Passive pressurized water reactor containment pressure relief system

The invention discloses a passive pressurized water reactor containment vessel pressure relief system, which comprises at least two units, a pressure relief device and a residual heat removal device, and is characterized in that each unit is correspondingly provided with at least one first containment vessel; a containment of one unit is communicated with a first containment of another unit through a pipeline, the pressure relief device is arranged on the pipeline to control opening and closing of the pipeline, and a preset trigger threshold value of the pressure relief device is in positive correlation with rated design pressure of the first containment. The waste heat removal device is arranged on a first containment vessel of the unit, and the waste heat removal device is connected with the first containment vessel so as to guide out heat of the first containment vessel. The passive pressurized water reactor containment pressure relief system provided by the invention has the advantages of flexible configu