Reactor safety

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Advanced Passive System Development

Objectives

  • Validation of the heat removal requirement and improvement of the heat exchanger design of passive containment cooling system (PCCS)
  • Validation of operational and cooling performances of the APR+ PAFS (Passive Auxiliary Feedwater System)
  • Development of an air-water passive combined cooling system (APCCS) and validation of cooling performance

R&D Status

  • Validation test program for the iPOWER PCCS is under progress and it will be completed in 2019.
  • Single tube test: Validation of heat removal requirement of the prototype heat exchanger of PCCS
  • Bundle tube test: Investigation of bundle shadowing and suction effects
  • Fin tube test: Optimization of the fin tube design to improve the heat removal capacity of the heat exchanger
  • Validation of operational and cooling performances of the APR+ PAFS
  • APR+ PFAS test facility: full height and 1/16 volume scale with steam generator of 10 MW
  • Scientific design of the 1/16 scale test facility in 2017
  • Construction of the 1/16 scale test facility in 2018
  • Commissioning and main tests in 2019
  • Development of an air-water passive combined cooling system (APCCS) and validation of cooling performance
  • Basic concept of fin-tube air cooling system
  • Performance analysis for fin tube assembly by CFD and MARS codes
  • Heat transfer test for horizontal single fin-tube
  • Heat transfer test for horizontal fin-tube assembly
  • Heat transfer test for electrically heated horizontal fin-tube assembly
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Safety systems of the iPOWER

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Validation test facility for PCCS

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Test facility for APCCS

Outcomes & Perspectives

  • Validation test results will be used for supporting the licensing process of the iPOWER PCCS
  • Confirmation of heat removal requirement of the current design of PCCS heat exchanger
  • Contribution to design improvement of PCCS heat exchanger with an aim of enhancing the heat removal capacity
  • Development of mechanistic condensation heat transfer model for safety analysis of PCCS
  • Validation of operational and cooling performances of the APR+ PAFS
  • Large scale experimental data for the assessment of the heat removal performance of the PAFS
  • Validation of the operational and cooling performance of the PAFS
  • Validation test results will be used for evaluation of the CFD and MARS analysis models
  • Heat structure surface area multiplier of MARS model
  • Flow resistance coefficient of MARS model
  • Fouling factor of fin-tube bundle for MARS model
  • Buoyancy driven air-velocity of fin-tube bundle
  • Validation of CFD results, etc.

Innovative Reactor and Safety Feature Development

Objectives

  • Validation of the boron mixing and mixing factor at the core flow channel of APR+
  • Validation of Hybrid Safety Injection Tank performances of the APR+
  • High Pressure Steam Condensation Performance Test for Hybrid Safety Injection Tank

R&D Status

  • Validation tests of the boron mixing and mixing factor at the core flow channel of APR+
  • Pretest CFD analysis for test facility design
  • Visualization of boron flow mixing behaviors
  • Conceptual design of the 1/5-scale test facility in 2017
  • Construction of the 1/5-scale test facility in 2018
  • Commissioning and pressure pulsation test in 2018
  • Boron flow mixing test in 2019
  • Mixing factor test in 2019
  • Integral Effect Test of Hybrid SIT by using ATLAS Facility

Outcomes & Perspectives

  • Validation tests for APR+
  • Validation test results will be used for evaluation of the user factor for KEPCO-E&C’s safety analysis model
  • Validation of the boron perfect mixing model for CVCS and SCS working condition
  • Validation of the cross flow mixing factor
  • Validation of the pressure pulsation at the reactor system loop
  • Validation tests for H-SIT
  • H-SIT Separate Effect Test : Identification of overall thermal-hydraulic phenomena of the H-SIT (steam condensation, thermal mixing and coolant thermal stratification)
  • H-SIT Integral Effect Test : Design performance test for SBO or SBLOCA condition of APR+ by using the ATLAS facility, integral effect test matrix is listed in Table
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Concept of Hybrid SIT