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  • A study of buoyant backflow in vertical injection lines

    Creator:
    King, John Barry
    Abstract:
    In the event of a small break loss of coolant accident (SBLOCA) in a nuclear reactor, cold fluid is injected through the reactor system high pressure injector to compensate for the coolant loss. When this flow rate is less than a critical value, however, the hot fluid in the cold...
    Resource Type:
    Dissertation
    Full Text:
    a nuclear reactor, cold fluid is injected through the reactor system high pressure injector to

  • Liquid entrainment at an upward oriented vertical branch line from a horizontal pipe

    Creator:
    Welter, Kent B.
    Abstract:
    Under simulated accident conditions, tees in the primary coolant loop of a Pressurized Water Reactor (PWR) can deviate from their original design purpose and become separators that effectively remove core heat sink capacity. This method of primary coolant removal is a phenomelogical subset of phase separation known as liquid entrainment,...
    Resource Type:
    Dissertation
    Full Text:
    Many engineering applications such as food processing, petroleum refining, and nuclear reactor cooling

  • Pressure losses across a 180 degree turn in the AP1000 cooling annulus

    Creator:
    Nelson, Roy K.
    Abstract:
    A one-sixth scaled facility was constructed at Oregon State University to determine the pressure losses around Westinghouse's AP1000 Passive Containment Cooling System. An explanation of the AP1000 Passive Containment Cooling System is given. This study examined the pressure loss and loss coefficient around the 180 degree turn of the Passive...
    Resource Type:
    Masters Thesis
    Full Text:
    Nuclear Regulatory Com- mission (NRC) has determined that current reactor licenses are valid for forty

  • A general theory of flooding implementing the cuspoid catastrophe

    Creator:
    Lafi, Abd Y.
    Abstract:
    The flooding phenomenon can be defined as the maximum attainable flow condition beyond which the well defined countercurrent flow pattern can no longer exist. Thus the countercurrent flow limit (CCFL) or the flooding limit may be thought of as the flow condition at which the strong interaction between the two...
    Resource Type:
    Dissertation
    Full Text:
    catastrophe AN ABSTRACT OF THE THESIS OF Abd Y. Lafi for the degree of Doctor of Philosophy in Nuclear

  • A study of opposing mixed convection in the GRTS and in downward pipe flows using the FLUENT CFD code

    Creator:
    Jackson, R. Brian
    Abstract:
    Downward flow opposing mixed convection conditions have been studied using the FLUENT CFD code. This work was comprised of two primary objectives. The first was to study core channel flow reversal susceptibility in the Gas Reactor Test Section (GRTS) at low flow conditions. The second objective was the development of...
    Resource Type:
    Masters Thesis
    Full Text:
    Jackson for the degree of Master of Science in Nuclear Engineering presented on March 17, 2008

  • Flow Dynamics and Condensation of Film Flows in Small Modular Reactors

    Creator:
    Lee, Dongyoung
    Abstract:
    There is renewed interest in the reliability and safety of nuclear power plants following the Fukushima Daiichi nuclear accident followed by 8.9 magnitude earthquake and Tsunami with the height of 15 m on March 11, 2011. Small Modular Reactors (SMRs) have been developed to improve safety systems by utilizing passive...
    Resource Type:
    Dissertation
    Full Text:
    Small Light Water Reactor NRC Nuclear Regulatory Commission ODE Ordinary Differential Equation OSU

  • Modification of Lower Plenum Structure for Mixing Promotion during Normal Operation of the High Temperature Gas Cooled Reactor

    Creator:
    Gradecka, Malwina
    Abstract:
    Since High Temperature Gas-cooled Reactors are being considered as most promising design of upcoming IV Gen reactors, thus key research areas were identified to address safety aspects of this design. Number of simulations and experiments need to be conducted in this field. In this study thermal-hydraulics aspects of coolant flow...
    Resource Type:
    Dissertation
    Full Text:
    LP – Lower Plenum MHTGR – Modular High Temperature Gas-cooled Reactor NRC – Nuclear Regulatory

  • Comparative analysis of the Žukauskas method and data from the OSU MASLWR test facility steam generator

    Creator:
    Wuth, Bradyn J.
    Abstract:
    Some of the next generation of small modular reactors have been designed with helically coiled steam generators integrated into the reactor vessel to enhance natural circulation. According to the developers of TASS/SMR, a one-dimensional thermal hydraulic code written to model the Korean Atomic Energy Research Institute's SMART reactor, the Žukauskas...
    Resource Type:
    Masters Thesis
    Full Text:
    - signing Small Modular Reactors (SMRs). SMRs are a new genre of nuclear reactor design that are typically

  • Thermal hydraulic analysis of the Oregon State TRIGA Reactor using RELAP5-3D

    Creator:
    Marcum, Wade R.
    Abstract:
    Oregon State University has recently conducted a complete core conversion analysis as part of the Reduced Enrichment for Research and Test Reactors Pprogram. The goals of the thermal hydraulic analyses were to calculate natural circulation flow rates, coolant temperatures and fuel temperatures as a function of core power for both...
    Resource Type:
    Masters Thesis
    Full Text:
    Wade R. Marcum for the degree of Master of Science in Nuclear Engineering presented on January 23

  • A thermal hydraulics analysis of a molybdenum production element for implementation in TRIGA reactors

    Creator:
    Byfield, Patrick
    Abstract:
    The metastable isotope of technetium-99 (Tc-99m) is an important diagnostic tool used in the field of nuclear medicine due to the isotope's 6.0 hour half-life, 140.5 keV γ-decay mechanism, and multiple oxidation states [1,2]. Approximately 70% of the world’s nuclear medicine procedures involve the use of Tc-99m [3]. The conventional...
    Resource Type:
    Masters Thesis
    Full Text:
    ], the UC Davis McClellan Nuclear Radiation Center (MNRC) TRIGA® reactor [25], the Reattore Casaccia-1