We study the effect of electronic interactions on the addition spectra and
on the energy-level distributions of two-dimensional quantum dots with weak
disorder using the self-consistent Hartree-Fock approximation for spinless
electrons. We show that the distribution of the conductance peak spacings
is Gaussian with large fluctuations that exceed, in agreement with experime
nts, the mean level spacing of the noninteracting system. We analyze this d
istribution on the basis of Koopmans' theorem. We show furthermore that the
occupied and unoccupied Hartree-Fock levels exhibit Wigner-Dyson statistic
s. [S0163-1829(99)09427-8].