When the reactor is slanted, care must be taken to ensure {HEAD ~ that no air pockets form} in {TAIL ~ the coolant channels} 
in
When the reactor is slanted , care must be taken to ensure { HEAD ~ that no air pockets form } in { TAIL ~ the coolant channels }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL