Temperature was 500° Celsius, Japanese firefighters poured water reactor, for temperature 800 ° Celsius means chain reaction and atomic explosion. I had made an advise : if poured methanol, it's plasma from it +96° Celsius and warm chang would decrease temperature of reactor: + 500° + 96° = 596° , then 596°: 2 = 298 ° Celsius . That's temperature far away from explosion and this get ability to make a repair of cooling system. Advice was quite correct.