Presentation on theme: "Electrical Cable Aging and Condition Monitoring Codes and Standards for Nuclear Power Plants Electrical Cable Task Group (ECTG) NESCC Update: 7 November."— Presentation transcript:
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, NISTDr. Corey McDaniel, R-SCC
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 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.
RECOMMENDATIONS Short-Term Actions (<3 year) Revise RG 1.89 Revise RG NRC provide guidance on RG Cable aging studies Research on adequacy of cable characterization techniques Low smoke zero halogen research Medium-Term Actions (3 to 8 years) Revise RG 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
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 1.Cable Aging Studies a.Accelerated aging and extrapolation to 60 years i.Thermal and radiation sequence ii.Diffusion limited oxidation 2.Water Submergence and its Effects a.Medium versus low voltage 3.Activation Energy Determination 4.Adequacy of Cable Characterization Techniques a.Destructive versus non-destructive b.Line Resonance Analysis (LIRA) i.Low voltage cable applications; SDOs need to develop a method ii.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) c.Joint Time and Frequency Domain Reflectometry d.Cable field tests for non-shielded cables (5 kV and above) 5.Universal procedure for walk-downs of cable installations Existing NPPs
Gaps in Research and Standards 1.Qualification testing on low smoke zero halogen cables 2.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) 3.Commonly accepted definitions of low and medium (action for SDOs) New NPPs