Research on the refined calculation of released effluent source term from the reactor building in PWR nuclear power plants

Abstract

The paper takes radionuclide in the reactor building of PWR under normal condition as the research object, a set of nuclide balance equations is established through analyzing the production and disappearance terms of radionuclide in the reactor building. According to the intermittent operation of small sweep gas and introduction of the decay chain, both periodic iteration method and transmutation trajectory analysis method (TTA) are employed to solve for the quantity of radioactive nuclides in the reactor building. Building a virtual nuclear power plant as an example, the radioactive source terms released to the environment from the reactor building is analyzed based on the discharge pathways from the reactor building.