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Rosatom reported on 7 October 2026 that two separator-superheaters, each 16 metres tall and weighing 95 tonnes, had been installed in their design positions in the turbine hall of BREST-OD-300 in Seversk, Tomsk Region, Russia. The milestone is a construction step. BREST-OD-300 is still under construction, and nothing in the announcement indicates that the plant is operating or generating electricity.
What was installed
According to Rosatom’s announcement, the installation consists of the following:
- Number of units: two separator-superheaters.
- Height: 16 metres per unit.
- Mass: 95 tonnes per unit.
- Location: the turbine hall at the BREST-OD-300 construction site in Seversk.
- Status: placed in their design positions, which Rosatom presents as the completion of this installation step.
Rosatom uses the term “separator-superheater” for this equipment. The announcement does not describe its internal design, so this article does not either. Readers should not assume these are off-the-shelf standalone steam separators.
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What a separator-superheater does
Rosatom describes the equipment as large heat-exchange apparatus used at two-circuit nuclear power plants. Its job at BREST-OD-300 is to prepare steam before it reaches the turbine’s low-pressure cylinder. Rosatom gives two reasons for this step: it protects the turbine blades from erosion caused by water droplets, and it raises the efficiency of the whole steam-turbine unit.
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The company’s explanation, 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.»
An English rendering: “Its main task is preparing steam for the low-pressure cylinder of the turbine. This is needed to protect the turbine’s blade assembly from erosion by water droplets and to raise the efficiency of the entire steam-turbine plant.” The statement is an unattributed corporate explanation from Rosatom, not a quotation from a named engineer or official.
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Where BREST-OD-300 fits
BREST-OD-300 is being built at the Siberian Chemical Combine in Seversk. Rosatom describes it as the power unit of its Pilot-Demonstration Energy Complex, which belongs to the wider Proryv (Breakthrough) strategic project. Rosatom says the initiative aims to develop nuclear energy systems based on fast reactors and a closed nuclear fuel cycle.
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Rosatom characterises the unit as a 300 MW power unit and as the world’s first power reactor with a lead coolant. Both are planned design parameters and project descriptions. They are not measurements of current output. The “world’s first” wording is Rosatom’s own claim, and this article attributes it that way.
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Two circuits, two different jobs
The turbine-hall equipment is easy to confuse with the reactor’s heat-transfer system, so the two are compared below. Rosatom’s September 2026 construction update describes the primary circuit. The October announcement describes the turbine-hall equipment.
| Item | Reactor primary circuit | Separator-superheaters |
|---|---|---|
| Role | Circulates lead coolant from the core to steam generators in peripheral cavities | Prepare steam for the turbine’s low-pressure cylinder |
| Location | Reactor section of the plant | Turbine hall |
| Stated purpose | Carries heat from the reactor core | Protect turbine blades from water-droplet erosion and improve steam-turbine efficiency, per Rosatom |
| Quantity and size | Not stated in the sources reviewed | Two units, each 16 m tall and 95 tonnes |
| Source | Rosatom, 14 September 2026 | Rosatom, 7 October 2026 |
Schedule and what is still ahead
The milestones reported so far fall into two separate tracks: the turbine-unit foundation and the reactor vessel. They should not be read as one timeline.
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- High-Quality Materials: The entire unit is copper brazed at edges and contact points, forming a durable and leak-resistant piece that withstands high pressure and temperature. CE certified for reliable quality.
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- Efficient Heat Transfer: The heat exchanger generates up to 160kBtu per hour, with 12 aluminum fins per inch and 3 rows of 3/8" seamless copper tubes. The threaded copper tubes increase the contact area and capacity of the fluid medium, significantly enhancing the heat exchanger's performance.
- Large Heat Exchange Area: With an effective heat exchange area of 20”x20” and 242 fins, this heat exchanger provides excellent heat transfer performance to meet various needs.
- Tight and Leak-Proof: To eliminate the possibility of micro-leaks, the heat exchanger uses high-pressure vacuum brazing and undergoes rigorous leak testing, ensuring long life and high reliability.
| Milestone | Reported status | Source and date |
|---|---|---|
| Concrete work on the turbine and generator foundation | Began in May 2026 | World Nuclear News, reported 7 October 2026 |
| Completion of the turbine-unit foundation | Planned for the end of 2026, which would allow turbine installation. This is a forecast, not a completed task. | World Nuclear News, reported 7 October 2026, citing Rosatom’s plan |
| Separator-superheaters installed | Reported as installed in design positions | Rosatom, 7 October 2026 |
| Concrete work on the reactor vessel | Scheduled to finish in winter 2027 | Rosatom, 14 September 2026 |
No confirmed turbine installation date has been published. Readers should treat the end-of-2026 foundation target as a plan that could change.
Quick Recap
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- Excellent Quality: This brazed plate heat exchanger is made of high-quality SS316L stainless steel, brazed with copper in a vacuum environment, ensuring a reliable and robust component. It offers superior resistance to high temperatures, high pressures, corrosion, and leaks, playing an excellent role in supporting various refrigeration, heating, high-temperature, and high-pressure industrial fields.
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What the announcement does not establish
- Operation: BREST-OD-300 is not reported as operating, and no electricity output has been reported.
- Turbine status: the turbine itself is not reported as installed.
- Performance: no efficiency gain, steam-quality figure or test result has been published for the separator-superheaters. Rosatom’s efficiency claim is a stated design purpose.
- Independent verification: the dimensions and installation come from Rosatom’s own announcement. World Nuclear News reported on the same milestone, but the sources reviewed for this article do not include independent measurements.
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