Abstract: Nuclear beta and double beta-decay experiments are intensively used for exploring the space of neutrino parameters. In this talk, we will see how these experiments can throw light not only on the active neutrino sector, but also to the sterile neutrino sector. In the first part of the talk, we will revisit the potential of single beta-decay experiments to search for keV sterile neutrinos, highlighting its complementarity with neutrinoless double beta-decay  searches. In the second part, we will…