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The BWRX-300 is a boiling-water small modular reactor designed by GE Vernova Hitachi, with a rated output of about 300 megawatts-electric (MWe). Its reactor produces about 870 megawatts-thermal (MWth) of heat; those numbers describe different stages of power production, not conflicting estimates. The reactor pressure vessel is specified as 4 metres wide internally and 27 metres high internally, but those are vessel dimensions—not the dimensions of the full plant or site. The design uses natural circulation and passive cooling systems. Its manufacturer says it is designed to remain in a safe state for seven days after a station blackout without power or operator action; that is a design claim, not a record of demonstrated operation.
What is the BWRX-300?
The BWRX-300 is GE Vernova Hitachi’s boiling-water reactor design in the small modular reactor (SMR) category. In a boiling-water reactor, water inside the reactor vessel serves as coolant and boils to make steam. That steam is used to produce electricity. The U.S. Nuclear Regulatory Commission (NRC) describes the BWRX-300 as water-cooled and based on natural circulation.
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The “300” refers to the reactor’s approximate net electrical output: about 300 MWe. It is a design name, not a claim that the reactor produces 300 megawatts of heat. The distinction matters because the heat made by the reactor is converted into a smaller amount of electrical output. The UK Office for Nuclear Regulation (ONR) gives the design figures as approximately 870 MWth and 300 MWe.
These figures describe the design, not electricity currently being delivered by an operating BWRX-300. A stated capacity is not the same as measured output over time, and the sources cited here do not provide operating data for the design.
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How large is the reactor?
GE Vernova Hitachi’s General Description, Revision J, lists the reactor pressure vessel’s internal diameter as 4 metres and its internal height as 27 metres. Those measurements apply to the vessel that contains the reactor’s core and coolant. They do not describe the full power plant, its buildings, the site boundary or the land needed for a project.
That distinction is important whenever a reactor’s size is summarized in a headline or comparison. A pressure vessel is one component of a nuclear generating station. Plant-wide dimensions depend on other structures and systems, and site requirements depend on project-specific factors not established by the vessel measurements. The figures should therefore be read as a description of a major reactor component, not as a footprint estimate.
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The same Revision J comparison table lists 240 fuel bundles and 57 control rods. Fuel bundles contain the reactor fuel; control rods are part of the system used to control the nuclear reaction. These counts add detail about the vessel and core configuration, but they do not by themselves provide a complete picture of the reactor’s layout or performance.
The published specifications are useful for understanding the scale of the reactor assembly. They are not construction drawings or a substitute for a project’s site plans, and the sources cited here do not establish the dimensions of a complete BWRX-300 facility.
What do 300 MWe and 870 MWth mean?
MWth measures thermal power—the rate at which the reactor produces heat. MWe measures electrical power. The BWRX-300’s approximately 870 MWth is the reactor’s heat output; approximately 300 MWe is its net electrical generating capacity, according to the ONR assessment.
In simplified terms, the reactor heats water until it boils and produces steam, and the steam drives equipment that generates electricity. Some of the heat does not become electricity, so the thermal figure is higher than the electrical figure. Comparing a reactor’s MWth directly with a power station’s MWe would mix unlike measurements. For a meaningful capacity comparison, use electrical output against electrical output, and keep thermal output separate.
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The figures are approximate design ratings. They do not mean the plant would produce exactly 300 megawatts of electricity at every moment, nor do they tell a reader how much electricity it would generate over a year. Annual generation depends on operating conditions and time online; no BWRX-300 operating statistics are provided by the sources cited here.
How does the BWRX-300’s cooling system work?
The design uses natural circulation: coolant moves through the reactor because of differences in temperature and density, rather than relying entirely on powered circulation pumps. As water in the vessel is heated and boils, the changing conditions support circulation. The NRC and ONR identify natural circulation as a BWRX-300 design characteristic.
Natural circulation is a way of moving coolant; it is not the same thing as a complete safety system. The design description also lists passive safety features, including emergency core cooling, isolation makeup and primary containment vessel cooling. Those are distinct functions, and describing them as passive does not mean that the plant has only one cooling mechanism or that all safety questions are answered by a single feature.
The manufacturer also identifies passive isolation condenser systems. In the vendor’s description, steam enters an isolation condenser, where it loses heat and condenses. Water then returns to the reactor by gravity. This arrangement is intended to remove heat without depending on powered circulation in the same way as a pump-driven system.
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What does the seven-day safety claim mean?
GE Vernova Hitachi says the BWRX-300 is designed to remain in a safe state for seven days after a station blackout, without electrical power or operator action. The vendor’s account describes isolation condensers removing heat, with gravity returning condensed water to the reactor. It also says that continued cooling after that period depends on adding water to the isolation condenser pools.
