Regular Article - Theoretical Physics
Post fission time evolution calculation by FIFRELIN coupled with PHITS and DCHAIN
Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, 319-1195, Naka, Ibaraki, Japan
2 Université Paris-Saclay, CEA, Service d’Etudes des Réacteurs et de Mathématiques Appliquées, 91191, Gif-sur-Yvette, France
3 Commissariatà l’énergie atomique et aux énergies alternatives, DES, IRESNE, DER, Cadarache, 13108, Saint-Paul-Lez-Durance, France
Accepted: 25 July 2022
Published online: 16 August 2022
Fission reaction Monte–Carlo code FIFRELIN is interfaced to a general-purpose radiation transport simulation code PHITS to calculate the time evolution of observables after fission reactions. By feeding the isotopic fission yield data of FIFRELIN to DCHAIN-PHITS, the burn-up calculation functionality of PHITS based on the activation and decay data libraries and the Bateman equation, the time evolution of decay heat from 0.2 to 10 seconds after the U(n,fission) pulse was calculated and compared with literature data. The comparison illustrated that the latest FIFRELIN can accurately predict the time evolution of decay heat, whereas the previous version of FIFRELIN overestimated the decay heat in the first 10 sec. In addition to burn-up calculations, transport simulations of both prompt and delayed radiation can be performed by passing their spectra calculated by FIFRELIN to particle transport functionality of PHITS. This combination helps design detectors, experiments, and shielding based on the accurate fission physics of FIFRELIN. Being interfaced to PHITS, FIFRELIN is a powerful tool for studying the observables of fission reactions.
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