Technology
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2026-07-29 22:07
Specialized Technology
High-Temperature and High-Pressure Bolt Diagnosis & Manufacturing
Long-term use of high-temperature bolts may cause tilting and centerline shifting at threaded fastening areas due to fatigue and aging-related thermal degradation.
When excessive damage occurs to stud internal threads due to internal seizure or the intrusion of foreign substances, KEPCO KPS secures bolt integrity by applying the MSI, Mushroom Stud Installation, maintenance method after conducting integrity diagnosis and evaluation.
In addition, KEPCO KPS has established a comprehensive maintenance system for the design and manufacturing of large high-temperature bolts, providing customers with a high-quality management system.
Major Services
Target Items
-
Nuclear Power
- Reactor Vessel, R/V, bolts
- Reactor Coolant Pump, RCP, bolts
- MSR bolts
- Turbine bolts
- Various valve bolts
-
Hydro and Thermal Power
- Hydraulic turbine bolts
- Turbine bolts
- Various valve bolts, including MSV, CV, and CRV
- Other high-temperature and high-pressure bolts
Service Scope
- Integrity assessment
- Drawing preparation
- Machining
- Heat treatment
- Various quality inspections, including nondestructive evaluation
- Various tests, including hardness testing and material property testing
- Manufacturing
Equipment
01
Major Equipment
- Master Milling Machine LC-5
- Laminar Milling Machine No. 1, No. 5, and No. 5(developed product)
- Co-Ax Indicator
02
Accessory Equipment
- Index Attachment
- Narex Boring Head
- Spaider Holder & Cutter
- Band Saw Machine Drill & Tap Bushing
- Counter Bore Cutter
03
2 of Dedicated Transport Containers
Major Project
- Samcheonpo Unit 2: Stick Bolt Removal, 149 bolts, and MSI Work, 5 bolts
- Seocheon Unit 1: Stick Bolt Removal, 2 bolts
- Pyeongtaek Unit 4: Stick Bolt Removal, 110 bolts, and MSI Work, 36 bolts
- Samcheonpo Unit 1: Stick Bolt Removal, 151 bolts