  Modelisations of galactic 1.275 MeV emission produced by the decay 22Na have
been performed for several frequency-spatial distributions of ONe novae. Recent
results of nova rates and their distributions in our Galaxy have been used.
These modelisations allow to estimate the lower-limit of the 22Na mass ejected
per ONe novae detectable with the future spectrometer (SPI) of the INTEGRAL
observatory as a function of their frequency-spatial distribution in the
Galaxy. Calculations using recent estimations of the expected 22Na mass ejected
per ONe nova show that the diffuse galactic 1.275 MeV emission will be
difficult to detect with SPI.
