More than 31,000 union nurses and hospital staff sent a strike notice to Kaiser Permanente on Friday indicating their intent to walk off their jobs with the Oakland-based healthcare system on Oct. 14. The United Nurses Associations of California/Union of Health Care Professionals said it would be their largest strike against Kaiser, with tens of thousands of nurses and healthcare professionals striking at two dozen hospitals and clinics across California and Hawaii. A Kaiser Permanente spokesman could not immediately comment on the union’s notification to strike. The contracts of 46,000 of these Kaiser workers expired Sept. 30 or Oct. 1, and nearly all of their local unions have given Kaiser 10-day strike notices. The decision to strike comes after six months of bargaining for UNAC/UHCP, which represents registered nurses and healthcare professionals in the two states.