Large amounts of concrete waste are likely to arise from the decommissioning of a Kori-1 nuclear power plant. Several studies have been conducted on decommissioning concrete waste in recent decades, however, they have been limited to contaminated concrete issues or were small pilot-scale experiments. This study constructed two industrial-scale models of on-site concrete waste management for clean as well as contaminated concrete. To evaluate the performance of both the models, simulations were conducted using the Flexsim software. The concrete particle size distribution of Kori-1 and concrete processor properties based on widely used construction equipment were used as sources of input data for the simulations. It was observed that it may take over two years to complete the on-site concrete management processes owing to the performance of existing processors. In addition, it was demonstrated that it is essential to identify bottlenecks in the system and enhance the performance of the relevant processors to avoid delays of the decommissioning schedule. Our results suggest that this novel approach can contribute to developing schedules or expediting delayed activities in the Kori-1 decommissioning project.

1. Introduction
2. Literature review
    2.1 Reference project
    2.2 Characteristics of concrete
    2.3 Decommissioning concrete waste
    2.4 Radionuclides removal practices
    2.5 Disposal of concrete waste
    2.6 Concept of simulation
3. Application of technology
    3.1 Selection of technology
    3.2 Contaminated concrete separation process
    3.3 Clean concrete release process
    3.4 Other considerations
4. Simulation
    4.1 Model type
    4.2 Input data
    4.3 Set values for processors
    4.4 Assumptions
    4.5 Simulation model
5. Results
    5.1 Contaminated concrete separation process
    5.2 Clean concrete release process
6. Conclusion
REFERENCES