Radioactive Waste Management of Fusion Power Plants

This chapter outlines the attractive environmental features of nuclear fusion, presents an integral scheme to manage fusion activated materials during operation and after decommissioning, compares the volume of fusion and fission waste, covers the recycling, clearance, and disposal concepts and their official radiological limits, and concludes with a section summarizing the newly developed strategy for fusion power plant

New linear plasma devices in the trilateral euregio cluster for an integrated approach to plasma surface interactions in fusion reactors

New linear plasma devices are currently being constructed or planned in the Trilateral Euregio Cluster (TEC) to meet the challenges with respect to plasma surface interactions in DEMO and ITER: i) MAGNUM-PSI (FOM), a high particle and power flux device with super-conducting magnetic field coils which will reach ITER-like divertor conditions at high magnetic field, ii) the newly proposed linear plasma device JULE-PSI (FZJ), which will allow to expose toxic and neutron activated target samples to ITER-like fluences and ion energies including in vacuo analysis of neutron activated samples, and iii) the plasmatron VISION I. a compact plasma device which will be operated inside the tritium lab at SCK-CEN Mol, capable to investigate tritium plasmas and moderately activated wall materials. This contribution shows the capabilities of the new devices and their forerunner experiments (Pilot-PSI at FOM and PSI-2 Julich at FZJ) in view of the main objectives of the new TEC program on plasma surface interactions. (C) 2011 Forschungszentrum Julich, Institut fur Energieforschung-Plasmaphysik. Published by Elsevier B.V. All rights reserved

Evidence for Dose-rate Effect in Gamma-radiolysis .2. Methylmethoxyacetate in 2,3-dimethylbutane and in Cyclohexane

Solutions of 2,3-dimethylbutane (DMB) and cyclohexane containing a captodative solute, methylmethoxyacetate (MMA), were irradiated (continuous wave). Alkane dimeric products were analysed by capillary gas chromatography. G-yields were estimated as a function of the concentration of the captodative solute. By reaction with alkyl radicals, the captodative solute gives the free radical stabilized by the captodative effect. Combination reaction of this radical with itself or with alkyl radicals gives solute or mixed dimer which were also analysed. A large intensity effect was noticed, as was seen in the solutions of n-hexane MMA. Dose effect was definitively rejected

Evidence for a dose rate effect in gamma-radiolysis ? I. Methylmethoxyacetate in aliphatic linear hydrocarbons

NRC publication: Ye

Particularités de l'effet de dose

Si on considère la "courbe de dilution" due à un additif, l'effet de dose d'un composé irradié peut se comprendre comme une addition d'interventions des divers produits de la radiolyse. Pour avoir un "effet de dose", les réactions "secondaires" doivent être possibles ("effet de température" et d'"intensité de dose"). L'irradiation d'un composé dissous simplifie les mécanismes complexes de la radiolyse et l'"effet de dose" si le soluté est un intercepteur efficace de radicaux. Toutefois, il faut éviter de commenter un "effet de dose" lorsque les produits étudiés ne sont pas les plus importants de la radiolyse. La simulation cinétique permet d’éviter ce type d'erreur