田湾核电站18个月换料燃料管理策略

为实现田湾核电站1、2号机组长周期换料项目，制定了过渡到18个月换料的燃料管理策略。参考俄罗斯核电站管理经验，长周期换料项目需采用TVS-2M新型燃料组件。在正式向长周期燃料循环过渡前通过TVS-2M先导组件运行验证了混合堆芯相容性。TVS-2M组件入堆替换AFA组件将分成两个阶段，即前两个过渡循环装入带有包覆层的TVS-2M组件，后继循环装入不带包覆层的TVS-2M组件。田湾核电站两台机组经历4个过渡循环，逐步延长运行时间，最终达到480 EFPD的循环长度。过渡循环和平衡循环均采用部分低泄漏堆芯装载，降低了对反应堆压力容器的中子辐照。田湾核电站18个月换料燃料管理策略提高了机组能力因子和经济性并具有灵活的循环长度。

Fuel Management Scheme on 18 Months Refueling for Tianwan Nuclear Power Station

To realize long period refueling for Tianwan Nuclear Power Station (TNPS) units 1 and 2, the fuel management scheme on transition to 18 months refueling was worked out. Referring to management experience in Russian nuclear power station, the long period refueling project shall adopt the new type fuel assembly TVS-2M. Before formal transition to long period fuel cycle, the mixed core compatibility was verified by the operation of pilot TVS-2M fuel assemblies. TVS-2M fuel assemblies replaced AFA fuel assemblies in two steps, namely, TVS-2M with blanket was loaded in the first two transition cycles, and TVS-2M without blanket was loaded in the subsequent cycles. The two TNPS units are scheduled to gradually increase operation length and finally reach 480 effective full-power day (EFPD) in four transition fuel cycles. Transition fuel cycles and equilibrium fuel cycles were all designed to adopt the part-low-leakage core fuel loading, which can reduce neutron irradiation to reactor pressure vessel. Fuel management schemes on 18 months refueling for TNPS enhance units capacity factor and economy, and have flexible cycle length.