Development And Test Of Fine Group Nuclear Database For Advanced Nuclear Systems

Research and Development of advanced nuclear systems, such as Accelerator-Driven Subcritical system and Fusion-Driven Subcritical systems, is one of the most important research fields for their privilege of proliferation of nuclear fuel, transmutation of nuclear waste and high safety etc. Accurate and reliable nuclear database is the fundamental of the modeling and simulation of advanced nuclear system. Multi-group nuclear database for deterministic method is needed because of its advantage of high convergence speed and fitness for spatial distribution calculation. However, the design of an advanced nuclear system may need to do a lot of iterative designs during the research and development process, so the generation of a general purpose multi-group library is very necessary. Database with thousands or ten-thousands of energy group is called fine group or fine group library, and it is stated that this kind of group structure can reduce the restriction of weighting function adopted, so it would be more versatile. Coarse groups collapsed from fine groups can save the time to develop a new multi-group library, so it has great significance to design an fine nuclear database.This thesis investigated the related physical features and big spectrum span of the advanced nuclear system, and developed a1200group fine nuclear database with upper energy to150MeV for neutron. And it included the correction of Doppler effect, resonance effect and thermal up-scatter effect. The methods of Bondarenko and Flux Calculator were used in the correction of resonance effects. Moreover, TRANSX was used to collapse fine group to coarse group.Accuracy and reliability of nuclear database should be tested by benchmarks. The cross section for heavy nucleus and light nucleus was tested by experimental results from "International Handbook of Evaluated Criticality Benchmark Experiments" and "Shielding Integral Benchmark Archive Database". High energy region of the nuclear database was tested with the high energy neutron shielding experiment in Japan. Finally, the fine group was tested using the IAEA-ADS model, compared with continuous energy neutron cross section library. The test results validated the reliability of the fine nuclear database. Similar tests for the collapsing system further validated the reliability of the collapsing system..This fine nuclear database could be used in shielding optimization calculation, multi-objective optimization calculation and burn-up management calculation. It would probably improve the efficiency of the physical design of advanced nuclear systems.