President Nicolae Ceausescu has acknowledged publicly that Romania has the potential to make nuclear weapons but says it will not do so, according to a report by the state news agency Agerpres. “Technically, we have this ability, but . . . we are firmly resolved to fight against nuclear weapons,” Agerpres quoted Ceausescu as telling the Socialist Democracy and Unity Front, a Communist-led organization. In a separate speech concluding a three-day Communist Party Central Committee session, Ceausescu also said that he will submit a law that would ban new hard currency borrowings. On Wednesday, Ceausescu told the session that Romania had repaid its $21-billion foreign debt.