Robot makes foray into reactor 1
Japan Times -- Mar 20
Tokyo Electric on Sunday confirmed lethally high radiation levels inside the primary containment vessel of reactor 1 at the heavily damaged Fukushima No. 1 nuclear plant but found they were not nearly as high as those recently logged in reactor 2.

Using a camera-equipped robot on Saturday, Tepco logged 7.8 sieverts per hour on some grating inside the vessel and 1.5 sieverts per hour in water pooled at its bottom.

Those figures are far lower than the 210 sieverts per hour measured at one spot in the PVC of the No. 2 reactor last month, but they are still extremely high.

The four-day probe launched by Tepco on Saturday is aimed at locating the melted fuel rods inside the No. 1 reactor building.

The primary mission of the robot is to investigate the bottom of the containment vessel to see if it can capture images of the melted fuel. Debris is believed to have penetrated the vessel and fallen into the surrounding containment vessel as a result of the heavy damage inflicted by the March 2011 tsunami that devastated eastern Tohoku.

The pressure vessel is the main component of the reactor and contains the fuel rod assemblies. Finding the exact location and condition of the melted fuel is considered critically important to dismantling the reactors.

However, the high radiation inside poses a daunting challenge for those involved in the decommissioning work.

東京電力は、福島第一原発1号機の内部に投入した調査ロボットの画像を公開しました。 この調査は、1号機の格納容器に開けた穴からロボットを投入し、カメラをつり降ろして水没しているとみられる溶けた燃料を調べるものです。
News sources: Japan Times, ANNnewsCH
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