By Marc Lifsher
October 2, 2013, 6:00 a.m.

Southern California Edison fired another salvo at its former contractor, demanding that Mitsubishi Heavy Industries pay it $140 million for the cost of investigating the failure of steam generators at the San Onofre nuclear power plant.

Edison on Tuesday released a Sept. 27 letter that accused Mitsubishi of “stonewalling” by continuing to seek more documentation about the cost of the utility’s probes.

“Your letter makes clear that Mitsubishi has no intention of meeting its contractual obligations to reimburse expenses incurred as a result of the defective replacement steam generators,” Edison wrote.

Q&A: Why is it closing and what will it cost?

Mitsubishi, now involved in a legal dispute with Edison, declined to respond to the accusations.

The failure of the $769-million steam generators, which leaked small amounts of radioactivity at the San Diego County complex, led to Edison’s decision in July to permanently shutter the 2,200-megawatt generating station. The 30-year-old plant is slated for a lengthy decommissioning process overseen by the federal Nuclear Regulatory Commission

San Onofre was the largest single source of power for 1.4 million households in Southern California.

Edison’s public lambasting of Mitsubishi came as the Rosemead-based company was being pilloried by consumer and ratepayer advocates as well as residents, who live near the plant on the coast in the northwestern corner of San Diego County south of San Clemente.

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