“…It has been recently reported that H/D charged Zircaloy-4 sample shows, two types of (>μm sized) intergranular hydrides, described in two distinct type if the hydride is along (a-type) or perpendicular (btype) to the grain boundary, that appear to be different to those growing at twin boundaries (for more details see ref [18]). At the length scale seen in the SEM or during FIB preparation, please note that what we tend to refer to as a hydride is often actually an assembly of smaller hydrides, i.e.…”