Challenges and progress of uncertainty analysis for the pebble-bed high-temperature gas-cooled reactor

Guo, Jiong; Wang, Yizhen; Han, Zhang; Cui, Menglei; Fu, Li

doi:10.1016/j.pnucene.2021.103827

Cited by 5 publications

(1 citation statement)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The actual pebble-bed reactor can be uncertain in may parameters, such as the diameter of pebbles or mass of uranium in each pebble. Uncertainty of these parameters will result in the uncertainty of reactor physics or thermal property (Guo et al, 2021). However, for a computer simulation model, most of these parameters are completely certain, which means the uncertainty of the model results from only a few factors.…”

Section: Factors Causing Uncertaintymentioning

confidence: 99%

High-Fidelity MC-DEM Modeling and Uncertainty Analysis of HTR-PM First Criticality

Liu

Feng

et al. 2022

Front. Energy Res.

View full text Add to dashboard Cite

A high-fidelity model for the first criticality of pebble-bed reactor HTR-PM is built using Monte Carlo (MC) code RMC and discrete element method (DEM) code LAMMPS. Randomly packed TRi-structural ISOtropic (TRISO) particles and fuel pebbles are modeled explicitly. A cone structure on the top of the pebble bed is also taken into account. Criticality calculation result agrees well with the experiment. Uncertainty analysis is carried out considering three inherent aspects: the randomness of MC code, the randomness of TRISO particle and pebble position, and the randomness of mixed pebbles. Results show that these factors have a significant impact on the uncertainty of effective multiplication factor (keff). And the most influential factor is expected to be the randomness of mixed pebbles. The influence of several configuration factors is studied as well. It is observed that the effects of cross-section library, the heterogeneity of TRISO particles, and the angle of pebble bed cone are nonnegligible contributors. However, the results between randomly and regularly placed TRISO particles are not noticeably different.

show abstract

Section: Factors Causing Uncertaintymentioning

confidence: 99%