Extended Mechanical Testing of RPV Surveillance Materials Using Reconstitution Technique for Small Sized Specimen to Assist Long Term Operation

J. May, J. Rouden, P. Efsing, M. Valo, H. Hein

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

For the Ringhals 3 and 4 pressurized water reactors (PWR) reactor pressure vessels (RPV), results from the irradiation surveillance program are available also for neutron fluences, which cover long-term operation (LTO). These standard surveillance results are based on the RTNDT concept. The belt-line welds of both RPVs have an elevated nickel-content of 1.6 wt. % and, as a consequence, irradiation response is higher than predicted by model equations. Therefore, the mechanical testing program has been expanded, exceeding the requirements of the standard testing program and covering both base and weld materials. To improve the understanding of the material behavior, extended Master Curve testing was performed on PCCV and subsize SE(B) specimens from irradiation surveillance capsules with the help of specimen reconstitution technique. Special care has been taken on the limited amount of weld material within the available broken Charpy halves before specimen reconstitution. Results have been compared to existing data on similar base and weld materials from the German research programs CARISMA and CARINA. Late-blooming effects or sudden saturation effects are not observed for base or weld materials under LTO conditions. The data for the four different weld materials of similar chemical composition indicate that not only the chemical composition, but also other influencing factors like, e.g., the welding heat treatment, may be important for the reference temperature of the unirradiated state as well as for the irradiation behavior. To investigate this effect in more detail, a future investigation program will be discussed including manufacturing of a surrogate weld material with the same chemical composition as in Ringhals 3 and 4 RPV. The influence of heat treatment condition can be investigated by applying different heat treatments and subsequently performing test reactor irradiation and mechanical testing. Specimen reconstitution will be required due to limited space inside the test reactor irradiation capsules.
Original languageEnglish
Title of host publicationSmall Specimen Test Techniques
PublisherAmerican Society for Testing and Materials ASTM
Number of pages22
Volume6
ISBN (Print)978-0-8031-7597-6
DOIs
Publication statusPublished - May 2015
MoE publication typeA4 Article in a conference publication
Event6th International Symposium on Small Specimen Test Techniques - Houston, United States
Duration: 29 Jan 201431 Jan 2014
Conference number: 6

Publication series

SeriesASTM Selected Technical Papers
Volume1576

Conference

Conference6th International Symposium on Small Specimen Test Techniques
CountryUnited States
CityHouston
Period29/01/1431/01/14

Keywords

  • fracture toughness
  • irradiation embrittlement
  • master curve
  • material testing
  • reactor pressure vessel
  • reconstitution technique
  • small sized specimens

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    May, J., Rouden, J., Efsing, P., Valo, M., & Hein, H. (2015). Extended Mechanical Testing of RPV Surveillance Materials Using Reconstitution Technique for Small Sized Specimen to Assist Long Term Operation. In Small Specimen Test Techniques (Vol. 6). American Society for Testing and Materials ASTM. ASTM Selected Technical Papers, Vol.. 1576 https://doi.org/10.1520/STP157620130189