HIGH - TEMPERATURE BUNDLE DEFORMATION EXPERIMENTS UNDER CONDITIONS APPLICABLE TO LBLOCA WITH ECI AVAILABLE
13th International Conference on CANDU Fuel - 2016 Aug. 15-18


Presented at:
13th International Conference on CANDU Fuel
2016 Aug. 15-18
Location:
Kingston, ON Canada
Session Title:
Session 14: Safety and Operational Margin Improvement - LOCA

Authors:
F. Abbasian (Stern Laboratories Inc.)
G. Hadaller (Stern Laboratories Inc.)
R. Fortman (Stern Laboratories Inc.)
R. Hayes (Stern Laboratories Inc.)
  

Abstract

A high temperature bundle deformation experiment was performed in Stern Laboratories to investigate the bundle behavior under conditions applicable to LBLOCA with ECI available. A bundle comprised of seven CANDU fuel elements was used in the experiment. A self-contained test loop was constructed to perform the simulations under pressures up to 2 MPa in saturated steam environment. The bundle was heated by directly passing electrical current through it and real-time planar element deflections were measured using two Linear Variable Displacement Transducers at each point of interest. Four different tests were performed, each one using a unique power profile. The peak power values were gradually increasing to account for conditions applicable to AOO, and eventually LBLOCA. At the LBLOCA nominal condition, a maximum power value of 64 kW was applied, which caused maximum and local heat-up rates around 64 and 56 °C/s, respectively, a local sheath peak temperature of 950 °C, and a high-temperature (>800 °C) duration above 30 seconds. The transient displacement profiles indicate a sag-type deformation with a magnitude of ~1 mm at midspan between the bearing pad planes. The post-test inspection revealed that the bundle remained intact and that the elements exhibited a sag-type deformation consistent with the transient deflection data. The temperature-deflection correlations and analyses were obtained from the test data.

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