Rooppur's First Criticality: Bangladesh Enters the Nuclear Age — and the Steel Story Behind It

Bangladesh has joined the small club of countries operating a nuclear power reactor. At 15:34 on 11 October 2026, Rooppur Unit 1 achieved first criticality — a controlled, self-sustaining fission chain reaction — roughly nine years after the first concrete was poured on the bank of the Padma River. It is the most consequential energy event in the country's history, and the latest chapter in a long, controversial and steel-intensive build.

At the time of writing, Unit 1 had not yet been connected to the national grid. The next milestones — power start-up and synchronisation — are targets, not achievements, and should be read as such.

What actually happened in October 2026

Three events in the space of five days define the current status of the project:

On 12 October, Rosatom also announced that JSC Rosatom Automated Control Systems (RASU) had completed installation of automated process control systems (APCS) at both units. According to Rosatom, Rooppur is the first foreign plant to deploy its Operator Information Support System — a detail that matters more than it appears, because instrumentation and control is where a first-of-a-kind operator most depends on vendor support.

Criticality is not the finish line. It is the point at which the fuel, the moderator, the control systems and the procedures all prove they work together. Everything after — power ascension, turbine roll, grid synchronisation, trial and then commercial operation — is a sequence of tests designed to fail safely before the plant is asked to earn.

The project in numbers

Who is building it

The contracting structure is simpler than the project's geopolitics:

• Owner and client: Bangladesh Atomic Energy Commission (BAEC), under the Ministry of Science and Technology.
• General contractor (EPC): JSC Atomstroyexport (ASE), the engineering division of Rosatom. ASE signed the General Contract and provides engineering, procurement and construction services. This resolves a gap in early reporting on the project: an EPC contractor does exist and it is ASE.
• Regulator: Bangladesh Atomic Energy Regulatory Authority (BAERA), which issued the site licence in 2016, the operating licence in April 2026 and the B-2 commissioning authorisation in October 2026.
• Reactor island equipment: Atommash / AEM-Technology, Rosatom's mechanical engineering division in Volgodonsk, Russia.
• Automation and control: JSC Rosatom Automated Control Systems (RASU).

The financing arrangement — Russian state credit funding the overwhelming majority of the cost — is the reason the project has survived a decade of political change in Dhaka. It is also the source of the project's exposure: repayment terms, currency risk and the question of what happens to spare-parts and fuel supply under sanctions pressure all sit with Bangladesh, not with the vendor.

The steel inside a VVER-1200

For a project of this scale, steel is not a line item — it is the skeleton, the skin and much of the safety case.

Reactor pressure vessels. Each VVER-1200 vessel is a large forged and welded pressure boundary. The Unit 2 vessel was hydraulically tested by Atommash in the first half of 2021 at 24.5 MPa, approximately 1.4 times its working pressure, and was installed in its design position on 19 October 2022. Vessels of this class require heavy-gauge, high-toughness forging stock and welding consumables to nuclear-grade specifications — a supply chain that in practice runs through a small number of qualified Russian and European mills.

Containment and structures. The inner containment is a pre-stressed concrete shell lined and reinforced with substantial steelwork. A 230-tonne steel structure forming the final tier of the Unit 1 inner-containment dome was manufactured and installed in 2021. Cable tunnels, security-system buildings and auxiliary facilities have generated their own steel-structure procurement — one tender alone covered fabrication and supply of steel structures for multiple cable-tunnel and cable-security facilities, and a November 2022 tender from JSC NIKIMT-Atomstroy sought rolled steel for structures at facility 00UKS.

Reinforcement bar. A plant of this size consumes tens of thousands of tonnes of rebar across reactor buildings, turbine halls, cooling-water structures and site infrastructure. Here the public record is fragmentary but suggestive. Several Bangladeshi steelmakers — BSRM, DSRM, Anwar Ispat and Chakda Steel & Re-Rolling Mills (CSRM) among them — publicly list Rooppur among their landmark projects or describe supplying reinforcement steel to it. These are supplier self-descriptions rather than owner-issued contract awards, and should be treated as claims rather than confirmed procurement records. An official 2026 tender for Rooppur reinforcement works, covering supply, fabrication and installation of deformed-bar reinforcement, shows that reinforcement activity at the site was still being tendered well into the commissioning phase — a useful reminder that a nuclear project is never finished being built even after the reactor starts.

