数字化反应堆保护系统目前已广泛应用于核电机组.作为执行核电厂重要安全功能的反应堆保护系统在核电厂正常运行期间对其可用性有严格的要求与限制.在机组大修期间，反应堆保护系统由于自身维护和机组状态原因存在退出运行和重新投入运行的情况，由于反应堆保护控制的设备和联锁信号众多，为确保不出现设备误动和人员伤害，需要针对性地制定相应的退出和投入方案.早期的模拟系统中大量使用继电器，在反应堆保护系统的投退中需要大量的拆接线工作，在使用数字化反应堆保护系统后，减少了现场维护人员的工作量.对目前国内核电厂反应堆保护系统退出和投入方案进行分析，通过对反应堆保护系统和设备的优化设计，提高维护系统的自动化水平，减少反应堆保护系统的投入和退出的工作量，提高工作效率，降低人因失误风险，以降低因为保护系统投入与退出带来的核电厂设备损坏和人员伤害风险.

Digital reactor protection systems are currently widely used in nuclear power plants (NPP). The reactor protection systems, which perform important safety functions of nuclear power plants, have strict requirements and restrictions on their availability during normal operation of nuclear power plants. During the commissioning or overhaul of NPP, the reactor protection system is always out of service and in service. Due to the large number of equipment and interlock signals controlled by the reactor protection system, in order to ensure that equipment malfunction and personnel injury do not occur, it is necessary to formulate the out-of-service and in-service schemes. In the early reactor protection system using a large amount of analog circuit module and relays, the commissioning and maintenance personnel required a large number of disconnection and wiring work when performing reactor protection system out of service and in service. After using the digital reactor protection system，the workload of field maintenance personnel is reduced, there are still potential human error risks and potential risks in system design. This paper analyzes the current exit out-of-service and in-service schemes for reactor protection systems in domestic nuclear power plants and improves the automation level of maintenance systems by optimizing the design of reactor protection systems and equipment. The research reduces the workload and improves the work efficiency in order to reduce the risk of damage to the nuclear power plant equipment or personal injury caused by the reactor protection system out-of-service and in-service work.