In this Oct. 2, 2019, file photo, cooling towers release heat generated by boiling water reactors at Xcel Energy’s Nuclear Generating Plant in Monticello, Minn. Credit: Evan Frost/Minnesota Public Radio / AP

A Minnesota nuclear plant where 400,000 gallons of radioactive water leaked last year is temporarily shutting down after discovering a smaller leak this week.

Xcel Energy said it will begin powering down its plant in Monticello on Friday to expedite repairs needed to permanently resolve a leak of tritium-contaminated water. The length of the shutdown has not yet been determined but should not impact customers’ electric service, the Minneapolis-based utility company said.

Xcel Energy and state agencies publicly announced last week the initial leak of roughly 400,000 gallons of water containing tritium — a byproduct of the production of electricity by nuclear power plants that emits low levels of radiation.

The initial leak was detected in late November through routine groundwater monitoring systems and occurred in a water pipe that runs between two buildings at the plant, which is located along the Mississippi River about […]

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