The malfunction at the Kalinin plant northwest of Moscow is the second incident linked to Russia's nuclear grid in a week.
The state's emergency management administrator said the well field "is as safe as we can get."
The Japanese government mandates a limit of 40 years for nuclear reactors; the Tokai No. 2 has been running since 1978. Today marked the fourth time Japan Atomic Power Co. filed an application with the Nuclear Regulation Authority for an extension.
Standards, guidelines and exercises have bolstered the security of high-voltage networks but little has been done to protect the low-voltage systems that power our homes and workplaces.
Cybersecurity lapses have left critical Ukrainian infrastructure like a "powder keg", security researchers have said.
The case arose from the EPA's efforts to regulate pollution.
Energy minister says the problem should be resolved by Friday.
"The power plant is finished," said its director, as the Israeli assault intensified, detroying a Hamas leader's house and killing at least 30 Palestinians