Each fuel rod is identified during its travel and positioned according to {HEAD ~ an identifying code} carried on {TAIL ~ its lower end plug} which designates the fuel enrichment and additive level of the rod 
carried on
Each fuel rod is identified during its travel and positioned according to { HEAD ~ an identifying code } carried on { TAIL ~ its lower end plug } which designates the fuel enrichment and additive level of the rod
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH