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BREDA-RPV

 

Activity name BREDA-RPV - Barsebäck RPV trepan studies
Project summary

Irradiation induced ageing of the weld material of the reactor pressure vessel (RPV) is a limiting factor from a long-term operation perspective. The closed Barsebäck 2 reactor gives an opportunity to harvest samples from the RPV, which was manufactured and welded with the same technique and high amounts of nickel and manganese as most Nordic RPVs. A test program to analyze the as-aged material properties has been prepared within the NKS-R activity BREDA-RPV.

 

In 2016 base line testing was performed at VTT on un-irradiated material retrieved from the original testing of the reactor pressure vessel. In addition, a feasibility study on harvesting of material from the reactor pressure vessel at Barsebäck was presented in the end of 2016 as a collaboration between the present project group and Ringhals AB, who will act as contact point for the trepan extraction. The microstructural features of un-irradiated material was mapped for several specimens laying the foundation for continued studies on irradiated materials.

 

The activity in 2018 starts by studies of the mechanical properties of an accelerated surveillance capsule as well as material from a standard surveillance capsule from the RPV of Barsebäck 2. The main deliverable is a literature review on the feasibility to utilize specimens with high degree of constrain, i.e. very small test specimen, to study the effects of irradiation on the mechanical properties. This is a preparation for testing of material from the reactor pressure vessel itself, which will be available in the end of 2018. It further contains an enhanced microstructural evolution of RPV weld materials containing high levels of nickel and manganese to study the build-up of agglomerates that are in part responsible for irradiation hardening of these alloys. This study includes Light Optical, Scanning Electron, Transmission Electron and Atom Probe Microscopy at CTH and VTT. The issue is also relevant to the Finnish new-build project in Hanhikivi since the base metal in that RPV has a similar composition.

 

Lead organisation Royal Institute of Technology KTH, Sweden
Contact person Pål Efsing, efsing@kth.se, +46 706 254 514

 

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