WASHINGTON, May 25 (AFP) - Energy Secretary Bill Richardson vowed Tuesday to "clean up" security problems in his department amid the release of a congressional report outlining 20 years of Chinese spying on US military labs. "I am trying to clean up a mess and I think we're doing a good job," Richardson said Tuesday, while singling out previous administrations. "This administration has acted on the problem. Previous administrations didn't act," he stated. Richardson said that the Clinton administration implemented "strong measures to prevent the kinds of security breaches" in February and due to these changes many of the report's findings are "now outdated." The report said China stole secrets on every key US nuclear warhead made since the 1970s to update its own arsenal, and passed some of the data to fierce US foes. "Not every allegation (of the report) is a proven fact," Richardson said. While there is no evidence of a "wholesale loss of information," he said that "China probably accelerated its program to develop future nuclear weapons." "What China has done in espionage is inexcusable. It's wrong," he stated. The secretary added that the full extent of the weapons information obtained by China could not be determined. However, Richardson, who came to the post in September, said he supports the majority of the report's recommendations and suggested a bipartisan approach in addressing the matter. Another report on the lack of security at the Los Alamos nuclear lab in New Mexico is due out next week, he added. Recently, a Taiwanese worker at Los Alamos suspected of passing sensitive information to Beijing was fired. The lab has some of the most confidential and important information on US military nuclear research.  