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Главная Архив Оргкомитет Будущие конференции American Society of Thermal and Fluids Engineering
Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Theoretical study on critical heat flux with non-uniform axial power distribution

Wenxing Liu
RETH, Nuclear Power Institute of China, Chengdu, China

Dawei Zhao
RETH, Nuclear Power Institute of China, Chengdu, China

Yuanfeng Zan
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulic Technology, Nuclear Power Institute of China No. 328 Changshun Avenue, Chengdu, 610213, China

Wanyu Xiong
RETH, Nuclear Power Institute of China, Chengdu, China

Jun Huang
RETH, Nuclear Power Institute of China, Chengdu, China


Critical heat flux (CHF) is a very important limiting parameter used to assure the safe operation of nuclear reactors. CHF is the heat flux on the heated wall of nuclear fuel when heat transfer deterioration occurs. It is caused by the transforming of coolant boiling mechanism under certain thermal-hydraulic conditions. In industrial practice, reactor fuel power is non-uniformly distributed along the axial direction of a fuel rod, which will affect both the CHF positions and values under various thermal-hydraulic conditions. Hence, it implies that conventionally used uniform power distribution method for CHF prediction has its own limits in terms of reactor core design and safety analysis. In order to predict the CHF for non-uniform power distribution, some special methods such as the correction factor method were developed. In this study, a theoretical model has been developed based on the transient two-phase thermal-hydraulic condition calculation method and liquid sub-layer dry-out CHF mechanism. Both the upstream cumulative effect and local effect on CHF was taken into account in the proposed model. The calculation results of the present model and Tong's non-uniform correction factor method were compared with the experimental data. The comparison results show the present model has good capability of CHF prediction for non-uniform power distribution conditions.

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