'Caretaker' named to fill Williams's Senate term

Gov. Thomas H. Kean appointed Republican Nicholas F. Brady to the Senate to fill out the term of Democrat Harrison A. Williams Jr., who resigned after his Abscam conviction. Mr. Brady, expected to be a strong booster of President Reagan, said he will serve as a caretaker senator through the November election, but made it clear ''I am not, nor will I be, a candidate in the Senate race.'' Brady is managing director of the New York investment banking firm of Dillon Read & Co. and chairman of Purolator Inc.