Integrating a multi-layer deformation model in FRAPTRAN for accident Tolerant fuel analysis

作     者：He, Yanan Shirvan, Koroush Wu, Yingwei Su, Guanghui 

作者机构：Xi An Jiao Tong Univ Dept Nucl Sci & Technol State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China MIT Dept Nucl Sci & Engn Cambridge MA 02139 USA 

出 版 物：《ANNALS OF NUCLEAR ENERGY》 (核能纪事)

年 卷 期：2019年第133卷

页      面：441-454页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 

基　　金：China Scholarship Council National Natural Science Foundation of China 

主　　题：Fuel performance ATF RIA LOCA SiC 

摘      要：Fuel performance analysis capability is needed to assess proposed Accident Tolerant Fuel (ATF) designs. In this work, a deformation model was implemented in FRAPTRAN 2.0 to model a multi-layer ATF concept during both reactivity-initiated accident (RIA) and loss-of-coolant accident (LOCA). The modified FRAPTRAN (M-FRAPTRAN) performance was assessed against limited UO2-Zircaloy validation database and the performance was found to be comparable to FRAPTRAN 2.0 and experimental data. Finally, in order to demonstrate the added capabilities in M-FRAPTRAN, two-layer SiC clad design consisting of SiC/SiC ceramic matrix composite (CMC) and monolithic SiC (mSiC) was modeled. During RIA, the onset of pellet clad mechanical interaction can significantly raise the mSiC principal stresses. During LOCA, the SiC potential annealing behavior (recovery of swelling strain) has a significant influence on cladding stress distribution and outer region of mSiC cladding may undergo tensile stress, which can threaten the leak tightness of the cladding during LOCA. (C) 2019 Elsevier Ltd. All rights reserved.