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CARINA: A program for experimental investigation of the irradiation behaviour of German Reactor Pressure Vessel materials
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0003-1498-5691
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2013 (English)In: ATW. Internationale Zeitschrift für Kernenergie, ISSN 1431-5254, Vol. 58, no 5Article in journal (Refereed) Published
Abstract [en]

The proof of a sufficient safety margin against brittle fracture of the reactor pressure vessel (RPV) is an important part of the operational safety of nuclear power plants. The RPV safety assessment procedure applicable in Germany is described in KTA 3201.2 of the Nuclear Safety Standard Commission (KTA). This deterministic assessment concept is based on the comparison of load curves with the material resistance curve in terms of fracture toughness. The fracture toughness curve can be determined either indirectly according to the RT-(NDT) concept based on Charpy tests or directly according to the more appropriate RTT0 approach based on Master Curve analysis of fracture toughness tests, respectively. In the recently completed research project CARINA the data base for pre-irradiated original RPV steels of German PWR construction lines was extended by comprehensive fracture toughness testing. The data obtained up to neutron fluences of 7.67 x 10(19) n/cm(2) (E > 1 MeV) are analysed and discussed particularly in terms of Master Curve applications. The experimental results show that optimized RPV manufacturing specifications and reactor designs are advantageous for a long-term plant operation in comparison to less optimized materials with lower toughness and to reactor designs with substantial higher neutron irradiation. With the obtained data, experiences and insights an essential contribution was also made to the integration of the Master Curve concept in German safety standards.

Place, publisher, year, edition, pages
2013. Vol. 58, no 5
Keyword [en]
Irradiation effects, fracture mechanical properties, Reactor pressure vessel, Master curve, Structural integrity
National Category
Applied Mechanics Other Materials Engineering
URN: urn:nbn:se:kth:diva-136329ISI: 000320093500005OAI: diva2:675812

QC 20140218

Available from: 2013-12-04 Created: 2013-12-04 Last updated: 2014-02-18Bibliographically approved

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