Three Mile Island nuclear power plant 1
Retired United States
Gross capacity
880MW
Three Mile Island nuclear power plant 1 is a pressurised water reactor unit at Three Mile Island nuclear power plant in United States rated at 880 MW gross. It is retired. Commercial operation began 2 Sep 1974.
Specification
| Reactor type | Pressurised water reactor (PWR) |
|---|---|
| Model | B&W 177-FAB&W LLP (DRYAMB) in the source |
| Size | Largeabove 300 MWe |
| Coolant | Light water |
| Moderator | Light water |
| Gross capacity | 880MW |
| Net capacity (reference) | 819MW |
| Net capacity (design) | 819MW |
| Thermal output | 2,568MWt |
| NSSS vendor | Babcock & Wilcoxall vendors |
| Typical enrichment | 3–5% U-235 |
Ownership & location
| Site | Three Mile Island nuclear power plant |
|---|---|
| Unit | 1 |
| Country | United States |
| Owner | Exelon Corp100% |
| Operator | Exelon Generation |
| Coordinates | 40.1539, -76.7248 |
Fuel chain for this unit
Fuel form
Uranium dioxide pellets in zirconium-alloy cladding
Enrichment
3–5% U-235
Who makes this assembly
- China National Nuclear Corporation PWR fuel assemblies
- ENUSA Industrias Avanzadas PWR and BWR fuel assemblies
- Framatome PWR fuel assemblies
- KEPCO Nuclear Fuel PWR fuel assemblies
- Mitsubishi Heavy Industries PWR fuel assemblies
- Westinghouse Electric Company PWR fuel assemblies
Upstream
Enriched fuel means this unit sits downstream of five conversion plants and four enrichment operators holding 88% of world capacity between the top three.
Fabricator capability is recorded against reactor type and model line, not against named units,
utilities do not publish fuel contracts. See the fuel chain.
Timeline
- 18 May 1968Construction start
- 5 Jun 1974First criticality
- 19 Jun 1974Grid connection
- 2 Sep 1974Commercial operation
- 20 Sep 2019Permanent shutdown
Other units at Three Mile Island nuclear power plant
| Unit | Status | Gross MW |
|---|---|---|
| Three Mile Island nuclear power plant 2 | Retired | 959 |
| Three Mile Island nuclear power plant Unit 1 Repower | Pre-construction | 880 |
Other B&W LLP (DRYAMB) units
7 units worldwide share this model designation.
| Unit | Country | Status | Gross MW |
|---|---|---|---|
| Arkansas Nuclear One nuclear power plant 1 | United States | 903 | |
| Oconee nuclear power plant 1 | United States | 891 | |
| Oconee nuclear power plant 2 | United States | 891 | |
| Oconee nuclear power plant 3 | United States | 900 | |
| Crystal River nuclear power plant 3 | United States | Retired | 890 |
| Three Mile Island nuclear power plant Unit 1 Repower | United States | Pre-construction | 880 |
Sources
- Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release , CC BY 4.0 · retrieved 2026-09-06 · this unit last researched by GEM on 2024-05-29
- GEM.wiki entry (further reading) , CC BY-SA 4.0, linked, not quoted
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data