[en] JNC (Japan Nuclear Cycle Development Institute) has been promoting the fellowship program for young scientists to encourage their expertise from 1997. The objective of this program is to raise the talented persons for future JNC activities. This report summarized the status on the 17 themes of researches implemented by young research fellows in 1999. The report includes the list of individual titles and the site and supporting staffs of JNC. The individual reports given by 17 authors describe its time schedule, status, achievements and own publications in the prearranged format. Topics include the followings; Those are giant resonance structures of short lifetime nuclei, growth of cavities in structural materials, calculation methods of photonuclear interaction cross-section, stability and radioactivity diffusion of bentonite, plant ecology of radioactivity in uranium mines, numerical simulations on the TRUEX process, advanced nondestructive testing of materials, physical properties of actinides obtained by band theory, de-oxidisation capability in pyrite to decrease oxygen in bentonite, investigation on equilibrium fast reactor recycling, behaviors of underground water in the Tono Mine, effects of radiation induced educts on swelling, simulation on fuel-coolant interaction after severe accidents, and resonance ionization mass spectrometry for the JOYO reactor to detect failed fuel locations. (Tanaka, Y.)