ASSESSMENT, REPAIR AND MONITORING OF THE GENTILLY-1CONCRETE CONTAINMENT STRUCTURE

摘要

The Gentilly-1 CANDU-250 MWe Nuclear Power Plant in Quebec, Canada, has been decommissioned. The spentrnfuel has been removed and the building serves only as storage for some of the used reactor components and low-levelrnradioactive materials. The structure, about 30 years old, is showing signs of aging. Hence, studies were undertaken torndetermine if any remedial measures were needed. This is required to ensure that the prestressed concrete containmentrnstructure would fulfill its functional requirement for the next 50 years or more. This paper summarizes the results of thernevaluation of the structure. The investigation showed that the structural concrete forming the dome and the wall could bernexpected to service for the required period. However, portions of the ring-beam needed repair. Different designs for thernrepair of the ring beam were considered. The design of the remedial work and the monitoring system that has beenrninstalled to ensure satisfactory long-term performance of the repaired ring beam are described.