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Highest radiation reading since 3/11 detected at Fukushima No. 1 reactor

The Japan Times

The radiation level in the containment vessel of reactor 2 at the crippled Fukushima No. 1 power plant has reached a maximum of 530 sieverts per hour, the highest since the triple core meltdown in March 2011, Tokyo Electric Power Co. Holdings Inc. said. Tepco said on Thursday that the blazing radiation reading was taken near the entrance to the space just below the pressure vessel, which contains the reactor core. The high figure indicates that some of the melted fuel that escaped the pressure vessel is nearby. At 530 sieverts, a person could die from even brief exposure, highlighting the difficulties ahead as the government and Tepco grope their way toward dismantling all three reactors crippled by the March 2011 disaster. Tepco also announced that, based on its analysis of images taken by a remote-controlled camera, that there is a 2-meter hole in the metal grating under the pressure vessel in the reactor's primary containment vessel.


Tepco finds gaping hole in grate under containment vessel, potential fuel debris at Fukushima No. 1 power plant

The Japan Times

The radiation level in the containment vessel of the No. 2 reactor at the defunct Fukushima No. 1 power plant has reached a maximum of 530 sieverts per hour, the highest since the triple core meltdown in March 2011, operator Tokyo Electric said Thursday. Tokyo Electric Power Company Holdings Inc. also announced that, based on image analysis, it has discovered a 2-meter hole in the metal grating beneath the pressure vessel inside the No. 2 unit's containment vessel, and detected that a portion of it is warped. According to Tepco, the blazing radiation reading was taken near the entrance area in the space just below the pressure vessel, which contains the reactor core. The previously high was 73 sieverts per hour. The hole could have been caused by melted fuel penetrating the vessel after a mega-quake and massive tsunami triggered a station blackout that crippled the plant's ability to keep the reactors cool on March 11, 2011.


Fukushima radiation levels hit record high

Daily Mail - Science & tech

Radiation levels inside a stricken reactor at Japan's Fukushima nuclear plant have hit a record high. Levels are now so high that they could kill off robots sent in to probe the reactors. The development casts doubt over how the disaster-hit facility will be safely dismantled in the future. Radiation levels inside a stricken reactor at Japan's Fukushima nuclear plant have hit a record high. Levels are so high that they could kill off robots sent in to probe the reactors.


High radiation readings complicate Fukushima robot strategy at unit 2

The Japan Times

The high radiation estimates in the No. 2 reactor of the stricken Fukushima No. 1 nuclear plant will probably force a rethink of the nationalized utility's robot-based strategy for locating its molten fuel. According to an analysis of Thursday's abbreviated probe, the radiation in the primary containment vessel is about 650 sieverts per hour, more than the 530 sieverts estimated late last month, Tokyo Electric Power Company Holding Inc. said. That level could kill a person quickly and indicates the fuel likely burned through the pressure vessel during the meltdown and is somewhere nearby. Tepco, as the utility is known, halted Thursday's robot after its camera went dark. The company suspects the problem was caused by the radiation.


Robot probe finds lethal 11 sieverts in water near bottom of Fukushima reactor 1 vessel

The Japan Times

FUKUSHIMA – A radiation level of 11 sieverts per hour has been detected in tainted water inside a reactor containment vessel at the Fukushima No. 1 nuclear power plant, Tokyo Electric Power Company Holdings Inc. said Tuesday. The reading was measured in a survey using a robot on Sunday at a point some 30 cm above the bottom of the containment vessel of the plant's reactor 1. This is the highest radiation level detected in water inside the containment vessel. If exposed to this level of radiation, a person likely would die in about 40 minutes. The survey showed accumulation of sandy substances at the bottom, but Tepco said it does not believe they are melted nuclear fuel.