TY - CHAP
T1 - Embrittlement Trend Curves and Reactor Pressure Vessel Operation in Finland
AU - Seppänen, Tommi
AU - Lindqvist, Sebastian
AU - Arffman, Pentti
AU - Lappalainen, Petteri
N1 - Funding Information:
This research is part of the Advanced Materials Characterization for Structural Integrity (AMOS) project that is funded through SAFIR2022 (the Finnish Research Programme on Nuclear Power Plant Safety 2019–2022).
Publisher Copyright:
Copyright © 2023 by ASTM International.
PY - 2023/6/1
Y1 - 2023/6/1
N2 - To evaluate embrittlement from neutron irradiation, Finnish regulations have required the use of surveillance programs in light water reactors since the 1970s. These are applied in the five operating reactors: two VVER-440s at Loviisa (LO1 and LO2), two boiling water reactors, and one EPR at Olkiluoto (OL1, OL2, and OL3). The same requirements apply to the power plants in the licensing phase (e.g., FH1). In Finland the embrittlement trend curves are experimentally quantified with the use of the master curve or qualitatively using impact toughness. The application of the master curve has been a particular success for the operating VVER-440 reactors. In new builds, lessons learned from the past are applied to ensure that the degree of embrittlement remains low. Several decades of domestic research programs have aimed at and continue to develop methods for the improved application of fracture mechanics for RPVs.
AB - To evaluate embrittlement from neutron irradiation, Finnish regulations have required the use of surveillance programs in light water reactors since the 1970s. These are applied in the five operating reactors: two VVER-440s at Loviisa (LO1 and LO2), two boiling water reactors, and one EPR at Olkiluoto (OL1, OL2, and OL3). The same requirements apply to the power plants in the licensing phase (e.g., FH1). In Finland the embrittlement trend curves are experimentally quantified with the use of the master curve or qualitatively using impact toughness. The application of the master curve has been a particular success for the operating VVER-440 reactors. In new builds, lessons learned from the past are applied to ensure that the degree of embrittlement remains low. Several decades of domestic research programs have aimed at and continue to develop methods for the improved application of fracture mechanics for RPVs.
KW - master curve
KW - irradiation embrittlement
KW - fracture toughness
KW - embrittlement trend curves
UR - https://www.scopus.com/pages/publications/85166980501
U2 - 10.1520/STP164720220038
DO - 10.1520/STP164720220038
M3 - Chapter or book article
T3 - ASTM Special Technical Publication
SP - 259
EP - 283
BT - Radiation Embrittlement Trend Curves and Equations and Their Use for RPV Integrity Evaluations
A2 - Server, William L.
A2 - Brumovský, Milan
A2 - Kirk, Mark
PB - American Society for Testing and Materials (ASTM)
T2 - ASTM Symposium on Radiation Embrittlement Trend Curves/Equations and Their Use for RPV Integrity Evaluations
Y2 - 19 April 2023 through 22 April 2023
ER -