Blykalla
Swedish developer of SEALER-55, a 55 MWe lead-cooled reactor, with reactor parks of six to eight units under application in Sweden.
Facts
Source per value- DesignThe company's lead reactor design name(s) as the company or its regulator names them; semicolon-separated when it markets more than one.
- SEALER-55; SEALER-One prototype 1
- TypeReactor coolant/technology family. Gas-cooled fast is separated from thermal HTGR designs; sodium-cooled includes both fast and thermal-spectrum designs.
- Lead-cooled 1
- Size classDerived from published electric output per module: Micro is 20 MWe or less, Small is above 20 and up to 300 MWe, Medium is above 300 MWe. Legacy heat-only classifications use one third of thermal output as an explicit comparison convention, not a claimed electric rating.
- Small 2
- MWe / module MWeNet (or gross where only gross is published) electric output of one reactor module as the company or its regulator publishes it. Null for heat-only designs.
- 55 2
- MWt / module MWtThermal output of one reactor module as published by the company or its regulator.
- Not published
- FuelFuel form and enrichment class as published (for example LEU UO2, HALEU TRISO, fuel salt).
- Not published
- Licensing stageFurthest licensing milestone reached with any national regulator: Operating; Construction licensed (construction permit or licence issued); DOE test authorization (a test reactor authorized or built under the US Department of Energy, for example the Reactor Pilot Program or the DOME test bed); Construction under review (construction, site or creation application filed); Design approved (design certification, standard design approval or GDA completed); Design review (formal design review under way, such as UK GDA, CNSC vendor design review or a French safety-options review); Pre-licensing (pre-application engagement only).
- Construction under review 2
- RegulatorsNational regulators the company has formally engaged (NRC, CNSC, ONR, ASN, and others), semicolon-separated.
- SSM; Swedish Government 2
- Licensing detailThe milestones behind the licensing stage, by regulator, with dates.
- Applied to the Swedish Government in May 2026 for a reactor park at Norrsundet (Gävle) and in August 2026 for a second park of up to 440 MW at Untra (Tierp). SSM review follows government approval. 2
- Latest milestoneDate of the milestone that sets the licensing stage (for example the day a construction permit was issued or an application docketed).
- Not published
- First siteLocation of the first-of-a-kind commercial or demonstration unit, with the owner or host.
- Oskarshamn: non-nuclear electric pilot facility with Uniper (ground broken February 2025) 1
- First powerYear the company or its host utility targets for first operation (criticality or commercial operation, as stated) of the first unit. A plan, not a guarantee.
- Not published
- OwnershipPublic (listed shares), Private (venture or privately held), Subsidiary (a unit or joint venture of a larger company) or State-owned.
- Private 1
- TickerExchange and ticker of the company or its listed parent.
- Not published
- ListedFirst trading day of the company's shares (or its listed parent's current ticker) on the exchange named in Ticker.
- Not published
- FundingHeadline funding: equity raised, public listing, government cost-share awards (DOE ARDP, GAIN, Great British Nuclear and others), with amounts and dates.
- About $50 million co-led by Oklo, Norrsken Launcher and Armada (December 2025); €15 million EIC equity and €2.5 million grant (February 2025). 13
- Data-center dealTrue when the company has a signed, announced agreement (PPA, framework, MOU, investment or capacity reservation) with a hyperscaler or data-center operator.
- Not published
- Data-center partnersHyperscalers and data-center operators the company has a signed or announced agreement with, semicolon-separated.
- Not published
- Data-center dealsWhat each data-center or hyperscaler agreement covers: partner, type of agreement, capacity and date.
- Not published
- HQCountry of the company's headquarters.
- Sweden 1
- RegionHeadquarters region.
- Europe 1
Sources
- Blykalla raises $50M accessed 2026-11-11
- Blykalla: second reactor park application accessed 2026-11-11
- NucNet: €15M European investment accessed 2026-11-11
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