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RELAP5 Analyses of a Deep Burn High Temperature Reactor Core

RELAP5 Analyses of a Deep Burn High Temperature Reactor Core. Hongbin Zhang*, Michael Pope, Haihua Zhao Idaho National Laboratory *Email: Hongbin.Zhang@inl.gov 2010 RELAP5 International Users Seminar September 20-23, 2010, West Yellowstone, Montana

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RELAP5 Analyses of a Deep Burn High Temperature Reactor Core

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  1. RELAP5 Analyses of a Deep Burn High Temperature Reactor Core Hongbin Zhang*, Michael Pope, Haihua Zhao Idaho National Laboratory *Email: Hongbin.Zhang@inl.gov 2010 RELAP5 International Users Seminar September 20-23, 2010, West Yellowstone, Montana Acknowledgement: Authors are grateful for Paul Bayless’s help to set up the RELAP5 input deck.

  2. Prismatic Deep Burn Concept Compacts TRU kernel TRU TRISO Burn-up to 750 GWD/MT is feasible LWR used fuel Deep Burn Core Fuel Elements

  3. Fuel Composition Packing fraction of TRISO particles is 18%. Fuel kernel diameter is 200 um. TRU fuel representative of PWR spent fuel after 5 years of cooling.

  4. 2D Lattice Calculations • DRAGON – collision probability transport code developed by Institut de Génie Nucléaire, École Polytechnique de Montréal, Montréal. 172 energy groups for various temperature and burnups. • 23 group homogenized cross sections generated for DIF3D. • Reflector: 1-D model of the core with a representative fuel region and a reflector zone. Schematic of 1/12 fuel block model used in DRAGON

  5. Full Core Calculations • DIF3D/REBUS • Axial Shuffle Only

  6. Equilibrium Cycle Equilibrium cycle is reached after 12 cycles Cycle length – 300 days Batch-average discharge 64% FIMA, or 600 MWD/t.

  7. Decay Heat Curve Decay heat curve is from calculations by Professor Kostadin Ivanov at Penn State

  8. RELAP5 Model • Model started from the NGNP Point Design, INEEL/EXT-03-00870 Rev. 1 • Core, vessel, reactor cavity and RCCS considered • Core – seven parallel coolant channels • 1-D radial conduction with conduction enclosure to simulate axial direction heat conduction.

  9. RELAP5 Nodalization Reactor vessel, cavity and RCCS nodalization

  10. RELAP5 Steady State Results • Reactor Power: 600 MWth. • Reactor Inlet Temperature: 491°C. • Reactor Outlet Temperature: 850°C. • Core Flow Rate: 324 KG/S • Bypass Flow Fraction: 12%

  11. Low Pressure Conduction Cooldown Results

  12. High Pressure Conduction Cooldown Results

  13. Summary • LPCC (depressurized loss of forced cooling) transients showed fuel temperatures exceed 1600oC • However, very conservative consumptions went into the RELAP5 calculations • Burnable poisons and power flattening measures were not considered • Very conservative decay heat curve was used • Ongoing promising work by other researchers to use burnable poisons and better fuel shuffling scheme to lower fuel temperature.

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