Evaluation of the primary displacement damage in the neutron irradiated RBMK-1500 graphite
| Autor: | Elena Lagzdina, R. Plukienė, Artūras Plukis, Danielius Lingis, Vidmantas Remeikis |
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| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Astrophysics::High Energy Astrophysical Phenomena 020209 energy Monte Carlo method 02 engineering and technology 021001 nanoscience & nanotechnology Neutron temperature Computational physics Neutron capture Recoil Nuclear reactor core Neutron flux Atom 0202 electrical engineering electronic engineering information engineering Neutron Nuclear Experiment 0210 nano-technology Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 436:9-17 |
| ISSN: | 0168-583X |
| Popis: | Numerical simulations of the neutron induced primary displacement damage in the RBMK-1500 reactor graphite were performed using the Monte Carlo technique based on the Norgett-Robinson-Torrens (NRT) model. The sequence of the displacement evaluation consists of the reactor core modelling using MCNP6 and GEANT4 codes and output parameters, such as recoil ion and neutron flux distribution used by SRIM2013 and NJOY2016 codes, respectively, to evaluate displacements per atom. The comparisons were made between these codes in order to evaluate the accuracy of each approach. The neutron flux in the spent RBMK-1500 graphite was sufficiently correctly represented by both MCNP6 and GEANT4 models. The comparison between SRIM and GEANT4 codes shows that GEANT4 predicts fewer vacancies by more than 16% than SRIM in the ion energy range from 1 keV to 1 MeV. The neutron energy required to produce recoils due to scattering is around 80 eV. Below this energy displacements occur mostly due to neutron capture reactions. The average displacement rate was found to be around 0.51 displacements per atom per full power year, which corresponds to the 1.36·1014 n/cm2s neutron flux. |
| Databáze: | OpenAIRE |
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