Kyodo, Feb 2, 2017 (emphasis added): Radiation level at Fukushima reactor highest since 2011 disaster — The radiation level inside the containment vessel of the No. 2 reactor at the crippled Fukushima Daiichi nuclear complex stood at 530 sieverts per hour at a maximum, the highest since the 2011 disaster, the plant operator said Thursday… The previously highest radiation level monitored in the interior of the reactor was 73 sieverts per hour.
Kyodo, Feb 2, 2017: Record radiation level detected inside damaged Fukushima reactor… The reading means 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 that melted down…
Nikkei, Feb 3, 2017: Based on the “noise” in the images, the utility estimated that one area of the containment vessel was emitting radiation at a level of 530 sieverts per hour… Tepco previously believed that most of the reactor’s nuclear fuel had been contained in the pressure vessel, based on last year’s muon tomography inspection… But “it’s highly possible that melted fuel leaked through,” said Yuichi Okamura, a company spokesman for nuclear power.
Source: “Unimaginable”: Record high radiation levels at Fukushima plant — “Gaping hole” found under containment vessel — Officials now admit: “It’s highly possible melted fuel leaked through” — Concern over radioactive gas leaks (PICS & VIDEO) « ENENews.com – Energy News