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Problems for units 3 and 4

Located in: Regulation and Safety

16 March 2011

Chief cabinet secretary Yukio Edano has described problems that occurred on the morning of 16 March with Fukushima Daiichi 3 and 4, as well as plans to pump water into unit 4. Controlling the situation of the used fuel storage ponds is the urgent priority now.

All Fukushima Daini units in cold shutdown

Located in: Industry Talk

15 March 2011

All four units at the Fukushima Daini nuclear power plant have now achieved cold shutdown - where coolant water is at less than 100ºC - with full operation of cooling systems, Tepco reported. All the reactors shut down automatically during last week’s earthquake and have remained safe. While unit 3’s shutdown went as expected, damage to the emergency core cooling systems of units 1, 2 and 4 led to the announcement of emergency status. These three reactors were prepared for potential pressure release, but this was never required. Unit 1 announced cold shutdown at 1.24 am on 14 March and unit 2 followed at 3.52 am. Tepco has now announced that unit 4 achieved cold shutdown at 7.15 pm on 15 March. Water levels are now stable in all four reactors and offsite power is available, the company said.

Radiation decreasing, fuel ponds warming

Located in: Regulation and Safety

15 March 2011

BWR cutawayLoud noises were heard at Fukushima Daiichi 2 this morning and a major component beneath the reactor may be damaged. Evacuation to 20 kilometres is being completed, while radiation levels decrease from a high in the morning. Concern is growing over the status of fuel cooling ponds at units 4, 5 and 6.

Loss of coolant at Fukushima Daiichi 2

Located in: Regulation and Safety

14 March 2011

Serious damage to the reactor core of Fukushima Daiichi 2 seems likely after coolant was apparently lost for a period. Seawater is again being injected, but coolant level is unknown.

Rolling blackouts as Japanese efforts continue

Located in: Regulation and Safety

14 March 2011

Japanese utilities are introducing rolling blackouts in the face of energy shortages following the natural disasters of the last few days. Meanwhile, the country is relying more than ever on the continued operation of its other nuclear reactors.

Cold shutdowns at Fukushima Daini

Located in: Regulation and Safety

14 March 2011

Two more reactors at Fukushima Daini have now achieved cold shutdown with full operation of cooling systems. Engineers are working for the same at the last unit.

Second explosion rocks Fukushima Daiichi

Located in: Regulation and Safety

14 March 2011

Another hydrogen explosion has rocked the Fukushima Daiichi nuclear power plant, this time at the third reactor unit. Initial analysis is that the containment structure remains intact.

Contamination checks on evacuated residents

Located in: Regulation and Safety

13 March 2011

Potential contamination of the public is being studied by Japanese authorities as over 170,000 residents are evacuated from within 20 kilometres of Fukushima Daini and Daiichi nuclear power plants. Nine people's results have shown some degree of contamination.

Efforts to manage Fukushima Daiichi 3

Located in: Regulation and Safety

13 March 2011

Operations to relieve pressure in the containment of Fukushima Daiichi 3 have taken place after the failure of a core coolant system. Seawater is being injected to make certain of core cooling. Malfunctions have hampered efforts but there are strong indications of stability.

Battle to stabilise earthquake reactors

Located in: Regulation and Safety

12 March 2011

BWR cutaway

Attention remains focused on the Fukushima Daiichi and Daini nuclear power plants as Japan struggles to cope in the aftermath of its worst earthquake in recorded history. A dramatic explosion did not damage containment and sea water injection continues through the night.


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