“Some senior engineers at Tokyo Electric Power Co. knew for years that five of its nuclear reactors in Fukushima prefecture had a potentially dangerous design flaw, but the company didn’t fully upgrade them, dooming them to failure when the earthquake hit, a Wall Street Journal examination of the disaster shows.
“The company used two different designs for safeguarding its 10 reactors in Fukushima. When the devastating quake struck on March 11, the five reactors with the newer design withstood the resulting 45-foot tsunami without their vital cooling systems failing. Those reactors shut down safely.
“But the cooling systems failed at four reactors with the older design. Backup diesel generators and electrical-switching equipment were swamped by seawater. As a result, fuel melted down at three reactors and there were explosions at several reactor buildings, culminating in the largest release of radiation since Chernobyl.”
The rest of the article is here.
Filed under: Uncategorized