Qualification of Tecnatom's ISI Systems for Reactor Pressure Vessel Areas of Barsebäck 1 and 2 and Oskarshamn 2 NPPs; (Project RTID)
G. Bollini, Tecnatom, Spain; C. Denker, Barsebäck NPP, Sweden
ABSTRACT
In July 1999, the team Tecnatom-GE was awarded with a contract to qualify several In-Service inspection systems (mechanised equipment, inspection procedures and personnel) for different areas of the Reactor Pressure Vessels, and to perform the In-Service Inspection of Barsebäck Unit 1 in year 2001, Barsebäck 2 in year 2003 and Oskarshamn 2 in year 2005. The qualification will be performed under the requirements of the Swedish Qualification Centre (SQC) in 2001 and 2002. Previously to the SQC Qualification, practical demonstration on scanner's performance have to be carried out for the project RTID, through the Factory Acceptance Tests (FAT), as well as open practical demonstrations on inspection procedure's performance within the Procedure Acceptance Tests (PAT). The Reactor Pressure Vessel (RPV) areas included in the contract scope are:
RPV cover head: Circumferential and Longitudinal welds
RPV bottom dome: Circumferential and Longitudinal welds
Inlet-Outlet Main Circulation Nozzles: Nozzle to Shell welds, Nozzle Inner Radius and Nozzle to Pipe welds.
Due to the great variety of inspection areas configurations, a total of 8 inspection procedures will be qualified to be applied by 3 different mechanical scanners: WIND and DOME TRACKER from Tecnatom and by the 5 Station-Main Circulation scanner owned by the Swedish NPPs, together with the Ultrasonic Data Acquisition and Signal Processing System (DAS): SUMIAD/MIDAS/MASERA NT from Tecnatom. A total of 6 DAS operators and 8 DAS Analysts from Tecnatom and GE will be certified within the qualification process. Specification and manufacturing of flawed test specimens by RTID are part of the activities of the project to perform the open practical demonstration (PAT) for the inspection procedures. Additionally, a partially full scale mock-up of RPV cover head and bottom dome has been designed and manufactured by Tecnatom to perform the required FATs. Technical Justifications are required in the qualification process to provide additional evidences on the reliability of the inspection system (scanners, procedures and personnel), following the approach of the European Network for Inspection Qualification (ENIQ). Technical Justifications include theoretical calculations of measurement uncertainties of each inspection system, which are also presented to this conference in a separated paper. A detailed description of the above activities and inspection systems is provided in this paper.
Publication Source: 3nd International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components, November 14-16, 2001, Seville Spain. Publisher: Tecnatom s.a. - [Homepage]
