Field Machining Nuclear Services / Installation and Modification Services Background

Nuclear Services / Installation and Modification Services
Field Machining
Background
Westinghouse, through its subsidiary WEC
Equipment and Machining Solutions (WEMS),
specializes in machining projects that include
first-of-a-kind tool design, manufacturing, testing,
qualification and field deployment.
Description
Some of the specialty machining projects include:
• Alloy 600 crack
mitigation utilizing
reaming and electrical
discharge machining
(EDM)
• Flange facing
• Governor/throttle
valve machining
• Inlet sleeve repair
• Reactor vessel head
(RVH) upper head
temperature reduction
(UHTR) and upflow
using EDM
• Reactor temperature
detector (RTD)
bypass and
replacement
• Safe end replacement
• Spent-fuel canister
machining
• Steam chest
machining
• Steam generator
replacements (SGRs)
for PWRs
• Stud and thread
repair
• Superheat/re-heat
header machining
• Top hat machining
• Turbine shell
machining
• Turbine upgrade
machining/LP-HP
piping
• Valve seat repair
WEMS offers multiple approaches for severance
cutting and weld-end preparation for any size,
thickness or diameter pipe, regardless of material
type, access, hazardous field conditions or space
restrictions. WEMS uses MDM methods for stud
and bolt removal, and abrasive water-jet cutting
and plasma cutting for unique situations. EDM is
used for applications such as boat sampling and
applications requiring more precise tolerances
and/or surface finishes.
Benefits
Canister Machining: Specialized tools designed
and developed for installing canister lids, including
the weld-prep machining required.
Steam Generator Replacements: Machine weld
preparation for installing new steam generators,
including primary reactor coolant piping and
secondary piping.
In addition, WEMS has extensive field experience
and services, including:
• Abrasive water-jet
(AWJ) cutting
• Boring
• Drilling
• EDM
• Field machining
centers (FMCs)
• Flange facing
• Grinding
• Metal disintegration
machining (MDM)
• Milling
• Pipe cutting/weld
preparation
• Plasma cutting
• Reaming
Machine cutting canopy seal on mock-up
Computer Numerically Controlled (CNC) Machines:
Pipe preparation and flange-facing capabilities.
Boring: The capability to bore pumps and valves up to
70 inches in diameter.
Flange Repair/Machining: Flanges up to 10 feet in
diameter machined with a flat or phonograph finish using
the WEMS portable flange-facing machine. The restored
surfaces mate uniformly across the entire flange face,
creating uniform gasket compression and sealing forces
around the entire flange.
Stuck-stud Removal: An MDM technique using a graphite
electrode to cut out the core of the stud, followed by
another electrode to create a wide slot in the remaining
stud remnant. A tool is then used to remove the remaining
strip of material, allowing the stud remnant to be collapsed
and removed.
Completed narrow groove weld prep using Omega 9B™
EDM: Electrical discharge machining used for material
sample applications that need precise tolerances and/or
surface finishes. EDM is also a one-of-a-kind application.
AWJ Cutting: Abrasive water-jet cutting process utilizes
an ultra-high-pressure intensifier pump that pressurizes
water up to 55,000 psi. This process forces the water
through a small nozzle, typically 0.10-inch diameter, which
generates a high-velocity water-jet stream at speeds of up
to 3,000 feet per second.
Drilling: Portable, hydraulic and electric drilling systems
adapted for drilling/reaming needs. Drills can also be used
for a conventional stuck-stud removal process.
Manual pipe lathe performing counter bore operation
Milling: Portable hydraulic and electric milling systems
to adapt to any milling needs for facing, boring, reaming,
keyway cutting and custom applications.
FMC: Transportable, self-sufficient and fully tooled
machine shops, outfitted with a standard line of machinery,
including a complete inventory of common bar and round
stocks.
Custom Machining Solutions: The capability to engineer,
manufacture, test, qualify and deliver custom-machining
applications to meet customer needs.
Omega 9B™ (CNC pipe lathes) set in multiple
locations for machining steam generators
Westinghouse Electric Company
1000 Westinghouse Drive
Cranberry Township, PA 16066
www.westinghousenuclear.com
Omega 9B is a trademark or registered trademark of Westinghouse
Electric Company LLC, its affiliates and/or its subsidiaries in the United
States of America and may be registered in other countries throughout
the world. All rights reserved. Unauthorized use is strictly prohibited.
June 2015
NS-IMS-0030
©2015 Westinghouse Electric Company LLC. All Rights Reserved