Article
Nuclear Science & Technology
Zuo-Yi Zhang, Yu-Jie Dong, Qi Shi, Fu Li, Hai-Tao Wang
Summary: The HTR-PM600 high-temperature gas-cooled reactor nuclear power plant is a nuclear power plant based on the technology of the high-temperature gas-cooled reactor pebble-bed module demonstration project. It utilizes six parallel reactor modules and a steam turbine to form a 600 MWe nuclear power plant. It provides the same level of inherent safety as the HTR-PM and has a similar system configuration, but with a larger containment to accommodate more modules.
NUCLEAR SCIENCE AND TECHNIQUES
(2022)
Article
Materials Science, Multidisciplinary
Wei Xu, Wei Peng, Lei Shi, Qi Sun
Summary: This paper investigates the oxidation and shape evolution of matrix graphite in high temperature gas-cooled reactors during air-ingress accidents. A reaction kinetics model is established and computational fluid dynamics with a dynamic mesh method is used to simulate the oxidation process. The results show that the geometric shape of graphite changes significantly with increasing flow rate, and the graphite pebbles tend to form a structure with a narrow front and wide tail.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Energy & Fuels
Dwi Irwanto, Ayu Lia Pratama
Summary: This study aims to compare and optimize the fissile utilization of different materials in the high-temperature gas-cooled reactor (HTGR), finding that fuel enrichment at 11% and CFP number between 8950 and 11,180 are optimal. Pu-based fuel achieves the highest fuel utilization level, with 81.6% of utilized fissile material at the end of the reactor period.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Qi Wang, Rafael Macian-Juan
Summary: This paper proposes two novel system layouts to improve the thermodynamic performance of the conventional very high temperature gas-cooled reactor (VHTR)-based hydrogen-electricity cogeneration system. The study establishes a thermodynamic model of the entire system and analyzes its performance under benchmark conditions and the effects of key operating parameters.
Article
Chemistry, Physical
Qunxiang Gao, Qi Sun, Ping Zhang, Wei Peng, Songzhe Chen
Summary: This study focused on the key sulfuric acid decomposition reaction in the thermochemical iodine sulfur cycle driven by a high-temperature gas-cooled reactor, and analyzed the effects of different catalyst arrangements on the decomposition fraction. The results provide insights for optimizing catalyst selection based on flow and heat transfer rates.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nuclear Science & Technology
Zhang Youjie, Fang Xiang, Ma Tao, Xia Bing, Li Chuan
Summary: The study investigates the temperature distribution in the HTR core and proposes a technical scheme for online temperature measurement, utilizing temperature monitors that flow along with graphite pebbles to measure and record the core temperature. The proposed technique effectively measures the temperature and distribution in the HTR-10 core, and is verified through practical application.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Chemistry, Physical
Qi Wang, Chunyu Liu, Dantong Li, Rafael Macian-Juan
Summary: This study proposes and investigates two improved nuclear hydrogen and steam and helium gas turbines electricity cogeneration systems based on very high temperature gas-cooled reactors and iodine-sulfur cycle. Energy and exergy analysis methods are used to model the systems and optimize their parameters. The results reveal differences in energy consumption, thermal efficiency, and global efficiency under different operating conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Hang Ni, Wei Peng, Xinhe Qu, Gang Zhao, Ping Zhang, Jie Wang
Summary: This study proposes a polygeneration system coupled with a very high-temperature gas-cooled reactor for the cascading utilization of energy. The system simultaneously outputs hydrogen, electricity, and high-temperature steam. Energy and exergy analyses reveal that the overall energy and exergy efficiencies reach 51.27% and 66.96%, respectively, when the power ratio is 1 and the share of the main steam extracted for heat supply is 0.15.
Article
Materials Science, Multidisciplinary
C. Degueldre, R. J. Wilbraham, J. Fahy, S. M. Green
Summary: The study investigates the secondary recrystallisation and abnormal grain growth behavior in a specific stainless steel alloy pinned by nano-particles under certain stress and annealing conditions. Tests were conducted to examine the effect of grain size distributions and growth models with changes in time and temperature. It is suggested that a more precise analysis of grain and nano-particle sizes is essential for an accurate evaluation of incubation time, along with further research and development work to apply the model and prevent secondary grain growth.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Thermodynamics
Jiuwu Hui, Yi-Kuen Lee, Jingqi Yuan
Summary: This paper proposes an adaptive active fault-tolerant dynamic surface control strategy for the load following problem of a modular high-temperature gas-cooled reactor suffering from lumped uncertainty and actuator faults. A radial basis function neural network is introduced to real-timely learn the lumped uncertainty, and a dynamic surface control technique is employed to cope with the problem of complexity explosion. An active fault-tolerant controller, incorporated with a fault detection observer and a fault estimator, is developed to enhance the reliability and safety of the reactor system.
APPLIED THERMAL ENGINEERING
(2023)
Article
Nuclear Science & Technology
Shuangbao Zhang, Liangxing Li, Zhengzheng Zhang, Shuanglei Zhang
Summary: The study established a three-dimensional coupled model for the core of high temperature gas-cooled reactor and verified it by comparing calculated results with published data, which showed that the model can be used to simulate flow and heat transfer process in the primary circuit effectively. It was found that the model fully considers the influence of convective and radiative heat transfer, making numerical calculations closer to actual condition.
ANNALS OF NUCLEAR ENERGY
(2021)
Article
Nuclear Science & Technology
Luiza Dihoru, Olafur Oddbjornsson, Adam J. Crewe, Colin A. Taylor
Summary: This study focuses on the experimental and numerical predictions to support the safety of AGRs, with a particular emphasis on the core columns and channel shape calculations. The results will contribute to the assessment of the core's dynamic behavior and seismic resilience.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Energy & Fuels
Xinhe Qu, Xiaoyong Yang, Jie Wang
Summary: Due to the serious environmental and climate problems, the energy industry is required to focus on energy utilization rates. High-temperature gas-cooled reactors (HTGRs) coupled with combined cycles show advantages in efficient energy conversion. In this study, the optimization characteristics of the combined cycle coupled with HTGRs are revealed, with two extreme values of combined cycle efficiency for subcritical steam parameters.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Nuclear Science & Technology
Ao Liu, Pengcheng Peng, Jun Zhao, Hongchun Ding, Tao Liu, Jiejuan Tong
Summary: The demand for multi-unit probabilistic risk assessment (MUPRA) has increased with the rise in the number of multi-unit nuclear power plants (NPPs). Conventional probabilistic risk assessment (PRA) for a single unit is insufficient in analyzing overall site risk due to dependencies among multiple units on one site. Existing MUPRA studies have mainly focused on limited risk characteristics or a small number of units. This study proposes a multi-unit event sequence modeling method and a corresponding computer-aided tool that can handle a larger number of units, and demonstrates its applicability to a specific type of reactor.
ANNALS OF NUCLEAR ENERGY
(2023)
Article
Thermodynamics
Zhe Dong, Bowen Li, Xiaojin Huang, Yujie Dong, Zuoyi Zhang
Summary: A passivity-based power-pressure coordinated control method is proposed in this paper and applied to a six-modular high temperature gas-cooled reactor. The simulation results confirm its closed-loop stability and superior performance compared to traditional controllers.
