  Heavy neutrinos from the Type-I Seesaw model can have a large mixing with
active states, motivating their search at collider experiments. However, loop
corrections to light neutrino masses constrain the heavy neutrinos to appear in
pseudo-Dirac pairs, leading to a potential suppression of lepton number
violating parameters.
  In this work we perform a detailed review of a proposal to relax constraints
on lepton number violation by adding supersymmetry. We define the conditions
necessary to maximise the SUSY screening effect, with the objective of allowing
a larger mass splitting between low-scale heavy neutrino masses. We find that
the sole addition of SUSY does not guarantee a screening, and that favourable
cases have some degree of fine-tuning.
