Compound effects of operating parameters on burnup credit criticality analysis in boiling water reactor spent fuel assemblies
| Autor: | Jenq-Horng Liang, Der-Sheng Chao, Shang-Chien Wu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
020209 energy Nuclear engineering Effective Multiplication Factor Nuclear data Nuclear Criticality Safety Analysis 02 engineering and technology lcsh:TK9001-9401 Spent nuclear fuel BWR Failure mode effects and criticality analysis Nuclear Energy and Engineering 0202 electrical engineering electronic engineering information engineering lcsh:Nuclear engineering. Atomic power Data library Boiling water reactor Degree of a polynomial Compound Effects Burnup Credit Burnup |
| Zdroj: | Nuclear Engineering and Technology, Vol 50, Iss 1, Pp 18-24 (2018) |
| ISSN: | 1738-5733 |
| Popis: | This study proposes a new method of analyzing the burnup credit in boiling water reactor spent fuel assemblies against various operating parameters. The operating parameters under investigation include fuel temperature, axial burnup profile, axial moderator density profile, and control blade usage. In particular, the effects of variations in one and two operating parameters on the curve of effective multiplication factor ( k eff ) versus burnup ( B ) are, respectively, the so-called single and compound effects. All the calculations were performed using SCALE 6.1 together with the Evaluated Nuclear Data Files, part B (ENDF/B)-VII238-neutron energy group data library. Furthermore, two geometrical models were established based on the General Electric (GE)14 10 × 10 boiling water reactor fuel assembly and the Generic Burnup-Credit (GBC)-68 storage cask. The results revealed that the curves of k eff versus B , due to single and compound effects, can be approximated using a first degree polynomial of B . However, the reactivity deviation (or changes of k eff , Δ k ) in some compound effects was not a summation of the all Δ k resulting from the two associated single effects. This phenomenon is undesirable because it may to some extent affect the precise assessment of burnup credit. In this study, a general formula was thus proposed to express the curves of k eff versus B for both single and compound effects. |
| Databáze: | OpenAIRE |
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