17.1 is also used to solve the governing equations. The effects of various parameters, such as tube orientation, steam mass flux and inlet steam quality on the condensation and pool boiling heat transfer coefficients, are investigated. The results show good agreement with the available experimental data. The condensation heat transfer coefficient is found to increase with an increase in the inlet steam quality and steam mass flow rate. The results of the effect of inclination on the heat transfer coefficient are also compatible with the previous experimental works. Moreover, the results show that there is a partial maximum point for the total heat transfer coefficient at an inclination angle between θ = -60° and θ = -30°.

show abstract

“…The secondary side decay heat removal has been proved in SPRHR and PASCAL facilities, whose purpose is the safety system assessment, and in ATLAS integral test facility. Wu et al [10] and Kim et al [11] have analyzed and simulated different experiments and their studies have contributed to reaching in-depth knowledge of the system performance.…”

Section: Introductionmentioning

confidence: 99%

Simulation studies on natural circulation phenomena during an SBO accident

Lorduy-Alós

Gallardo

Verdú

2018

Applied Thermal Engineering

View full text Add to dashboard Cite

Natural circulation flow capability for removing decay core power has been demonstrated, and several studies have focused on taking advantage of this fact. This work studies the sequence of events that occur during a station blackout accident, in which natural circulation is the dominant flow pattern in the primary system. To this end, the Test A1.1 carried out in ATLAS facility is analyzed and a TRACE5 model is developed paying special attention on the modeling of heat losses. This phenomenon is very influential in the flow capacity and this is demonstrated through the correlation G~(Q-qloss) m between the net power Q-qloss and the mass flow G, that has been established from simulations under steady-state conditions. The Test A1.1 reproduction shows the TRACE5 code adequacy to investigate natural circulation phenomena, which are difficult to control in a facility. In addition, the heat loss modeling technique using constant heat transfer coefficients is substantiated.

show abstract

Experimental study on circulation characteristics of secondary passive heat removal system for Chinese pressurized water reactor

Cited by 25 publications

References 10 publications

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Simulation studies on natural circulation phenomena during an SBO accident

Contact Info

Product

Resources

About