A Chicopee cop has been accused of committing a rape and kidnapping while on a weekend drill with his National Guard unit, prosecutors and police said.Corey Fournier, 27, of Chicopee pleaded not guilty to two counts of rape, kidnapping, and assault and battery, at his arraignment yesterday in Clinton District Court. He was ordered held on $5,000 cash bail, according to Worcester County District Attorney Joseph Early’s office.