M. Kropik, J. Rataj, M. Sunka, J. Matousek, L. Reisner, M. Jakes
March 22, 2019
A new research reactor protection system was recently installed at the LVR-15 research reactor in UJV Rez, a.s., Czech Republic and at the Triga Mark II research reactor in Atominstitut Vienna; Austria. It was developed by the dataPartner Company, Ceske Budejovice, Czech Republic, supported by a grant from the Czech Ministry of Industry. The new protection system is computer-based and consists of systems for the reactor start up, operation and independent power measurement. Inputs of the protection system are uncompensated fission chambers or compensated boron chambers for measurement of neutrons. Each system consists of analog and digital units. Analog data are converted to digital ones and sent to the digital unit. There were three modifications of the digital unit done for evaluation of data from analog units and necessary power or power rate calculations and generation of safety signals if safety limits are exceeded. After the completion of the protection system, a validation was carried out. Finally, real tests using the VR-1 training reactor at the Czech Technical University in Prague were carried out. Different reactor power progresses were prepared for testing the power and power rate measurement accuracy, then for checking warning and safety signals. All results of the validation and reactor tests were published in detail.