scholarly journals Iodine and cesium in oxide fuel pellets and zircaloy-4 cladding of irradiated fuel rods (LWBR Development Program)

1979 ◽  
Author(s):  
D.M. Ivak ◽  
L.A. Waldman
Keyword(s):  
Development Program ◽  
Oxide Fuel ◽  
Fuel Rods ◽  
Fuel Pellets ◽  
Irradiated Fuel

Zirconia thickness measurements for irradiated fuel rods: an approach to better understanding measurement error

2011 ◽  
pp. 107-114
Author(s):  
B. Lacroix ◽  
T. Martella ◽  
M. Pras ◽  
M. Masson-Fauchier ◽  
L. Fayette
Keyword(s):  
Measurement Error ◽  
Fuel Rods ◽  
Thickness Measurements ◽  
Irradiated Fuel

Identification of Non-Linear Vibration Parameters of a Nuclear Fuel Rod

2018 ◽  
Author(s):  
Marco Amabili ◽  
Prabakaran Balasubramanian ◽  
Giovanni Ferrari ◽  
Stanislas Le Guisquet ◽  
Kostas Karazis ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Harmonic Balance Method ◽  
Resonance Phenomenon ◽  
Pressurized Water ◽  
Fuel Rods ◽  
Fuel Rod ◽  
Fuel Pellets ◽  
Safety Margins ◽  
Fuel Assemblies ◽  
Non Linear

In Pressurized Water Reactors (PWR), fuel assemblies are composed of fuel rods, long slender tubes filled with uranium pellets, bundled together using spacer grids. These structures are subjected to fluid-structure interactions, due to the flowing coolant surrounding the fuel assemblies inside the core, coupled with large-amplitude vibrations in case of external seismic excitation. Therefore, understanding the non-linear response of the structure and, particularly, its dissipation, is of paramount importance for the choice of safety margins. To model the nonlinear dynamic response of fuel rods, the identification of nonlinear stiffness and damping parameters is required. The case of a single fuel rod with clamped-clamped boundary conditions was investigated by applying harmonic excitation at various force levels. Different configurations were implemented testing the fuel rod in air and in still water; the effect of metal pellets simulating nuclear fuel pellets inside the rods was also recorded. Non-linear parameters were extracted from some of the experimental response curves by means of a numerical tool based on the harmonic balance method. The axisymmetric geometry of fuel rods resulted in the presence of a one-to-one internal resonance phenomenon, which has to be taken into account modifying accordingly the numerical identification tool. The internal motion of fuel pellets is a cause of friction and impacts, complicating further the linear and non-linear dynamic behavior of the system. An increase of the equivalent viscous-based modal damping with excitation amplitude is often shown during geometrically non-linear vibrations, thus confirming previous experimental findings in the literature.

scholarly journals FRAPCON-2: A Computer Code for the Calculation of Steady State Thermal-Mechanical Behavior of Oxide Fuel Rods

1981 ◽  
Author(s):  
G. A Berna ◽  
◽  
M. P. Bohn ◽  
W. N. Rausch ◽  
R. E. Williford ◽  
...  
Keyword(s):  
Steady State ◽  
Mechanical Behavior ◽  
Computer Code ◽  
Oxide Fuel ◽  
Fuel Rods

scholarly journals Plutonium release from pressed plutonium oxide fuel pellets in aquatic environments

1983 ◽  
Author(s):  
J Patterson ◽  
F Steinkruger ◽  
G Matlack ◽  
R Heaton ◽  
K Coffelt ◽  
...  
Keyword(s):  
Aquatic Environments ◽  
Oxide Fuel ◽  
Fuel Pellets

scholarly journals FRAP-T6: A computer code for the transient analysis of oxide fuel rods

1985 ◽  
Vol 88 (3) ◽  
pp. 341-355 ◽  
Author(s):  
L.J. Siefken ◽  
G.A. Berna ◽  
V.N. Shah
Keyword(s):  
Transient Analysis ◽  
Computer Code ◽  
Oxide Fuel ◽  
Fuel Rods
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