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Diablo Canyon nuclear plant 'near miss' in report
Key Excerpts from Article on Website of San Francisco Chronicle (San Francisco's leading newspaper)


San Francisco Chronicle (San Francisco's leading newspaper), March 18, 2011
Posted: March 22nd, 2011
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/03/17/...

For 18 months, operators at the Diablo Canyon nuclear plant near San Luis Obispo didn't realize that a system to pump water into one of their reactors during an emergency wasn't working. It had been accidentally disabled by the plant's own engineers, according to a report ... from the Union of Concerned Scientists watchdog group, [which] lists 14 recent "near misses" - instances in which serious problems at a plant required federal regulators to respond. The report criticizes both plant operators and the Nuclear Regulatory Commission for allowing some known safety issues to fester. The problem at Diablo Canyon ... involved a series of valves that allow water to pour into one of the plant's two reactors during emergencies, keeping the reactor from overheating. A pair of remotely operated valves in the emergency cooling system was taking too long to move from completely closed to completely open. So engineers shortened the distance between those two positions, according to the report. Unfortunately, two other pairs of valves were interlocked with the first. They couldn't open at all until the first pair opened all the way. No one noticed until the valves refused to open during a test in October 2009, 18 months after the engineers made the changes.

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