July-August 2019 NPJ

44 NuclearPlantJournal.com Nuclear Plant Journal, July-August 2019 Upgrade of Safety- Related Buried Piping Using CFRP By Janean Sealey, Dominion Energy. Janean Sealey Janean Sealey is a Generation Project Manager at Dominion Energy who partners with various internal and external company resources to accomplish a wide range of projects. Janean is a committee member of ASME Task Group on Repair by Carbon Fiber Composites. Janean received her Masters of Business Administration from Averett University and Master of Mechanical/Nuclear Engineering from Virginia Commonwealth University. The Nuclear Energy Institute’s Top Innovative Practice Awards highlight the nuclear industry’s most innovative techniques and ideas. This innovation won the 2019 Best of the Best Award. The team members who participated included Janean Sealey, Generation Project Manager, Dominion Energy; Darryl Godwin, Manager Nuclear Projects, Dominion Energy; Anna Pridmore, Vice President, Structural Technologies; Leo Nadeau, Director, Structural Technologies; and Rasko Ojdrovic, Senior Principal, Simpson, Gumpertz and Heger. Dominion Energy presents an innovative, First-of-a-Kind (FOAK) upgrade of a Safety Related (S-R) piping system using a Carbon Fiber Reinforced Polymer (CFRP) System to improve reliability. The first phase of this multi- phased project was completed during the Spring 2018 Refueling Outage (RFO) at Surry Unit 1. Upon completion in 2025, planned FOAK CFRP upgrades will deliver significant operational risk avoidance, savings, and a full, structural upgrade to several Surry Unit 1 and Unit 2 critical, large-diameter S-R piping systems. Background Dominion Energy’s Surry Nuclear Power Station Units and 2 are Westing- house-designed Pres- urized Water Reac- ors (PWRs) and have ntered the Period of Extended Operation PEO). The Circulat- ng Water (CW) and Service Water (SW) System piping has een in service since ommercial operation egan at Surry Unit 1 n 1972 and at Unit 2 n 1973. Routine inspections required by American Society of Mechanical Engineers (ASME), Boiler & Pressure Vessel Code (B&PVC), Section XI, “In- Service Inspections of Nuclear Power Plant Components” identified significant corrosion on the interior surfaces of the CW and SW Carbon Steel (CS) piping. During RFOs this piping has been routinely drained, cleaned, inspected, repaired, and coated with a ceramic- epoxy coating system. These maintenance activities have been very costly and have often impacted the RFO critical path, and the overall condition of the CS piping has continued to degrade, increasing the possibility of an unplanned outage. The key objectives of this FOAK CFRP Project are:  Safe work practices, first and foremost.  High quality and technically sound engineering design.  Meet or exceed performance expectations (e.g., Human Performance, Safety Conscious Work Environment (SCWE), procedure compliance).  Complete high-quality work, on schedule and within budget.  Mitigate corrosion by repairing degraded piping sections.  Ensure long-term equipment reliability by providing for a 50-year service life.  Effective Quality Control program. Dominion Energy partnered with the Structural Group companies, Structural and Structural Technologies, and the Design Engineer, Simpson Gumpertz & Heger (SGH). This expert team designed, manufactured, and installed a FOAK structural upgrade for the CW and SW S-R piping using the V-Wrap™ CFRP system. The V-Wrap TM CFRP system is a lightweight, high-strength composite material installed on the interior of the pipe. The installation process for the V-Wrap TM CFRP system uses existing access points and requires no excavation. The following S-R piping components, totaling approximately 200 linear feet, were safely upgraded during the Spring 2018 RFO:  96-inch CW System inlet piping from the Intake Canal to the Main Steam Condenser isolation valves.  24, 30, 36, 42, and 48-inch SW pipe headers from the CW System to the Recirculation Spray (RS) System piping and Component Cooling Heat Exchangers (CCHX) supply lines. This S-R piping is:  Designed to the ASME B&PVC, Section 3, “Rules for the Construction of Nuclear Facility Components”, Subsection ND, “Class 3 Components”.  Concrete-encased and buried. The concrete encasement of the piping systems is a Seismic Category l structure and provides the seismic support for this piping. The piping was originally fabricated of CS material conforming to American Society of Testing and Materials (ASTM) A-283, Gr. B, “Standard Specification for Low and Intermediate Tensile Strength Carbon Steel Plates” and American Water Works Association (AWWA) C201, “Standard Specification for Electric Fusion Welded Steel Water Pipe”. Use of a CFRP system for pipe applications is a technology improvement which was not available in the 1960s or 1 s t e ( i b c b i i