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http://dx.doi.org/10.1016/j.net.2022.03.005

Study on the effect of flow blockage due to rod deformation in QUENCH experiment  

Gao, Pengcheng (School of Nuclear Science and Technology, Xi'an Jiaotong University)
Zhang, Bin (School of Nuclear Science and Technology, Xi'an Jiaotong University)
Shan, Jianqiang (School of Nuclear Science and Technology, Xi'an Jiaotong University)
Publication Information
Nuclear Engineering and Technology / v.54, no.8, 2022 , pp. 3154-3165 More about this Journal
Abstract
During a loss-of-coolant accident (LOCA) in the pressurized water reactor (PWR), there is a possibility that high temperature and internal pressure of the fuel rods lead to ballooning of the cladding, which causes a partial blockage of flow area in a subchannel. Such flow blockage would influence the core coolant flow, thus affecting the core heat transfer during a reflooding phase and subsequent severe accident. However, most of the system analysis codes simulate the accident process based on the assumed channel blockage ratio, resulting in the fact that the simulation results are not consistent with the actual situation. This paper integrates the developed core Fuel Rod Thermal-Mechanical Behavior analysis (FRTMB) module into the self-developed severe accident analysis code ISAA. At the same time, the existing flow blockage model is improved to make it possible to simulate the change of flow distribution due to fuel rod deformation. Finally, the ISAA-FRTMB is used to simulate the QUENCH-LOCA-0 experiment to verify the correctness and effectiveness of the improved flow blockage model, and then the effect of clad ballooning on core heat transfer and subsequent parts of core degradation is analyzed.
Keywords
Code application & validation; Flow blockage; Fuel behavior; Peak cladding temperature; QUENCH-LOCA-0;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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