Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Emergency core coolant systems
Patent
1990-10-10
1991-12-31
Hunt, Brooks H.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Emergency core coolant systems
376299, G21C 900
Patent
active
050769995
ABSTRACT:
A passive decay-heat removal system for a water-cooled nuclear reactor employs a closed heat transfer loop having heat-exchanging coils inside an open-topped, insulated box located inside the reactor vessel, below its normal water level, in communication with a condenser located outside of containment and exposed to the atmosphere. The heat transfer loop is located such that the evaporator is in a position where, when the water level drops in the reactor, it will become exposed to steam. Vapor produced in the evaporator passes upward to the condenser above the normal water level. In operation, condensation in the condenser removes heat from the system, and the condensed liquid is returned to the evaporator. The system is disposed such that during normal reactor operations where the water level is at its usual position, very little heat will be removed from the system, but during emergency, low water level conditions, substantial amounts of decay heat will be removed.
REFERENCES:
patent: H119 (1986-09-01), Keeton et al.
patent: 3702281 (1972-11-01), Birts et al.
patent: 4587079 (1986-05-01), Fajeau et al.
patent: 4666661 (1987-05-01), Fredell et al.
patent: 4812286 (1989-03-01), Gluntz
Constant Richard E.
Hamel Stephen D.
Hunt Brooks H.
Moser William R.
The United States of America as represented by the United States
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