A non-equilibrium control oriented model for the pressurizer dynamics

Pini, Alessandro; Cammi, Antonio; Colombo, Luigi Pietro Maria; Tigliole, A. Borio di

doi:10.1016/j.pnucene.2018.02.017

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…Where q is the net transferred power to the water or steam region (MW). The rate of change of specific enthalpy can be given as in (Ilyas & Aydogan, 2018;Pini et al, 2018;Safaei Arshi et al, 2010) by:…”

Section: Preliminariesmentioning

confidence: 99%

“…These models are classified into two, three, and multi-region models in terms of the number of control volumes. The PZR space of the two region models is divided into steam and water regions (Fazekas et al, 2007;Gábor et al, 2010;Pini et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…However, many transient changes such as bulk flashing (bubble rising) flow rate in the water region of the PZR, the mass flow rates of spray condensation, interface condensation, wall condensation, and rainout (liquid droplet) in the steam region are not included in these models (Fazekas et al, 2007;Gábor et al, 2010). and (Pini et al, 2018) proposed a nonequilibrium two regions triple-volume controloriented model for the PZR dynamics. (Pini et al, 2018)This model divided the steam and water regions in PZR into a moving-boundary control volume filled with saturated steam and water and two control volumes filled with sub-cooled water.…”

Section: Introductionmentioning

confidence: 99%

“…and (Pini et al, 2018) proposed a nonequilibrium two regions triple-volume controloriented model for the PZR dynamics. (Pini et al, 2018)This model divided the steam and water regions in PZR into a moving-boundary control volume filled with saturated steam and water and two control volumes filled with sub-cooled water. Moreover, most of the developed two region models considered that the insurge flow is thoroughly mixed with the liquid volume.…”

Section: Introductionmentioning

confidence: 99%

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A developed analytical model for the pressurizer unit in nuclear power plants

Sheta

Ali

Fikry

et al. 2021

Journal of Radiation Research and Applied Sciences

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The pressure control in the pressurized water reactor (PWR) primary loop is key to secure the safe operation. The pressurizer (PZR) unit is responsible for attaining this task. Thus, the PZR unit's modeling is an important issue for the tracking control purpose and performance analysis concerning the turbine load. This paper develops a mathematical model to accurately predict the PZR unit pressure in the normal and load power changes. The model is a nonequilibrium three region model developed based on the thermodynamics of mass and energy for the water and steam in the PZR. The variations of the pressure and the temperature due to thermodynamic variables (enthalpy, density) and the mechanical work effect are considered in the developed model. The model also addresses other thermodynamic processes such as bulk flashing, spray condensation, interface condensation, wall condensation, and rainout flow. The inlet and outlet flow rates of the primary circuit (PC) and the average temperature and the hot leg temperature are included in the developed model. Based on data generated from the VVER-1200 simulator, parameter estimation, verification, and validation of the developed model through load power changes are achieved. Besides, a comparison with other models given in literature has been performed. This comparison indicated that the developed model is more sensitive against the minimum variation of PZR dynamics. Finally, a closed-loop PZR pressure control system, including a conventional Proportional Integral Derivative (PID) controller, was designed to test the control purpose's developed model. The simulation results over typical load change transients have been demonstrated the feasibility, effectiveness, and accuracy of the developed nonlinear model of PZR for dynamic modeling and control purposes.

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Section: Preliminariesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%