| Acronym | Meaning |
| GWS | Gateway Service |
| RRB | Risk Reduction Branch |
| EPA | Environmental Protection Agency |
| TLS | Tunable Laser Spectroscopy |
| ACL | Advanced Computing Laboratory |
| BART | Bay Area Rapid Transit |
| BRITE | Basic Research In Industrial Technologies Europe |
| IT | Information Technology |
| ISPRA | N/A |
| APET | Accident Progression Event Tree |