A new direction in PWR simplification

A new approach to PWR simplification is presented, in which a compact Reactor Coolant System (RCS) configuration introduced, particularly suited for power level the range of 600 MWe. Customary primary system components are eliminated achieve this RCS simplification. For example, pressure control through “self-pressurization” mode, with core exit at saturation temperature less than 1% steam, allows elimination pressurizer. Also, mechanical rods replaced by reactivity using negative moderator void and coefficient together variable speed pumps, an upgrade safety boration function. Decay heat removal shutdown conditions realized secondary side rather equipment. The can be installed small volume, high-pressure containment. containment divided into two leak-tight zones separated partition plate. Safety equipment one will protected against adverse ambient from leaks or breaks other zone. facilitates management coolant inventory within following breaks. In particular, injection as commonly known, consisting accumulators multiple stages pumps discarded gravity-driven flooding tanks. Space available around major adequate avoid compromising accessibility during maintenance in-service inspection operations. addition, two-zone, provides extra margins severe accident mitigation. Finally, proposed has much smaller size customary large dry containments practice it anticipated that Nuclear Island building similarly reduced.