I’m going to break the format of this blog a bit, such as it is, to make a few journalistic observations about the US response to the earliest days of Fukushima.
Firstly, the US NRC seems to have been shell-shocked by the event. It should have been obvious from the first day that Unit 1 was in meltdown. The commission knew, for a fact, that there was no cooling in the core; this is well established. And it does not take a degree in nuclear physics to know what happens to nuclear cores without cooling. Yet it was three days before anyone was willing to admit the obvious, even to themselves. By all accounts the commissioners just watched the clock as over forty hours-without-cooling ticked by, and continued to assure the world that Japan had it under control. It is as if a lifetime of fervently espousing the impossibility of core-melts had made them unable to see what was right in front of their eyes.
This is cognitive dissonance on an epic scale.
Secondly, the Defence Department seems to have been much quicker to grasp the nettle. It was the Navy’s nuclear reactor division that appears to have been the real driver for belated US action. (The voluntary evacuation order, for instance, and a strongly worded message to the Prime Minister suggesting ‘heroic action’ — ie: suicide squads — when it looked like TEPCO were pulling out.)
Thirdly, the limited US evacuation recommendation (50 miles) was far too limited from a safety perspective. Within 72 hours it was clear to everyone that the citizens of Tokyo were in serious jeopardy. This is to say there was substantial evidence of a zirconium fire in the unit 4 spent-fuel pool (not least the fact that the building exploded, despite there being no fuel in the reactor core) — an event that would have released a tremendous amount of radioactive fallout, and would almost certainly have led to the loss of a much larger pool nearby. As it happened, the fuel had begun to melt but the Japanese were able to bring the pool back from the brink; but nobody at the time took this for granted.
When questioned about this, authoritative experts repeatedly stress that the NRC simulations showed no threat to Tokyo, even from a spent fuel fire. What they don’t say, however, is that the NRC simulations (which use a system called RASCAL) were only capable to modeling effects up to 50 miles out, and so they could not have shown a threat to Tokyo under any circumstances. The Germans had already advised their citizens to evacuate the capital, no doubt at some diplomatic cost. So had the French, the Russians and the Chinese — all countries with heavy nuclear investments and none of them exactly wilting violets when it comes to radiological hazards.
Tokyo was in serious trouble, and the US must have known.
This leads to my final observation: that the US decision not to order an evacuation beyond 50 miles — quickly and obediently echoed by the UK — was a political decision not an evidence-based calculation. It was a decision to put US citizens in Tokyo at risk as a favor to the Japanese government, who were desperately worried that a mass international evacuation would have led to uncontrollable panic in their capital.
It was a gamble that paid-off. Other countries looked to the US for cues and echoed their recommendations, stemming the tide of evacuation recommendations. Mass panic was averted. TEPCO — with ‘heroic efforts’ and no small amount of heroic luck — were able to save the spent-fuel pool, and with it the residents of Tokyo. (Although it remains in jeopardy).
In other words, Japan owes the US a solid, and they’re acutely aware of the fact. Sore misgivings about US bases on Japanese soil have all but disappeared since the crisis.