Abstract
The field of nuclear materials encompasses numerous opportunities to address and ultimately solve longstanding industrial problems by improving the fundamental understanding of materials through the integration of experiments with multiscale modeling and high-performance simulation. A particularly noteworthy example is an ongoing study of axial power distortions in a nuclear reactor induced by corrosion deposits, known as CRUD (Chalk River unidentified deposits). We describe how progress is being made toward achieving scientific advances and technological solutions on two fronts. Specifically, the study of thermal conductivity of CRUD phases has augmented missing data as well as revealed new mechanisms. Additionally, the development of a multiscale simulation framework shows potential for the validation of a new capability to predict the power distribution of a reactor, in effect direct evidence of technological impact. The material- and system-level challenges identified in the study of CRUD are similar to other well-known vexing problems in nuclear materials, such as irradiation accelerated corrosion, stress corrosion cracking, and void swelling; they all involve connecting materials science fundamentals at the atomistic- and meso-scales to technology challenges at the macroscale.
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Notes
* MPO Advanced Materials/Boron Analyzer—Boron Deposition Model. “MPO” stands for materials performance and optimization, one of the five focus areas established by the Consortium for Advanced Simulation of Light Water Reactors.
† This effective thermal conductivity can be estimated from microscale simulations by treating the CRUD as a homogeneous solid and calculating what its thermal conductivity would have to be based on the temperature difference across it.
‡ CRUD is typically composed of any number of the following phases: nickel metal, NiO, Fe3O4, NiFe2O4 (trevorite), and ZrO2. Boron-lithium compounds that form within its pores include LiBO2, Li2B4O7, B2O3, higher-order polymorphs of Li/B/O compounds, and Ni2FeBO5 (bonaccordite).
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Acknowledgments
The authors acknowledge funding from the Consortium for Advanced Simulation of LWRs (CASL) and laboratory directed research and development (LDRD) funding from the Idaho National Laboratory (INL). Thanks are due to Yaqi Wang and Andrew Slaughter for preparing calculations related to the fullcore simulation. The work would also not have been possible without the insight and technical expertise of Cody Permann, David Andrs, Rich Williamson, Richard Martineau (INL), David Andersson and Brian Kendrick (LANL), Brian Wirth (U. Tennessee), Don Brenner and Chris O’Brien (NCSU), Dennis Hussey (EPRI), and Zeses Karoutas and Jeff Secker (Westinghouse).
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Short, M.P., Gaston, D., Stanek, C.R. et al. A perspective on coupled multiscale simulation and validation in nuclear materials. MRS Bulletin 39, 71–77 (2014). https://doi.org/10.1557/mrs.2013.315
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DOI: https://doi.org/10.1557/mrs.2013.315