Reactor and fuel assembly design for improved fuel utilization i

Details Reactor and fuel assembly design for improved fuel utilization i Reactor and fuel assembly design for improved fuel utilization i

1977-11-01

1981-03-10

Walsh, Donald P.

176 21, 176 30, G21C 700, G21C 730, G21C 1920

Patent

active

042552362

ABSTRACT:
An improved reactor and fuel assembly design is disclosed wherein a light water reactor is initially run with undermoderated fuel assemblies to take advantage of increased conversion ratio, and after a suitable period of operation, the neutron spectrum for the undermoderated assemblies is shifted to lower energies to increase reactivity by withdrawing a number of fuel rods from the assemblies. The increased reactivity allows for continued operation of the modified assembly, and the fuel rods which are removed are used to construct similar assemblies which are also capable of continued operation. The improved reactor and fuel assembly design results in improved fuel utilization and neutron economy and reduced control requirements for the reactor.

REFERENCES:
patent: 3070531 (1962-12-01), Huet
patent: 3081246 (1963-03-01), Edlund
patent: 3105036 (1963-09-01), Puechl
patent: 3141827 (1964-07-01), Iskenderian
patent: 3142624 (1964-07-01), Edlund
patent: 3180799 (1965-04-01), Blake
patent: 3801443 (1974-04-01), Yasukawa
patent: 3928128 (1975-12-01), Kollmar

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