American Nuclear Society
Home

Home / Store / Journals / Electronic Articles / Nuclear Technology / Volume 128 / Number 1 / Pages 35-45

Fuel Element Burnup Determination in Mixed TRIGA Core Using Reactor Calculations

Matjaz Ravnik, Tomaz Zagar, Andreja Persic

Nuclear Technology / Volume 128 / Number 1 / Pages 35-45

October 1999

Format:

Price:$30.00
Member Price:$27.00
Member Savings:$3.00

Calculations of fuel element burnup for realistic mixed core conditions in a 250-kW TRIGA Mark II reactor are presented. Two types of fuel elements are considered: 70% enriched FLIP and 20% enriched standard fuel elements. Two calculation models are compared. The first is based on a one-dimensional two-group diffusion approximation (the TRIGAP computer code), and the second is based on a two-dimensional four-group diffusion equation (the TRIGLAV computer code). In both cases the unit-cell group constants are generated with the WIMS code. Results of the calculations are intercompared to evaluate the influence of the two-dimensional effects on fuel element burnup. The following two-dimensional effects are considered: mixed rings, in-core water gaps, vicinity of control rods, and asymmetric core loading patterns. Relative differences in fuel element burnup of 10% on average and up to 80% in extreme cases are observed because of the two-dimensional effects. The accuracy of the calculation is estimated also by comparing the calculated results to the measurements using the reactivity method.

 
 
 
Questions or comments about the site? Contact the ANS Webmaster.
advertisement