Development of mechanistic cladding rupture model for severe accident analysis and application in PHEBUS FPT3 experiment

Nuclear Engineering and Technology

Jianqiang Shan¹  Jishen Li²  Pengcheng Gao³  Bin Zhang³ 

[1] Corresponding author. State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.;State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China;School of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China;

关键词: Code application &;    validation;    Severe accident;    Fuel behavior;    Cladding rupture;    PHEBUS FPT3;   

DOI  :  

来源: DOAJ

【 摘 要 】

Cladding ballooning and rupture are the important phenomena at the early stage of a severe accident. Most severe accident analysis codes determine the cladding rupture based on simple parameter models. In this paper, a FRTMB module was developed using the thermal-mechanical model to analyze the fuel mechanical behavior. The purpose is to judge the cladding rupture with the severe accident analysis code. The FRTMB module was integrated into the self-developed severe accident analysis code ISAA to simulate the PHEBUS FPT3 experiment. The predicted rupture time and temperature of the cladding were basically consistent with the measured values, which verified the correctness and effectiveness of the FRTMB module. The results showed that the rising of gas pressure in the fuel rod and high temperature led to cladding ballooning. Consequently, the cladding hoop strain exceeded the strain limit, and the cladding burst. The developed FRTMB module can be applied not only to rod-type fuel, but also to plate-type fuel and other types of reactor fuel rods. Moreover, the FRTMB module can improve the channel blockage model of ISAA code and make contributions to analyzing the effect of clad ballooning on transient and subsequent parts of core degradation.

【 授权许可】

Unknown