Session: 04-02 Geologic Repository & Performance

Paper Number: 110280

110280 - A Study on Korean Deep Geological Repository for High-Level Radioactive Waste: (2) Use of Goldsim for Risk Assessment 

The beginning of safety study should be to check the compliance with regulatory requirements, and its implementation usually necessitates methodologies and tools. Risk, which is a quantitative representation for the degree of health risk caused by radiation exposure from disposed radioactive waste, is a main indicator for the safety of High-Level radioactive Waste(HLW) in Korean regulation, and it should be calculated by an appropriate methodology, which is not yet setup. As mentioned in the first series of this companion paper, risk assessment is progressed through the development of FEP and scenarios, and their interactive calculation, and a tool is required to follow up the process for the safety assessment of HLW.

GoldSim is a program for dynamic and probabilistic simulations, and its general purpose is to combine an extension of system dynamics with some aspects of discrete event simulation. As GoldSim is initially made to be versatile in all material transportation, various submodules were prepared separately so that simulation programs suitable for a specific field could be used in combination of main module and these submodules. Among the submodules included in GoldSim, Transport Module, which simulates nuclide transportation from repository to biosphere, is utilized to demonstrate the validity of the risk assessment.

Following the previous companion paper, which gives the overall description of the safety assessment, this paper shows the overall algorithm for risk assessment, system modelling for simulation, and an actual example of scenario simulation with GoldSim. Since modelling the system is the most essential task for utilizing GoldSim, it should be carried out in detail according to three areas, Near-field, Far-field, and Biosphere, and the description for these detailed areas are also given. The method to create a risk profile is also explained.

Presenting Author: Karyoung Choi KyungHee University

Presenting Author Biography: KaRyoung Choi is currently affiliated in KyungHee University and going to master's degree at 2023. There are no deep-geological repositories at Korea, and she is under a project for building repository sites in Korea. Nuclide release scenarios should be made for safety assessment of the High-Level Waste(HLW) repositories, and to develop the scenarios, Feature, Event, and Process(FEP) should be defined first. Defining FEPs is the main study for her.