Control rod drive length measurement tool

Details Control rod drive length measurement tool Control rod drive length measurement tool

1994-04-18

1995-09-05

Fulton, Christopher W.

Geometrical instruments

Distance measuring

Single contact with a work engaging support

33502, 376258, G21C 17017, G01B 502

Patent

active

054469724

ABSTRACT:
A tool for checking the length of a control rod drive measured from the top of the control rod drive flange to the end of the uncoupling rod. The tool is a GO--NO--GO gauge with tight tolerance. The top of the tool supports a gage which has an arm that pivots about an axis parallel to the tool axis. The arm has a stepped notch with a predetermined height equal to the length tolerance range (e.g., 0.0625 inch). The length is considered acceptable when the gage is rotated and the first edge of the stepped notch on the arm just clears the end of the uncoupling rod but the second edge stops the gage from pivoting any further. The length is not acceptable if the first edge of the stepped notch on the arm abuts the uncoupling rod, preventing the gage from pivoting any further, or if the gage misses the uncoupling rod entirely.

REFERENCES:
patent: 3319395 (1967-05-01), Marconi
patent: 3475825 (1969-11-01), Creek et al.
patent: 3475826 (1969-11-01), De Hart et al.
patent: 3975828 (1976-08-01), Calcatema et al.
patent: 4048009 (1977-09-01), Weilbacher
patent: 5112566 (1992-05-01), Butzen et al.

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