Intranodal burnup gradient correction in Analytic Function Expansion Nodal (AFEN) method
Conference
·
OSTI ID:459264
- Korea Advanced Institute of Science and Technology, Ysong-gu, Taejon (Korea, Republic of)
A new burnup correction model is proposed to take into account the effects of the intranodal burnup- and feedback-induced cross section variations on the neutron diffusion nodal calculation. This model homogenizes equivalently the node with cross section gradients into the homogeneous node, in accordance with the equivalence theory. This is accomplished by solving two single-node problems with the same current boundary conditions by expanding their flux solutions in fourth-order polynomials: one calculation for the node with cross section gradients and the other for the node with constant flux-weighted cross sections obtained from the former calculation. The new model was implemented in the AFEN method and its ability to treat the intranodal cross section gradients was tested on a benchmark problem. The results show that the new model eliminates almost all the errors in the nodal unknowns which are induced by the intranodal burnup gradients.
- OSTI ID:
- 459264
- Report Number(s):
- CONF-950420--
- Country of Publication:
- United States
- Language:
- English
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