Russia's RIA Novosti news agency also reported that there were no casualties following Friday's incident, while the fire had been put out.
Russia's RIA Novosti news agency also reported that there were no casualties following Friday's incident, while the fire had been put out.
It was not immediately clear who was behind the incident. Ukrainian officials do not usually claim responsibility for such attacks inside Russia's territory, although they sometimes celebrate them using euphemistic language.
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A source at refinery told Reuters that an aerial cooler at the CDU-5 column, which has an annual capacity is 1.8 million tonnes, was hit. Another primary unit at the plant has capacity of 3.6 million tonnes per year.
That cooler could be replaced within a couple of weeks, though the impact is yet to be fully accessed, the source added.
The press service at the plant was not immediately available for comments.
