By International Atomic Energy Agency
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Additional resources for Heavy component replacement in nuclear power plants : experience and guidelines
As much as the experience feedback is known, the welding is performed manually by qualified welders. It should be noted that the thickness graduation from the SG nozzle to the pipe edge may require a large number of ‘finishing’ layers in order to allow a smooth external design and allow NDE. In spite of the confidence of the welding companies regarding their process and welders’ capabilities, it may be beneficial to perform intermediary NDE (20, 50 and 75% of the weld thickness) within the welding procedure to avoid heavy repairs afterwards.
In addition, the properties of the concrete in the opening are more critical due to the effects of shrinkage and creep on long term tendon forces. The post-tensioning tendons removed from the opening area are often replaced and this material has a long lead time. The sequence of replacing the liner plate, splicing rebar, installing tendon ducts, installing forms for the concrete, placing and curing the concrete and tensioning the tendons is, typically, the critical path for the project and plant outage.
Machine the nozzles and pipe ends according to the designed profile and the recorded topometry. The machining requires specific tooling. The main suppliers of SGR have developed this type of tooling. The procedure involves: • • • • Movement of the pipe ends to the selected position using the fix-up device. Installation the pipe spool pieces (closer). Release of the fix-up device. Preheating of the weld edges according to codes, in regard to the steel normalization, as per the welding procedure, which has been prepared accordingly and should be approved by the utility engineering department, as well as by the safety authorities and QA/QC representatives.
Heavy component replacement in nuclear power plants : experience and guidelines by International Atomic Energy Agency