Eigenvalue Implicit Sensitivity to Self-Shielding Calculations in Heterogeneous Geometries
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Bibliographic record
Abstract
AbstractA method is proposed to evaluate implicit sensitivity coefficients for several types of reactor lattices, including pressurized water reactors and CANDU (CANada Deuterium Uranium) reactors, with different resonant and light isotope contents. The implicit sensitivity of the multiplication factor, resulting from a variation of an isotope density through the self-shielded cross sections, is computed for different cases. The precision of the method, the importance of the implicit coefficients with respect to the total sensitivity, and the contributions of all the isotopes are discussed and compared for the different systems. We also show how to compute the sensitivity coefficients in the unresolved energy groups, where the details of the resonances are not known. An equivalent dilution model is used for the self-shielding calculations. Complete transport calculations, using a collision probability method, are also used to compute reference values for the implicit sensitivities.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it