BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Thermal channel implementation in FissionIST DTSTART:20260706T090000Z DTEND:20260706T110000Z DTSTAMP:20260803T173713Z UID:14d23514-843e-4074-ba4b-61da0a5a9db2 SEQUENCE:1 CREATED:20260702T095913Z DESCRIPTION: The Fission Reactor Simulator at Instituto Superior Tecnico ( FissionIST) is an educational reactor ´ simulator designed to reproduce t he behaviour of the Reator Portugues de Investigac¸ ˆ ao (RPI) based on ˜ a console interface. Previous work focused primarily on neutron kinetic s and reactor instrumentation\; however\, the absence of the cooling syste ms prevented the simulator from accurately modelling power evolution. This dissertation addresses that limitation through the implementation of a th ermal channel module capable of simulating the reactor cooling circuits an d their coupling with reactor kinetics. A dedicated Cooling Circuits Modul e was developed using a Raspberry Pi 5 integrated with analog and digital interfaces compatible with the existing simulator console. The implemented software models the primary and secondary cooling circuits\, including pu mp dynamics\, heat exchanger behaviour\, cooling tower heat rejection\, an d heat conduction within fuel assemblies. The system also introduces tempe rature-dependent reactivity feedback into the FissionIST neutronic simulat ion\, enabling thermal and neutronic behaviour to evolve simultaneously du ring operation. Simulation results demonstrated behaviour consistent with expected reactor operation under both steady-state and transient condition s. The implemented models reproduced coolant temperature evolution\, flow coastdown dynamics\, and temperature feedback effects\, extending the real ism and instructional capabilities of FissionIST while preserving compatib ility with the original console-based architecture. LAST-MODIFIED:20260702T095913Z LOCATION:Sala P3 (Piso 1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/en/events/thermal-channel-implementat ion-in-fissionist/ X-ALT-DESC;FMTTYPE=text/html:

The Fission Reacto r Simulator at Instituto Superior Tecnico (FissionIST) is an educational r eactor ´ simulator designed to reproduce the behaviour of the Reator Port ugues de Investigac¸ ˆ ao (RPI) based on ˜ a console interface. Previou s work focused primarily on neutron kinetics and reactor instrumentation\; however\, the absence of the cooling systems prevented the simulator from accurately modelling power evolution.

This dissertation address es that limitation through the implementation of a thermal channel module capable of simulating the reactor cooling circuits and their coupling with reactor kinetics. A dedicated Cooling Circuits Module was developed using a Raspberry Pi 5 integrated with analog and digital interfaces compatible with the existing simulator console.

The implemented software m odels the primary and secondary cooling circuits\, including pump dynamics \, heat exchanger behaviour\, cooling tower heat rejection\, and heat cond uction within fuel assemblies. The system also introduces temperature-depe ndent reactivity feedback into the FissionIST neutronic simulation\, enabl ing thermal and neutronic behaviour to evolve simultaneously during operat ion.

Simulation results demonstrated behaviour consistent with e xpected reactor operation under both steady-state and transient conditions . The implemented models reproduced coolant temperature evolution\, flow c oastdown dynamics\, and temperature feedback effects\, extending the reali sm and instructional capabilities of FissionIST while preserving compatibi lity with the original console-based architecture.

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