A passive containment cooling and filtered venting system for a nuclear power plant including: a containment vessel including: a dry well that contains a reactor pressure vessel, RPV, a wet well that contains in its lower portion a suppression pool connected to the dry well via a loss-of-coolant accident, LOCA, vent pipe and includes in its upper portion a wet well gas phase, and a vacuum breaker that is arranged to circulate gas in the wet well gas phase to the dry well, and a pedestal that supports the reactor pressure vessel in the containment vessel via a reactor pressure vessel, RPV, skirt and forms a pedestal cavity inside, an outer well that is arranged outside the dry well and the wet well, adjoins the dry well via a dry well common part wall, adjoins the wet well via a wet well common part wall, and has pressure resistance and gastightness; a scrubbing pool that is arranged in the outer well and stores water inside; a cooling water pool that reserves cooling water; a heat exchanger that includes an inlet plenum, an outlet plenum, and a heat exchanger tube, and is submerged at least in part in the cooling water; a gas supply pipe that is connected to the inlet plenum of the heat exchanger at one end and connected to a gas phase of the containment vessel at other end to lead gas in the containment vessel to the heat exchanger; a condensate return pipe that is connected to the outlet plenum of the heat exchanger at one end, passes through the outer well, and is connected to inside the containment vessel at other end to lead condensate in the heat exchanger into the containment vessel; and a gas vent pipe that is connected to the outlet plenum of the heat exchanger at one end, passes through the outer well, has other end installed and submerged in the scrubbing pool in the outer well, and is arranged to release noncondensable gas in the heat exchanger to the outer well. a containment vessel including: a dry well that contains a reactor pressure vessel, RPV, a wet well that contains in its lower portion a suppression pool connected to the dry well via a loss-of-coolant accident, LOCA, vent pipe and includes in its upper portion a wet well gas phase, and a vacuum breaker that is arranged to circulate gas in the wet well gas phase to the dry well, and a dry well that contains a reactor pressure vessel, RPV, a wet well that contains in its lower portion a suppression pool connected to the dry well via a loss-of-coolant accident, LOCA, vent pipe and includes in its upper portion a wet well gas phase, and a vacuum breaker that is arranged to circulate gas in the wet well gas phase to the dry well, and a pedestal that supports the reactor pressure vessel in the containment vessel via a reactor pressure vessel, RPV, skirt and forms a pedestal cavity inside, an outer well that is arranged outside the dry well and the wet well, adjoins the dry well via a dry well common part wall, adjoins the wet well via a wet well common part wall, and has pressure resistance and gastightness; a scrubbing pool that is arranged in the outer well and stores water inside; a cooling water pool that reserves cooling water; a heat exchanger that includes an inlet plenum, an outlet plenum, and a heat exchanger tube, and is submerged at least in part in the cooling water; a gas supply pipe that is connected to the inlet plenum of the heat exchanger at one end and connected to a gas phase of the containment vessel at other end to lead gas in the containment vessel to the heat exchanger; a condensate return pipe that is connected to the outlet plenum of the heat exchanger at one end, passes through the outer well, and is connected to inside the containment vessel at other end to lead condensate in the heat exchanger into the containment vessel; and a gas vent pipe that is connected to the outlet plenum of the heat exchanger at one end, passes through the outer well, has other end installed and submerged in the scrubbing pool in the outer well, and is arranged to release noncondensable gas in the heat exchanger to the outer well.