大亚湾核电站延伸运行技术的研究与实施

Research and Implementation of Stretch-Out Operation in Daya Bay Nuclear Power Station

延伸运行(SO)是指当一回路的硼浓度接近0mg/L时,通过降温和降功率引入反应性,以保证反应堆加深燃耗继续保持功率运行,世界上许多核电厂采用SO。大亚湾核电站成功实施了我国的首次延伸运行。延伸运行作为一个特定的运行模式,需要进行相关的设计论证和安全分析。由于连续或阶跃式的降负荷和降温度,核测量系统和反应堆控制保护系统的参数需要进行特殊设置。按照发电计划的安排,大亚湾核电站的第一次延伸运行于2003年3月11日到3月20日实施,顺利实现了错开大亚湾核电站209大修和109大修的目的。

Stretch-out operation mode can deepen the reactor burnup when the boron concentration is near 0mg/L, in which the additional reactivity is introduced by the reducimg of the moderator temperature and the decreasing of the load. Stretch-out is used in many nuclear power plants all over the world. The first stretch-out operation has been used for the first time in China.. As a specific： operation mode, which outruns the original reactor core design, the related and specialized design argument and safety analysis is required. As a consequence of the continuous or stepwise reduction of load and moderator temperature, the neurotic measurement system and the reactor control and protection system parameters.; should be modified specially. Based on the schedule of the electricity production, the first stretch-out operation had been carded out from March 12 to March 21 2003. It successfully avoided the overlapping between 209 and 109 inspection shutdowns in Daya Bay Nuclear power station, and additional 30 GWH energies were produced.