National Geographic : 1991 Aug
The goals: simpler, safer, less costly PASSIVE WATER COOLED Replacing active safety systems with more reliable passive ones, the AP600 (right) would position tanks of water above the reactor core to flood it by gravity during an emergency. Sprin klers would cool the outside of the steel containment vessel. Prefab ricated modules could speed construction. DESIGN: Westinghouse FUEL:uranium dioxide COOLANT: pressurized water OPERATING TEMP: 600°F GENERATING CAPACITY: 600 MW WA E SUpPr MODULAR GAS COOLED The MHTGR (Modular High Temperature Gas-Cooled Reactor) would run on coated uranium pellets in em that is virtually meltdown roof. Us helium as a coolant, it couldpeate thigh temperatures, mak it r efficient. And it could the high ededfor indus a ce icoal gasification. Four ;dlar actors would be gr to er at each plant. eral Atomics ted uranium pellets NThelium IQUID-METAL COOLED RATING TEMP: 1268°F apable of breeding its own fuel, the ENERATING CAPACITY: 135 MW RISM (Power Reactor Innovative mall Module) could help uranium sup- AINTING BYPIERREMION lies last centuries longer. Its core could be submerged in liquid sodium Setal that can absorb large mounts of heat but must be pro ected from contact with air or water. line reactors would be grouped ogether at a single power plant. ESIGN: General Electric UEL:uranium/plutonium/zirconium OOLANT: liquid sodium PERATING TEMP: 905'F ENERATING CAPACITY: 155 MW m REACTOR CORE m COOLANT LOOP ] POWER-GENERATING LOOP MECHANICAL BACKUP SYSTEMS AIR DUCTS TO CARRY AWAY HEAT EARTH MECHANICAL CIRCULATION NATURAL CIRCULATION L t D F C 0 G "'