Analysis of small leakage accident of lost nuclear island train B 48 V DC power superimposed steam generator heat transfer tube

Using CP600 full-scope simulator of Qinshan II Nuclear Power Plant to simulate the small leakage accident of heat transfer tube of steam generator superimposed with loss of train B 48 V DC power supply under typical working conditions, it is found that the impact of loss of train B 48 V DC power supply on the treatment of small leakage accident of heat transfer tube of steam generator is far beyond expectation. The consequences of the accidents are analyzed one by one, and the solutions are put forward. When dealing with the superimposed accidents, the operation shifts should be able to accurately extract the critical path of multiple incident-oriented accident regulations. (author)