Investigation of coupling dependence of operating parameters on burnup credit of spent fuel for nuclear reactors
| Autor: | Wu, Shang-Chien, 吳尚謙 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 This study aims to investigate the influence of coupling dependence between operating parameters on the burnup credit criticality safety analysis for PWR, BWR, and HTGR spent nuclear fuels. Burnup credit is of vital importance in the criticality safety analysis due to the fact that it can improve the capacity of storage system and subsequently reduce the cost and the risk of storage system. All the calculations were carried out using SCALE6.1.3 and MCNP6.1 Monte-Carlo simulation codes associated with ENDF/B-VII neutron cross section data libraries. In each type of reactors, two geometrical models were established in order to implement the depletion calculations and criticality calculations. In general, the change of operating parameters will induce a reactivity deviation (∆k) due to the variations in the depletion rates of fissile materials as well as the production rates of plutonium, fission products, or other actinides. In convenience, this study defined the effects of simultaneous variations in one and multiple operating parameters on the effective multiplication factor (keff) as the so-called single and compound effects, respectively. Notably, ∆k resulting from compound effects is not always a simple summation of ∆k’s resulting from the associated single effects. This phenomenon may influence the precise assessment of burnup credit to some extent. Furthermore, this study investigated the influences not only on the magnitudes of ∆k’s but also the neutron energy spectrum due to either single or compound effects. The mechanisms causing each single and compound effect were studied in depth as well. Finally, this study concluded the importance of the compound effects in nuclear spent fuel storage for future research or nuclear industrial applications. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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