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Thursday, July 26, 2007
Do faults run deeper than Tepco safety vows?
The response by Tokyo Electric Power Co.'s Kashiwazaki-Kariwa nuclear power complex to the July 16 magnitude-6.8 earthquake that hit Niigata Prefecture fell short, a top Tepco official admitted Wednesday, laying partial blame on communications difficulties.
Tepco Executive Vice President Ichiro Takekuro also revealed the utility lacks the information to gauge the impact that a magnitude-8 temblor — uncommon but not unheard-of in Japan — would have on the plant, which apparently sits on the fault line along which the quake occurred but was only designed to weather a magnitude-6.5 shock.
Immediately after the quake, Tepco summoned all available manpower at the seven-reactor, 8.2 million kw complex — the world's largest in terms of power output — in Kashiwazaki, Niigata Prefecture, to assess the impact, Takekuro told reporters at the Foreign Correspondents' Press Club in Tokyo.
But damage to the main office's communication systems impeded efforts to gather and distribute critical information, he said, adding, "There is a lot we need to do to make improvements, both in terms of equipment (and) technical matters as well as the aspect of management."
Right after the temblor hit, water started leaking from the spent fuel pool at the No. 6 reactor and a transformer fire started at the No. 3 reactor that burned for about two hours. Tepco eventually reported 63 problems at the complex, including low-level radiation leaks.
News reports blamed the slowness in extinguishing the fire on swamped telephone lines and weak safety guidelines from the central government. It was also reported that the facility lacked the proper equipment to fight a blaze of this type.
Assurances from utilities and government agencies that reactors can be made quake-proof face mounting skepticism, because Tepco and other utilities are no strangers to the act of concealing shortcomings.
In March, 12 utilities owned up to 97 incidents of nuclear plant-related malpractice. The most serious involved Tepco and Hokuriku Electric Power Co., which had failed to report reactor control rod accidents leading to uncontrolled criticality accidents. Skeptics wonder how well Japan's 55 nuclear plants can perform in the widely expected eventuality of the Big One.
In 2005, the Cabinet office's Central Disaster Prevention Council calculated a 30 percent chance of a massive earthquake in Tokyo within the next decade, and a 70 percent chance within 30 years.
Records show that over the past century, Japan has experienced an average of one magnitude-7 or greater quake yearly.
An earlier version of this story had erroneously cited the magnitude of a potential future quake as magnitude 6.8. In fact the figure should have been magnitude 8. We regret the error.