| 376 / | HD | INDUCED NUCLEAR REACTIONS: PROCESSES, SYSTEMS, AND ELEMENTS |
| 245 | DF | TESTING, SENSING, MEASURING, OR DETECTING A FISSION REACTOR CONDITION {10} |
| 250 | DF | .~ Leak detection {1} |
| 251 | | .~.~ Fuel element leak detection {2} |
| 252 | DF | .~.~.~> By acoustic or ultrasonic wave energy |
| 253 | DF | .~.~.~> By the detection of fission products external to the fuel element |