  Plasmoid-mediated reconnection is investigated for nonlinear
Peeling-Ballooning Edge-Localized Modes (P-B ELMs). The formation of current
sheets and the transition to 3-D current sheet instability is demonstrated
through fully nonlinear resistive MHD simulations of P-B ELMs in DIII- D
discharges. Large-scale axisymmetric current sheets, as well as small-scale
poloidally extending current sheets, are formed as the coherent P-B ELM
filaments nonlinearly evolve. It is observed that, at high Lundquist numbers,
these current sheets break during a reconnection burst, i.e. a secondary
exponential growth of intermediate modes followed by relaxation due to the
suppression of P-B drive.
