376 / | HD | INDUCED NUCLEAR REACTIONS: PROCESSES, SYSTEMS, AND ELEMENTS |
409 | DF | FUEL COMPONENT STRUCTURE {10} |
426 | DF | .~ Plural fuel segments or elements {8} |
434 | DF | .~.~ In pack or bundle {10} |
449 | .~.~.~ Having provision or structure for insertion of control elements therein |