Turbine Supervisory Instrumentation
The turbine supervisory instrumentation (TSI) system is a monitoring system for main turbine vibration. The digital upgrade for the TSI system addresses obsolete equipment and provides for future expansion to include the main feedwater pump turbine vibration instrumentation. A Bently Nevada System was installed for the TSI system digital upgrade. This project was completed in 2008.
Automatic Feedwater Isolation System
The automatic feedwater isolation system (AFIS) performs a safety-related design function and isolates feedwater to a steam generator for specific design basis events. For the Babcock & Wilcox station design, steam generator isolation is required during some postulated accidents to prevent excessive reactor cooldown. Because AFIS is a new system added to address plant response during specific design basis events, a redundant safety-related digital platform was designed for the upgrade (by AREVA) using safety-related STAR modules. The installation of AFIS on all three ONS units was completed in 2002.
Keowee Hydroelectric Station’s Exciter and Governor
Most nuclear power plants rely on diesel generators to supply emergency electrical power. ONS has an emergency power design in which Duke Energy’s Keowee Hydroelectric Plant provides one source of emergency backup power. The Keowee Hydroelectric Plant was designed and placed in commercial operation in 1971. Due to its role in ONS support, upgrades for its exciter and governor systems were performed under the nuclear quality assurance program.
The Keowee exciter was upgraded to address obsolete equipment issues. A redundant system was obtained from General Electric using Nuclear Logistics Inc. as the third-party qualifier. Nuclear Logistics Inc. qualified the Keowee exciter for safety-related design criteria including seismic, equipment qualification, electromagnetic interference, and other criteria.
In addition, the Keowee governor was upgraded to address obsolete equipment concerns. Duke used the AREVA Teleperm XS system to provide controls for Keowee. The control system had specific performance criteria unique to the Keowee design due to its operational requirements.
Digital upgrades to the Keowee exciter and governor systems were completed in 2004.
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