| Reactor and Engine Systems Tests | |
| Name | Date |
| Kiwi B4D (one power test) | May1964 |
| Kiwi B4E (two power tests) | Aug 1964 - Sep 1964 |
| NRX-A2 (two power tests) | Sep 1964 - Oct 1964 |
| Kiwi-TNT | Jan 1965 |
| NRX-A3 (three power tests) | Apr 1965 - May 1965 |
| Phoebus-1A (one power test) | Jun 1965 |
| NRX/EST (ten starts) | Dec 1965 - Mar 1966 |
| NRX-A5 (two power tests) | Jun 1966 |
| Phoebus 1B (one power test) | Feb 1967 |
| Phoebus 2 (cold flow tests) | Jul 1967 - Aug 1967 |
| NRX-A6 (one power test)* | Dec 1967 |
| XECF (cold flow tests) | Feb 1968 - Apr 1968 |
| Phoebus-2A (three power tests) | Jun 1968 - Jul 1968 |
| Pewee-1 (two power tests) | Nov 1968 - Dec 1968 |
| XE (28 starts) | Dec 1968 - Aug 1969 |
| *Operated 60 minutes at full power (1,100MW) | |