New long-cycle small modular PWR cores using particle type burnable poisons for low boron operation
| Autor: | Hoseong Yoo, Dae Hee Hwang, Ho Choel Shin, Ser Gi Hong |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
business.industry 020209 energy Mechanical Engineering Shutdown Nuclear engineering Pressurized water reactor chemistry.chemical_element 02 engineering and technology Structural engineering Atomic packing factor Rod Coolant law.invention Small modular reactor Core (optical fiber) Nuclear Energy and Engineering chemistry law 0202 electrical engineering electronic engineering information engineering General Materials Science Safety Risk Reliability and Quality Boron business Waste Management and Disposal |
| Zdroj: | Nuclear Engineering and Design. 314:173-181 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/j.nucengdes.2017.01.020 |
| Popis: | In this paper, new small long-cycle PWR (Pressurized Water Reactor) cores for low boron concentration operation are designed by employing advanced burnable poison rods (BPRs) in which the BISO (Bi-Isotropic) particles of burnable poison are distributed in a SiC matrix. The BPRs are designed by adjusting the kernel diameter, the kernel material and the packing fraction to effectively reduce the excess reactivity in order to reduce the boron concentration in the coolant and achieve a flat change in excess reactivity over a long operational cycle. In addition, axial zoning of the BPRs was suggested to improve the core performances, and it was shown that the suggested axial zoning of BPRs considerably extends the cycle length compared to a core with no BPR axial zoning. The results of the core physics analyses showed that the cores using BPRs with a B 4 C kernel have long cycle lengths of ∼4.5 EFPYs (Effective Full Power Years), small maximum CBCs (Critical Boron Concentration) lower than 370 ppm, low power peaking factors, and large shutdown margins of control element assemblies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect