Zr alloys are used in cores of nuclear reactors because they are relatively transparent to neutrons, which helps the efficiency of a nuclear reactor. However, as any material also Zr alloys do slowly degrade in a nuclear environment. The way the material degrades depends on its microstructural characteristics, particularly how the crystals are orientated in the material. The crystal orientation is determined by the way the material is processed and it is the aspect of manufacturing parameters and microstructure evolution in Zr alloys we want to understand much better in order to develop modelling tools in the future to predict such things.