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An Alternative SCWR Design Based on Vertical Power Channels and Hexagonal Fuel Assemblies

An Alternative SCWR Design Based on Vertical Power Channels and Hexagonal Fuel Assemblies. Jacopo Buongiorno. April 29, 2003 Madison, Wisconsin. Concept Description. Moderation is provided by the feedwater flowing downward in the inter-assembly gap. Concept Description (2).

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An Alternative SCWR Design Based on Vertical Power Channels and Hexagonal Fuel Assemblies

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  1. An Alternative SCWR Design Based on Vertical Power Channels and Hexagonal Fuel Assemblies Jacopo Buongiorno April 29, 2003 Madison, Wisconsin

  2. Concept Description Moderation is provided by the feedwater flowing downward in the inter-assembly gap

  3. Concept Description (2)

  4. Concept Evaluation • Advantages • Simple mechanical design of the fuel assembly with no water rods. Wire wrapping can be used as spacer. • The amount of vessel internals above the core is minimal, which should simplify refueling operation. • A favorable neutron economy due to the use of the zirconium-based alloy for the power channels. • Specific Challenges • High local peaking due to the distance of the inner fuel rods from the moderator in the inter-power-channel gap. • The moderator temperature rises roughly 58ºC, therefore the RPV lower head operates at higher temperature than the rest of the vessel. • A durable insulation material for the power channels needs to be selected/developed.

  5. Thermal-Hydraulics Temperature and density distributions in the nominal channel appear acceptable

  6. Neutronics (1) The MCNP model BOL analysis

  7. Neutronics (2) Average spectrum Thermal tail in the fuel rods

  8. Neutronics (3) Doppler and coolant reactivity coefficients similar to LWR’s.

  9. Neutronics (5) Local peaking Power skewing Axial peaking (1.4 with uniform enrichment)

  10. Conclusions • A new SCWR concept with no water rods is introduced. • Moderation is provided by the feedwater in the inter-assembly gap. • The fuel assembly design is simple with hexagonal lattice and zircaloy ducting. • The power density is much higher than for the water rod design. • The estimated fuel-cycle cost is comparable with that of the PWR; the temperature and power distributions seem acceptable; the Doppler and coolant reactivity feedbacks are both negative and within LWR range.

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