First physical start-up method for pressurized water reactor without external neutron source

The invention belongs to the technical field of reactor engineering design and operation and in particular relates to a first physical start-up method for a pressurized water reactor without an external neutron source. The invention aims to provide a physical start-up method without an external neutron source aiming at the defects in the prior art, so that the reactor can safely and effectively reach a critical state. The first physical start-up method for the pressurized water reactor without the external neutron source comprises the following steps: 1, designing a high-leakage core loading pattern; 2, determining an appropriate positive reactivity introduction rate; 3, selecting a neutron flux measurement device of high precision and sensitivity; 4, strictly limiting clean water isolation measures; 5, continuous boric acid concentration monitoring; and 6, strictly setting and controlling the constant value of a protection system. 本发明属于反应堆工程设计及运行技术领域，具体涉及种压水堆无外加中子源的首次物理启动方法；本发明的目的是，针对现有技术不足，提供种无外加中子源的物理启动方法，