Governor of the U.S. state of Washington said on Friday that underground tanks at a nuclear reservation in the state are leaking.

Washington Governor Jay Inslee told reporters that a total of six underground tanks at Hanford nuclear reservation are leaking and he was told there is no immediate safety threat from the leaks, according to reports from The Seattle Times.

Inslee will be in Washington D.C. this weekend for a meeting with U.S. Energy Secretary Steven Chu.

The Hanford site, a decommissioned nuclear production complex in south-central Washington, was home to the first full-scale plutonium production reactor in the world. Plutonium manufactured at the site was used in the first nuclear bomb and the bomb detonated over Nagasaki, Japan.

Today, nuclear waste is stored in 177 underground tanks in Hanford, representing two-thirds of high-level nuclear waste in the United States. The complex has been the focus of the nation's largest environmental cleanup for years.

Last Friday, it was announced that a single-shell tank at Hanford was leaking up to 300 gallons a year of radioactive liquids, raising concerns about the integrity of other underground tanks.