THE MODIFICATION OF FUELLING FREQUENCY AND THE USE OF BURNABLE ABSORBERS IN CANDU REACTORS
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 5: Design and Development - I

Authors:
C. Bruce (The Royal Military College of Canada)
P. Chan (Royal Military College of Canada)
H. Bonin (Royal Military College of Canada)
J. Song (The Royal Military College of Canada)
S. Paquette (The Royal Military College of Canada)
  

Abstract

As CANDU reactors age, operational margins have narrowed. Power ripples that result from the insertion of fresh fuel constantly challenge the limit of these boundaries. To address the situation, this study has altered the conventional fuelling scheme in an iterative fashion, with the addition of 8 bundle shift rings to reduce the fuelling frequency, and thus the demand on fuelling machines. Both NU and NU laced with BNAs were considered. Results indicated that both the absolute maximum channel power and LZC fill fractions were reduced when 150 mg of Gd2O3 was added to NU fuel; these findings were unanimous for the various fuelling schemes considered.

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