Testing and Utilization of Loviisa Full Scope Apros Model in Engineering and Development Simulator

Loviisa Nuclear Power Plant (NPP) includes two PWR units with VVER-440 reactors. The Plant units are commissioned in 1977 and 1980 and have operating license for 50 years. The plant has been in operation over 30 years using mostly original Instrumentation and Control (I&C) systems. A large I&C renewal is needed to guarantee the availability of the plant until the end of the plant lifetime. Simulators are used extensively in Loviisa automation renewal project. Alongside the automation renewal project also Training Simulator will be updated with new state of the art Apros based process models. Apros is a multifunctional simulation software tool developed by Fortum Nuclear Services Ltd and VTT Technical Research Centre of Finland. A full scope Apros model of Loviisa NPP including process, automation and electrical power system models has been developed. Virtual copy of operational I&C provided by Siemens and the safety I&C system provided by Areva has been connected to the Apros model. The Engineering and Development (E&D) simulator plays an essential role in development and testing of process models and simulation software tools that are utilized in the project. The E&D simulator also provides an excellent environment for testing and development of Human Machine Interface (HMI) and operating procedures. Exploitation of a full scope E&D simulator in Loviisa NPP automation renewal project is described in this paper. Software tools developed and used in E&D simulator are introduced and methods used for testing Apros model are discussed. Finally the benefits from multifunctional full scope E&D simulator are concluded. 1 BACKGROUND