The Vermont Yankee nuclear power plant in Vernon is delaying until Wednesday the test of 37 emergency sirens in three states.
The test of the sirens had been planned for today.
The sirens are in the Vermont, New Hampshire and Massachusetts towns surrounding the plant, including 16 sirens recently added to the system.
Residents in the area are sent emergency planning materials once a year that advise them to tune to specific radio stations for further instruction when hearing the sirens.
The sirens will generally sound for three minutes sometime between 10 a.m. and 4 p.m. Extra testing will be conducted in Chesterfield, N.H., to check the loudness of recently installed sirens.