ol them down and reduce pressure inside reactor container vessels.
01:43 - Japan Atomic Power says the cooling process was working at its Tokai No.2 nuclear power plant's reactor although two of the three diesel power generators used for cooling were out of order. The reactor at the plant, about 120 km (75 miles) north of Tokyo in Ibaraki prefecture, was automatically shut after Friday's massive earthquake and tsunami.
07:29 - TEPCO says it has reported a rise in radiation levels at its Fukushima Daiichi nuclear power plant to the government.
11:11 - Domestic media image shows smoke rising from the No.3 reactor at Japan's Fukushima Daiichi nuclear plant. Japanese TV says there was a hydrogen explosion at the plant.
11:20 - Japan's nuclear safety agency confirms a new explosion rocked Japan's stricken Fukushima Daiichi nuclear power complex, sending a plume of smoke into the air. But it says it cannot confirm whether or not the hydrogen explosion at the plant's No.3 reactor has led to an uncontrolled leak of radioactivity.
11:40 - Jiji quotes TEPCO as saying a fresh explosion that rocked the Fukushima Daiichi nuclear power complex has not damaged the plant's No.3 reactor vessel.
12:43 - Chief Cabinet Secretary Yukio Edano says a large-scale radiation leakage is unlikely from the Fukushima Daiichi nuclear power plant's No. 3 reactor hit by an explosion after cooling problems.
15:17 - Jiji news agency reports that there has been an explosion at a fuel oil tank at a thermal power plant in Fukushima and that the tank is on fire. It is not immediately clear which company the thermal power plant belonged to.
15:26 - The IAEA says Japan has told the U.N. nuclear watchdog the hydrogen explosion at the No.3 reactor at the Fukushima Daiichi nuclear plan did not damage the primary containment vessel.
16:17 - Chief Cabinet Secretary Yukio Edano confirms water levels at the Fukushima Daiichi plant No.2 reactor are falling and its cooling functions have stopped.
17:23 - Jiji news agency says Japanese authorities have safely cooled down two nuclear reactors at the Fukushima Daini nuclear plant, close to another nuclear complex where they are still struggling to cool three overheating reactors.
19:52 - Jiji quotes TEPCO as saying nuclear fuel rods at the Fukushima Daiichi complex's No.2 reactor, where levels of water coolant around the reactor core had been reported as falling earlier in the day, are now fully exposed. Jiji says a meltdown of the fuel rods cannot be ruled out.
20:10 - Water levels inside the Fukushima Daiichi complex's No.2 reactor are almost empty, TEPCO says. Jiji news agency says the operator of the plant has started injecting sea water to the reactor in the hope of cooling it down. (Compiled by Mark Bendeich; Editing by Daniel Magnowski)