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The study introduces a novel application of a burnable poison (BP) known as Double Tube Burnable Poison (DTBP). Two design concepts of DTBP were tested in a small modular reactor (SMR) to extend the operating cycle while maintaining low soluble boron concentration. These concepts can be loaded in various locations in the fuel assembly, providing greater flexibility in nuclear design. The design's adaptability allows for an increased poison effect with the ability to control the depletion speed of its absorber materials. Combining DTBP pins with Erbia pins resulted in a flat k-infinite letdown curve and a substantial reduction in excess reactivity. DeCART2D and MASTER codes were used for assembly and core calculations. The results indicated that the DTBP and Erbia core combination achieved a cycle length exceeding 3.5 Effective Full Power Years. Furthermore, the Critical Boron Concentration was reduced to 309 ppm, staying within design limitations related to the moderator temperature coefficient and maximum pin power peaking. This option's performance surpassed that of other alternatives.
| Country OR International Organization | Libya |
|---|---|
| Email address | ayman.dandi@hotmail.com |
| Confirm that the work is original and has not been published anywhere else | YES |
