July-August 2019 NPJ

Nuclear Plant Journal, July-August 2019 NuclearPlantJournal.com 49 Nuclear Plant Journal Advertisers Web Directory American Crane & Equipment Corporation www.americancrane.com Bechtel Power www.bechtel.com/nuclear BIRNS, Inc. www.birns.com Framatome www.framatome.com/us HydroAire Service, Inc. www.hydroinc.com Rolls-Royce www.rolls-royce.com RSCC Wire & Cable www.rsccnuclearcable.com SSM Industries, Inc. www.ssmi.biz Thermo Scientific- CIDTEC www.thermo.com/cidtec Westinghouse Electric Company LLC www.westinghousenuclear.com World Nuclear Association www.wna-symposium.org bulkheads, elbows, pipe penetrations, and other features. Walkdowns of travel and material transport paths were conducted by Structural, Dominion Energy’s Field Leadership, and Operations Representatives to identify and protect Operations Critical equipment. Installation tasks (e.g., surface preparation, epoxy mixing, fabric saturation, curing) were included in procedures controlled by Dominion Energy’s QAP and Work Management System. Procedures included requirements for documenting key engineering attributes on QC inspection forms, hold points, witness points, and participation by Dominion Energy Engineers, Structural Field Leadership, SGH Engineers, and SGH 3rd Party Inspectors. The Authorized Nuclear Inspector (ANI) was also engaged by Dominion Energy to provide independent oversight of related ASME B&PVC, Section XI activities. To facilitate in-process inspections and rework of anomalies expected during installation, rework methods are included on the design drawings provided by SGH. These rework methods are based on previous Operating Experience and Lessons Learned. Including rework methods on the design drawings has the net effect of improving quality, since they are part of the installer training process, and reduces schedule delays performing rework. 4.QualityControl (SGHEngineering, Structural, Dominion Energy, SGH 3rd Party QC, and ANI). A FMEA was prepared to support this FOAK NRC materials exemption request (Reference 1). The effects (consequences) of the failures include leakage, pipe rupture, reduced flow, and clogging of the pipeline at locations downstream of the failure. These failure modes and the consequences of failure are prevented by designing the CFRP system to have the required strength for specified loads, selecting the proper materials (i.e., primer, saturating epoxy, CFRP, GFRP) constituting the CFRP system, proper training of all personnel involved in design, installation, and QA/ QC inspection, proper surface preparation to avoid debonding of CFRP from the pipe (although the repair is designed as a standalone system), proper impregnation of fabric to avoid delamination between the CFRP layers, curing of CFRP prior to refilling of the pipeline, and continuous quality control and quality assurance inspections throughout the construction. A comprehensive Quality Plan was developed from the FMEA to mitigate or eliminate areas of risk. The Quality Plan identified key engineering attributes like surface preparation, temperature controls, humidity controls, epoxy mixing, material saturation, installation, and curing. These engineering attributes were used to determine in-process and QC Inspection requirements necessary to complete a high-quality installation. Non-S-R repairs have been previously performed in 2015, with preplanning beginning in 2014. During the 2015 RFO, a FOAK, full scale mock- up of procedures, installations methods, in-process/QC inspections and related documentation was accomplished by installing the V-Wrap™ CFRP System into Non S-R CW and SW System piping segments. Using this innovative mock-up approach, the V-Wrap™ CFRP System’s installation methods and QC inspection program were tested and became a field proven methodology. In-process inspections by qualified installers and Field Leadership, active participation by independent 3rd party QC inspectors, and proactive, hands- on oversight of installation activities by Dominion Energy Representatives and SGH Engineers were highly successful in the mock-up phase of the project. References 1. Surry Power Station Units 1 and 2, Serial No. 16-448, Dockets 50-280/281, License Nos. DPR-32/37, Proposed Alternative to ASME Section XI Requirements for Repair/Replacement of Circulating Water and Service Water Class 3 Buried Piping inAccordance with 10CFR50.55a(z)(1), dated December 14, 2016. 2. Letter to Dominion Energy (Daniel Stoddard, CNO) from NRC (Michael Markley, Chief, Plant Licensing Branch), Surry Power Station, Unit Nos. 1 and 2, Relief from the Requirements of the ASME Code, dated December 20, 2017. Contact: Janean Sealey, Dominoin Energy, telephone: (757) 365-2452, email: janean.sealey@domionenergy. com.