Estimation of the xenon concentration and delayed neutrons precursors densities in the pressurized-water nuclear reactors (PWR) with sliding mode observer considering xenon oscillations

• Published in: Annals of nuclear energy Vol. 77; pp. 1 - 22
• Main Authors: Esteki, M.H., Ansarifar, G.R., Arghand, M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2015
• Subjects: Density; Lyapunov approach; Mathematical models; Normalized axial xenon oscillation; Nuclear power generation; Nuclear reactor components; Nuclear reactors; Oscillations; Precursors; Pressurized-water nuclear reactor; Sliding mode; Sliding mode observer; Two-point nuclear reactor model; Xenon; Pressurized-water nuclear reactor; Sliding mode observer; Lyapunov approach; Two-point nuclear reactor model; Normalized axial xenon oscillation
• ISSN: 0306-4549; 1873-2100
• DOI: 10.1016/j.anucene.2014.10.041

•Sliding mode observer is proposed based on the two point nuclear reactor model.•The stability analysis is provided by means of the Lyapunov approach.•Estimation has been performed taking into account the effects of xenon concentration.•The results show that the sliding mode observer follows the actual system variables. One of the important operations in nuclear power plants is load-following in which the imbalance in axial power distribution induces xenon oscillations. These oscillations must be maintained within acceptable limits otherwise the nuclear power plant could become unstable. Therefore, bounded xenon oscillation is considered to be a constraint for the load-following operation. On the other hands, precursors produce delayed neutrons which are important with respect to reactor period and control, but xenon concentration and precursors densities cannot be measured directly. In this paper, the non-linear sliding mode observer which has the robust characteristics facing the parameters uncertainties and disturbances is proposed based on the two point nuclear reactor model equations with three groups of the delayed neutrons to estimate the xenon concentration and delayed neutrons precursor densities of the pressurized-water nuclear reactor (PWR) using reactor power measurements. The stability analysis is provided by means of the Lyapunov approach, thus the system is guaranteed to be stable over a wide range. The employed method is easy to implement. This estimation is done taking into account the effects of reactivity feedback due to temperature and xenon concentration. Simulation results clearly show that the sliding mode observer follows the actual system variables accurately and is satisfactory in the presence of the parameter uncertainties and disturbances.