Graphical Environmental Pathway Analysis Software TEDII-60 Incorporating ICRP-60 Recommendations

Abstract

Korean nuclear regulation recently adopted into the law the dose limits and concepts of ICRP-60. The public dose limits applied to the design of nuclear facilities are implemented using the dosimetric system provided in ICRP-60. Therefore, a new offsite dose assessment computer code was developed to prepare the Safety Analysis Reports and Environmental Reports for all new NPPs as well as plants currently operating. KOPEC (Korea Power Engineering Co, Inc), which is the sole NPP designer in Korea, has developed a new computer code, named TEDII-60 (Totally Visualized Environmental Dose Assessment Code System Incorporating ICRP-60 Recommendations) which ensures compliance with ICRP-60 recommendations. It encompasses all the related processes for the offsite dose analysis such as meteorological raw data processing, atmospheric and oceanographic dispersion analysis, and design phase expected annual effluent release rate analysis using perfect graphic 1/0 display. Pathway analyses are conducted for a maximum of 27 tissues or organs of 6 age groups for both maximally exposed individual and the population within 80km of the site. This code uses dose coefficients from recent ICRP publications and USEPA reports which include nearly 800 radionuclides. TEDII-60 can assess doses from all the chemical forms and particle sizes from the 0.001~10 :m AMAD of any nuclide. This code has been verified by the Korean regulatory body and academic institutes and compared with formerly released programs. TEDII-60 will soon be used to perform dose assessment of new Korean NPPs and operating plants once additional administrative procedures are completed.