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Medium voltage (MV) cables, which typically operate in the range of 2 kV to 35 kV, are commonly used in nuclear power plants (NPPs) throughout the world. These cables support the safety and wellbeing of NPPs by providing supplementary power for safety systems to continue operating during emergency events such as natural disasters or human-induced outages. This allows for uninterrupted reactor operations for a short period of time until the primary safety systems can be brought back online. Given their critical importance to the operation of NPPs, MV cables are often installed in locations such as underground concrete ducts or electrical conduits that limit cable exposure to environmental stressors such as moisture and temperature. Despite the fact that these cables are not operating continuously given the overall rarity of NPP emergency events, they must still satisfy reliability and lifetime performance requirements of cables used in primary NPP operations.
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Unbonded post-tensioned reinforcement in concrete structures has been used for many years in elevated slabs (parking garages and residential or commercial buildings), residential foundations, walls, and columns and more recently in bridge structures. The use of unbonded post-tensioned reinforcing allows for unique and cost-effective design and construction that include: thinner concrete sections, longer spans between supports, stiffer walls to resist lateral loads, and stiffer foundations to resist the effects of shrinking and swelling soils.