WASHINGTON — An internal investigation has concluded that the departing chairman of the Nuclear Regulatory Commission engaged in bullying and intimidation, creating a tense working environment at the agency.

The report by the NRC's inspector general found at least 15 instances when NRC Chairman Gregory Jaczko (YAHTS-koh) acted in a way that senior employees or fellow commissioners found intimidating or bullying.

The report also said Jackzo's testimony before House and Senate committees last December was "inconsistent" with testimony provided to the inspector general by senior NRC officials. The committees were investigating Jaczko's behavior.

The report upheld Jaczko's declaration last year that Japan's nuclear crisis constituted an emergency for the United States.

A summary of the report was obtained by The Associated Press.

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Jaczko announced his resignation in May.

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