Consideration of ALARA Principle in Design of Steam Generator

The principle of ALARA（As Low as Reasonably Achievable） is one of the basic considerations in radiation protection. As one of the most important primary equipment, during the design of steam generators, the principle of ALARA shall be considered to limit or reduce the radiation exposure of plant personnel. Through analyzing the design process which might affect the irradiation dose, it is concluded that SG will further fulfill the ALARA principle if measures are taken to optimize the material used, to drain the primary coolant completely and quickly, to improve the in-service methods, to strengthen radiation shielding and to optimizing the water chemistry. Based on the conclusions, some improvements are proposed to make the SG of Generation 2⁺ more complied with the ALARA principle.