Materials Science and Technology Division, The Development of Reversible Beading Fatigue Tester and its Application to High Burn-Up Spent Nuclear Fuel Integrity Study Under Normal Transportation Vibration.

Wang, J. J. ; Wang, H. ; Bevard, B.

Technical Information Center Oak Ridge Tennessee

关键词: Spent fuels;    Bending;    Burnup;    Cladding;    Crack propagation;   

RP-ID  :  DE141150341

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

For high burn-up spent nuclear fuel (SNF), it is expected that the spent fuel cladding will have a high population of microcracks and hydrides, including macro-hydrides and micro-hydrides. This will reduce the stress intensity required to advance the crack growth. The linking of these microcracks during vibration loading also reduces the fatigue threshold/incubation period significantly, accelerating fatigue failure. In addition to the damages in cladding, the microstructure of comprising fuel pellets and interfaces of fuel rod have changed dramatically after the high burn-up process. These modifications have a direct impact on the structural integrity and vibration response of SNF rods in transportation. As a result of that, the vibration has been included as one of mandatory testing conditions for the structural evaluation of package that is used in transporting spent nuclear fuel by US NRC (Nuclear Regulation Commission) in 10 CFR SC71.71. Currently, no testing system is available to test the spent nuclear fuel and evaluate the performance of fuel rod during the spent fuel transportation. It is the aim of this research project to develop a system that can appropriately test the response of high burn-up SNF rod in a simulated loading condition.