http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Azamat Khassenov Graduate School of UNIST 2018 국내석사
This thesis presents the generation and application results of the windowed multipole (WMP) library in UNIST in-house Monte Carlo code (MCS). The given library is used in the on-the-fly Doppler broadening of microscopic cross section at the temperature of the interest during a Monte Carlo simulation. This feature is one of the major requirements for multi-physics simulations; in other words, coupled calculations of neutron transport, thermal-hydraulics, and fuel performance codes. A windowed multipole library significantly reduces the memory necessary for cross section storage with a reasonable increase in the total Monte Carlo simulation time. The ENDF/B-VII.1 neutron induced library contains information on 430 isotopes, where 331 contain resonance parameters for the resolved resonance region. In the first step, the parameters from the evaluated nuclear data file were converted into corresponding rigorous multipole parameters, which can be directly used in temperature dependent cross section reconstruction. Further, in order to reduce the cross section generation time the energy window concept was applied with an accuracy threshold of 0.1 % relative difference in comparison to the reference cross section. The accuracy and effect of the generated windowed multipole library on the MCS simulation was evaluated using fresh and burned PWR fuel pins, and assemblies.