Smallmodular reactors (SMRs) are be

Smallmodular reactors (SMRs) are beneficial in providing electricity power safely and viable for specific applications
such as seawater desalination and heat production. Due to its inherent safety feature, the modular high
temperature gas-cooled reactor (MHTGR) is considered as one of the best candidates for SMR-based nuclear
power plants. Since its dynamics presents high nonlinearity and parameter uncertainty, it is necessary to develop
adaptive power-level control, which is beneficial to safe, stable, and efficient operation of MHTGR and is easy to
be implemented. In this paper, based on the physically-based control design approach, an adaptive outputfeedback
power-level control is proposed for MHTGRs. This control can guarantee globally bounded closedloop
stability and has a simple form.Numerical simulation results showthe correctness of the theoretical analysis
and satisfactory regulation performance of this control.