Energy firm Entergy has installed a temporary cover over an opening in the reactor building at the Vermont Yankee nuclear power plant, located in Vernon, Vermont, US.

The installation of panel follows a blowout, which opened and the US Nuclear Regulatory Commission (NRC) and Entergy told Reuters that the issue did not cause any danger.

Entergy spokesman Jim Sinclair told Reuters that the panel blew out as designed when pressure slightly increased.

"It has been replaced by a panel that meets/exceeds the original design," Sinclair added.

Located about 80 miles north of Hartford, Connecticut, the Vermont Yankee station is a General Electric boiling water reactor (BWR) type nuclear power plant.

The reactor produces 1912MW of heat, which will be converted to electricity at 32% efficiency to generate the 620MW electrical output.