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NEA-1556 IFPE/OVER-RAMP.

IFPE/OVER-RAMP, Pellet Clad Interaction Failure Analysis, Power Ramps

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1. NAME OF EXPERIMENT:  IFPE/OVER-RAMP.
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2. COMPUTERS
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Program name Package id Status Status date
IFPE/OVER-RAMP NEA-1556/02 Arrived 02-MAR-2006

Machines used:

Package ID Orig. computer Test computer
NEA-1556/02 Many Computers
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3. DESCRIPTION

The OVER-RAMP Project investigated the failure popensity of typical PWR fuel in the form of test rods when subjected to fast power ramps.
Thirty nine rods, of two different origins and designs, forming nine groups of rods in regard to variations in design and material parameters, were base irradiated in a power reactor environment(the Kernkraftwerk Obrigheim and the Mol reactor BR-3) at heat rates in the range of 14 to 25 kW/m to burnups in the range of 12 to 31 MWd/kg U and subsequently ramp tested in the research reactor R2 at Studsvik, Sweden.
The rods underwent a thorough examination program, comprising characterization prior to the base irradiation, examinations interim to base and ramp irradiations and examinations after the ramp irradiation.
The principal objective of the OVER-RAMP Project was to make a substantial contribution to the understanding of the pellet-clad interaction (PCI) for commercial type PWR reactor fuel under power ramp conditions so as to acquire greater ability to assess its potential limitations.
The main technical objectives of the OVER-RAMP Technical Program were the following:
- Establish through experiments the power ramp fuel failure threshold as a function of fuel burn-up.
- Determine the influence on the failure threshold of various design and material parameters.
- Determine the influence on the failure threshold of various ramp parameters (for fuel rods with identical sets of design parameters).
- Identify fuel failure modes and mechanisms, as well as characteristic stages of fuel failure.
- Provide data for PCI failure analysis and for predictive fuel modelling by recording changes in rod profiles, dimensions, structures, properties, etc.
Five rods were ramp tested with ramp rates lower than about 100 W/cm x min. The influence of the lower ramp rates was not conclusive.
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4. METHODS

In order to meet these objectives, much effort went into recording the power history in detail, and to determine the fuel rod changes based on a thorough pre-irradiation characterization, non-destructive examinations before and after the power ramping, and selected destructive examinations of rods following the power ramping irradiation.
The program power ramped 39 individual test fuel rods of 2 different origins and designs.
24 of the rods were of KWU/CE design and were provided by KWU. They were delivered to the Project following base-irradiation in a power reactor environment (Kernkraftwerk Obrigheim, FR Germany).
15 of the rods were of Westinghouse design and were delivered by W after irradiation in the BR-3 reactor at Mol, Belgium.
The burn-up levels ranged from 12 to 31 MWd/kgU achieved at heat ratings of 14-25 kW/m (average over time, at axial peak position).
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES
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8. RELATED OR AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
NEA-1556/02 02-MAR-2006 Arrived at NEADB
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10. REFERENCES
NEA-1556/02, included references:
- The OVER-RAMP Project
Final Report Studsvik-STOR-37
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11. HARDWARE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED

No item found

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13. SOFTWARE REQUIREMENTS
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHORS

   Studsvik Scandpower AB
   SE-611 82 NYKOEPING
   Sweden

   Compilation: J.A. Turnbull, UK
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16. MATERIAL AVAILABLE
NEA-1556/02
README.OVR Readme file (corrected in March 2006)
SUMMARY.OVR Overview of the project
OVER-R.QA QA Report
PRECHAR.KWU Pre-characterization data for the 24 KWU/CE fuel rods
PRECHAR.W Pre-characterization data for the 15 Westinghouse rods
PIE.KWU most important destructive and non-destructive PIE measurements
PIE.W destructive and non-destructive PIE measurements (Westinghouse rods)
*.KWU Irradiation histories for the 24 rods
*.W Irradiation histories for the 15 rods
STOR_37.pdf Studsvik report
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17. CATEGORIES
  • Y. Integral Experiments Data, Databases, Benchmarks

Keywords: experimental data, fuel elements, fuel rods, fuel-cladding interaction.