In other words, the integrity of the nuclear reactor's coolant system to withstand what engineers call a "station blackout"--(where a power loss compromises or totally destroys the coolant system)-- must be reexamined in older and newer nuclear plants. Without a coolant system in play for these "boiling water' reactors--there is no way to prevent spent radioactive fuel from going "critical' and exploding into the atmosphere. As Bridenbaugh explains in more genteel tech-speak:
"The impact loads the containment would receive by this very rapid release of energy could tear the containment apart and create an uncontrolled release." (Source : http://abcnews.com/Blotter/fukushima-mark-nuclear-reactor-design-caused-ge-scientist/story?id=13141287 )
Subsequently, secondary or back-up power generators are critical to public safety. Without such precautions, nuclear reactors such as those at Fukushima are little more than a radioactive time-bomb ..."looking for a place to happen.'
Fukushima--revolving door ...
The problems of Fukushima are endemic to the nuclear industry at large, where executives are frequently selected from government or business ranks rather than the scientific community. Fukushima was no exception. In a WikiLeaks revelation--cables sent from the US Embassy in Vienna to Washington DC cited Tomihiro Tanguchi's weak leadership as head of Safety and Security for the International Atomic Energy Agency ( IAEA). Complaints mounted concerning Taniguchi's incompetence and negligence especially with regards to the Japanese nuclear industry--eighteen months before the Fukushima disaster.
"For the past 10 years, the Department has suffered tremendously because of (deputy director general) Taniguchi's weak management and leadership skills," said one despatch on Dec 1, 2009.
"Taniguchi has been a weak manager and advocate, particularly with respect to confronting Japan's own safety practices, and he is a particular disappointment to the United States for his unloved-step-child treatment of the Office of Nuclear Security," said another, which was sent on July 7, 2009
TEPCO's history of fraud...on top of a flawed Mark 1 design...