Rosatom reported on 7 October 2026 that two separator-superheaters, each 16 metres tall and weighing 95 tonnes, have been placed in their design positions in the turbine hall of BREST-OD-300 at Seversk, Russia. The plant is still under construction. The installation is a construction milestone, not a sign that the reactor is generating power.
What was installed, and where
According to Rosatom’s announcement, two separator-superheaters were set in their design positions in the turbine hall at the BREST-OD-300 site. Each unit is reported at 16 metres tall and 95 tonnes. Both figures come from the project owner and describe the equipment as delivered and positioned; Rosatom did not publish independent measurements.
The site is in Seversk, Tomsk Region, on the grounds of the Siberian Chemical Combine. BREST-OD-300 is the power unit of Rosatom’s Pilot-Demonstration Energy Complex and is part of the company’s Proryv (Breakthrough) strategic project, which aims to develop nuclear energy systems built on fast reactors and a closed nuclear fuel cycle.
What a separator-superheater does
A separator-superheater is large heat-exchange equipment used at two-circuit nuclear power plants. In this plant its job is to prepare steam before it reaches the low-pressure cylinder of the turbine. Rosatom gives two reasons for the step, and both are about protecting and improving the turbine:
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- Blade protection. Water droplets in wet steam erode turbine blades. Removing moisture and conditioning the steam before it enters the low-pressure section reduces that erosion.
- Efficiency. Rosatom says the equipment improves the efficiency of the whole steam-turbine installation.
Rosatom’s own wording, in Russian, reads: «Его основная задача — подготовка пара для цилиндра низкого давления турбины. Это необходимо для защиты лопаточного аппарата турбины от эрозии каплями воды и для повышения коэффициента полезного действия всей паротурбинной установки.» The announcement does not attribute this explanation to a named engineer or official, so it should be read as the company’s institutional description.
Two circuits, two different jobs
The term “separator-superheater” is easy to confuse with the reactor’s cooling loop, because both sit inside a plant that uses liquid metal and steam. They do different work and sit in different parts of the plant. Rosatom’s September 2026 construction update describes the reactor’s primary circuit, which circulates lead coolant from the core to steam generators housed in peripheral cavities. The October equipment belongs to the power-conversion side, downstream of the steam generators.
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| Feature | Primary lead-coolant circuit | Turbine-hall separator-superheaters |
|---|---|---|
| Location | Reactor and its peripheral cavities | Turbine hall |
| Working fluid | Lead coolant | Steam |
| Role | Carries heat from the reactor core to the steam generators | Prepares steam for the turbine’s low-pressure cylinder |
| Reported dimensions | Not stated in the reviewed Rosatom update | 16 m tall and 95 t each, two units (Rosatom, 7 October 2026) |
| Construction status reported | Work on the reactor vessel concrete scheduled to finish in winter 2027 (Rosatom, 14 September 2026) | Installed in design positions (Rosatom, 7 October 2026) |
What BREST-OD-300 is, and what it is not yet
Rosatom describes BREST-OD-300 as the world’s first power reactor with a lead coolant, and as a 300 MW power unit. The 300 MW figure is the planned rating in Rosatom’s 2026 project description, not a measured output, because the plant has not started operating.
That distinction matters for the headline. Installing equipment in the turbine hall shows that a major part of the power-conversion system has reached its design location. It does not show that the reactor has started, that the turbine is in place, or that electricity is being produced.
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Schedule: what is reported and what is still a forecast
World Nuclear News reported on 7 October 2026 that concrete work on the foundation for the turbine and generator began in May 2026. It also reported Rosatom’s plan to finish the turbine-unit foundation by the end of 2026, which would allow turbine installation to begin. That is a plan as of the October report. Neither the foundation’s completion nor the turbine’s installation has been confirmed.
The reactor-building schedule is separate. Rosatom’s September 2026 update said concrete work on the reactor vessel was scheduled to finish in winter 2027. Readers should not merge the two timelines: the turbine foundation and the reactor vessel are different milestones on different parts of the site.
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Key points to take away
- Two separator-superheaters were installed in the BREST-OD-300 turbine hall, according to Rosatom’s 7 October 2026 announcement.
- Each is reported at 16 metres tall and 95 tonnes.
- Their role is to prepare steam for the low-pressure turbine cylinder, protecting blades from water-droplet erosion and improving steam-turbine efficiency, per Rosatom.
- The plant is a lead-cooled fast-reactor power unit under construction, not an operating station.
- The end-2026 turbine-foundation completion is a reported plan that has not been confirmed as finished.
For readers who came to this story through its “first” headline: the claim that BREST-OD-300 is the first power reactor with a lead coolant is Rosatom’s characterization. Independent operating experience with such a plant does not yet exist, so the claim describes design and category rather than demonstrated performance.
No independent testing of the equipment has been reported, and this article does not add any.
Source notes: Rosatom, official announcement, 7 October 2026; Rosatom, construction update, 14 September 2026; World Nuclear News, 7 October 2026.
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