PWR-20 (OPEN-20)
US
Basics
Reactor Type
Pressurised Water Reactor
Pressurized (light) water reactor
Primary heat transport: H2O - so-called light (normal) water
Primary heat transport: H2O - so-called light (normal) water
Reactor Description
Loop operated PWR
Electric Output (MWe)
22
Thermal Output (MWt)
40
Size
Small
'Small' size
Electric output of between 10 MWe and 100 MWe
Electric output of between 10 MWe and 100 MWe
Spectrum
Thermal
Kinetic neutron energy of 0.000…0.025 eV
Slow or cold neutron / moderated neutron spectrum
Slow or cold neutron / moderated neutron spectrum
Developer
Last Energy Inc.
Pilot Site Details
N/A
Details
Use (goal of commercial operation)
electric power generation
Deployment medium
Land-based
Design Lifetime (Years)
40
Fuel
Fuel class
LEU
Low enriched uranium
Uranium enriched to less than 5 percent U-235
Uranium enriched to less than 5 percent U-235
Fuel Type
UO2 Pellets
Uranium dioxide
Most often used uranium compound for fuel elements
Most often used uranium compound for fuel elements
Fuel Cycle
Open
Refuelling Cycle
N/A
Cooling & Temperature
Reactor cooling of primary loop
Light Water
Deuterium-depleted water
Containing the natural proportion (or less) of deuterium oxide, i.e. about 0.02 percent
Containing the natural proportion (or less) of deuterium oxide, i.e. about 0.02 percent
Reactor moderator
Light Water
Deuterium-depleted water
Containing the natural proportion (or less) of deuterium oxide, i.e. about 0.02 percent
Containing the natural proportion (or less) of deuterium oxide, i.e. about 0.02 percent
Reactor Outlet Temperature (°C)
312
Status
Design status
Detailed design
Licensing status
- 2022 - Completed detailed...
- 2022 - Completed detailed design
- 2021 - Pre-conceptual design completed for 20-MW plant
Deployment timeline
- 2027 - Targeted assembly line...
- 2027 - Targeted assembly line manufacturing
- 2027 - First power at former coal plant site in Bridgend, south Wales
Agreements and Engagement
- Oct 2024 - Last Energy (Project...
- Oct 2024 - Last Energy (Project Quantum) selected among nine projects for support under EU SMR industrial alliance. Selection doesn’t mean funding but allows collaboration between SMR developers, regulators, and supply chain
- Oct 2024 - Last Energy UK subsidiary revealed plans to build £300m (€359m, $391m) micro nuclear project in Wales
- Mar 2023 - Last Energy said it had power purchasing agreements for 34 SMRs in Poland and UK
- Early 2023 - Enea cancelled letter of intent with LastEnergy
- Jul 2022 - MoU signed with Poland's Legnica special economic zone for deployment of up to 10 units
- Jun 2022 - Letter of intent signed with Poland's utility Enea for potential deployment
- Mar 2022 - MoU signed with Poland's Katowice special economic zone
- Mar 2022 - Romanian PM announced Last Energy will build a demonstrator with Romania's 'RATEN in Mioveni
- In 2020 - Launch of OPEN100 (open source 100-MW PWR) for technical and economic validation
