METHOD AND DEVICE FOR SHIELDING NUCLEAR FUEL ASSEMBLY EQUIPPED WITH DEBRIS SHIELD WHICH IS REMOVABLE IN UPPER TIE PLATE

摘要

<P>PROBLEM TO BE SOLVED: To provide a method and a device for shielding a nuclear fuel assembly equipped with a debris shield which is removable in an upper tie plate. Ž<P>SOLUTION: A method for cleaning or replacing a debris shield 102 in a fuel assembly, which is a method where the fuel assembly includes a bundle of fuel rods and fuel concentration parts of the rods are located below the upper tie plate and are housed in a channel, includes: a step of inserting the debris shield 102 into the upper tie plate; a step of holding the shield in the upper tie plate and above the fuel concentration parts of the fuel rods while the fuel assembly is located in an operating reactor core; a step of running coolant through the bundle and the debris shield 102 during the operation of the reactor core; a step of capturing or deviating with the debris shield 102 the debris flowing through the fuel assembly; a step of removing the fuel assembly from the reactor core; and a step of removing the debris shield 102 from the upper tie plate. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž