Inspection & Repair at Gravelines 1

Speaker:
Quirk, K.; Westinghouse Electric Company and WesDyne; Sweden

Authors:
Paillaries, C.; Westinghouse Electric Company and WesDyne; Sweden
Jeanblanc, A.; Westinghouse Electric Company and WesDyne; Sweden
Bolander, M.; WesDyne; Sweden
Quirk, K.; Westinghouse Electric Company and WesDyne; Sweden

ID: ECNDT-0042-2018
Download: PDF
Session: Nuclear Industry 2
Room: H2
Date: 2018-06-13
Time: 14:30 - 14:50

In December 2011, an unacceptable indication was detected in a Bottom Mounted Instrumentation (BMI) penetration in the reactor vessel at EDF Gravelines Unit 1 in France.

WesDyne & Westinghouse was awarded a contract in March 2013 to develop, qualify and implement a first of a kind inspection & repair of the BMI. This repair involved removing the BMI and installing a plug from the inside of the reactor vessel. WesDyne & Westinghouse assembled a team with expertise in reactor vessel design, welding, machining, non-destructive testing, 3D scanning and sealing. The repair was completed in November 2016 over a 50 day period.

The removal of the BMI, the machining and welding activities for installing the permanent plug, as well as volumetric and surface examinations, were performed remotely from the refueling floor using a 20m deep coffer dam, inserted into the flooded reactor cavity. The team addressed multiple technical challenges such as design, welding and remote automated tooling, in a very constrained environment. Twenty different tools were developed including ones for automated PT, UT and dimensional measurements.