Nuclear reactor having an ascending cooling path much greater th

Details Nuclear reactor having an ascending cooling path much greater th Nuclear reactor having an ascending cooling path much greater th

1988-12-14

1991-06-11

Hunt, Brooks H.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Circulating fluid within reactor

376210, 376221, 376236, 376361, 376443, 376444, G21C 1500

Patent

active

050230476

ABSTRACT:
A fuel assembly has a water rod which consists of a coolant ascending path and a coolant descending path, the coolant ascending path opening below a fuel support of a lower tie plate, the coolant descending path opening above the fuel support and adapted to guide downwardly the coolant that has flowed up the coolant ascending path to the upper portion of the water rod. The lateral cross section of the coolant ascending path is more than 25 times that of the coolant descending path.
The nuclear reactor with these fuel assemblies loaded in the core is operated as follows. After startup of the reactor when the reactor power is low, all the control rods inserted in the core are withdrawn completely. Then, the reactor power is controlled by regulating a liquid level formed in the water rods. This reactor operation method prolongs the lifetime of the control rods, thereby reducing the number of times they have to be replaced.

REFERENCES:
patent: 3528885 (1986-05-01), Kumpf
patent: 4708846 (1987-11-01), Patterson et al.
patent: 4803044 (1989-02-01), Patterson

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