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Title: High Burn-Up Spent Nuclear Fuel Vibration Integrity Study

The Oak Ridge National Laboratory (ORNL) has developed the cyclic integrated reversible-bending fatigue tester (CIRFT) approach to successfully demonstrate the controllable fatigue fracture on high burnup (HBU) spent nuclear fuel (SNF) in a normal vibration mode. CIRFT enables examination of the underlying mechanisms of SNF system dynamic performance. Due to the inhomogeneous composite structure of the SNF system, the detailed mechanisms of the pellet-pellet and pellet-clad interactions and the stress concentration effects at the pellet-pellet interface cannot be readily obtained from a CIRFT system measurement. Therefore, finite element analyses (FEAs) are used to translate the global moment-curvature measurement into local stress-strain profiles for further investigation. The major findings of CIRFT on the HBU SNF are as follows: SNF system interface bonding plays an important role in SNF vibration performance. Fuel structure contributes to SNF system stiffness. There are significant variations in stress and curvature of SNF systems during vibration cycles resulting from segment pellets and clad interactions. SNF failure initiates at the pellet-pellet interface region and appears to be spontaneous.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
OSTI Identifier:
1210132
DOE Contract Number:
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: WM2015, Phoenix, AZ (United States), 15-19 Mar 2015
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Laboratory (HTML)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; SPENT FUELS; FRACTURES; FUEL PELLETS; FINITE ELEMENT METHOD; FATIGUE; BONDING; BURNUP; FLEXIBILITY; INTERFACES; STRESSES; BENDING; FUEL-CLADDING INTERACTIONS; PERFORMANCE; STRAINS; VARIATIONS; MECHANICAL VIBRATIONS spent nuclear fuel; fuel vibration inetgrity; pellet-pellet interface; reversal bending fatigue