The central bank bought treasuries from eight lenders and will sell them back June 4.
The amount represents a new record since February 2010, when the central bank pumped RON9.24 billion into the market in a similar operation.
Last week, the central bank lent RON7.94 billion to nine lenders in a one-week repo.
On the money market Monday, weekly rates were at 4.8%-5.3% a year, little changed on the day. (EUR1=RON4.4641)