Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Emergency core coolant systems
Patent
1989-11-27
1991-04-09
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Emergency core coolant systems
376281, 376287, 376298, 376299, 376307, 376905, G21C 1518
Patent
active
050063030
ABSTRACT:
An improved emergency cooling system is provided for an organic cooled and moderated nuclear reactor. The cooling system permits an inherently safe reactor design to be achieved having a number of other novel and significant advantages. Most importantly, the reactor can be designed to survive a largest credible accident which involves the loss of the entire primary coolant inventory, while continuing to provide core cooling in a passive mode for a period of one or more days post-accident. The invention utilizes a combination of integers and parameters never previously contemplated in combination, namely a large store of emergency coolant, several times the volume of the primary coolant inventory, stored in accumulators at an overpressure above the saturated vapor pressure of the primary coolant and moderator at the reactor normal operating temperature, coupled with the use of an emergency coolant having a higher boiling point than that of the primary coolant and moderator, coupled with the use of a two-stage core coolant-to-intermediate coolant-to-atmospheric air heat rejection circuit for the core post-accident, of which each of the two stages is a natural convection circuit.
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