  Very recently a novel implementation of type-II seesaw mechanism for neutrino
mass has been proposed in SU(5) grand unified theory with a number of desirable
new physical phenomena beyond the standard model.Introducing heavy right-haded
neutrinos and extra fermion singlets, in this work we show how the type-I seeaw
cancellation mechanism works in this SU(5) framework. Besides predicting
verifiable LFV decays, we further show that the model predicts dominant double
beta decay with normal hierarchy or inverted hierarchy of active light neutrino
masses in concordance with cosmological bound. In addition, a novel mechanism
for heavy right-handed neutrino mass generation independent of type-II seesaw
predicted mass hierarchy, is suggested in this work.
