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!