Sökning: "fast reactor"

Visar resultat 21 - 25 av 92 avhandlingar innehållade orden fast reactor.

  1. 21. Melt-water interactions in a reactor containment : from integrated assesment to phenomenological studies

    Författare :Timo Okkonen; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis examines melt-water interactions for theex-vessel phase of a severe reactor accident. The studies startfrom the development of an assessment methodology that tiestogether the vessel melt release scenarios and the mainprocesses affecting the melt-water interaction effects in thereactor containment. LÄS MER

  3. 22. Experimental and theoretical studies of nitride fuels

    Författare :Merja Pukari; Janne Wallenius; Toru Ogawa; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fast reactor fuel; ab-initio modelling; fuel fabrication; inert matrix nitride fuel;

    Sammanfattning : With respect to nitrides being considered as potential fast reactor fuels, research is conducted on the out-of-pile thermophysical properties, sintering and fabrication processes, gas migration mechanisms, self-diffusion and point defect behaviour of actinide nitrides, their surrogate materials, and the inert matrix material ZrN . The experimental research, carried out in the framework of qualifying fuel for the European Lead Cooled Training Reactor (ELECTRA), shows that sintered ZrN and (Dy,Zr)N pellet densities are influenced by the oxygen concentration in the material. LÄS MER

  4. 23. Modeling of Fission Product Behavior in Fast Reactors

    Författare :Karl Samuelsson; Markus Piro; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Den natriumkylda snabbreaktorn är en av kandidaterna till nästa generationens kärnenergisystem. De extrema förhållanden som kärnbränslet utsätts för i en sådan rektor kan leda till säregna konsekvenser. Till dessa hör formationen av så kallad JOG (franska för Joint Oxyde-Gaine = bränsle-kapsel-fog). LÄS MER

  5. 24. High Performance Fuels for Water-Cooled Reactor Systems

    Författare :Kyle D. Johnson; Janne Wallenius; James Tulenko; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nuclear fuel; accident tolerant fuel; uranium nitride; uranium silicide; Fysik; Physics;

    Sammanfattning : Investigation of nitride fuels and their properties has, for decades, been propelled on the basis of their desirable high metal densities and high thermal conductivities, both of which oer intrinsic advantages to performance, economy, and safety in fast and light water reactor systems. In this time several key obstacles have been identied as impeding the implementation of these fuels for commercial applications; namely chemical interactions with air and steam, the noted diculty in sintering of the material, and the high costs associated with the enrichment of 15N. LÄS MER

  7. 25. Methanation of biosyngas in a fluidized bed reactor

    Författare :Martin Seemann; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENERGY TECHNOLOGY; REGENERATIVE ENERGIES; GASIFICATION OF WOOD; FLUIDIZED BED PROCESSES; CHEMICAL ENGINEERING; FUEL TECHNOLOGY; ALTERNATIVE ENERGIES; METHANATION OF HYDROGEN-CARBONMONOXIDE MIXTURES; SYNTHETIC FUELS; NATURAL GAS; BIOGASES;

    Sammanfattning : Rising prices for fossil fuels and concerns over the climate change increase the interest in renewable energies. Synthetic natural gas (SNG) can be an option, filling the request for alternatives in the transportation sector, where the dependence on the oil is very strong. LÄS MER