Hanford workers were being sent home early Wednesday because of a weather forecast for heavy snow and decreased visibility.
Only essential workers were to remain on the nuclear reservation.
To help with traffic congestion, some workers were being sent home at 1:30 p.m. and others were being sent home at 2:15 p.m.
The Wednesday swing shift has been canceled.
Energy Northwest workers were sent home at 2:30 p.m. Those essential to operating the nuclear plant remained at work.
Workers at Pacific Northwest National Laboratory in Richland went home at 1 p.m.