Skip to Main Page ContentSkip to SearchSkip to Site Map NavigationSkip to Footer Links

            - Home

            - FAQ
            - Glossary
            - Facility Locator
            - What's New
            - Site Help
            - Index A-Z
            - Contact Us
            - Browse Aloud
            - Email Updates

Report a Safety Concern

          - Nuclear Reactors  - Power Reactors
- Research & Test Reactors
- Operating Reactors
- Operator Licensing
- New Reactors
- Advanced Reactors
- Operator Licensing for New Reactors
- Nuclear Reactor Quick Links
 
          - Nuclear Materials  - Special Nuclear Material
- Source Material
- Byproduct Material
- Med, Ind, & Academic Uses
- Source Materials Facilities
- Uranium Recovery
- Fuel Cycle Facilities
- Materials Transportation
- Nuclear Materials Quick Links
 
          - Radioactive Waste  - Low-Level Waste
- Waste Incidental to Reprocessing
- High-Level Waste
- Uranium Mill Tailings
- Low-Level Waste Disposal
- High-Level Waste Disposal
- Storage of Spent Nuclear Fuel
- Transporation of Spent Nuclear Fuel
- Radioactive Waste Quick Links
 
          - Nuclear Security  - Domestic Safeguards
- Information Security
- Radioactive Material Security
- Contact Us
 
          - Public Meetings & Involvement  - The NRC Approach to Open Government
- About Meetings Open to the Public
- Conferences & Symposia
- Documents for Comment
- Facilitating Stakeholder Involvement
- NRC Information Quality Guidelines
- Subscribe to E-mail Updates
- Commission Schedule
- Public Meeting Schedule
 
          - NRC Library  - Basic References
- Document Collections
- ADAMS Public Documents
- Public Document Room
- Get Copies of Documents
- FOIA & Privacy Act Requests
- Photos & Video
- Records Management 
- Withholding of Sensitive Information
- FAQ Index
- HLW Licensing Network
- Adjudications (Hearings)
 
          - About NRC  - The Commission
- Governing Legislation
- Plans, Budget, & Performance
- Organization & Functions
- Locations
- History
- Values
- Direction-Setting & Policymaking
- Radiation Protection
- Fire Protection
- How We Regulate
- Emergency Preparedness & Response
- Public Affairs
- Congressional Affairs
- International Programs
- State & Tribal Programs
- Alternative Dispute Resolution Programs
- Employment Opportunities
- Contracting Opportunities
- Grant Opportunities
- Civil Rights
 

PrintShare

Email

Print

TwitterFacebookMySpace

DelicousStumbleDigg

More...

HomeNRC LibraryDocument          CollectionsNUREG-Series          PublicationsPublications          Prepared by NRC Contractors

# Crack Growth Rates in a PWR Environment of Nickel Alloys from the Davis-Besse and       V.C. Summer Power Plants (NUREG/CR-6921)						

On this page:
                - Publication Information
                - Abstract

Download complete document

*This page includes links to files in non-HTML format. See Plugins, Viewers, and Other Tools for  more information.*

                - NUREG/CR-6921
                Introductory Pages (PDF - 340 KB)
- Chapter 1 - 3 (PDF - 3.70 MB)   Chapter 4 (PDF - 8.75 MB)Chapter 5 (PDF - 615 KB)
- Chapter 6 (PDF - 52 KB)  References (PDF - 111 KB)Form 335  (PDF - 108 KB)

## Publication Information

**Manuscript Completed: November 2005      Date Published: November 2006**

Prepared by      B. Alexandreanu, O. K. Chopra and W. J. Shack

Argonne National Laboratory        9700 South Cass Avenue        Argonne, IL 60439      

W.H. Cullen, Jr.,  NRC Project Manager      

Prepared for        Division of Fuel, Engineering and Radiological Research         Office of Nuclear Regulatory Research        U.S. Nuclear Regulatory Commission        Washington, DC  20555-0001        NRC Job Code Y6388 

Availability         Notice

## Abstract

In light water reactors (LWRs), vessel internal components made of nickel–base alloys aresusceptible to environmentally assisted cracking. A better understanding of the causes and more effectivemechanisms of this cracking may permit more accurate assessments of damage accumulation andrequirements on inspection intervals. A program is under way at Argonne National Laboratory toevaluate the resistance of Ni alloys and their welds to environmentally assisted cracking in simulatedLWR coolant environments. This report presents crack growth rate (CGR) results for the followingnickel alloys tested in a simulated LWR environment: Alloy 600 removed from the Davis–Besse controlrod drive mechanism nozzle #3, Alloy 182 from a J–groove weld nozzle #11 from Davis–Besse, andAlloys 182 and 82 from a hot–leg nozzle–to–pipe weld of the V.C. Summer reactor coolant system. Theresults from the present study are compared with the existing CGR data for Ni alloys to determine therelative susceptibility of these particular heats of material to environmentally enhanced cracking. Undercyclic loading, the Alloy 600 nozzle exhibited significant environmental enhancement, but little or noenvironmental enhancement was evident for the weld alloys from both Davis-Besse and V.C. Summer.Under constant load, the CGRs of the Alloy 600 nozzle are a factor of 4–8 higher than the median CGRsbased on all the available data for Alloy 600 materials. This material exhibited predominantlyintergranular fracture, even during precracking under cyclic loads. For both the Davis-Besse andV.C. Summer weld alloys, the CGRs under constant load are lower than those predicted by the dispositioncurve proposed for Alloy 182 weld metals.

*Page Last Reviewed/Updated Sunday, March 13, 2011*

#### Home

                - News Releases
                - Event Reports
                - ADAMS
                - Open Gov
                - Students & Teachers
                - Photos & Video

#### About Us

                - Strategic Plan
                - Budget & Performance
                - Perf & Accountability Rept
                - History of the NRC
                - Employment
                - NRC Ethics
                - Agency Status

#### Popular Documents

                - Info Digest
                - Factsheets & Brochures
                - Forms
                - Electronic Submittals
                - NRC Reports – NUREG
                - NRC Regulations – 10-CFR
                - Inspection Reports

#### Follow Along

                - Blog
                - RSS

Regulations.govUSA.govExpectMore.govRecoveryFOIANo Fear EEOInspector GeneralSite MapAccessibilityPrivacy PolicySite DisclaimerFor Employees