The aim of this thread is to compile links to basic reference materials relevant to nuclear power plant accidents. I have compiled this from Fukushima threads and some googling. If you have anything more, please add below.
General information on nuclear energy
The nuclear energy option
Radiation units, doses and effects
Quantities and units of ionizing radiation
rem/Sievert and rad/Gray conversion tables
Some useful calculators
Effects of radiation on humans
Effects of nuclear explosions - read section 5.6.3 Radiation Injury.
Wikipedia article on radiation poisoning
Understanding nuclear contamination
A booklet from Lake County (Ohio) Emergency Management Agency (PDF) including reactor fallout protection and evacuation checklists (page 3-4)
Difference between nuclear weapon fallout and reactor accident fallout.
Nuclear war survival skills including a chapter on Trans-pacific fallout and a do-it-yourself radiation meter.
The effects of nuclear weapons includes a comprehensive chapter on weapon fallout (PDF)
You will survive doomsday: concise nuclear war survival guide
International Nuclear Events Scale
Descritpion from IAEA as PDF
What happened, how, and why (wikipedia)
Health consequences of Chernobyl disaster
Post-Chernobyl thyroid cancer rates in Belarus
Fallout distribution over Europe
Disaster area exclusion zones
Exclusion zones superimposed over map of Japan
Exclusion zones superimposed over map of California (PDF)