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@PHDTHESIS{Kubelt:773318,
      author       = {Kubelt, Christian Martin},
      othercontributors = {Allelein, Hans-Josef and Zehfuß, Jochen and Pitsch, Heinz},
      title        = {{A}blagerungsverhalten von {K}ernschmelz- und
                      {B}randaerosolen in einem {DWR}-{S}icherheitsbehälter},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2019-11028},
      pages        = {1 Online-Ressource (ii, 194 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2019},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2020; Dissertation, Rheinisch-Westfälische
                      Technische Hochschule Aachen, 2019},
      abstract     = {A main focus of reactor safety research is the mitigation
                      of radiological consequences during a severe accident of a
                      nuclear power plant. In the case of such an event a
                      significant amount of radioactivity is released into the
                      containment in form of aerosols. Knowledge about their size
                      distribution, concentration and chemical composition during
                      a severe accident scenario is crucial regarding source term
                      estimations for environment and also accident management
                      measures, e.g. the design of venting systems. Even if much
                      knowledge is available concerning aerosol behaviour under
                      the complex boundary conditions of a severe accident, only
                      little is known about the impact of fire aerosols on the
                      characteristics of the nuclear aerosols in the containment
                      atmosphere. The current work is an experimental
                      investigation aiming to examine the potential impact of fire
                      products on core melt species and their depletion behaviour.
                      For this purpose an experimental facility is set up being
                      able to continuously generate, mix and measure chemically
                      representative core melt species and representative cable
                      fire aerosols. As chemically representative core melt
                      species the materials SnO2, CsI, Ag and Cs2MoO4 are used. As
                      representative cable fire products pyrolysis products and
                      soot from under-ventilated as well as well-ventilated
                      combustion of a fire resistant non-corrosive containment
                      cable (FRNC-BX) and soot of a well-ventilated PVC cable fire
                      are generated. Then single components and multi-component
                      aerosols were mixed with fire aerosols in order to study
                      changes in size distribution, concentration, morphology and
                      chemical composition. Results show that the presence of fire
                      aerosols induces physical and chemical interaction. Compared
                      to representative core melt aerosols, cable fire aerosols
                      are a large source of small particles having an aerodynamic
                      number mean diameter of about 0,3 µm, whereas the used core
                      melt aerosol particles are twice as large. Physical
                      interaction leads to a broader size distribution which is
                      shifted to smaller mean particle sizes. The depletion
                      behavior is enhanced for aerosol species with small initial
                      diameters by preventing accumulation of particles in a size
                      range between 1 µm and 3 µm AMMD. This is mainly observed
                      for CsI and Cs2MoO4. For large silver particle, which mainly
                      sediment during depletion, a reduced deposition due to cable
                      fire aerosols is observed. Significant results concern the
                      chemical impact of cable fire aerosols on the composition of
                      CsI particles during the experimental feed-in and depletion
                      phase. Results confirmed that a decomposition of CsI
                      particles under the presence of cable fire products takes
                      place. The decreasing iodine to cesium ratios are leading to
                      the conclusion that volatile, probably organic iodine was
                      formed. Volatile iodine species production is known to be
                      dominated by radiolytic reactions, but an additional
                      production path due to fire aerosol interaction may also
                      have a non-negligible impact on the airborne iodine activity
                      and iodine source term estimation.},
      cin          = {413110},
      ddc          = {620},
      cid          = {$I:(DE-82)413110_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2019-11028},
      url          = {https://publications.rwth-aachen.de/record/773318},
}