The pool protecting spent nuclear fuel at the Indian Point plant in Buchanan, N.Y. Julie Jacobson/AP
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Emergency generators, which failed after a Japanese nuclear power plant was struck by a tsunami, have failed at 69 nuclear plants in the U.S., according to a new report issued Thursday by a Democratic member of Congress.

Another disclosure in the report: The U.S. Nuclear Regulatory Commission, which overseas public safety, do not require the generators be running at all times, such as when nuclear fuel is not in the reactor core. That could add to risks involving spent fuel stored in pools at many plants; without a back-up electrical system, a failing system could deprive the pools of water needed to keep the spent fuel cool.

At the Fukushima Daiichi nuclear plant, radioactive material escaped from a spent fuel pool. Cooling systems had failed.

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