Research Of The On-line Monitoring System Design Method For The Secondary Loop Of A Nuclear Power Plant Part Of A Hybrid Nuclear-Renewable Energy System

As the rapid development of the science,technology and economy in China,environmental problems and energy issues have attracted more and more attention.The energy structure of China is gradually shifting from the energy structure dominated by fossil fuels such as coal to the new energy structure dominated by carbon-free energy such as nuclear energy,wind energy and solar energy.Renewable energy power generation technology such as wind energy,solar energy,tidal energy,etc.is heavily affected by geographical locations and weather conditions,which cannot supply reliable and continuous electricity.Nuclear power generation technology is not widely trusted and develops slowly because there is possibility of core melting,a large amount of nuclear pollution,environmental damage and public health issues.Hybrid nuclear-renewable energy system is a new energy system which combines nuclear energy subsystem and renewable energy subsystem to eliminate the deficiencies of independent nuclear energy system and independent renewable energy system in order to provide stable,reliable,and clean power.There are differences between the hybrid nuclear-renewable energy system and the conventional nuclear power plant.Frequent switching between different energy subsystems is likely to cause rapid deterioration and failure of mechanical equipment in the secondary loop of a nuclear power plant of a hybrid nuclear-renewable energy system.Therefore,a new online monitoring system needs to be designed to ensure the reliability and safety of the hybrid energy system.In this context,an early online monitoring system design method is proposed for the complex secondary loop of a nuclear power plant of a hybrid nuclear-renewable energy system,and applies the method into the secondary loop.Some fault propagation and effects analysis methods are summarized and studied at first.The integrated system failure analysis method combines the advantages of functional failure identification and propagation method,and failure propagation and simulation approach,which is suitable for the reliability analysis of a complex integrated software and hardware system at the conceptual design stage.Based on the integrated system failure analysis method,an early online monitoring system design method was proposed,and the preliminary application was carried out in the secondary loop of a nuclear power plant of a hybrid nuclear-renewable energy system.By using this method,the component models and function models of the second loop were established.The behavior rules and function failure logic of the system were analyzed.Then the simulation process was carried out.The propagation process of component faults in the second loop is discussed.This paper provides support for the maintenance plan of the secondary loop of a nuclear power plant of a hybrid nuclear-renewable energy system.