Shelling with what? Confirmed by what sources? Russian?
AFAIK there are even reports from seismic watchers in Norway that there was an explosion at the dam, not shelling. US satellites confirmed that with infrared sensors that detected a single explosion.
Also, according to reports from Ukraine the dam was rigged with explosives some time ago, long before the counteroffensive. This is consistent with the way Russians operate. They did the same in Zaporizhzhia power plant and almost blew it up when one of their mines exploded unintentionally near one of the buildings.

It's actually funny when you think of how Russians are bad at warfare. Digging trenches in irradiated soil of the Red Forest is probably their best achievement to date, but there were others.

One Russian soldier has reportedly been killed and another left injured after they were tricked into running into a house containing their own army's landmines by a Ukrainian prank call
https://www.mirror.co.uk/news/world-news/russian-soldiers-blown-up-mine-27872198

According to some reports, a landing craft of the Black Sea Fleet D-106 is reported to have exploded when it hit one of the Russian navy’s own mines near Mariupol, the southern Ukrainian port city that Russia’s troops destroyed and now occupy.
https://defence-blog.com/russian-landing-craft-sinks-after-hitting-sea-mine/

In a video posted on Prigozhin’s social media channels, Lt Col Roman Venevitin, the commander of Russia’s 72nd Brigade, tells an interrogator that, while drunk, he had ordered his troops to fire on a Wagner convoy.
https://www.theguardian.com/world/2023/jun/05/wagner-group-release-video-of-captured-russian-commander