MITIGATION OF END FLUX PEAKING IN CANDU FUEL BUNDLES USING NEUTRON ABSORBERS
39th Annual CNS-CNA Student Conference - 2015 June 01


Presented at:
39th Annual CNS-CNA Student Conference
2015 June 01
Location:
Toronto, Canada
Session Title:
Student Session

Authors:
D. Pierce (Royal Military College of Canada)
P. Chan (Royal Military College of Canada)
W. Shen (Canadian Nuclear Safety Commisson)
  

Abstract

The end-flux peaking (EFP) is a phenomenon where a region of elevated neutron flux occurs at the end regions between two adjoining fuel bundles in CANDU reactors. These peaks of high neutron flux lead to an increase in fission rate and therefore greater heat generation in the end regions. This increase in heat generation is of particular concern during accident conditions. It is known that addition of neutron absorbers into fuel bundles can help mitigate EFP, yet their implementation in CANDU reactors using natural-uranium fuel has not been pursued. Monte Carlo N-Particle code (MCNP) 6.1 was used to simulate the addition of a small amount of neutron absorbers strategically at the bundle ends. The model includes two half bundles with a single end region, with varying amounts of Eu2O3 within the last two pellets. This paper will present some preliminary results collected thus far.

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