Luckily, nuclear rectors are too large to be ran over by a tow truck. However, if one did get ran over by a tow truck, nothing would happen. The containment vessel is enormously strong, and the outer structure is even stronger, so no meltdown would happen.
The world would be very different
Catholicism
This part is the core of the nuclear reactor containing the nuclear fuel.
the nuclear reactor exploded
If the control rods in a nuclear reactor were somehow to be instantly "jerked" out of the reactor, the reactor would go supercritical. If they were pulled at a normal rate and all of the control rods were pulled out, the reactor would start up and heat up and would end up running far too hot. Any one of several safety systems would shut the reactor down before this could happen. If the safety systems were disabled, the reactor would overheat and a meltdown may occur.
By "nuclear leaks" is meant the leakage of radioactive material from a nuclear facility such as a nuclear reactor or a store of spent fuel. This would only happen if the fuel had been damaged and the zircaloy sheathing was leaking, and also the contents of the reactor or store were leaking into the atmosphere. The leaked material could be gaseous like iodine, or could be particulate.
If a nuclear reactor leaked you would have to evacuate the area around the plant and you would attempt to stop the leak and probably depending on the severeity level of the situation you may need to 'SCRAM' the reactor.
Never ever
The radiation from a properly functioning nuclear power reactor is heavily shielded and cannot be approached close enough to be fatal. Radiation from damaged or malfunctioning nuclear power plants can be, and has been, fatal. The nuclear reactor incident at Chernobyl is one example. Nuclear reactor failures aboard ships and submarines also prove fatal but are often hidden behind national security; submarine K-19 'the widowmaker' was one such example. And of course, if one were to get into the reactor room past all of the shielding, any reactor would be fatal.
It would be used as a more efficient version of a Nuclear Reactor. While a regular nuclear reactor requires almost a factor of 100 greater in fuel amounts, a Breeder reactor uses much less and produces less waste.
In order to slow down the chain reaction in a nuclear reactor, i.e. to reduce KEff, you would insert the control rods.
Yes, but it would usually be too expensive as tritium must be made in a reactor from lithium.