# Who Is Being Asked to Dismantle Lithuania's RBMK-1500 Reactor Cores?

Lithuania's state-owned decommissioning company Altra has launched an international tender covering the design and physical dismantling of the reactor cores of both RBMK-1500 units at the Ignalina Nuclear Power Plant. The tender was announced on 10 July 2026, marking one of the most technically demanding procurement phases in Europe's ongoing nuclear decommissioning pipeline.

The RBMK-1500 is a Soviet-era graphite-moderated, water-cooled channel reactor — a larger-output variant of the RBMK-1000 design used at Chernobyl. Dismantling its cores is technically distinct from, and considerably more complex than, handling conventional light-water reactor internals. The graphite moderator blocks, activated metal, and channel tube structures present radiological and structural challenges that narrow the field of credible contractors substantially. No contract value or timeline was disclosed in the source material.

Ignalina was shut down under EU accession conditions: Unit 1 in 2004, Unit 2 in 2009. Decommissioning has proceeded in phases for nearly two decades, with EU funds supporting much of the work. The reactor core dismantling phase represents the most radiologically intensive work remaining.

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## Why RBMK Core Dismantling Is a Distinct Technical Challenge

The RBMK design differs fundamentally from the pressurized water reactors and [boiling water reactors](https://smrintel.com/glossary/bwr) that dominate Western decommissioning experience. Its graphite moderator — present in large volume — becomes highly activated over the reactor's operating life. Graphite presents long-term radiological concerns including carbon-14 inventory, and there is no globally standardized disposal pathway for irradiated graphite at scale.

The channel tube architecture means the core is not a single removable pressure vessel internals package, as in a PWR. Instead, thousands of individual pressure tubes, graphite blocks, and associated structures must be systematically segmented, characterized, packaged, and routed to interim or final storage. Remote tooling, shielding, and waste characterization demands are correspondingly high.

Only a handful of global contractors have direct RBMK or RBMK-adjacent dismantling experience. Russian entities that historically held that knowledge are effectively excluded from EU-funded work following geopolitical shifts post-2022, which further narrows the competitive field. Western European decommissioning specialists — firms with Magnox, AGR, or VVER experience — may bid, but direct RBMK core dismantling expertise outside the former Soviet sphere is limited.

This is not purely a technical footnote. The scarcity of qualified bidders has real procurement implications: contract terms, pricing, schedule risk, and the feasibility of meaningful competition will all be shaped by how few organizations can credibly demonstrate relevant capability.

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## Ignalina in the Broader European Decommissioning Context

Ignalina is one of the largest and most complex decommissioning projects in the European Union. The plant's RBMK-1500 units were among the highest-output reactors ever operated — the 1500 MWe rating exceeded even the standard RBMK-1000. Scale compounds every radiological and logistical challenge.

EU structural funds and the Ignalina International Decommissioning Support Fund have financed decommissioning activities since closure. The project is frequently cited as a reference case for EU-supported nuclear site remediation, and its progress — or delays — carry political as well as technical weight in Brussels discussions about nuclear liability and fund adequacy.

The tender launch is significant for the broader decommissioning industry because RBMK core dismantling methodology, once developed and executed at Ignalina, will inform any future work on the remaining operating or closed RBMK fleet in Russia. While that application is currently of academic interest given current geopolitics, the methodological IP generated here has long-term value.

For Western decommissioning contractors, Ignalina represents a [first-of-a-kind](https://smrintel.com/glossary/foak) reference project in a reactor type with no prior full-core dismantling precedent outside Russia. Winning this contract — and executing it successfully — would constitute a credible claim on future European nuclear remediation work as additional older plants approach end-of-life.

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## What Comes Next

Altra's tender covers both the design phase (engineering the dismantling methodology, tooling, and waste management approach) and the physical execution. Whether these are structured as a single integrated contract or separable lots was not specified in the available source material.

The outcome of this procurement will be a key indicator of whether the Western decommissioning supply chain can absorb RBMK-class complexity — and at what cost. Schedule and budget performance at Ignalina has historically lagged original projections, a pattern common to [FOAK](https://smrintel.com/glossary/foak) nuclear projects of any type.

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## Key Takeaways

- **Altra**, Lithuania's state-owned decommissioning entity, has launched an international tender for design and dismantling of both RBMK-1500 reactor cores at Ignalina.
- The RBMK-1500's graphite moderator and channel tube architecture make core dismantling technically distinct from — and more complex than — standard LWR decommissioning.
- Exclusion of Russian contractors from EU-funded work significantly narrows the pool of bidders with direct RBMK experience.
- No contract value, award timeline, or lot structure was disclosed in available source material.
- Ignalina core dismantling will generate the first Western-held RBMK reactor core removal methodology, with long-term value for the global decommissioning supply chain.
- The project is EU-supported and has been in progress since Unit 1 shutdown in 2004; reactor core removal represents the most radiologically intensive phase remaining.

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## Frequently Asked Questions

**What is the Ignalina Nuclear Power Plant?**
Ignalina is a Lithuanian nuclear power plant that operated two Soviet-designed RBMK-1500 reactors. Unit 1 was shut down in 2004 and Unit 2 in 2009 as conditions of Lithuania's EU accession. Decommissioning has been ongoing since, with significant EU funding support.

**What makes RBMK reactor core dismantling technically difficult?**
RBMK reactors use a graphite moderator and a channel tube architecture rather than a conventional pressure vessel. The graphite becomes highly activated during operation — accumulating significant carbon-14 and other radionuclides — and there is no globally standardized disposal route for irradiated graphite at scale. Thousands of individual pressure tubes and graphite blocks must be individually managed.

**Who can bid on the Ignalina tender?**
The tender is international, but the credible bidder pool is narrow. Russian entities with the most direct RBMK experience are effectively excluded from EU-funded work. Western contractors with Magnox, AGR, or VVER decommissioning backgrounds may bid, but none hold direct RBMK core dismantling precedent.

**What is Altra?**
Altra is the Lithuanian state-owned company responsible for managing the decommissioning of the Ignalina Nuclear Power Plant.

**Why does this matter for the broader nuclear decommissioning industry?**
A successful RBMK core dismantling at Ignalina would establish the first Western-developed methodology for this reactor type, generating intellectual property and workforce experience applicable to future European decommissioning projects. It also tests whether the Western supply chain can handle reactor types outside its standard LWR experience base.