초록 ▼

A core construction of a boiling-water nuclear reactor including an array of fuel assemblies and control rods wherein the fuel assemblies are each divided into two sections or upper and lower sections in the vicinity of the center of the length thereof and each lower section has a smaller mean infin

A core construction of a boiling-water nuclear reactor including an array of fuel assemblies and control rods wherein the fuel assemblies are each divided into two sections or upper and lower sections in the vicinity of the center of the length thereof and each lower section has a smaller mean infinite multiplication factor than each upper section. Of the fuel assemblies, those fuel assemblies which are located adjacent the control rods selected for power control each have a smaller overall means infinite multiplication factor than those fuel assemblies which are located adjacent the control rods other than the selected control rods.

대표청구항 ▼

A core construction of a boiling-water nuclear reactor comprising an array of a plurality of fuel assemblies and a plurality of control rods, each fuel assembly including a plurality of fuel rods, and each control rod adapted to be inserted between selected ones of said fuel assemblies, wherein: (a)

A core construction of a boiling-water nuclear reactor comprising an array of a plurality of fuel assemblies and a plurality of control rods, each fuel assembly including a plurality of fuel rods, and each control rod adapted to be inserted between selected ones of said fuel assemblies, wherein: (a) each fuel assembly is divided into two sections substantially in the vicinity of the center of the length of each fuel assembly to form an upper section and a lower section, the lower section having a smaller mean infinite multiplication factor than the upper section; (b) said control rods include two groups of control rods, one group of control rods being reactor power adjusting control rods which are at least partially inserted in the core during normal power operation of th reactor for adjusting reactor power, and the other group of control rods being reactor shutdown control rods which remain fully withdrawn from the core during the normal power operation in preparation for shutting down the reactor and are inserted in the core for shutting down the reactor; and (c) each of said fuel assemblies located adjacent said reactor power adjusting control rods having an overall mean infinite multiplication factor smaller than the fuel assemblies located adjacent said reactor shutdown control rods when said reactor shutdown control rods are inserted in the core, each of said fuel assemblies located adjacent said reactor power adjusting control rods having a smaller overall mean uranium enrichment factor than each of said fuel assemblies located adjacent said reactor shutdown control rods, and wherein each of said fuel assemblies located adjacent said reactor power adjusting control rods has a mean uranium enrichment factor of about 1.1 Wt.% in the upper section thereof, a mean uranium enrichment factor of about 1.0 Wt.% in the lower section thereof, and an overall means uranium enrichment factor of about 1.1 Wt.%; and wherein each of said fuel assemblies located adjacent said reactor shutdown control rods has a mean uranium enrichment factor of about 2.2 Wt.% in the upper section thereof, a mean uranium enrichment factor or about 2.0 Wt.% in the lower section thereof, and an overall means uranium enrichment factor of about 2.1 Wt.%.