I have studied about nuclear reactors and also know their functionality.But some how i couldn't get answers for some my questions.
1) During fission reaction enormous amount of heat is produced and this heat is in the form of flames?
2)If so does the whole reactor core is burnt?and how come water can be in contact with the burning core?
3)Once a fission process is finished will reactor be ready for next usage or it will left for years for less radioactive?
4) Whether the chain reaction is started by introducing neutrons or done automatically by spontaneous emission of fuel rods?
5)If it is due to neutron introduction then how these neutrons attack the pellets containing uranium correctly and how many tries are required?
I have searched for many sources online but couldn't get a clear image.Hope get now.