Federal regulators are getting more specific about upgrades for dozens of nuclear power plants including one in our region.

The Nuclear Regulatory Commission has ordered 31 power plants to upgrade ventilation systems for their reactors.

The Limerick Generating Station in Montgomery County is one of those plants.

The upgrades are meant to prevent hydrogen explosions like those that damaged the Fukushima Daiichi power plant in Japan two years ago.

The 31 plants, including Limerick, have reactors similar to Fukushima's.

Limerick is expected to complete the upgrades over the next six years.