Atom Bomb Survivor Here -- Miss Kay Polchikoff (center), 26, a White Russian girl who survived the atom bombing of Hiroshima, arrives here today to visit her Americanized brother, Nicholas (right), and his wife (left). She said she had come to this country to become and American citizen and declared to talk about Paul Drago of Camden, N.J., a former Army private who had said she was his Fiancee. Atom-Bomb Survivor - Kay Polchikoff, 26, from Hiroshima, welcomed at Los Angeles by her brother, Nich