13. Large Stud Bolt Diagnosis & Manufacture
Stud bolts are subject to slanting and centerline moving phenomena between screws primarily due to fatigue and aging degradation when used for a long period at high temperatures. Such problems can also result in reduction of fastening strength and internal sticking. Accordingly, KEPCO KPS has carried out close, integrated examination and evaluation since 1998 to resolve problems with flanges and bolts at high temperatures. As a consequence, we provide the finest maintenance and engineering services, introducing up-to-date technologies(MSI, heli coil, bushing).
Items
Nuclear Power Plant
- Reactor Vessel(R/V) Bolts
- Reactor Coolant Pump(RCP) Bolts
- Moisture Separator Reheater(MSR) Bolts
- Turbine Bolts
- Each Valve Bolts
Hydraulic & Thermal Power Plant
- Hydraulic Bolts
- Turbine Bolts
- Each Valve(MSV, CV, CRV) Bolts
- High Temperature & High Pr Bolts
Major Business Areas
주요업무 안내표
| Joint on Flange and Pressure Vessel |
- Integrity Evaluation according to Stress Analysis
- Re-design and Modification for Performance
|
| High Temperature Bolts |
- Safety Analysis
- Stuck Bolt Removing
|
| Bolt Design and Manufacture |
Equipment
- Ansys 6.0(Stress Analysis Program)
- Standard Stud Bolt(Wobble Test Tool)
- Boltmike(Stress Measuring for Joint Bolt)
- Laminar Drilling Machine(Boring & Tapping for Small Diameter)
- Master Milling Machine(Boring & Tapping for Large Diameter)
- Co-Ax Indicator(Centering Tool)
- Band Saw Machine(Cutting Tool)
Experiences
- Samcheonpo TP #2(GE, 560MW) Stuck Bolt Removing and MSI
- Pyeongtaek TP #4(Hitachi, 350MW) Stuck Bolt Removing and MSI
- Samcheonpo TP #1(GE, 560MW) Stuck Bolt Removing
- Boryeong TP #1(Toshiba, 560MW) Stuck Bolt Removing
- Seocheon TP #1(GE, 200MW) Integrity Evaluation and Stick Bolt Removing
- Seoul TP #5(MHI, 250MW) Stuck Bolt Removing and MSI
- Gori NP #4(WH, 950MW) Integrity Evaluation for Stud Female Threads and Heli Coil Repair
