دورية
Optimization Method of Rod-Type Burnable Poisons for Nuclear Designs of HTGRs
| العنوان: | Optimization Method of Rod-Type Burnable Poisons for Nuclear Designs of HTGRs |
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| المؤلفون: | YAMASHITA, Kiyonobu |
| المصدر: | Journal of Nuclear Science and Technology; September 1994, Vol. 31 Issue: 9 p979-985, 7p |
| مستخلص: | In block-type HTGRs, control rod insertion depths into cores had to be maintained as small as possible at full power operations, to avoid a fuel temperature rise. Thus, specifications (poison atom density (NBP) and radius (r)) of rod-type burnable poisons (BPs) had to be optimized so that the effective multiplication factor (keff) would be constant at a minimum value throughout a planned burnup period.However, the optimization had been a time-consuming work until now since survey calculations had to be done for most possible combinations of: NBPand r. To solve this problem, I have found a optimization method consisting of two steps. In the first step, approximation formulas describing a time-dependent relation among effective absorption cross sections (NBP), JVBP and r are used to select promising combinations of A/BP and rbeforehand. In the second step, the best combination of: NBPand ris determined by a comparison between σaBPof each promising combination and expected one. The number of survey calculations was reduced to about 1/10 by the optimization method. The change in leff for 600 burnup days was reduced to 2%δkby the method. Hence, it was made possible to operate reactors practically without inserting the control rods into cores. |
| قاعدة البيانات: | Supplemental Index |
PDF full text from Publisher | تدمد: | 00223131 18811248 |
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| DOI: | 10.1080/18811248.1994.9735248 |