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In page Timeline of the Fukushima nuclear accident:

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At approximately 14:30 TEPCO announces its belief that the fuel rod storage pool of unit 4 – which is located outside the containment area – may have begun boiling.[1] By midday NHK TV is reporting white smoke rising from the Fukushima I plant, which officials suggest is likely coming from reactor 3. Shortly afterwards all but a small group[2] of remaining workers at the plant are placed on standby because of the radiation rising to a dangerous level of up to 1 Sv/h.[citation needed] TEPCO temporarily suspended operations at the facility.[3] A TEPCO press release states that workers had been withdrawn at 06:00 because of abnormal noises coming from one of the reactor pressure suppression chambers.[4] Late in the evening Reuters reports that water is being poured into reactors 5 and 6.[5]