Pressure relief device and spent fuel pool pressure relief control method

The invention discloses a pressure relief device and a spent fuel pool pressure relief control method, and relates to the technical field of nuclear power, the pressure relief device comprises a first pressure relief assembly and a second pressure relief assembly, the first pressure relief assembly comprises a first pressure relief branch and a first control valve, and the first control valve is arranged on the first pressure relief branch and can be controlled to be opened; the second pressure relief assembly comprises a second pressure relief branch and a rupture disk, the second pressure relief branch is connected with the first pressure relief branch in parallel, the rupture disk is arranged on the second pressure relief branch, the tail end of the first pressure relief branch and the tail end of the second pressure relief branch are both communicated with the outside, and the rupture disk is configured to be capable of being pressed to be opened when the first control valve fails to be opened. According