Prevention of delayed hydride cracking in zirconium alloys. International atomic energy agency, delayed hydride cracking of zirconium alloy fuel cladding, iaeatecdoc1649, iaea, vienna 2010. Delayed hydride cracking in zirconium alloys in pressure. The typical feature of dhc is presented as the intermittent fracture with the striations on the fracture surface. Cracks are seen to nucleate earlier at higher temperature. Interfacial cracking of hydride under stress is observed. Initiation and arrest of delayed hydride cracking in zr2. Precipitation of crack tip hydrides in zirconium request pdf. Given the experimental facts related to delayed hydride cracking in zirconium alloys and the dhc models proposed so far, critical comments on a combined sif and temperature model of delayed. Fracture of gamma and delta hydrides during delayed. It is shown that factors such as solution temperature, cooling rate, and applied or residual stresses greatly affect the hydride morphology and orientation. Acoustic emission monitoring of delayed hydride cracking. The project was overseen by a supervisory group of experts in the field. Using kims delayed hydride cracking dhc model, this study reanalyzes the critical temperatures for dhc initiation and arrest in zr2.
Delayed hydride cracking of zirconium alloy fuel cladding. This observation is in good agreement with available experimental studies. Zirconium alloys are susceptible to a mechanism for crack initiation and propagation called delayed hydride cracking. Massih1,2 1 quantum technologies, uppsala science park, se75183 uppsala, sweden. Simulation of the delayed hydride cracking velocity for zirconium alloy materials considering irradiation effects. Elasticplastic finite element analysis is performed using the commercial software package. Most of the failures were in the first two years of operation of the kursk and chernobyl reactors 1.