{HEAD ~ The absorber rod} comprises {TAIL ~ cladding} of stainless steel closed by plugs and containing a column of absorber pellets e.g. of boron carbide 
comprises
{ HEAD ~ The absorber rod } comprises { TAIL ~ cladding } of stainless steel closed by plugs and containing a column of absorber pellets e.g. of boron carbide
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH