CRUDTRAN을 이용한 국내원전의 부식생성물 거동 예측 및 메커니즘 연구

Abstract

Radionuclide deposited on the surface of several internal and external systems in a nuclear power plant is created by the activation of corrosion products of nuclear reactor structural materials and fission products. Especially, the constant contact between water and the surface corroded inside the primary system makes coolants and corrosion products mixed and circulate along the systems. At this point, some of the corrosion products exist in a molten state, while other corrosion products are not melted, while creating particle materials called ‘CRUD’. Corrosion products created inside the primary system are activated by neutron irradiation while circulating around the nuclear reactor, and they are mainly composed of Nickel-ferrites (NixFe3-xO4), but their fixing amount and distribution vary depending on the form, size, structural frame and material. Thus, based on a mathematical modeling-based calculation method, these factors can be used for the radioactive inventory evaluation technique needed when a nuclear power plant should be dismantled, which is also expected to have direct effect on choosing a dismantlement method. Particularly, after selecting a specific cycle by collecting HWC data and primary system-related data from Gori NPP Unit 1 and comparatively analyzing the movement of radionuclide and corrosion products created inside the primary system by using the CRUDTRAN code, this study aims to increase the reliability of these result values by comparing the analyzed and calculated values with the actual data of a Westing House-type nuclear power plant.