Reactors must be able to handle the worst if we hope to prevent a repeat of last year’s meltdowns.
http://A year after Japan’s largest earthquake and most destructive tsunami led to the Fukushima nuclear accident, experts say the industry has moved beyond any claims of absolute safety. As happened after the 2010 BP oil spill in the Gulf of Mexico, experts now recognize that any technology—whether it’s deepwater drilling or nuclear fission—can and will fail, and operators must prepare for the worst.”Fukushima Daiichi … was not just due to an inadequately sized seawall—that is the wrong way to look at it,” says Edward Blandford, a professor of nuclear security at the University of New Mexico and a postdoctoral fellow at Stanford University’s Center for International Security and Cooperation. “The events at Fukushima Daiichi were due to a series of failures, including failures in plant defensive actions, mitigation efforts, and emergency response. If backup equipment had been stored in waterproof vaults or higher elevations, the accident would have most likely been avoided.”
Indivīdi un sabiedrības mācās no savām ciešanām, no bojāejām. Raksts rāda, ka būs jāmācās vēl: īsto cēloņu (neoptimāls kompromiss starp līdzekļu taupīšanu un drošības pasākumiem, jeb, vienkārši sakot, mantkāre) nosaukšanas aizvietošana ar miglainiem izteikumiem (Nuclear experts say the key to controlling future incidents and thus restoring faith in nuclear energy is a “defense in depth” approach to reactor design and emergency preparedness) liedz sabiedrībai apgūt pilnu mācību: daudz drošāki risinājumi (Thorium reactors aprakstīti šajā mājaslapā) ir zināmi. Bet tiem ir liels ‘trūkums’ – to degvielu nevar izmantot kodolbumbu ražošanai.
Reactors and radioactive materials at Fukushima Daiichi were destabilized by back-to-back beyond design-basis events. First was the magnitude 9.0 earthquake that felled the plant’s power lines, triggering diesel generators to maintain cooling of its reactor cores and spent fuel rods. Less than an hour later, the generators along with some of the plant’s last-resort battery power backup were gone, knocked out by a 14-meter tsunami wave that crested the plant’s seawall.