FEMAXI-IV: A computer code for the analysis of thermal and mechanical behavior of light water reactor fuel rods

Mechanical behaviors of the dispersion nuclear fuel plates induced by fuel particle swelling and thermal effect II: Effects of variations of the fuel particle diameters

“…where T denotes the temperature in Kelvin with the application range from 300 K to 1530 K.The elastic modulus of UO 2 fuel particles can be described as [25] E ¼ 2:26 Â 10 11 ½1 À 1:131 Â 10 À4 ðT À 273:15Þ½1 À 2:62ð1 À DÞ…”

“…The Misses hardening rule of UO 2 fuel particles is as the following [23] r ¼ 66:9 À 0:0397T þ ð520:0 À 0:0386TÞ e p T 6 1200 C 36:6 À 0:0144T þ ð139:5 À 0:0688TÞ e p T > 1200 C ð6Þ where r is the Misses equivalent stress, whose unit is kg/mm 2 ; e p is the equivalent plastic strain. The total swelling of fuel particles include three parts: gas-bubble swelling, solid fission product swelling and densification due to variation of the porosity [24][25][26].…”

Research on the interfacial behaviors of plate-type dispersion nuclear fuel elements

“…where T denotes the temperature in Kelvin with the application range from 300 K to 1530 K. The elastic modulus of UO 2 fuel particles can be described as [19] E ¼ 2:26 Â 10 11 ½1 À 1:131 Â 10 À4 ðT À 273:15Þ½1 À 2:62ð1 À DÞ ð38Þ where E is the elastic modulus, whose unit is Pa. T is the temperature in Kelvin and D is the theoretical density (92-98%). In addition, Poisson ratio m is set to be 0.316.…”

“…For our FEM calculations, the following simplified relations [18][19][20] for UO 2 in PWRs will be used. where T is the temperature in Kelvin.…”

Modeling of the heat transfer performance of plate-type dispersion nuclear fuel elements

“…For our FEM calculations, the following simplified relations [17][18][19] for UO 2 in PWRs will be used b gs V ¼ 1:122  10 3 expðÀ1:645  10 4 =ðT À 100ÞÞ; ð11Þ…”