11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Toronto, ON Canada
Session Title:
Condition Assessment, Life Assessment and Refurbishment

R. Sainz (Nucleoelectrica, Argentina)
G. Diaz (NA-SA)
P. Salvetti (NA-SA)
T. Freeman (SNC-Lavalin Nuclear Inc.)


Following several years of detailed planning and preparation, the Embalse NPP (Córdoba Province, Argentina), was shut down on December 31, 2015 to embark on the execution phase of the Life Extension Project. Candu Energy engineering, tools and procedures previously used and successfully proven are being used to execute the retubing work. With this being the third CANDU6 retubing campaign, the processes and tooling have been further refined to minimize the critical path duration. NASA is leading the execution of the work with on-site support from Candu Energy technical advisors. The unit has been successfully defueled, drained and dried and did not experience tritium issues during the subsequent removal activities. The reactor component removal activities and inspection activities were completed on schedule. During the removal series, all irradiated reactor components removed were stored in on-site waste storage facilities, and permanent components were found to be in good condition for extended operation. The installation phase is underway starting with the calandria tube installation and there have been no major issues thus far. This paper will provide an overview of the Embalse retubing activities, with particular emphasis on improvements developed and in some cases already executed, demonstrating how advancements in retubing techniques continue to be realized. The paper will also include a reference to some others important refurbishment activities like a DCC computer replacement, turbine refurb and replacement including uprating, diesel generators replacement, and moderator heat exchanger replacement, safety systems modifications, among others.

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