大亚湾核电站从第九循环开始由年换料向18个月换料转换，使得原堆芯热工水力设计不再适用。
GNPS begins to implement the 18-month fuel cycles from the initial annual reload at cycle 9, thus the initial core thermal hydraulic design is not valid any more.
混合堆芯的热工水力设计是一项关系到核安全和可靠生产的重要内容。
Mixed core compatibility is one of important issues affecting the nuclear safety and the reliable generation of a nuclear Power Plant.
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