Core TH

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Multi-Field Coupled Rod Bundle Research

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Objectives

  • Experiments and modeling for multi-D flow in rod bundles
  • Improvement of turbulent dispersion model for multi-D single-phase flow in rod bundles based on MIR+PIV technique
  • Production of test DB for code validation on multi-D two-phase flow in a rod bundle based on X-ray CT technique
  • Multi-physics coupled safety assessment of LOCA and RIA phenomena
  • Thermo-mechanically coupled analysis of LOCA (Loss-of-Coolant Accident) and validation of the coupled safety analysis code
  • Experiment and model improvement of transient heat transfer phenomena for RIA (Reactivity Initiated Accident)

R&D Status

  • Preliminary MIR+PIV experiments are being conducted using a 6×4 rod bundle test facility (PRIUS)
  • Test facilities of PWR fuel assembly scale are being designed for single-phase MIR+PIV experiments and for two-phase X-ray CT experiments.
  • Development of experimental techniques and measurement method for multi-physics coupled LOCA analysis
  • Design and construction of RIA test facility and commissioning tests
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Distorted image due to
unmatched refractive index

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Transparent image by
matched refractive index

Raw image without and with MIR tech. (PRIUS)

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Mean velocity and turbulence intensity

Year Research Plan - Multi-physics coupled safety assessment of LOCA and RIA phenomena
2017 Design of experimental facility and development of measurement techniques Installation and commissioning of low-pressure test facility
2018 Construction of experimental facility for single rod test Experiments for pool boiling under low-pressure conditions
2019 Single rod test and evaluation of the integrated fuel and thermal-hydraulics code Experiments for flow boiling under low-pressure conditions
2020 Construction of experimental facility for rod bundle test Installation and commissioning of high-pressure test facility
2021 Rod bundle test and validation of the integrated fuel and thermal-hydraulics code Database construction and T/H modeling for RIA condition

Outcomes & Perspectives

  • Contribution to the advancement of multi-D reactor TH analysis code through securement of unique test DB and model development
  • Contribution to advanced multi-physics safety analysis technique of LOCA and RIA phenomena by using multi-physics coupled analyses and related model improvements
  • Direct application of the research results to verification and validation of multi-physics coupled safety analysis code system
  • Broadening of current safety analysis scope by extending multi-physics coupled LOCA and RIA phenomena to realistic safety analysis of design extension conditions
  • Improvement of prediction capabilities of multi-physics coupled safety analysis code system for LOCA and RIA