Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
an active reactor
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "an active reactor" is correct and usable in written English.
It can be used in contexts related to nuclear energy, chemistry, or any situation where a reactor is involved and is currently functioning or engaged in a process. Example: "The research team is studying the effects of temperature on an active reactor to improve efficiency."
✓ Grammatically correct
Science
News & Media
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
1 human-written examples
"This was an active reactor.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
56 human-written examples
An important aspect in assessing the performance of a catalytically active reactor is the accessibility of the reactive sites inside the individual pellets, and the mass transfer of reactants and products to and from these sites.
It is displayed to the user and includes a live video stream from the active reactor(s).
Science
Entergy also owns Indian Point 3, the other active reactor at the site, and completed a similar refueling process there in 27 days in 2001, compared with 41 days in 1999 under the previous owner, the New York Power Authority.
News & Media
And yet until the shutdown of the last active reactor at Chernobyl in 2001, staff still worked there, commuting directly from Slavutych train station.
News & Media
Fourteen years after the worst accident in the history of nuclear power, Ukraine seems determined to shut down the lone active reactor remaining at Chernobyl by the end of the year.
News & Media
This information includes a plain-text description of the current unit operation, the system status, the amount of time remaining for timed steps, and live video from the active reactor(s).
Science
Last month Entergy announced that it would merge the two security forces at the plant, a legacy from a time when different owners operated the two active reactors.
News & Media
The two camps have debated how or if Indian Point's two active reactors, whose 2,000 megawatts are a major source of power to New York City and its northern suburbs, could be replaced.
News & Media
Jim Steets, a spokesman for Entergy, which operates the two active reactors at the site in Buchanan, N.Y., 35 miles north of Midtown Manhattan, said that even though there was no public safety threat, officials chose to divulge the problem because of heightened concern about the plants.
News & Media
The river is not used for drinking water either, they say, and they point out that the amount from the leak is a tiny increment compared with what the two active reactors at the site can legally release, and naturally occurring tritium.
News & Media
Expert writing Tips
Best practice
When referring to a reactor, ensure that "an active reactor" is paired with specific metrics or descriptions of its activity (e.g. "an active reactor producing plutonium").
Common error
Avoid using "an active reactor" without specifying the context of its activity. Clearly state the type of reaction or process occurring within the reactor.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "an active reactor" functions as a noun phrase, where "active" modifies the noun "reactor". Ludwig AI indicates its correctness in English.
Frequent in
News & Media
33%
Science
33%
Formal & Business
0%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "an active reactor" is a grammatically correct phrase used to describe a reactor currently in operation. While Ludwig AI confirms its validity, its usage is relatively rare. You'll primarily find it in news and scientific contexts. When using the phrase, ensure clarity by specifying the type of activity occurring within the reactor. Alternatives like "a functioning reactor" or "an operating reactor" can be used interchangeably depending on the specific nuance you want to convey.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a functioning reactor
Emphasizes the reactor's ability to perform its intended function.
an operating reactor
Highlights the reactor's current operational status.
a live reactor
Conveys that the reactor is currently running or 'alive' with activity.
a working reactor
Simple and direct alternative, indicating the reactor is in working order.
a running reactor
Focuses on the reactor's ongoing operation.
an energized reactor
Suggests the reactor is powered and ready for operation.
a reactor in operation
Rephrases to emphasize the state of being operational.
a reactor that is active
Adds a bit of redundancy while maintaining the same meaning.
an activated reactor
Highlights the transition from inactive to active status.
a reactor undergoing operation
Emphasizes the process of the reactor's activity.
FAQs
How can I use "an active reactor" in a sentence?
You can use "an active reactor" to describe a reactor that is currently in operation, such as, "The scientists monitored "an active reactor" during the experiment".
What are some alternatives to "an active reactor"?
Some alternatives to "an active reactor" include "a functioning reactor", "an operating reactor", or "a live reactor", depending on the specific context.
Is it correct to say "a active reactor" instead of "an active reactor"?
No, it is incorrect. The correct phrasing is "an active reactor" because "active" begins with a vowel sound, and the article "an" is used before vowel sounds.
In what contexts might I encounter the term "an active reactor"?
You're most likely to encounter the term "an active reactor" in contexts related to nuclear energy, chemical engineering, or scientific research involving reactors.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested