The Institute of Nuclear Power Operations (INPO) based in Atlanta, Georgia has issued the report on the early days of Fukushima I Nuclear Power Plant accident with overview and timeline of the accident.
The 104-page document is available here: http://cryptome.org/0005/daiichi-inpo.pdf
From the introduction:
This report provides a narrative overview and timeline for the earthquake, tsunami, and subsequent nuclear accident at Tokyo Electric Power Company’s (TEPCO) Fukushima Daiichi Nuclear Power Station on March 11, 2011. The purpose of this report is to provide an accurate, consolidated source of information regarding the sequence of events that occurred in the first days of the accident. The information contained in this report may be used for determining future U.S. and international industry corrective actions.
... This report reflects the best available information, most of which was obtained from direct and ongoing interaction with TEPCO. ...
I haven't read it myself but feel free to report on it or any segment of it in the comment section.