Criticality safety analysis is required at various stages of the back-end fuel cycle, i.e. reprocessing, transport, storage and disposal spent nuclear (SNF). To account for reduction in reactivity due to burnup, Burn-Up Credit (BUC) concept was introduced. Evidently, this depends on quality data, particular absorption cross sections some key nuclides. A dedicated programme has been established ...

Abstract In order to facilitate the power control method design of heat pipe nuclear reactor and avoid high complexity core modelling, paper adopts lumped parameter build thermal state dynamic model reactor. Firstly, equivalence structure transfer process “MegaPower” is carried out describe a single in hexagonal block. The complex simplified into two-zone with only fuel monolith. And equivalent...

Silicones are typically cured at room temperature by means of metal catalyst such as tin or platinum. When networks formed, the becomes unrecoverable, which is economic well environmental concern. Very few methods for producing catalyst-free room-temperature-vulcanized (RTV) silicones exist and require conditions unavailable in industrial settings. Through study organic polysilazane (PSz) react...

Accelerator-Driven Systems (ADS) could be employed to incinerate minor actinides and so partly contribute to answer the problem of nuclear waste management. An ADS consists of the coupling of a subcritical fast reactor to a particle accelerator via a heavy material spallation target. The on-line reactivity monitoring of such an ADS is a serious issue regarding its safety. In order to study the ...

In this scientific research, MnO2 nanoparticles (NPs) have been successfully prepared by a precipitation method using KMnO4, MnSO4.H2O and H2O2 (30%) as the precursors. As-prepared sample was identified by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Infrared (IR) techniques. The transmission electron microscopy (TEM) showed 7-8 nm rang...

Two scalable polymerisation methods are used in combination for the synthesis of ethylene and methacrylate block copolymers. ω-Unsaturated methacrylic oligomers (MMAn) produced by catalytic chain transfer (co)polymerisation (CCTP) methyl (MMA) acid (MAA) as reagents radical (E) dimethyl carbonate solvent under relatively mild conditions (80 bar, 70 °C). Kinetic measurements analyses copolymers ...

In the Persian Gulf region, conditions are highly favorable for ozone air pollution and the region is a hot spot of photochemical smog. The vast activities in processing oil and gas play a major role in it. It was found that the elevated concentrations of reactive hydrocarbons co-emitted with nitrogen oxides from Hydrocarbon Processing facilities lead to substantial ozone production. South Pars...

During a Reactivity Initiated Accident (RIA), nuclear fuel cladding experiences multiaxial loading state in which the Pellet-Cladding Mechanical Interaction (PCMI) produces strain biaxiality ratio (εzz/εθθ) of between 0 and 1. This study examines effect on fracture Zircaloy-4 cladding. A new mechanical test has been developed order to apply several levels biaxiality. Digital Image Correlation (...