Constructed in the early 1980s by the Arizona Public Service Company, the water reclamation supply system at Palo Verde Nuclear Generating Plant consists of thirty-six miles of prestressed concrete cylinder pipe (PCCP), with diameters ranging from 66 in. to 114 in. The circulating water system used in the three nuclear reactor units for secondary cooling includes PCCP with diameters ranging from 96 in. to 144 in. After failure of one pipe segment in 1996 and two segments in 1997, SGH conducted a condition assessment of the pipelines and designed repairs for distressed pipe.