[The TRIGA - Mark II Nuclear Research Reactor: history and peculiarities].

SUMMARY Less than five years after the "Atoms for Peace" speech by US President Dwight D. Eisenhower to the United Nations General Assembly in December 1953, TRIGA® (acronym for Training, Research, Isotopes, General Atomics), a new inherently safe type reactor developed for nuclear research, training and isotope production, was conceived, built and operated at the General Atomic Division in San Diego. Over the years, the TRIGA industry has soon evolved into the most widely used research reactor in the world with operating power levels up to 14 MW and designs up to 25 MW. Since 1965 the Laboratory of Applied Nuclear Energy (LENA) of the University of Pavia has been operating a TRIGA research reactor with thermal power levels of 250 kW. The installation is used to support education and training programs, neutron activation analysis activities, medical research, industrial applications, and is mainly dedicated to applied nuclear science in general. These activities will be presented together with the historical and technical aspects of the Nuclear Research Reactor.