Former Japanese Prime Minister Naoto KAN explains exactly what was happening right after the Fukushima Dai-ichi explosion: there are 3 reasons for the wrong information reached the PM; 1) genuine hardware problem causing the inaccurate reading, 2) TEPCO HQ failed to gather correct information from the site, and 3) TEPCO HQ deliberately does hide inconvenient truth, still refusing to disclose the critical information. Mr Kan was ousted from his post because he changed his mind about nuclear power policy - he'd finally learnt the ugly reality of TEPCO's operation.
via Harusai-san's blog