Pressure suppression containment system

A pressure suppression containment system comprising:

• a reactor pressure vessel containing a reactor core therein submerged in reactor water, said core being effective for heating said reactor water to generate steam;
• a containment vessel spaced outwardly from said pressure vessel to define a drywell containing a non-condensable gas;
• an enclosed wetwell pool disposed in said containment vessel and partially filled with water to define a wetwell plenum thereabove, said wetwell pool having a drywell-to-wetwell vent disposed in flow communication with said drywell for venting from said drywell to said wetwell pool steam released into said drywell following a loss-of-coolant-accident (LOCA) along with said non-condensable gas carried therewith;
• a gravity driven cooling system (GDCS) pool disposed in said containment vessel at an elevation above said reactor core and said wetwell pool, and partially filled with water to define a GDCS plenum thereabove;
• means for selectively channeling by gravity said GDCS pool water into said pressure vessel following said LOCA;
• and
• means for venting said wetwell plenum to said GDCS plenum for channeling said non-condensable gas thereto.