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Read “seven days” as a manufacturer’s design claim under the stated station-blackout conditions—not as an observed operating result, a guarantee that every accident scenario is covered, or proof that the plant needs no emergency planning. The sources cited here do not establish that a BWRX-300 has demonstrated seven days of operation in those conditions. No independent operating statistics for the design were identified in the cited research.
“Without operator action” also applies to the vendor’s stated period and scenario. It does not mean that operators have no responsibilities during normal operation, that no response is needed after the period, or that the plant can continue cooling indefinitely without replenishment. According to the vendor, continued cooling requires water addition to the condenser pools. That qualification is essential to understanding the claim.
More broadly, passive safety describes how certain systems are intended to function—for example, using gravity or natural circulation—rather than proving a reactor safe solely by virtue of the label. Safety conclusions depend on the design’s full set of systems and structures and on regulatory assessment. The General Description’s list of passive emergency core cooling, passive isolation makeup and passive primary containment vessel cooling illustrates why the design should not be reduced to its isolation condensers alone.
What is the BWRX-300’s regulatory status?
Regulatory progress is jurisdiction-specific. A review milestone in one country does not amount to approval everywhere, and a design assessment or construction-related milestone is not the same as commercial operation.
In the United States, the NRC’s BWRX-300 page describes pre-application engagement, including review of selected licensing topical reports and technical white papers. Pre-application work is part of the regulatory process; it should not be described as a blanket approval to build or operate a reactor.
In the United Kingdom, the government’s public summary concerns the Generic Design Assessment (GDA) process. The ONR assessment report provides technical information about the design, including its approximate electrical and thermal ratings. A GDA assessment is a UK process and should not be merged with the NRC’s U.S. activities or with Canadian licensing steps.
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The UK summary also refers to Canadian licensing progress. Each country has its own regulator, procedures and project milestones. For a current project decision, readers should check the regulator and project records for the relevant country and date; the sources cited here do not support a claim that the BWRX-300 is approved in every jurisdiction or commercially operating.
How should you read BWRX-300 specifications?
Start by identifying what each number measures and who published it. The ONR’s approximately 300 MWe and 870 MWth figures are useful for separating electrical capacity from reactor heat output. GE Vernova Hitachi’s Revision J gives vessel and core-related design details. The vendor’s fact sheet states the seven-day blackout claim, which should remain clearly attributed to the manufacturer.
For size, check whether a figure refers to the reactor pressure vessel, the plant buildings or an entire site. For output, distinguish heat from electricity. For safety, separate the existence of a design feature from evidence that the feature has been demonstrated under operating conditions. For licensing, name the jurisdiction and the specific milestone rather than saying simply that the design is “approved.”
These distinctions also help when comparing the BWRX-300 with another reactor. Use matching measures: net electrical output against net electrical output, vessel dimensions against vessel dimensions, and comparable licensing stages. Identify the reactor type and coolant-circulation approach, and state whether a safety or performance figure is a design claim or supported by operating experience. Otherwise, a comparison can look precise while combining figures that do not mean the same thing.
What the available figures do—and do not—establish
The available primary sources support a concise technical picture: a water-cooled boiling-water SMR design, approximately 300 MWe net electrical output, approximately 870 MWth thermal output, natural circulation, passive cooling features, and specified internal dimensions for the reactor pressure vessel. The design description also lists 240 fuel bundles and 57 control rods.
They do not establish the full site footprint, actual annual electricity generation, commercial operating performance or a universal regulatory approval. Nor should the seven-day vendor claim be presented as a demonstrated result. Keeping those limits visible makes the specifications more useful: readers can understand what the design claims while distinguishing those claims from plant-wide data and operating evidence.
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Sources: GE Vernova Hitachi’s BWRX-300 design overview; the ONR BWRX-300 GDA Step 2 assessment report; GE Vernova Hitachi’s General Description, Revision J; the NRC BWRX-300 pre-application page; the UK government’s GDA Step 2 public summary; and the manufacturer’s June 2025 fact sheet.
Frequently Asked Questions
Does the BWRX-300 use fuel bundles?
Yes. GE Vernova Hitachi’s General Description, Revision J, lists 240 fuel bundles. That count describes the design configuration; it is not a measure of fuel consumption or operating duration.
How much electricity would 300 MWe provide to homes?
The MWe rating alone cannot yield a reliable household count. That calculation would also need assumptions about electricity use, how much of the plant’s capacity is available over time, and the relevant grid and location.
Is the BWRX-300 already producing electricity commercially?
The cited regulator and government sources describe review and licensing processes, not commercial operating output. The source material used here does not identify independent operating statistics for a BWRX-300.
Does “small modular reactor” mean the whole facility is small enough for any site?
No. “Small modular reactor” identifies a reactor category and design approach, not a universal site-size guarantee. Project suitability depends on the complete facility and site-specific requirements, which are not established by reactor-vessel dimensions.
