Hydrogen motion in Zircaloy-4 cladding during a LOCA transient

Modelling of Zircaloy cladding primary creep during load drop and reversal

Modelling fuel behaviour requires an accurate description of the cladding stress response for both operational and safety considerations. The transient creep response of Zirconium alloys is commonly modelled using a strain hardening rule which is known to hold in cases with monotonously increasing stresses. However, the strain hardening rule is experimentally known to fail in scenarios such as ...

Modeling of Zircaloy cladding primary creep during load drop and reversal

Modeling fuel behavior requires an accurate description of the cladding stress response for both operational and safety considerations. The transient creep response of Zirconium alloys is commonly modeled using a strain hardening rule which is known to hold in cases with monotonously increasing stresses. However, the strain hardening rule is experimentally known to fail in scenarios such as loa...

Preferential Field Evaporation during Atom Probe Analysis of Zircaloy-4

SEM and EPMA analysis of un-usual hydride structure in in-pile cracked Zircaloy-cladding

The hydride distribution in a cracked Zircaloy cladding tube has been investigated by neutron radiography, Scanning Electron Microscopy (SEM) and Hydrogen measurements. The crack occurred during handling in the spent fuel pool. Back Scattered Electron images showed some unexpected contrasts in zones with high hydrogen concentrations near cracks. This phase has been studied by SEM and EPMA. Afte...

The Influence of Hydrogen on the Deformation Behavior of Zircaloy-4

The deformation behavior of Zr-based cladding forms a basis for fuel behavior codes and affects failure criteria; as such, it is critical to reactor safety. The present study examines the influence of hydrogen on the uniaxial deformation behavior of hydrided cold worked and stressrelieved Zircaloy-4 plate material. Specimens of various orientations (i.e., stress axis aligned with the rolling di...