Another very informative (free) report is available here:
[link to fukushima.ans.org]

Full report:
[link to fukushima.ans.org]

Appendices and FAQs:
Appendix A - Frequently Asked Questions: Section II, “Accident Analysis”.pdf
Appendix B - Frequently Asked Questions: Section III, “Health Physics”.pdf
Appendix C - Accident Cleanup
Appendix D - Frequently Asked Questions: Safety Issues and Recommendations
Appendix E - Comparison of the Earthquake and Tsunami to Design Basis in Japan
Appendix F - Safety System Descriptions for Station Blackout Mitigation: Isolation Condenser, Reactor Core Isolation Cooling, and High-Pressure Coolant Injection
Appendix G - Status of Spent Fuel in the Unit 1 Through 6 and Common Spent- Fuel Pools at the Fukushima Daiichi Nuclear Power Station
Appendix H - Accident Timeline
[link to fukushima.ans.org]
.