Fukushima I Nuclear Power Plant http://en.wikipedia.org/wiki/Fukushima_I_Nuclear_Power_Plant
Daiichi Reactor Design http://www.anengineerindc.com/2011/03/daiichi-reactor-design.html
Fukushima Daiichi 1 http://nirs.org/reactorwatch/accidents/Fukushimafactsheet.pdf
Reactor / Design / Size / Commercial / Date of Operation
Fukushima I-1 General Electric Mark I BWR 439MW March 1971
Fukushima I –2 General Electric Mark I BWR 760 MW July 1974
Fukushima I – 3 General Electric Mark I BWR 760 MW March 1976 – PLUTONIUM
Fukushima I – 4 General Electric Mark I BWR 760 MW October 1978
Fukushima I – 5 General Electric Mark I BWR 760 MW April 1978
Fukushima I – 6 General Electric Mark II BWR 1067 MW October 1979
#Danger of Losing Control of the Reactor Is Greater with MOX http://www.nirs.org/reactorwatch/mox/puupdat4.txt
Conventional LWRs are designed to decrease the reactivity when the temperature rises.
- But when using Pu-239 as fuel, heating of the core from an increase in reaction rate tends to increase the reaction rate still further.
This is called the positive temperature coefficient of reactivity, meaning there is a danger of losing control of the reactor by accelerated chain reaction of fissioning.