Russian-origin rolled steel. Severstal supplied 3,000 tonnes of rolled steel for Rooppur construction, according to trade-press reporting. That confirms Russian mill involvement in the structural supply chain but does not establish that Severstal fabricated or installed the finished structures.

There is a pattern worth naming. The high-specification, safety-critical steel — pressure-boundary forgings, nuclear-grade plate, containment steelwork — is overwhelmingly Russian in origin, sourced through Rosatom's own supply chain. The high-volume commodity steel — rebar, structural sections, general construction steel — appears to be substantially domestically sourced, with Bangladeshi re-rolling mills competing for it. That split is characteristic of Rosatom's export model: keep the qualification-heavy scope in-house, localise the tonnage.

For Bangladeshi steelmakers, the more interesting opportunity may lie downstream. A 2,400 MW nuclear complex needs a lifetime of maintenance, spares and, eventually, decommissioning infrastructure. It also anchors an industrial ecosystem — roads, housing, cooling-water works, transmission — that consumes ordinary steel by the thousand tonnes. The transmission connection alone, moving 1,200 MW from Pabna to the load centres around Dhaka, is a steel-intensive project in its own right.

Why this matters beyond Bangladesh

Rooppur is the first nuclear power plant in Bangladesh, but it is also a test case in a broader argument: can a Russian-designed, Russian-financed, Russian-built VVER-1200 be delivered and operated successfully in a densely populated South Asian country with no prior nuclear operating experience?

Three things make it worth watching.

First, the human factor. Bangladesh has had to build a nuclear regulator, an operating organisation and a safety culture from a standing start. BAERA's step-wise licensing — site licence, operating licence, B-2 authorisation, with further approvals still pending — is the visible scaffolding of that effort. The real test is not the licence sequence but the operating record over the first fuel cycle.

Second, the sanctions question. Rosatom is subject to varying restrictions across Western jurisdictions. Rooppur's fuel supply, spare parts, service contracts and potential lifetime extensions all depend on a supply chain that could be disrupted by sanctions policy. Bangladesh has had to weigh this against a financing package it could not have replicated commercially. The country's hedging — reported interest in diversifying nuclear partnerships and in small modular reactors — reflects the lesson.

Third, the regional precedent. For other emerging economies weighing nuclear against gas, coal and renewables, Rooppur is a live data point on cost, schedule and political durability. Its construction timeline slipped repeatedly; the value proposition looks different when the first concrete is poured in 2017 and the first kilowatt-hour reaches the grid, at the earliest, in late 2026.

What comes next

Power start-up was scheduled for 20 November 2026, with grid connection targeted by the end of that month and some officials citing possible trial supply by end December. These are targets. They are subject to the staged testing regime that criticality initiates, and they have slipped before.

Beyond Unit 1, the questions worth tracking are:

• Unit 2. Its reactor pressure vessel was installed in October 2022 and its physical construction was reported substantially complete. Commissioning the second unit will be faster because the operating organisation, procedures and regulator will already have been exercised on Unit 1 — but it will also be the first time Bangladesh runs a commissioning programme on a plant with an operating unit next door.
• Grid integration. A 1,200 MW block is large relative to Bangladesh's grid. Frequency and voltage stability, spinning reserve and transmission reinforcement in the Pabna–Dhaka corridor will determine whether the plant runs at full output or at the throttled levels common in grids unaccustomed to large single-unit nuclear capacity.
• Commercial operation and tariffs. The financial structure — Russian loan repayment against Bangladeshi electricity revenue — is where the project's economics will actually be tested, and where a generation of commentary has been speculative rather than evidenced.

The honest assessment

Rooppur Unit 1 reaching criticality is a genuine achievement. It is the culmination of a nine-year construction programme executed under difficult conditions, with a first-time owner, first-time regulator and first-time operator. That the milestone arrived at all is a credit to the people who built it.

It is also the beginning of a much harder phase. A reactor that has achieved criticality is a reactor that has proven it can run; it has not proven that it can run economically, reliably, safely for sixty years, or with fuel and spares it can secure. The steel that was poured into Rooppur is now a fixed asset. Whether it becomes an asset in the accounting sense — or a liability — depends on decisions Bangladesh has not yet had to make.

For the steel industry, the lesson is narrower but clearer. Nuclear projects are a steel opportunity that arrives in two waves: a construction wave dominated by domestic rebar and structural mills, and a fifty-year operations wave dominated by a handful of qualified suppliers. Bangladeshi steelmakers caught the first wave. The second is still unclaimed.