"is kept safely" is correct and usable in written English.
It is commonly used to describe something that is appropriately stored or protected from harm or damage. You can use it when talking about items or objects that require special care or attention. Example: The valuable paintings are kept safely in a temperature-controlled room to prevent any damage from fluctuations in humidity.
Thankfully, Workman's tongue is kept safely in his cheek, without hampering his Jeff Buckley-in-tighollerusers horler or his playful musical palate.
"This could be done just by making sure the pet is kept safely away from the letterbox, or by installing a cage inside the letterbox to reduce the risk of fingers being bitten or scratched.
FSWs struggle not only with earning a decent income, but also with ensuring that the money is kept safely away from violent perpetrators who steal it from them.
Contingency plans were in place to ensure that mail was kept safely and delays minimised.
Needless to say, I'm among "the liberals" who would prefer that Ms. Palin be kept safely distant from power.
And for good cause: They are kept in zoos and are supposed to be kept safely away from people.
They're working with corporate security from Airbus to make sure the politicians are kept safely away from the press for the entire three-day conference.
Rather than being attached to a shark's head, used to intimidate an immobilised secret agent or vaporise a rebel planet, these lasers are kept safely in the projection booth.
The NRC reckons that waste can be kept safely in dry-storage casks surrounded by inert gas for 100 years while a solution is pursued.Second, there is terrorism.
They were volunteers, poor farmers from coastal provinces like Shandong and Hebei, attracted by high pay and contracts promising (falsely) that they would be kept safely away from the fighting.
We have driven for a couple of hours from his home in Brooklyn, across two state lines, to the place where it's kept, safely enclosed in its box, at a location he prefers not to publicise, given the interest, not all of it healthy, that has been generated since his book The Lampshade: A Holocaust Detective Story was published last month.
