The Slovak University of Technology in Bratislava and the Czech Technical University in Prague organized the V4 Nuclear Training course. This training course was financially supported by the Visegrad fund. Due to COVID-19 pandemic, the whole course had to be shifted to the online space. On 13th and 14th April 2021, team STU organized the remote simulation workshop, focusing on nuclear data. The aim of the exercise was to evaluate the sensitivity profiles and cross-section induced uncertainties of the GEN IV GFR 2400 reactor, as well as to decrease the calculation bias by utilizing cross-section adjustment techniques. The exercise was performed in interactive way, where students remotely connected to the STU server and performed the required calculations. Afterwards they were given the opportunity to present their results and discuss them with the STU team. In total 20 students from Czech Republic, Hungary, Italy, Poland, Slovakia and USA completed the workshop.