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EDF Adopts Upgrading Main Secondary System Penetration Welds With Robots

Power News - Published on Mon, 14 Oct 2019

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EDF has adopted a scenario for upgrading the main secondary system penetration welds with robots and has adjusted the construction schedule and estimated cost accordingly. Based on this penetration weld repair strategy, the EDF Board of Directors approved continuation of the Flamanville EPR construction at a meeting held on the 8th of October 2019. Within this context, the Group has had to adjust the schedule and the estimated construction cost for Flamanville EPR accordingly.

In the letter of 19 June 2019, the Nuclear Safety Authority asked EDF to repair the eight containment penetration welds for Flamanville EPR, not compliant with the break preclusion principle. Within this framework, EDF has assessed three repair scenarios. This work resulted in discussions with the ASN, who sent EDF a letter on 4 October concerning technical feasibility of these three scenarios. The penetration weld rework scenario preferred by EDF is the use of remote-operated robots, designed to conduct high precision operations inside the piping concerned. This technology has been developed for nuclear power plants in operation and shall be qualified for penetration weld rework. The aim is to qualify this scenario with validation by the ASN by the end of 2020, date on which EDF will be able to initiate the repair works. The second scenario, based on extraction and realignment works in the Safeguard Auxiliary Buildings, is kept at this stage as a fall-back solution.

The process of realignment of the 58 welds on the secondary system with quality deviations or not in compliance with the break preclusion principle requirements defined by EDF is being continued on site.

At the same time, the second hot functional test phase was started on 21 September 2019 and will last until the end of 2019. These tests are performed on the plant in normal operating conditions.

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Posted By : Rabi Wangkhem on Mon, 14 Oct 2019
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