TEPCO Unveils Plan To Deal With Fukushima Crisis

RedEaredSlider writes "Tokyo Electric Power Co. unveiled its plan for dealing with the crisis at the Fukushima Daiichi nuclear power plant, the worst nuclear disaster since Chernobyl. TEPCO said the radiation levels should drop over the next three months. It will take about six months for the reactors to achieve 'cold shutdown' in which the temperature of the water inside the reactor is less than 100 degrees Celsius (212 F). The current plan for cooling the reactors will mean injecting nitrogen into the reactor pressure vessel. All four damaged reactors experienced hydrogen explosions when water, heated by nuclear fuel, turned to steam and reacted with the zirconium alloy cladding of the fuel rods. Hydrogen, when exposed to oxygen, combusts. Nitrogen is an inert gas, so TEPCO hopes that it will prevent further explosions."

Comments

Best laid plans

[divec]

I wonder WTF their contingency plan is if a big tsunami hits now ...

I strongly believe we know how to set up technical systems for safe nuclear power. However I'm extremely sceptical of the idea that we know how to set up social / administrative systems for safe nuclear power. It's too easy to hide systemic weakness behind secrecy, or too embarrassing to identify and fix present failings, or the debate gets too polarised and ideological so people, politicians and regulatory systems lose sight of the actual safety issues because of the headline effect etc.

I wouldn't be quick to blame money or corruption or unscrupulous people, either. The key problem is secrecy -- even without malice, familiarity makes you blind to system flaws -- we software people know this very well. Only total transparency can ensure that flaws do not get hidden. On the other hand I don't know how this can be reconciled with security against sabotage.

There's a need for a sober, measured debate about all this and it's a pity that a few fundamentalists (on both sides) are making this impossible.

Re:Best laid plans

[lennier]

rather than building newer and safer design

There's a big unstated "if" in that phrase, and that's that newer reactor designs are in fact safer.

I mean, technically, on paper, sure, these third and fourth generation designs em>sound safer. Passive cooling, foolproof, failsafe, etc, etc. It's all very nice and clean and clinical. On paper.

But weren't last few generations of reactors also supposed to be literally failsafe? Never in a thousand years would we see the types of accidents we've had five or so of in the last forty years? We were assured that by people who literally swore on their childrens' lives that it would be perfectly safe.

And of course, the only way we can tell for sure if these new designs - which of course are going to be "lighter" and "cheaper" because they'll have smaller containments - is to build them and run them. And then there'll be pressure to rapidly deploy them. Oh, what does that remind me of? a little thing called the "boiling water reactor" which was a second generation model improved from the old clunky pressurised water systems and didn't need the big heavy containment, because it had this neat "torus" to suppress leakage?

But these new reactors are different you say? Of course they are. They're built by the same companies who made the old, inferior, should never have been deployed ones? Gee, now that's an odd coincidence. I'm sure there's nothing to it. I'm sure we can trust this new generation of nuclear advocates in exactly the way we couldn't trust their fathers.

Lie to me once, shame on me. Lie to me twice... don't let the spent fuel pool blow up and contaminate your farmland on the way out.

Re:I'll say it...

[Kjella]

Question is, would a public-run utility design and build nuclear infrastructure to within the letter of the law or would they 'overbuild' for safety?

If safety margins are needed the safety margins should be in the law, not expecting everyone to overbuild. Just like building codes design for worst possible load and then some - basically you can have the whole place stacked with people doing line dancing and the floor still won't collapse by 100 people jumping simultaneously.