Isolation condenser systems for very simplified boiling water reactors

A nuclear reactor power plant for commercially generating electricity, the plant comprising:

• a maximum 1000 megawatt-thermal rated boiling water nuclear reactor having a height that exceeds its width by a factor of at least 3.9;
• a containment completely and impermeably surrounding the nuclear reactor, wherein there is no open coolant source or active pump inside the containment, and wherein the containment is completely underground;
• at least one primary coolant loop connecting to the nuclear reactor through the containment;
• an isolation condenser system outside the containment and connecting to the nuclear reactor through the containment, wherein the primary coolant loop and the isolation condenser system are integral with the nuclear reactor inside containment;
• a plurality of isolation valves connecting the primary coolant loop and the isolation condenser system to the nuclear reactor through the containment, and wherein each of the isolation valves is integral with the nuclear reactor;
• and
• a silo surrounding the containment and the isolation condenser system, wherein the silo is a seismic structure configured to reduce seismic shocks to the containment, the isolation condenser system, and the nuclear reactor.