Can nuclear fission be controlled in the laboratory?
I think yes, also because I think the first nuclear fission was performed in a laboratory.
If I remember correctly the first fission was performed in a laboratory of Chicago University in 1942.
[The first nuclear reactor was erected in 1942 in the West Stands section of Stagg Field at the University of Chicago. On December 2, 1942 a group of scientists achieved the first self-sustaining chain reaction and thereby initiated the controlled release of nuclear energy]