July-August 2019 NPJ

Nuclear Plant Journal, July-August 2019 NuclearPlantJournal.com 45 (Continued on page 46) 1970s and is not included in Surry’s Final Safety Analysis Report (FSAR). There are currently no provisions in ASME B&PVC, Section XI or an approved ASME B&PVC Case for installing CFRP systems as a Section XI repair for Class 3 piping. Pursuant to the requirements of 10CFR50.55a, “Codes and Standards”, Dominion Energy submitted an In-service Inspection (ISI) alternative material request to the Nuclear Regulatory Commission (NRC) requesting approval to use the V-Wrap™ CFRP System for the S-R SW and CW System pipe upgrades (Reference 1). The proposed alternative material to the ASME Section XI requirements was subsequently endorsed by the NRC (Reference 2). TheCFRPmatrixhasbeenengineered by SGH to meet the requirements of the original design criteria and design code (ANSI B31.1 1968) and will functionally replace the existing carbon steel pipe. During the Spring 2018 RFO, this FOAK installation of the V-Wrap™ CFRP System in a S-R System at a nuclear facility was governed by strict adherence to the NRC-endorsed design, material manufacturing, and installation requirements in accordance with:  Dominion Energy’s 10CFR50, Appendix B, “Quality Assurance Criteria for Nuclear Power Plants” Quality Assurance Program (QAP) including ASME NQA-1, “Quality Assurance Requirements for Nuclear Facility Applications”.  American Society of Mechanical Engineers (ASME) Boiler & Pressure Vessel Code (B&PVC), Section XI, “Rules for In-Service Inspection of Nuclear Power Plant Components”. Innovation Installation of a CFRP system is the first project approved in the Subsequent License Renewal (SLR) program at Surry Nuclear Power Station. Given factors such as the age of the plant, operational requirements of the system, and the pursuit of a license extension, the case for implementing innovative and proactive asset management programs within the Dominion Energy Fleet is strong. From the initial investigations through asset evaluation and determination of the path forward for repair methodologies, the V-Wrap™ CFRP System Project at Surry demonstrates FOAK, innovative thinking at its best. This project will lead to increased reactor safety and improved operational performance and will address reliability challenges faced by Dominion Energy at Surry, and potentially other nuclear stations across the United States, reducing long-term Operating & Maintenance (O&M) costs. Implementing an asset management program, such as the one that led to this CFRP solution, requires several key components and a complex decision tree. In-service inspections are the primary building blocks of any asset management program related to S-R piping. Collecting and evaluating data to determine risk level, performing engineering analysis, and identifying replacement or repair strategies are also important steps. In the case of Surry’s S-R CW and SW Systems, pipe failure could lead to potential life-safety issues, challenges to reactor safety, and damage to S-R structures, components, or equipment. The potential for a forced shutdown must be considered, which would lead to unplanned demands on safety systems, considerable loss of revenue, and additional regulatory oversight. A FOAK Failure Modes and Effects Analysis (FMEA) for the use of a CFRP system in S-R piping was performed. The FMEA demonstrated that the benefits, risk profile management, and proposed installation of the V-Wrap™ CFRP System were achievable and met performance and reliability objectives established by Dominion Energy. Based Manway Access with CFRP and Compression Ring Installed.