About 150 nurses walked off the job at San Francisco's French Hospital Saturday, swelling the number of striking registered nurses and service employees to 3,800 at eight city facilities.

And 1,600 nurses employed by city-owned San Francisco General and Laguna Honda Hospitals and their satellite clinics were poised to join the strike Tuesday.The walkout comes about six months after a three-day strike in late January by some 4,000 nurses against county-run hospitals and clinics in the Los Angeles area. The strike is the first in San Francisco since formation of the California Nurses Association (union) in 1983.

The French Hospital nurses are seeking an immediate pay boost of 11 percent and 10 percent in 1989 in a two-year contract - the same demand as the nurses who talked out Tuesday at Children's, Marshal Hale, Mount Zion, St. Francis and St. Mary's in San Francisco and Seton Medical Center in Daly City.