A leak of steam from a pipe has been found at a reactor at the Takahama nuclear power plant facing the Sea of Japan, as well as increased amounts of leaking cooling water at another spot. The operator says there were no radiation leaks, and is reducing power output to determine the causes.

Kansai Electric Power Company says steam was found leaking from the pipe at the No.1 reactor of the Takahama plant in Fukui Prefecture on Sunday night. The pipe connects to a pump that sends cooling water to power generation equipment.

A worker carrying out inspections at the turbine building of the reactor found the leak and stopped the pump.

The operator also says that, at another pump, workers found the leaking of more cooling water than usual on Monday morning.

The utility reduced power output to 40 percent to carry out inspections of the two pumps, as stopping them reduces the supply of cooling water. Another pump remains active.

The operator says there were no radiation leaks, and nobody was injured.

Fukui Prefecture also says there were no changes in the measurements at radiation monitoring posts in areas surrounding the plant.

This year marks 50 years since the reactor started operation. It is the oldest operable nuclear reactor in Japan. It went back online last year for the first time in over 12 years.