Pressurizer heater sleeve.

摘要

A replacement heater sleeve for a nuclear reactor coolant system pressurizer can be provided to replace a damaged original heater nozzle. The original heater and heater nozzle are removed from the pressurizer and the original bore is enlarged. An outer sleeve (22) is installed in the enlarged bore on the same centre as the original heater nozzle and has its inner and substantially flush with the interior wall of the pressurizer. The outer sleeve (22) is welded (32, 30) to the pressurizer (10) at its interior and exterior surfaces. An inner sleeve (24) is installed in the outer sleeve (22) and extends beyond the inner end of the outer sleeve (22) into the pressurizer (10). The inner sleeve (24) is welded (36) to the outer end of the outer sleeve (22) and is provided with an inner diameter sized to receive a heater (38,40) of the same size as that originally installed in the pressurizer. The inner sleeve (24) also maintains the original heater alignment in the pressurizer (10).