In the multistage process, part of the decisions are separated from the remaining decisions by means of an internal optimality condition. This condition is either (1) minimum power form factor or (2) maximum fuel burn-up with limited power form factor. The external decisions regarding the power form factor at which the reactor is wanted to be operated, the number of the N concentric regions refuelled per cycle, and the enrichment of the reload fuel, are assumed given. The model is a one-dimensional, one-group model. The state of the fuel is described by the quantfty Q = £ (k„-l) - DB . The regions with lowest Q are refuelled. Fuel shuffling is performed as a synthesis of a "best fit" of the actual Q-distribution to an ideal Q-distribution, applied as a reference distribution. The ideal Q-distribution corresponding to a specific internal optimality condition is determined at equilibrium core conditions by simple iterative methods. The automated shuffling methods work without support from flux calculations. An absorber power shaping routine keeps the power shape
fixed at the ideal shape.
|Place of Publication||Roskilde, Denmark|
|Publisher||Risø National Laboratory|
|Number of pages||133|
|Publication status||Published - 1971|
|Series||Denmark. Forskningscenter Risoe. Risoe-R|
- Risø report 232