| Abbreviation | Definition |
|---|---|
| INSEP | International Nuclear Safeguards Engagement Program |
| INSP | International Nuclear Safety Program |
| INSTAR | International Nuclear Security Techniques for Advanced Reactors |
| INT | Institute of Nuclear Theory |
| INVO | Iraq Nuclear Verification Office |
| IPNS | Institute of Particle and Nuclear Studies |
| IRNN | Iteratively Reweighted Nuclear Norm |
| IT | Isomeric Transition |
| IWIN | Indonesia Women In Nuclear |
| JET | Joint European Torus |
| JINR | Joint Institute for Nuclear Research |
| JNC | Japan Nuclear Cycle |
| JNCM | Japan Nuclear Crowd Map |
| JNES | Japan Nuclear Energy Safety |
| JNFL | Japan Nuclear Fuel Limited |
| JNRC | Joint Nuclear Research Center |
| JNRC | Jordan Nuclear Regulatory Commission |
| KHNP | Korea Hydro & Nuclear Power |
| KNP | Korea Nuclear Partners |
| KSNP | Korean Standardized Nuclear Plant |