LOS ANGELES (AP) — The operator of an idled nuclear plant on the California coast announced Thursday that more unusual wear has been found on tubing that carries radioactive water, the latest disclosure in a mystery involving the plant’s steam generators.

Southern California Edison said in a statement that investigators at the San Onofre Nuclear Generating Station found additional damage on tubes in its Unit 2 generators that is similar to degradation in its sister reactor, Unit 3, though at a lower level.

Investigators had been puzzled why tube damage appeared different in the sideby side units, even though the equipment is identical.

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