Sixty-one Plant Vogtle workers didn’t complete a federally mandated test.

That’s according to a report submitted to the nuclear Regulatory Commission. The test was supposed to have been given after training.

A spokesperson for Shaw Group, the site’s main contractor, says the employees can’t go everywhere on the site until they take the test.

Officials say it was an oversight and won’t delay the construction of the first new nuclear reactors in the U.S. in decades.

The problem comes less than 3 months after some site employees failed to complete a written survey detailing use of drugs and alcohol.

Tags: Augusta, Nuclear Regulatory Commission, Plant Vogtle, Shaw Group