The devastating March 11 earthquake didn't cause any loss of cooling water at the Fukushima Daiichi nuclear power plant, the plant operator said Monday, denying the temblor was responsible for a nuclear fuel meltdown at the plant's No. 1 reactor, Kyodo News reported.

Tokyo Electric Power Co. (9501.TO) said it will submit a report to the government, attributing the meltdown to the tsunami that followed the quake, and make it public on Tuesday.

It had been suspected that the No. 1 reactor core suffered a meltdown shortly after the plant was rattled by the earthquake.