X.M. Zhang

Code Development and Target Station Design for Chinese Accelerator-Driven System Project

Abstract The Institute of Modern Physics, Chinese Academy of Sciences performs research and development on the target station of an accelerator-driven system (ADS) under the China ADS project. A newly developed Monte Carlo program for the design of the target station named GMT1.0 is presented. The program is designed for a massively parallelized simulation of the initiative granular-flow target concept. Based on the combination of the Intranuclear Cascade of Leige (INCL) model and the ABLA evaporation/fission model, GMT1.0 integrates a particle transport code and a nuclear reaction code to simulate a spallation target. For validation, a series of calculations of neutronics characteristics and heat-deposit distributions of solid targets were performed, and a high degree of accuracy was shown for GMT1.0. Using GMT1.0, a systematic study of the neutron economy of the target was performed and the neutronics characteristics of the most optimal parameters were illustrated well.

Monte Carlo Burn-Up Code System MCADS and its Application

A Monte Carlo burn-up code system, MCADS, which combines the Monte Carlo code MCNP and the depletion code LITAC, was developed for evaluation the capabilities of fuel burn-up in reactors. The code can be extremely useful for analysts who perform isotope production, material transformation, and depletion and isotope analyses on complex, non-lattice geometries, and uniform and non-uniform lattices. Three well-documented benchmarking problems including IAEA-ADS, OECD/NEA-PWR and fast reactor were used to validate MCADS. The discrepancy between the MCADS calculation and other codes fell into a reasonable range.Copyright

Investigating on Radioactivity of LBE and Pb in ADS Spallation Target

Using the Fluka Monte Carlo method, we argue the activity of lead-bismuth eutectic (LBE) and lead (Pb) spallation targets in Accelerator Driven Subcritical System (ADS). Results reveal that the radioactivity of Pb target is lower than that of LBE target when they have the same beam energy and target diameter, the accumulation activity of two target is enhanced as the increase of proton energy and target diameter. In addition, we also discuss the respective contribution of prominent radionuclides of LBE target under various cooling time, it is specified that the used LBE target can be seen as a permanent radioactive waste. For the present works, we expect that it can offer some valuable hints for the future experiment and the assessment of safety hazards of nuclear facilities.