Repairing Concrete Deterioration

摘要

Built by Baltimore Gas & Electric in the 1970s on 2,300 acres of prime waterfront property, the Calvert Cliffs Nuclear Power Plan became the first plant in the US to earn a 20-year extension of its operating licenses from the Nuclear Regulatory Commission. While this March 2000 milestone is significant, the reactors, built in 1975 and 1977, were beginning to show their age. Several factors contributed to the deterioration of the concrete. First, there was constant exposure to saltwater, which had inundated the system for three decades. Second, several pieces of large electrical equipment grounded to the slab were sending stray currents through the concrete. Third was the age of the structure itself. The first phase of the repair project, which represented approximately 15% of the overall scope, took approximately five months. The remaining 85% of the work, which was split into five phases, was completed in eight months, which shows an increase in project efficiency.