Accurate modeling of different phenomena ( e.g. fluid-dynamics, neutronics...) is fundamental in predicting the behavior of nuclear reactors under nominal and accidental conditions. In this work, new neutronics methods are developed. Their application in safety analyses of nuclear reactors shows that a more accurate modeling can be achieved compared to existing codes.

Since 1967 radioactive wastes have been disposed of in the Asse II salt mine in Northern Germany. A signifi-cant part of these wastes originated from the pilot reprocessing plant WAK in Karlsruhe and consisted of cemented NaNO3 solutions bearing fission products, actinides, as well as process chemicals. With respect to the long-term behavior of these wastes, the licensing authorities requested leaching experiments with full scale samples in relevant salt solutions which were performed since 1979. The experiments aimed at demonstrating the transferability of results obtained with laboratory samples to real waste forms and at the investigation of the effects of the industrial cementation process on the properties of the waste forms. This research program lasted until 2013. The corroding salt solutions were sampled several times and after termination of the experiments, the solid materials were analyzed by various methods. The results present-ed in this report cover the evolution of the solutions and the chemical and mineralogical characterization of the solids including radionuclides and waste components, and the paragenesis of solid phases (corrosion products). The outcome is compared to the results of model calculations. For safety analysis, conclusions are drawn on radionuclide retention, evolution of the geochemical environment, evolution of the density of solutions, and effects of temperature and porosity of the cement waste simulates on cesium mobilization.

Das F+E-Vorhaben INOVUM des Ministeriums für Umwelt, Klima und Energiewirtschaft Baden-Württemberg setzt auf eine breite Kooperation mit Partnern aus Verwaltung, Wissenschaft und Wirtschaft zum gemeinsamen Ausbau der behördlichen Umweltinformationssysteme. Schwerpunkte der Projektphase waren u.a. die Neufassung der Rahmenkonzeption Umweltinformationssystem Baden-Württemberg, servicebasierte Anwendungen, die Weiterentwicklung der Umweltportale, mobile Anwendungen und Kartendienste. The R & D project INOVUM of the Ministry for the Environment, Climate and Energy Baden-Württemberg relies on a wide cooperation with partners from government, science and industry to jointly develop governmental environmental information systems. In the focus of this project phase were, e.g. a revision of the framework concept for the Environmental Information System Baden-Württemberg, service-based applications, the development of environmental portals, mobile applications and map services.

The annual report of the Institute for Nuclear and Energy Technologies of KIT summarizes its research activities and provides some highlights of each working group, like thermal-hydraulic analyses for nuclear fusion reactors, accident analyses for light water reactors, and research on innovative energy technologies: liquid metal technologies for energy conversion, hydrogen technologies and geothermal power plants. The institute has been engaged in education and training in energy technologies.

Das KIT-Zentrum Energie richtet jährlich seine Jahrestagung aus, bei der im regelmäßigen Turnus Promovierende ihre Projekte und aktuellen Ergebnisse präsentieren. Bereits in der Vergangenheit waren Jahrestagungen dem wissenschaftlichen Nachwuchs gewidmet. Zahlreiche Doktorandinnen und Doktoranden stellten ihre Arbeiten in einem Vortrag oder einem Poster vor. Der vorliegende Tagungsband dokumentiert die Beiträge zu den vergangenen Jahrestagungen. Every year the KIT energy center organizes its annual conference as a post-gradual symposium, where Doctoral Students can present their projects and current results. Already in the past, there have been annual conferences, dedicated to the young scientists. Numerous postgraduates presented their works in a presentation or as a poster. These conference proceedings document the contributions to the annual conferences.

Pressure-driven magnetohydrodynamic duct flows in a transverse, wall-parallel and uniform field have been studied by direct numerical. The conducting Hartmann walls give rise to a laminar velocity distribution with strong jets at the side walls, which are susceptible to flow instability. The onset of time-dependent flow as well as fully developed turbulent flow have been explored in a wide range of parameters.

Im Rahmen der Globalisierung der Rohstoffmärkte, der Ausrichtung der Wirtschaft in Richtung Bioökonomie und der Energiewende gewinnt die Biomasse als Nahrungsmittel, Rohstoff und Energieträger für Deutschland zunehmend an Bedeutung. Vor diesem Hintergrund wurde für Deutschland auf Basis der Außenhandelsstatistik ein Überblick über die derzeit mengen- und wertmäßig bedeutendsten Biomasseträger und deren Herkunftsländer erstellt, ausgehend von den Importen für das Jahr 2014. Within the context of globalization of the commodity markets, the orientation of the economy towards bioeconomy and the German Energiewende, biomass as a food, raw material and energy carrier is becoming increasingly important for Germany. Against this background, a detailed overview of the currently most important biomass sources in terms of quantity and value as well as their origin countries was provided for Germany, based on the imports of 2014.

The annual report of the Institute for Nuclear and Energy Technologies of KIT summarizes its research activities and provides some highlights of each working group, like thermal-hydraulic analyses for nuclear fusion reactors, accident analyses for light water reactors, and research on innovative energy technologies: liquid metal technologies for energy conversion, hydrogen technologies and geothermal power plants. The institute has been engaged in education and training in energy technologies.

Ein neuer Modellierungsansatz für die Simulation geschichteter Zweiphasenströmungen wird vorgestellt. Eine einfache Möglichkeit das Zusammenspiel von Turbulenz und Oberflächenwellen zu modellieren, bietet der Zweischichten-Turbulenzansatz. Die Wellenamplitude ist dabei als turbulentes Längenmaß für den Wellenbereich gewählt worden. Sie lässt sich dabei aus statistischen Gleichgewicht zwischen turbulenter kinetischer, turbulenter potentieller und turbulenter Oberflächenenergie berechnen. A new modeling approach for stratified two-phase flows has been developed. The two-layer turbulence model is a simple method to model the interaction between turbulence and surface waves. The wave amplitude is used here as turbulent length scale in the inner wavy region. It can be calculated from a statistical equilibrium between turbulent kinetic, turbulent potential and turbulent surface energy.

The Proceedings of the First Annual Workshop of the Collaborative Project CEBAMA addresses key scientific questions related to the use of cement-based materials in nuclear waste disposal applications. Progress beyond the state-of-the-art is achieved by providing basic knowledge, new experimental data, improved modeling and arguments for the Nuclear Waste Disposal Safety Case. CEBAMA is funded by the European Commission under the Horizon 2020 frame of EURATOM.