Withdrawal of fuel rod

Abstract

Abstract PURPOSE:To enable an easier withdrawal of fuel rod, by giving an impact energy by a spring or pneumatic pressure directly to a lower end plug of a fuel rod and by lifting up the fuel rod upwardly to push the fuel rod up from its lower most part and to release it from sticking with other parts. CONSTITUTION:By moving and setting a fuel assembly to and in a fuel channel handling machine 11, by setting previously an angle of a nail 15 of a pneumatic driven fuel rod withdrawal jig 14 at a corresponding position of a fuel rod to be withdrawn, by lifting the jig 14 by jibcrane and by attaching setting guide 16 to a lower receiving table 12 of the machine 11, the nail 15 can be set to a lower part of a lower end plug of fuel rod to be withdrawn. Consequently, air from a baby compressor 17 is led to a piston 20 of a cylinder, a notch 21 is lifted up by an energy of a spring 23 with decoupling of the notch 21 and a movement of the notch 21 is transferred to a rod 24 as an impact energy and finally the nail 15 pushes up the lower end plug of the fuel rod. The lifted-up fuel rod is grasped by a rod grapple and the rod is withdrawn from the fuel assembly with the descending channel handling machine 11 after removal of the withdrawal jig.

Inventors

• 👤 Toru Seya
• 👤 Kensuke Tokunaga
• 👤 Fumihiro Goto
• 👤 Satoshi Seya

Bibliographic Details