Timeline
| Date | Event |
|---|---|
| 1968–1970 | Construction |
| April 1974 | Reactor-1 online |
| Feb 1978 | Reactor-2 online |
| March 1979 | TMI-2 accident occurred. Containment coolant and unknown amounts of radioactive contamination released into environment. |
| April 1979 | Containment steam vented to the atmosphere in order to stabilize the core. |
| July 1980 | Approximately 1,591 TBq (43,000 curies) of krypton were vented from the reactor building. |
| July 1980 | The first manned entry into the reactor building took place. |
| Nov. 1980 | An Advisory Panel for the Decontamination of TMI-2, composed of citizens, scientists, and State and local officials, held its first meeting in Harrisburg, PA. |
| July 1984 | The reactor vessel head (top) was removed. |
| Oct. 1985 | Defueling began. |
| July 1986 | The off-site shipment of reactor core debris began. |
| Aug. 1988 | GPU submitted a request for a proposal to amend the TMI-2 license to a "possession-only" license and to allow the facility to enter long-term monitoring storage. |
| Jan. 1990 | Defueling was completed. |
| July 1990 | GPU submitted its funding plan for placing $229 million in escrow for radiological decommissioning of the plant. |
| Jan. 1991 | The evaporation of accident-generated water began. |
| April 1991 | NRC published a notice of opportunity for a hearing on GPU's request for a license amendment. |
| Feb. 1992 | NRC issued a safety evaluation report and granted the license amendment. |
| Aug. 1993 | The processing of accident-generated water was completed involving 2.23 million gallons. |
| Sept. 1993 | NRC issued a possession-only license. |
| Sept. 1993 | The Advisory Panel for Decontamination of TMI-2 held its last meeting. |
| Dec. 1993 | Post-Defueling Monitoring Storage began. |
| Oct. 2009 | TMI-1 license extended from April 2014 until 2034. |
Read more about this topic: Three Mile Island Accident