Construction in a reactorSystem used to initiate, maintain and control a fission chai... to collect and cool the molten reactorSystem used to initiate, maintain and control a fission chai... corePart of the nuclear reactor where the fission chain reaction.... The reactorSystem used to initiate, maintain and control a fission chai... pit is designed to collect the liquid molten metal mass generated during a core meltdownIf the reactor core cooling fails, e.g. due to a major leaka... accidentUnplanned sequence of events which may result in an effectiv... and guided by gravity to a lower-level area made of refractory material over which the molten mass spreads and the energyAbility to do work or diffuse heat. The unit of energy is th... contained in it can be removed by cooling and the molten mass solidifies.