One of the simplest nuclear fission reactor designs is the soliton reactor. In these reactors, neutrons reduce the toxicity of fissile materials in a manner that allows new vital areas appear successively. Therefore, the spatial dependence of the neutron flux, specific power density, and associated particle density exhibit wave phenomena of solitons and emerge from the solution of nonlinear partial differential equations, preserving their shape during propagation. The velocity of the burnup Soliton Wave (SW) is related to the density of the initial Nuclear Fuel (NF) in each Neutron Absorber (NA) in the medium. These nonlinear waves can be described by equations describing the atomic flux and density in terms of time and space in the medium. The soliton wave can also be observed in advanced nuclear power systems. Burnup SWs in a propagation medium can be analyzed using the spatial coordinates and position of the NA in a propagation region. The aim of this work is to investigate the burnup SW characteristics by selecting various isotopic neutron absorbers in the slab reactor core. Our computational findings show that the SW burning rate is affected by increasing the diffusion coefficient. However, both the diffusion length and the Length of Transient (LOT) increase with increasing the diffusion coefficient. Interestingly, the ratio of LOT to diffusion length remains constant. Furthermore, while increasing the diffusion coefficient leads to a higher Transient of Time (TOT), the ratio between TOT and characteristic time remains constant. (c) 2026 Atom Indonesia. All rights reserved
In this research, the radiological contamination caused by the Station Blackout (SBO) accident in the Advanced Power Reactor 1400 (APR 1400) reactor was investigated. The results of the investigation of the Fukushima accident in Japan showed that such an event can lead to severe radioactive pollution in the environment surrounding a nuclear power plant. This research assumes that the SBO accident happened at one of the reactors of Unit 1 at the Baraka Nuclear Power Plant. This research mainly focuses on the type and quantity of radioactive materials released into the environment after containment failure occurs. MELCOR 1.8.6 code calculations show that it takes approximately 77.56 hours from the onset of the accident until the failure of the reactor containment building and the subsequent release of radioactive materials. According to these calculations, the largest mass of released radioactive materials is related to noble gases, with about 364.98 kg entering the environment and 5.426 kg of cesium iodide aerosol are released as well. These results demonstrate that the extent of radioactive contamination depends strongly on the type of radioactive species released. (c) 2026 Atom Indonesia. All rights reserved
