The Mainichi Daily News: News Navigator: What is a 'cold shutdown' at the Fukushima nuclear plant?December 17
[Excerpted] "Question: What does it mean when a nuclear reactor has achieved a "cold shutdown?"
Answer: It means the reactors have been stabilized and shut down. Under normal circumstances this means control rods have been inserted into the gaps between the fuel rods in the reactor, and the temperature of the water in the reactor pressure containers is below 100 degrees Celsius. In this scenario, fuel rods are contained within the pressure container, with no radiation leaking out.
Q: Is this the definition being used for the Fukushima No. 1 Nuclear Power Plant?
A: No, a slightly different definition is being used. Meltdowns have occurred at the Fukushima plant and the reactors are damaged, so when the government formulated "Step 2" of its nuclear disaster management plan, the phrase took on a slightly different meaning. The government has defined a cold shutdown for the Fukushima plant as a situation in which the temperature at the bottom of the reactor pressure containers is less than 100 degrees Celsius, and the radiation levels at the edge of the plant premises are below one millisievert per year..." [End quote]
MAJIA HERE: when the corium is no longer in the reactor pressure vessels it shouldn't be too hard to get a reading of less than 100 degrees Celsius.
Read the links below for evidence of melt-throughs at the plant, which demonstrate that Tepco's claim of cold shutdown is MEANINGLESS PROPAGANDA