Search for dissertations about: "Subcritical"

Showing result 1 - 5 of 38 swedish dissertations containing the word Subcritical.

  2. 1. Reactivity Assessment in Subcritical Systems

    Author : Carl-Magnus Persson; Janne Wallenius; Waclaw Gudowski; Annick Billebaud; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Reactor Physics; Nuclear physics; Kärnfysik;

    Abstract : Accelerator-driven systems have been proposed for incineration of transuranic elements from spent nuclear fuel. For safe operation of such facilities, a robust method for reactivity monitoring is required. READ MORE

  4. 2. Development and Investigation of Reactivity Measurement Methods in Subcritical Cores

    Author : Johanna Wright; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; source modulation method; point kinetics; core loading; reactivity measurement; Feynman-alpha formulae; Accelerator Driven Systems ADS ; subcritical cores;

    Abstract : Subcriticality measurements during core loading and in future accelerator driven systems have a clear safety relevance. In this thesis two subcriticality methods are treated: the Feynman-alpha and the source modulation method. READ MORE

  5. 3. Hydrothermal Liquefaction of Lignin into Bio-Oil

    Author : Huyen Nguyen Lyckeskog; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrothermal conversion; aging; bio-oil; stability; subcritical water; lignin;

    Abstract : Lignin, one of the three main components of lignocellulosic biomass, is the second most abundant organic polymer found on Earth. Nowadays, most of the lignin (almost 99%) produced in the Kraft pulping process is used as internal fuel. READ MORE

  6. 4. On measurement and monitoring of reactivity in subcritical reactor systems

    Author : Carl Berglöf; Janne Wallenius; Vasily Arzhanov; Massimo Salvatores; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; reactor; ADS; accelerator-driven systems; subcriticality determination; noise techniques; pulsed neutron source; reactivity monitoring; Nuclear physics; Kärnfysik;

    Abstract : Accelerator-driven systems have been proposed for incineration of transuranic elements from spent nuclear fuel. For safe operation of such facilities, a robust method for reactivity monitoring is required. Experience has shown that the performance of reactivity measurement methods in terms of accuracy and applicability is highly system dependent. READ MORE

  7. 5. Studies of Accelerator-Driven Systems for Transmutation of Nuclear Waste

    Author : Marcus Dahlfors; Ane Håkansson; Alfred Hogenbirk; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; transmutation; accelerator-driven systems; Energy Amplifier; subcritical reactors; nuclear waste; Monte Carlo simulation; burnup; actinides; fission products; benchmark; nuclear data; neutron cross sections; sensitivity analysis; neutron source; spallation target; n_TOF experiment; neutron time-of-flight; cross section measurement; FLUKA; EA-MC; MCNP; MCNP-X; EADF; TRADE; Kärnfysik; Nuclear physics; Kärnfysik;

    Abstract : Accelerator-driven systems for transmutation of nuclear waste have been suggested as a means for dealing with spent fuel components that pose potential radiological hazard for long periods of time. While not entirely removing the need for underground waste repositories, this nuclear waste incineration technology provides a viable method for reducing both waste volumes and storage times. READ MORE