摘要:
与18个月换料相比,压水堆核电站24个月换料能减少大修次数,提高机组负荷因子,增加发电量。基于装载177组件的堆芯,通过提高新燃料组件富集度和增加批换料组件数使堆芯循环长度达到24个月换料周期要求,考虑实际24个月换料和名义24个月换料高低两种电厂可利用因子。考虑燃料组件费用、大修费用、乏燃料处理费用和发电收益等进行换料方案经济性分析评估,并和典型18个月换料经济性作比较。177堆芯平衡循环装载88组富集度为4.95%的燃料组件,能满足名义24个月换料循环长度的需要,组件平均卸料燃耗约48 GWd/tU；装载104个燃料组件的堆芯能满足实际24个换料循环长度的要求,堆芯参数满足相关安全限值要求。结果表明,177堆芯24个月换料具有可行性,其高负荷因子下的经济性与18个月换料相当。
Abstract:
Compared with the 18-month refueling, 24-month fuel cycle can reduce the times of overhaul, improve the load factor, and increase generating capacity. The core cycle length in a 177 assembly PWR meets 24-month refueling requirements by increasing the enrichment of the fresh fuel assemblies and the refueling fuel assembly components, considering the nominal and actual 24-month refueling. The economic evaluation was performed based on fuel management results, considering power generation revenue and cost including fuel cycle cost, refueling and overhaul cost, spent fuel storage costs. Preliminary results show that the 177-assembly PWR with 88 fresh fuel assemblies enriched at 4.95% is possible to achieve nominal 24-month refueling, and the average discharge burnup of fuel is about 48 GWd/tU. The cycle length with 104 fuel assemblies can achieve the actual 24 refueling cycle length, and neutron parameters meet the relevant safety limit requirements. It is shown that the 24-month refueling in the 177 assembly PWR is feasible, and its economy in the case of the high load factor is approximately similar with that of 18 months fuel cycle.
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