Measurements of the isothermal, power and temperature reactivity coefficients of the IPR-R1 TRIGA reactor

►Experiments were done in the TRIGA reactor at CDTN/CNEN in Brazil. ►It was found that isothermal reactivity coefficient is negative. ►It was found the power and the temperature reactivity coefficients. ►Coolant temperature contributed with small fraction to negative reactivity effect. ►Then the fuel power coefficient of reactivity is the main contributor of it.