Analysis of the radiation source activity and intensity of gamma rays at 1000 MWe PWR reactor core

One of the 1000 MWe class nuclear power plant is the AP1000, full operating power reactors by 3,400 MWt. Gamma rays in the reactor core derived from three types of sources :1) gamma ray results of radiative capture reactions,2) gamma rays result of spontaneous fission reaction and 3) gamma ray decay of radionuclides and the decay of the fission radionuclides results from material activation in the core. Nuclides composition in the core is a parameter to determine the radiative capture reaction rate, calculated using the Origen-2 program package. The code was also used to calculate the activity of radionuclides in the reactor core and gamma ray intensity decay. with the assumption that the reactor operated at full power for 540 days without trouble, most of the activity of radionuclide fission results tend to be stable, whereas the activity of radionuclide activity and the activity of actinide material tends to increase with time of operation. The highest activity is the radionuclide activity of the fission product which totals 6.8×109 curies at the end of reactor operation, followed by the activity of actinide 1.06×109 curies, then the result of activation of radionuclide activity 5.98×106 curies. Gamma ray energy ranges between 0-11 MeV, grouped in 7 classes of energy. Radiative capture gamma ray sources contributing the highest intensity followed by the intensity of gamma rays result of spontaneous fission, then the intensity of the decay gamma rays. In general, low-energy gamma rays classes have a greater intensity than the intensity of high energy gamma rays. (author)