These pumps provide water into the reactor vessel, while the water is heated during the fission process, converted to steam and piped to the turbine to spin it and produce power.
The plant officials have discovered a problem with the electrical power for the system that monitors the flow.
Initially, troubleshooting indicated that there was no problem with the flow of water.
The US Nuclear Regulatory Commission (NRC) said that the plant’s senior resident inspector is working with plant staff to examine the issue.
"At this point, the plant is in a safe condition, and it appears the operators have taken appropriate actions in response to the problem. The shutdown has been uncomplicated," the NRC said.
"The plant systems performed as designed."
