Patent ID: 8254516
Filing Date: 2012-08-28
Classification: G21C,Y02E

Abstract:
1. A boiling water reactor control rod drive mechanism tool having an axial dimension, for removing an outer filter fitting around an upper portion of a control rod drive mechanism's index tube, the outer filter and the index tube defining an annulus there between, the boiling water reactor control rod drive mechanism tool for removing the outer filter comprising: an alignment sleeve member having a distal end configured to fit around the index tube and into the annulus defined by the index tube and the outer filter; a plurality of fingers respectively, pivotally supported at circumferentially, spaced, separate locations around the alignment sleeve, each finger having a distal end urged radially outwardly from an outer surface of the sleeve by a bias spring and a range of motion generally in the radial direction between an open and closed position with both open and closed positions being substantially, radially outside of the sleeve; and a collar axially movable over at least a portion of the fingers for opposing the spring bias and urging the distal ends of the fingers towards the sleeve.