Control rod for boiling water reactor

摘要

A control rod for a boiling water reactor is provided with a structure element having mutually-perpendicular four blades. The four blades have a neutron absorber-filling region that neutron absorber is held, respectively. In the structure element, a plurality of regions formed in an axial direction of the control rod include a first region having a first cross-section that forms a first united cruciform cross-section of the four blades connected one another, a second region having a second cross-section that has each separated cross-section of the four blades, and a third region having a third cross-section that has a second united cross-section of continuous two blades of the four blades, disposed in a diametrically opposite direction and facing each other and each separated cross-section of remaining two blades of the four blades, disposed perpendicularly to the continuous two blades.

主权项

1. A control rod for a boiling water reactor comprising:
a structure element; a handle mounted to an upper end potion of the structural element; and a lower support member mounted to a lower end portion of the structure element; wherein the structure element includes four blades having a neutron absorber-filling region in which neutron absorber is held, respectively, and the four blades are disposed perpendicularly to one another; wherein the structure element has a plurality of regions formed in an axial direction of the control rod, the plurality of regions including a first region having a first cross-section that forms a first united cruciform cross-section of the four blades connected to one another, a second region having a second cross-section that has each separated cross-section of the four blades, and a third region having a third cross-section that has a second united cross-section of continuous two blades, which are disposed in a diametrically opposite direction of the four blades, and each separated cross-section of remaining two blades, which are disposed in a diametrically opposite direction and disposed perpendicularly to the continuous two blades, of the four blades; wherein the first region is formed in a first end portion of a handle side of the structure element and a second end portion of a lower support member side of the structure element, respectively; wherein the third region is formed between the first region formed in the first end portion and another first region formed in the second end portion; and wherein the second region is formed between the first region formed in the first end portion and another first region formed in the second end portion exclusive of the third region.