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Title: Mesos-scale modeling of irradiation in pressurized water reactor concrete biological shields

Neutron irradiation exposure causes aggregate expansion, namely radiation-induced volumetric expansion (RIVE). The structural significance of RIVE on a portion of a prototypical pressurized water reactor (PWR) concrete biological shield (CBS) is investigated by using a meso- scale nonlinear concrete model with inputs from an irradiation transport code and a coupled moisture transport-heat transfer code. RIVE-induced severe cracking onset appears to be triggered by the ini- tial shrinkage-induced cracking and propagates to a depth of > 10 cm at extended operation of 80 years. Relaxation of the cement paste stresses results in delaying the crack propagation by about 10 years.
 [1] ;  [2]
  1. ORNL
  2. Idaho National Laboratory (INL)
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Conference: 9th International Conference on Fracture Mechanics for Concrete and Concrete Structures, Berkeley, CA, USA, 20160529, 20160601
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
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Country of Publication:
United States
irradiation; concrete; numerical model; meso-scale; neutron; swelling; damage