High-temperature reactors inherent safety features

This reactor, named LEADIR-PS, (an acronym for LEAD-cooled Integral Reactor, Passively Safe) incorporates the inherent safety features of the Modular High Temperature Gas Cooled Reactor (MHTGR), while avoiding the cost of reactor and steam generator pressure vessels, and the safety concerns regarding pressure vessel rupture. 

Several inherent and passive safety features are incorporated in compact high temperature reactor. Due to negative temperature coefficient of reactivity, the power of the reactor comes down without necessitating any external control in case of increase in core temperature. The reactor also adopts passive systems like removal of core heat by natural circulation of liquid metal coolant in the main heat transport circuit, passive regulation and shut down systems. The reactor is also able to remove heat passively by way of conduction in the reactor block and by radiation and natural convection from the outer surface of the reactor during loss of heat sink. The paper deals with the details of passive systems incorporated in the AHWR and CHTR and the analysis performed for these systems. 

Inherent safety properties. PFR possessed inherent safety features which would allow it to survive a range of very improbable incidents, even in the highly unlikely circumstances of failure of the engineering safeguards. The major inherent safety features were natural circulation (within the NaK filled decay heat rejection loops and of the primary sodium coolant) and the reactor s negative temperature and power coefficients. 

TECHNICAL OUTLINE OF A HIGH TEMPERATURE POOL REACTOR WITH INHERENT PASSIVE SAFETY FEATURES... 

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