As Pacific Gas & Electric continues to press for a 20-year extension of the operating license for its Diablo Canyon nuclear plant, legislation to prevent an extension was introduced Sept. 26. HR 6554 specifies the Nuclear Regulatory Commission cannot approve a license renewal application for a plant if its owner applies for an extension more than 10 years before the power plant\u2019s license expires. \u201cIt seems crazy that the NRC would even consider relicensing aging nuclear plants more than a decade before its license expires. As these facilities age, safety concerns inevitably arise,\u201d Rep. John Tierney (D-MA) stated. Pacific Gas & Electric deferred comment to the Nuclear Energy Institute. \u201cThe proposed legislation\u2019s time frame would unnecessarily and artificially constrain\u201d the industry\u2019s \u201cforward-looking horizon,\u201d Tony Pietrangelo, senior vice president, stated. Federal regulators released details of PG&E\u2019s responses to technical questions over Diablo reactors\u2019 relicensing Sept. 25. The statements reveal the utility is pursuing a license extension with engineering specificity--indicating a significant man-hour investment. So far, California ratepayers have not been handed a bill for the work behind PG&E\u2019s quest for a licensing extension. Diablo has a license to operate under existing federal rules until 2024-25 for the two units on site. The NRC delayed finalization--but not the ongoing process--of Diablo\u2019s relicensing in 2011. The rationale was to allow PG&E to complete gathering new seismic data on the plant. Federal regulators do not have to consider any new data from the utility, but did promise to allow for its submittal. That data gathering is set to begin in November off the Central Coast using sonic cannons to map earthquake potential. Meanwhile, on Aug. 12, federal regulators stopped their own internal license renewal process for all reactors because a federal appeals court determined the agency has not considered the environmental impacts of high-level radioactive spent fuel on site at licensed and relicensed, reactors. So far, NRC has relicensed 73 reactors of the nation\u2019s 104 operating nuclear plants.