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Electrical Cable Aging and Condition Monitoring Codes and Standards for Nuclear Power Plants. Electrical Cable Task Group (ECTG) NESCC Update: 7 November 2013 Co-Chairs: Dr. Stephanie Watson, NIST Dr. Corey McDaniel, R-SCC. ECTG Scope. Objectives:

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slide1

Electrical Cable Aging and Condition Monitoring Codes and Standards for Nuclear Power Plants

  • Electrical Cable Task Group (ECTG)
  • NESCC Update: 7 November 2013
  • Co-Chairs:
  • Dr. Stephanie Watson, NIST Dr. Corey McDaniel, R-SCC
ectg scope
ECTG Scope

Objectives:

  • Inventory of relevant standards with gaps and overlaps analysis.
  • Recommendations for revisions or new electrical cable standards.
  • Review of current citations of electrical cables codes and standards in NRC regulatory documents.
  • Short, Medium, and Long-term Recommendations
status and path forward
Status and Path Forward
  • July:
    • Added task group co-chair from industry.
    • Draft report submitted to Steering Committee for review and comment.
    • Task group co-chair facilitating review and update of draft report by industry.
  • October:
    • Draft final report to NRC and DOE for final comments
  • November:
    • Publication.
slide4

RECOMMENDATIONS

    • Short-Term Actions (<3 year)
  • Revise RG 1.89 Revise RG 1.189
  • NRC provide guidance on RG 1.1.31
  • Cable aging studies
  • Research on adequacy of cable characterization techniques
  • Low smoke zero halogen research
    • Medium-Term Actions (3 to 8 years)
  • Revise RG 1.218
  • Research on water submergence
  • Research on activation energy
  • Definitions of low and medium voltage
    • Long-Term Actions (> 8 years)
  • Correlation between accelerated exposure and natural aging conditions
slide5

EMERGING ISSUES: Korea

  • Background
  • June 2013 – NSSC reveals cable falsifications, 4 reactors shutdown
  • More than 100 officials have been indicted to date; KHNP CEO, Minister
  • Reactor head cables removed and replaced using domestic supplier
  • Cable in two new reactors was “re-tested” – APR-1400 (UAE ref. plants)
  • Testing conducted in October – cables failed flame tests, must be removed
  • KHNP issues ITB two days later; 20 KHNP executives dismissed
  • 2 U.S. companies are the only invited bidders (domestic not allowed)
  • Bids accepted last Friday (1 November); award expected 2-3 weeks
  • Implications
  • Korea used IEEE to “re-test” cables; are “re-test procedures” needed?
  • Will cables at other reactors be re-tested as a result of Korea?
  • Will re-testing expand beyond Korea?
  • Research implications of re-testing, beyond condition monitoring?
gaps in research and standards
Gaps in Research and Standards

Existing NPPs

  • Cable Aging Studies
    • Accelerated aging and extrapolation to 60 years
      • Thermal and radiation sequence
      • Diffusion limited oxidation
  • Water Submergence and its Effects
    • Medium versus low voltage
  • Activation Energy Determination
  • Adequacy of Cable Characterization Techniques
    • Destructive versus non-destructive
    • Line Resonance Analysis (LIRA)
      • Low voltage cable applications; SDOs need to develop a method
      • Currently used in NPPs (I&C, power), T&D, Wind Parks (on/offshore), Process Industry, Oil and Gas Industry (above ground, underground, submarine, umbilical cables), Cable Manufacturers (reference measurements, QC)
    • Joint Time and Frequency Domain Reflectometry
    • Cable field tests for non-shielded cables (5 kV and above)
  • Universal procedure for walk-downs of cable installations
gaps in research and standards1
Gaps in Research and Standards

New NPPs

  • Qualification testing on low smoke zero halogen cables
  • Performance correlation between fast non-oxidative diffusion limited oxidation controlled exposure (IEEE 323) with oxidatively driven materials degradation for long term plant normal operation (low dose radiation and low temperature)
  • Commonly accepted definitions of low and medium (action for SDOs)