areva uhp cavitation peening update · page 4 > lynchburg visit – october 13, 2016 unique...
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AREVA UHP Cavitation Peening Update
Lisa Hawkins
Business Development Manager Component Repair & Replacement
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Overview AREVA Peening Technology & Industry Update
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What is Ultra High Pressure (UHP) Cavitation Peening?
Ultra High Velocity Jet Creates pressure below that of vapor pressure in water
Cavitation Vapor bubbles form in water
Shock Waves Occur from bubble collapse at surface generating high pressures on the material
Compressive Stresses In the surface layer of material results
Video Cavitation peening is a well understood, proven process A Page 3 > Lynchburg Visit - October 13, 2016
AREVA
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Page 4 > Lynchburg Visit – October 13, 2016
Unique Technologies
UHP Cavitation peening (Patented)
Hyperbaric testing
Controlled depth abrasive jet milling
High speed ceramic machining
Selective coating removal
Precision 5-axis machining
Downhole energy tooling
Nuclear cleaning & decommissioning tooling
Customers
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UHP Cavitation Peening Surface Finish
'
Non-peened Peened with Leak Indications No Leak Indications
Cavitation peened surfaces are not adverse to NDE
> Lynchburg Visit - October 13, 2016
A AREVA
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Why AREVA Selected UHP Cavitation Peening
Compressive stress depths meet or exceed MRP requirements
No abrupt edge between peened and unpeened regions
Very tolerant to surface conditions and geometries
Very robust process with a large saturation zone
Does not require complicated tooling
No FME concerns
Safe for both personnel and component when operated within
the controlled boundaries
AREVA scored UHP Cavitation Peening as the
best mitigation process
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AREVA RV Head Peening Technology Update
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AREVA’s 1st RVH Peening Implementation Completed Successfully
Completed within a sub 30 day outage
window
Safety, HU, dose & PCE goals were all met
Headstand modifications were
implemented
seamlessly and did not affect critical path
With NRC approval, peening will provide
for inspection relief that will reduce
operating costs and dose
Cavitation Peening is a PROVEN Technology that
will Maintain Your Asset for the Life of Your Plant
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RV Head Peening All OD Surfaces
...,. Alloy 600 (nozzle): .xxx" + depth of compressive stress
+ Depth of compression eliminates flaw detection gap
...,. Alloy 82/182 (j-groove weld): .xxx" + depth of compressive stress
...,. Most adaptable process to the j-groove I nozzle geometry
AREVA's UHP Peening eliminates flaw detection gap and Depth of compressive stress exceeds MRP requirement of 0.40" A
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RV Head Peening Open Penetration IDs
...,. Nozzles without thermal sleeves (such as thermocouples, spare nozzles)
...,. > .xxx" depth of compressive stress
...,. Seal around open penetration and flood up
Depth of compressive stress exceeds MRP requirement of .010" A Page 10 > Lynchburg Visit - October 13, 2016
AREVA
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RV Head Peening ID Annulus with Thermal Sleeves
...,. Greater than .xxx" (.xx mm) depth of compression on all PWSCC susceptible CROM ID surfaces
...,. Exceeds the MRP requirement of .01 O"
...,. The only vendor that can peen the annulus without removing or modifying the thermal sleeves
AREVA's Cavitation Peening is the solution for ID surface mitigation A Page 11 > Lynchburg Visit - October 13, 2016
AREVA
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UHP Cavitation Peening Qualification
...,. The peening process effectiveness was demonstrated on full scale representative mockups at the nominal, max and min ranges of essential variables used for site implementation
+ Full scale nozzle mockups include material and geometry constraints
...,. X-ray diffraction was used to determine the residual stress on peened full scale representative mockups
+ Confirm the desired peening coverage and depth of compression has been achieved
...,. A qualification report is provided to the utility that documents how all requirement are met
+ Topical Report I Relief Request I ASME Code
Essential variable range for qualification mockups and site implementation are the same A
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Process Control and Verification
...,. Essential variables are controlled/monitored to ensure acceptable results are achieved
...,. The tooling control system records the value of each essential variable
+ The electronic data will be reviewed/verified post-process
...,. The operator has a real-time display of all essential variables
...,. If an essential variable gets outside of the qualified limits the operator is immediately alerted
In - process verification I post - process verification
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RV Primary Nozzle Cavitation Peening
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Primary Nozzle Mitigation UHP Cavitation Peening
Self-propelled tool to minimize time required to
move between nozzles
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Primary Nozzle Mitigation UHP Cavitation Peening
Low dose, remote delivery -
alleviates polar crane use
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Primary Nozzle Mitigation UHP Cavitation Peening
Typical Primary Nozzle UHP Cavitation Peening Schedule
Rx Vessel Turnover to AREVA x days
Typical 3-Loop On Component Cavitation Peening x days of RCS Primary Nozzles
Demob Equipment x day
Typical Primary Nozzle UHP Cavitation Peening Dose
Dose estimate is approximately x REM
Significant dose reduction compared to other mitigation techniques
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Peening can prevent I PWSCC, reduce risk of
flaw propogation, provide inspection
relief, and transition your plant to a 10-year
I inspection cycle - all with a proven process
A AREVA
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p.18
Primary Nozzle Mitigation Repair Contingency
Repair contingency for shallow flaws
AREVA Proprietary – Second License Renewal Delegation – October 13, 2016
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BMN Cavitation Peening
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Equipment Development OD & ID Surface Tooling
Qualified state-of-the-art tooling ready to deploy
AREVA Proprietary - Second License Renewal Delegation - October 13, 2016 p.20
A AREVA
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Typical BMN Cavitation Peening Schedule
BMN tooling and process – Qualified
Synergies with AREVA ISI inspections
Typical 3 Loop BMN peening implementation schedule:
Includes peening of ID & OD, all 50 nozzles x days on component
Depth of ID compressive stress .xxx”
Greater than .xxx” depth of OD nozzle compressive stress
exceeds .040” MRP min
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Regulatory Compliance
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Regulatory Compliance
NRC SE fully supports inspection relief for RV Head and
Primary Nozzles as defined in MRP-335R3
Safety Evaluation for MRP-335R3 has been released
Extend your RV Head inspection interval to 10 years
Extend your RV Primary Nozzle Inspection cycles to 10 years
Code Cases N-770-4 and N-729-5 are approved by ASME to
provide inspection relief for RV Head and RV Primary Nozzles
No Code Case for BMN peening
The NRC is not imposing any additional BMN inspection
requirements
Current requirement: bare metal visual examination every other refuel
outage
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Why Peen RV Heads, Primary BMN Nozzles
Mitigation prevents PWSCC initiation
Mitigation provides asset life extension through elimination of
the degradation process
Cost of cavitation peening is less than the cost of emergent
repairs
Eliminates potential for repair and outage contingency cost
AREVA exceeds the compressive stress requirements per
MRP
Mitigate now or repair/replace later