High-Fidelity Light Water Reactor Analysis with the Numerical Nuclear Reactor

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Weber, David P.; Joo, Han Gyu

Issue Date
American Nuclear Society
Nucl. Sci. Eng., 155, 395 (2007)
Numerical Nuclear ReactorDeCARTHigh-FidelitySimulation
The Numerical Nuclear Reactor (NNR) was developed to provide a high-fidelity tool for light
water reactor analysis based on first-principles models. High fidelity is accomplished by integrating full
physics, highly refined solution modules for the coupled neutronic and thermal-hydraulic phenomena.
Each solution module employs methods and models that are formulated faithfully to the first principles
governing the physics, real geometry, and constituents. Specifically, the critical analysis elements that are
incorporated in the coupled code capability are a direct whole-core neutron transport solution and an
ultra-fine-mesh computational fluid dynamics / heat transfer solution, each obtained with explicit (subfuel-
pin-cell level) heterogeneous representations of the components of the core. The considerable computational
resources required for such highly refined modeling are addressed by using massively parallel
computers, which together with the coupled codes constitute the NNR. To establish confidence in the NNR
methodology, verification and validation of the solution modules have been performed and are continuing
for both the neutronic module and the thermal-hydraulic module for single-phase and two-phase boiling
conditions under prototypical pressurized water reactor and boiling water reactor conditions. This paper
describes the features of the NNR and validation of each module and provides the results of several
coupled code calculations.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Nuclear Engineering (원자핵공학전공)Journal Papers (저널논문_원자핵공학과)
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