However, Naoto Sekimura, a professor at Tokyo University, insisted there was little chance that Japan came close to experiencing a Chernobyl-style meltdown. "No Chernobyl is possible at a light water reactor," he said. "Loss of coolant means a temperature rise, but it also will stop the reaction. Even in the worst-case scenario, that would mean some radioactive leakage and equipment damage, but not an explosion.