sentences:  The scope and complexity of the accident became clear over the course of five days, as employees of Met Ed, Pennsylvania state officials, and members of the U.S. Nuclear Regulatory Commission (NRC) tried to understand the problem, communicate the situation to the press and local community, decide whether the accident required an emergency evacuation, and ultimately end the crisis.The NRC's authorization of the release of 40,000 gallons of radioactive waste water directly in the Susquehanna River led to a loss of credibility with the press and community.The 1979 Three Mile Island accident inspired Perrow's book "Normal Accidents", where a nuclear accident occurs, resulting from an unanticipated interaction of multiple failures in a complex system.