Development of the integrated model of MBIR research reactor facility in the SimInTech simulation environment using the PRISET estimate code

Abstract Safety analysis of the reactor facility in the process of design requires the use of not only simulation codes for analyzing processes of different nature but, as well, the use of convenient tools for developing mathematical models of process systems. Simulation tools are expected to support multivariate optimization calculations enabling the designer and/or the developer to verify the adopted design solutions and to update the design, the composition and the operating parameters of process systems. At the same time, entering any amendments in the design and development documentation shall be accompanied by the analysis of their effects not only on the particular system but also on the reactor facility as the whole. Integrated dynamic model provides for the timely and comprehensive computational verification. Integrated model of the MBIR sodium liquid metal cooled nuclear research facility was built as part of the present study using the SimInTech dynamic simulation environment and the PRISET one-dimensional coupled neutronics and thermal hydraulics code. The integrated model designed as the engineering tool represents the software implementation of processes of different nature taking place in the reactor facility and includes mathematical models of all safety-related process systems. Also, the SimInTech dynamic simulation environment and the PRISET code were upgraded as well. The developed user interface, jointly with the model of algorithms, enables integrated calculations for the safety case of the reactor facility. The performed test calculations with the obtained local and integral parameters in transients prove that the integrated model of the MBIR nuclear research facility is serviceable. The structure of the integrated model's simulation tools makes it possible to use it as a simulator in the operating personnel training and as an aid for optimizing the man-machine interface in the development of operator panels. The field of application of the integrated model is not limited by the MBIR facility. It can be used for safety analysis of any pool-type research reactors, research pressurized water reactors, commercial pool-type reactor facilities, as well as liquid metal cooled reactors.