one- - outp
- one-cycle reactor
- one-dimensional
- one-group equation
- one-group function
- one-group method
- one-group model
- one-group theory
- one-group treatment
- one-half period
- one-hole stopper
- one-line diagram
- one-of-a-kind
- one-of-a-kind design
- one-of-a-kind design class
- one-out-of-two system
- one-pass core
- one-phase flow
- one-piece
- one-piece forged
- one-purpose plant
- one-region reactor
- one-rod scram
- one-section reactor
- one-side irradiation
- one-speed diffusion theory
- one-stage
- one-stage process
- one-stage reheat
- one-step reprocessing
- one-stop licensing
- one-stop permit
- one-to-one dependence
- one-velocity
- one-velocity reactor
- one-velocity theory
- one-zone beryllium blanket
- onflow
- ongoing
- ongoing maintenance
- onion-exchange bed
