UCI Medical Center has fired 13 nurses in the last three months and is investigating a union activist who sought information about one of the dismissals, according to the nurses' union.
Eight of the nurses have more than 20 years of experience each, and four of those have spent their two decades at UCI, union officials said. Hospital officials would not comment on why the nurses were let go.
Susan Mancia, a hospital spokeswoman, said UCI was ranked among the top five hospitals in Southern California in a survey for Nurses magazine, in which nurses graded the quality of care, organizational culture, development, communications and retention efforts.
The hospital, which is in Orange, also has received a designation from the American Nurses Credentialing Center, which demonstrates a hospital's ability to attract and retain highly trained nurses.