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We present the first measurements of tritium beta-decay spectrum in theelectron energy range 16-18.6 keV. The goal is to find distortions which maycorrespond to the presence of a heavy sterile neutrinos. A possiblecontribution of this kind would manifest itself as a kink in the spectrum witha similar shape but with end point shifted by the value of a heavy neutrinomass. We set a new upper limits to the neutrino mixing matrix element U^2_{e4}which improve existing limits by a factor from 2 to 5 in the mass range 0.1-2keV.

First measeurements in search for keV-sterile neutrino in tritium beta-decay by Troitsk nu-mass experiment