北方某核电厂升功率物理试验优化的论证及实施

在核电厂反应堆换料后提升堆芯功率的物理试验中,在不同的功率平台氙浓度的分布需要等待24h才能稳定。随着软件的升级,已经可以计算氙毒未稳定情况下的理论数据库。本文采用SCIENCE软件对不同功率平台不同运行时间间隔的通量图试验结果进行模拟计算,理论分析表明,机组在功率平台稳定6h进行物理试验是满足安全要求的。根据该电厂1号机组第4循环首次启动物理试验的结果进行分析比较,得出结论:在不同的功率平台,堆芯连续稳定运行6h后,进行通量图测量试验是可行的。

Demonstration and Implementation of Optimization of Power Escalation Physics Tests for North Nuclear Power Plant

During the period of reloading startup physics tests of Nuclear Power Plant in which the core power is enhanced to the state of full power step by step, it usually takes 24h for xenon to reach equilibrium. With the software upgraded, it''s possible to calculate the theory database in the cases of unstable states of xenon poisoning already. The software of SCIENCE has been used to simulate the results of flux map in conditions of different power steps and different time intervals in this article. It indicates theoretically that the results of physics tests can meet the security requirements when the physics tests are performed after the plant unit being stabled for 6h. According to the analysis based on comparison between the simulated results and measurement datum provided by the cycle 4 of unit 1 of the plant , it is further pointed out that the measurement after 6h continuous operation at different step is feasible.