Induced nuclear reactions: processes – systems – and elements – Reactor structures – With particular control rod guide structure
Patent
1987-05-15
1988-08-30
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Reactor structures
With particular control rod guide structure
376267, 376352, 376448, G21C 1500, G21C 700
Patent
active
047675950
ABSTRACT:
In a boiling water reactor (BWR) of the D-lattice type an improved apparatus and method for the mounting of a nuclear fuel assembly is disclosed. Specifically, a D-lattice nuclear fuel assembly is diagonally displaced at the top and diagonally displaced at the bottom to and toward the cruciform shaped control rod interstices. Displacement at the bottom end of the nuclear fuel assembly occurs by an eccentrically centered lower tie plate and fluid inlet for fitting to the core plate at the bottom end of the assembly. Displacement at the top end of the nuclear fuel assembly occurs by shims in the vicinity of the upper end of the channel at the top guides. The disclosed channel assembly is capable of installation during refueling cycles, with a displaced channel being substituted for prior art conventional D-lattice channels. Substitution of one displaced channel occurs with each refueling cycle in a group of four channels. Consequently, there results at the end a maximum of four refueling cycles, complete installation of the displaced channels. As substitution occurs, there results an improved worth of each fuel channel assembly enabling an eventual aggregate 2% increase in life with resultant savings.
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Colby Mark J.
Elkins Robert B.
Wolters, Jr. Richard A.
Behrend Harvey E.
General Electric Company
Schroeder Robert R.
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