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Mechanical robustness of AREVA NP's GAIA fuel design under seismic and LOCA excitations
Brian Painter,Brett Matthews,Pierre-Henri Louf,Herve Lebail,Veit Marx 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.2
Recent events in the nuclear industry have resulted in a movement towards increased seismic and LOCAexcitations and requirements that challenge current fuel designs. AREVA NP's GAIA fuel design introducesunique and robust characteristics to resist the effects of seismic and LOCA excitations. For demanding seismic and LOCA scenarios, fuel assembly spacer grids can undergo plastic deformations. These plastic deformations must not prohibit the complete insertion of the control rod assembliesand the cooling of the fuel rods after the accident. The specific structure of the GAIA spacer gridproduces a unique and stable compressive deformation mode which maintains the regular array of thefuel rods and guide tubes. The stability of the spacer grid allows it to absorb a significant amount ofenergy without a loss of load-carrying capacity. The GAIA-specific grid behavior is in contrast to the typical spacer grid, which is characterized by abuckling instability. The increased mechanical robustness of the GAIA spacer grid is advantageous inmeeting the increased seismic and LOCA loadings and the associated safety requirements. The uniqueGAIA spacer grid behavior will be incorporated into AREVA NP's licensed methodologies to take fullbenefit of the increased mechanical robustness
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