In 1989 the Atomic Energy Control Board (AECB) received additional resources, which will enable it to improve its regulatory ability, causing some reorganization of staff and the consolidation of the analysis and assessment functions in a new directorate. The year marked the commissioning of the first unit of the Darlington Generating Station. The start-up of this unit was delayed because the AECB had doubts about the safety aspects of the software for the two emergency shutdown systems. The accidental spill of contaminated water from the Rabbit Lake Mine in Saskatchewan allowed the AECB to detect some deficiencies in its inspection system and to correct them. The incident also emphasized the need to impose much higher fines and penalties on companies that violate the Atomic Energy Control Act. This report describes further activities of the AECB in the regulation of nuclear facilities, radioactive waste management, and nuclear materials handling; regulatory research; safeguards and security work; international activities; and public information.