Transcript Argentina
International Conference on Management of Spent Fuel from Nuclear Power Reactors, Vienna, 31 May - 4 June 2010 Operating Experience and Condition Assessment of Spent Fuel Dry Storage Silos and Spent Fuel Pool at Embalse NPP Anibal Barrera Life Extension Project Embalse NPP. CONTENTS Spent Fuel Dry Storage Silos at Embalse NPP In Service Inspection Program (ISI) Condition Assessment ◦ Degradation mechanism ◦ Evaluation procedures Conclusions and future tasks Spent Fuel Pool Spent Fuel Dry Storage Silos at Embalse NPP 19901991 19921993 Design – Mock up 80 2001 2002 2003 40 • 248 SILOS • 133920 Fuel Bundles • 2013 – Refurbishment Outage 2004 2005 64 2006 2007 2008 32 2009 2010 2011 32 Spent Fuel Dry Storage Silos at Embalse NPP Spent Fuel Dry Storage Silos at Embalse NPP Concrete Type II Portland cement f`c = 21 MPa Density = 2400 kg/m3 Reinforcement Fy = 420 MPa (Grade 60) Steel Liner F 26 (ASTM A -36) In Service Inspection Program (ISI) Internal Moisture – Pressure air cleaning Aerosols and noble gases detection External Radiation Monitoring X-rays surface examination – contact dose rate Visual inspection, Corrosion analysis and thickness measurement Carbon Steel Corrosion Containment Barrier Integrity Mock up with baskets and metallic samples Degradation mechanism - Evaluation procedures Mechanism Material Manifestation E. Procedure Sulphate attack Concrete Volume Change/ Cracking Visual Insp – Petrographic A. Carbonation Concrete Carbon Steel Vulnerable to corrosion Petrographic A Carbonation depth m. CementAggregate reaction Concrete Volume Change / Cracking Visual Insp – Petrographic A. Thermal Exposure Concrete Cracking / Spalling Visual Insp – Petrographic A. Irradiation Concrete /C. steel Volume Change/ Cracking Petrographic A. Shrinkage Concrete Volume Change/ Cracking Visual Insp. Corrosion C. Steel Concrete Cracking – Section/capacity loss Visual Insp. – Electrical potential measurement Conclusions ISI tasks New ISI Program ◦ Periodic Visual inspection ◦ Non destructive testing Steel Corrosion Crack Survey Ultrasonic P.V. ◦ Destructive Testing c. quality – calibration NDT – Petrographic examination SPENT FUEL POOL LINER SYSTEM 1 - Amercoat90 (6 mil) 2 - Amercoat90 (6 mil) 3 - Amercoat90 0.15 mm (6 mil) CONCRETE 4 - Fiber-Glass Cloth with Amercoat90 0.23 mm (~9 mil) 5 - Sand Filled Epoxy Grout 1.6 - 3.2 mm (62.5 – 125 mil) SUMMARY No evidence of sign of leakage in external surfaces. No evidence of leakage in the Spent fuel Pool Under drainage System Bubbles in liner were found – Temperature and irradiation PREVENTIVE MAINTENANCE EPOXY UNDERWATER COATING Thank you for your attention!