Executive Order 12840: Nuclear Cooperation With EURATOM
President: Bill Clinton
Temporarily extended peaceful nuclear cooperation with EURATOM through March 10, 1994; EO 12903 supplied the next extension.
Status: Superseded. Is Executive Order 12840 still in effect? No. Executive Order 12840 was superseded. See Executive Order 12903: Nuclear Cooperation With EURATOM.
What does Executive Order 12840 do?
EO 12840 made the statutory determination needed to continue U.S. nuclear cooperation with EURATOM through March 10, 1994. EO 12903 superseded it on March 9, 1994 and authorized the next extension. In a contemporaneous message to Congress, President Clinton described EO 12840 as the prior one-year extension and explained the new determination; this is evidence of the succession of orders, not an assessment of the cooperation’s outcomes.
Before and after
Before the order
EO 12791 supplied the preceding temporary extension.
After the order
EO 12840 maintained cooperation for one year before EO 12903 supplied a successor extension.
Who had to do what
| Agency / office | Action | Timing / position |
|---|---|---|
| Executive branch | Continue the covered cooperation arrangement | Through March 10, 1994 |
| Responsible departments | Administer cooperation under the Atomic Energy Act | During the extension |
| President | Make any later statutory determination | EO 12903 issued March 9, 1994 |
What happened next
EO 12840 signed and EO 12791 superseded.
EO 12903 superseded EO 12840.
The President informed Congress of the next extension and identified EO 12840 as the prior one-year authority.
Official text and successor order rechecked.
Legal and source detail
How it works legally
EO 12840 was a time-limited determination under section 126 a.(2) of the Atomic Energy Act. Its operation ended when EO 12903 superseded it.
Sources by type
If a source is unavailable, first check the cited publisher or another official repository. The cited publisher remains the authority.
Primary and official sources
Orders, laws, court records and official implementation material.
How we checked this
Last checked against the sources above on September 19, 2026. How we research →