CPC G21C 13/036 (2013.01) [G21C 19/20 (2013.01); G21C 3/3206 (2013.01); G21C 3/326 (2013.01); G21C 7/10 (2013.01)] | 20 Claims |
1. A method for installing an extension tube in a nuclear reactor comprising a control rod drive mechanism (CRDM) housing with a threaded head penetration nozzle and a thermal sleeve disposed therein, the method comprising:
removing the thermal sleeve from the threaded head penetration nozzle;
installing the extension tube in lieu of a replacement thermal sleeve, wherein the installing comprises:
aligning the extension tube with a threaded end of the threaded head penetration nozzle, the extension tube comprising a threaded end and non-threaded end, the threaded end sized and configured to threadably couple to the threaded head penetration nozzle;
threading the threaded end of the extension tube to the threaded end of the threaded head penetration nozzle;
torqueing the extension tube to the threaded end of the threaded head penetration nozzle;
gauging the alignment of the extension tube relative to the threaded head penetration nozzle; and
installing retention fillet welds between the extension tube and the threaded end of the threaded head penetration nozzle; and
installing a guide funnel to the non-threaded end of the extension tube.
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