20.500.12556/DiRROS-27707 Nuclear heating at the JSI TRIGA reactor measurements and simulations Nuclear heating plays an important aspect in design and deployment of both fission and fusion reactors and experimental devices in terms of cooling requirements. Two experimental campaigns in the framework of a collaboration project between the French Atomic and Alternative Energy Commission (CEA) and Jožef Stefan Institute (JSI), Slovenia, have been performed at the JSI TRIGA reactor for the experimental assessment of nuclear heating in fission and fusion-relevant materials by the differential calorimetry technique, based on the CALMOS and CARMEN differential calorimeters, previously developed at CEA. The results of the first campaign performed at reactor powers between 100 and 250 kW have already been reported, highlighting some measurement difficulties. Therefore, the second campaign was performed at a lower reactor power of 30 kW to overcome these issues. Moreover, a computational analysis of the experiments was performed using the JSIR2S code package to calculate the nuclear heating levels. Both experiments and their reproduction by simulations are described in detail. We present a comparison of the previously reported measured nuclear heating values of the first campaign with the computational results, with consistent underestimation by simulations by 8–35%. We report the experimental and computational results for the second experimental campaign performed at a reactor power of 30 kW. The simulated heating values were in agreement with the measurements within the measured heating uncertainty, with simulated heating 2.7–11.3% lower than the experimental values. nuclear heating differential calorimeter R2S (rigorous two-step method) MCNP Eurofer97 Tungsten jedrsko segrevanje diferencialni kalorimeter metoda R2S (stroga metoda dveh korakov) MCNP Jeklo Eurofer97 volfram true false true Springer Nature Angleški jezik Slovenski jezik © The Author(s) 2026 Neznano 2026-02-20 10:03:24 2026-02-20 10:03:25 2026-02-21 03:45:43 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Soavtorja iz Slovenije: Vladimir Radulović, Luka Snoj; Opis vira z dne 9. 2. 2026; str. 1-11 article no. 70 Vol. 37 Feb. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-04-15 2025-07-17 2026-02-02 539.1 2210-3147 10.1007/s41365-025-01877-z 267721475 https://link.springer.com/article/10.1007/s41365-025-01877-z 1 052e0319-0e3b-11f1-9c9d-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=40684 RAZ_Ambrozic_Klemen_2026.pdf RAZ_Ambrozic_Klemen_2026.pdf 1 15E50EEC98EB916CCDEBB14F7C817DAD 31d8b04a89922ebbacca4e652cf97d7060e7688a0b3726c8653e58befd66d2fb 657f9a5f-0e3b-11f1-9c9d-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=40685 Institut Jožef Stefan 0 0 0